Installation, Operating and Service Instructions for K2WT TM Residential Condensing High Efficiency Direct Vent Gas-Fired Water Boiler 9700609 As an ENERGY STAR® Partner, U.S. Boiler Company has determined that the K2WT™ Series meets the ENERGY STAR® guidelines for energy efficiency established by the United States Environmental Protection Agency (EPA). TO THE INSTALLER: Affix these instructions adjacent to boiler. TO THE CONSUMER: Retain these instructions for future reference.
IMPORTANT INFORMATION - READ CAREFULLY NOTE: The equipment shall be installed in accordance with those installation regulations enforced in the area where the installation is to be made. These regulations shall be carefully followed in all cases. Authorities having jurisdiction shall be consulted before installations are made. All wiring on boilers installed in the USA shall be made in accordance with the National Electrical Code and/or local regulations.
WARNING Asphyxiation Hazard. Fire Hazard. Explosion Hazard. This boiler requires regular maintenance and service to operate safely. Follow the instructions contained in this manual. • Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Read and understand the entire manual before attempting installation, start-up operation, or service.
WARNINGS FOR THE HOMEOWNER FOLLOW ALL INSTRUCTIONS and warnings printed in this manual and posted on the boiler. INSPECT THE BOILER ANNUALLY. To keep your boiler safe and efficient, have a service technician follow the Service checklist near the end of this manual. IF YOU ARE NOT QUALIFIED to install or service boilers, do not install or service this one. THE BOILER MAY LEAK WATER at the end of its useful life. Be sure to protect walls, carpets, and valuables from water that could leak from the boiler.
Table of Contents I. II. III. IV. V. VI. VII. VIII. IX. X. XI. XII. XIII. XIV. XV. Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Before Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Locating The Boiler. . . . . . . . . . . . . . . . .
I. Product Description This boiler is a stainless steel gas fired condensing boiler designed for use in forced hot water heating systems requiring supply water temperatures of 180°F or less. This boiler may be vented vertically or horizontally with combustion air supplied from outdoors. It is not designed for use in gravity hot water systems or systems containing significant amounts of dissolved oxygen. II. Specifications SEE TABLE 2.
II. Specifications (continued) Table 2.2: Specifications Model* D.O.E. Maximum Minimum AHRI Net Water Heating Input Input Rating * Volume Capacity (MBH) (MBH) (MBH) (gal.) (MBH) Dim. “A” Supply & Return Connection Size (NPT) Approx. Altitude Range (ft) Gas Net Connection Weight Size (NPT) NG LP (lb.) K2WT-080B 80 8 74 64 0.430 17” 1” 1/2” 100 K2WT-100B 100 10 94 82 0.547 17” 1” 1/2” 102 0-10100 0-2000 0-10100 K2WT-120B 120 12 112 97 0.
III. Before Installing (continued) 4. All boilers are shipped from the factory configured for use with natural gas. They may be converted for use with LP gas (“propane”) using a proper conversion kit per Table 3.1. Use a combustion analyzer and follow all instructions supplied with conversion kit. Table 3.1: LP Conversion Kits WARNING conversion kit.
IV. Locating the Boiler (continued) *LEFT SIDE CLEARANCE MAY BE REDUCED TO 1/2" HOWEVER RELIEF VALVE MUST REMAIN IN SAME SPACE AS BOILER. Figure 4.
V. Mounting The Boiler A. Wall Mounting CAUTION • • This boiler weighs as much as 119 pounds: Two people are required to safely lift this boiler onto the wall mounting hook. Make sure that wall mounting hook is anchored to a structure capable of supporting the weight of the boiler and attached piping when filled with water. Jurisdictions in areas subject to earthquakes may have special requirements for supporting this boiler. These local requirements take precedence over the requirements shown below.
V. Mounting The Boiler (continued) Figure 5.
V. Mounting The Boiler (continued) Figure 5.
VI . Air for Ventilation WARNING Outdoor combustion air must be piped to the air intake. Never pipe combustion air from areas containing contaminates such as swimming pools and laundry room exhaust vents. Contaminated combustion air will damage the boiler and may cause property damage, personal injury or loss of life. Air for combustion must always be obtained directly from outdoors. See Section VII for intake piping.
VII. Venting WARNING Asphyxiation Hazard. Failure to vent this boiler in accordance with these instructions could cause products of combustion to enter the building resulting in severe property damage, personal injury or death. • Do not interchange vent systems or materials unless otherwise specified. • The use of thermal insulation covering vent pipe and fittings is prohibited. • Do not use a barometric damper, draft hood or vent damper with this boiler.
VII. Venting A. Vent System Design (continued) Figure 7.0a: Horizontal Twin Pipe Figure 7.0b: Vertical Twin Pipe Figure 7.
VII. Venting A. Vent System Design (continued) • DuraVent PolyPro - ULC S636 listed Polypropylene special gas vent system. • Selkirk Polyflue - ULC S636 listed Polypropylene special gas vent system. • Centrotherm InnoFlue SW - ULC S636 listed Polypropylene special gas vent system. • DuraVent FasNSeal Flex - UL 1738 listed Stainless Steel special gas vent system. Use PVC and/or CPVC for the air intake system. PVC may be used for all air intake piping between the intake terminal and the boiler.
VII. Venting A. Vent System Design (continued) NOTICE Do not exceed maximum vent/combustion air system length. Refer to Tables 7.1B, 7.5, 7.13, and 7.21 in this section for maximum vent/combustion air system length. Use Use only vent and combustion air terminals and terminal locations shown in Tables 7.1B, 7.5, 7.13 and 7.21. 4. Minimum Vent and Air Intake Lengths - Observe the minimum vent lengths shown in Tables 7.5, 7.13 and 7.21. 5.
VII. Venting A. Vent System Design (continued) 7. Supporting Pipe - Vertical and horizontal sections of pipe must be properly supported. Maximum support spacing is as follows: • Support CPVC/PVC horizontally and vertically every 4 feet. • Support DuraVent PolyPro horizontally near the female end of each straight section of pipe and vertically every 10 feet. • Support Centrotherm InnoFlue horizontally every 39 inches with additional supports at elbows and vertically every 78”.
VII. Venting A. Vent System Design (continued) Figure 7.3a Figure 7.3b Figure 7.3c Figure 7.3: Expansion Loops for CPVC/PVC Pipe Figure 7.
VII. Venting B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued) B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems Table 7.5 summarizes all horizontal twin pipe vent options. Illustrations of horizontal twin pipe vent systems are shown in Figures 7.6 – 7.10. In addition to the requirements in Section VII - A, observe the following design requirements: 1.
VII. Venting B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued) Table 7.5: Summary of Horizontal Twin Pipe Venting Options Vent Option Illustrated in Figure Pipe Vent Penetration through Intake Structure Material Vent Intake Vent Nominal Diameter Intake Min Equivalent Vent Length: 080 100 120 Models 150 1 2 3 4 5 6 7 8 7.6, 7.7, 7.8 7.6, 7.7, 7.8 7.9, 7.10 7.9, 7.10 7.9 7.9 7.9 7.
VII. Venting B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued) 2. Horizontal Vent and Air Intake Terminal Location - Observe the following limitations on the vent terminal location (also see Figure 7.11). When locating a concentric terminal, observe the limitations outlined below for “vent terminals”. • Vent terminal must be at least 1 foot from any door, window, or gravity inlet into the building.
VII. Venting B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued) CPVC VENT PIPE (FIRST 30" + ELBOW) PVC VENT PIPE PITCH VENT PIPE 1/4" PER FOOT TOWARDS BOILER PVC AIR INTAKE PIPE ALTERNATE ORIENTATION PITCH INTAKE AWAY FROM BOILER IF POSSIBLE BUILDING EXTERIOR BOILER ROOM Figure 7.
VII. Venting B. Design Requirements Unique to Horizontal Twin Pipe Venting Systems (continued) Figure 7.9: Duravent PolyPro, Selkirk, Polyflue or Centrotherm InnoFlue Horizontal Venting (Vent Option #3 - 8, Terminal Option A) PITCH VENT PIPE 5/8" PER FOOT TOWARDS BOILER PVC AIR INTAKE PIPE PITCH INTAKE AWAY FROM BOILER IF POSSIBLE 2" OR 3" DURAVENT POLYPRO VENT PIPE BUILDING EXTERIOR BOILER ROOM Figure 7.
107672-03 - 5/18 Figure 7.11: Location of Vent Terminal Relative to Windows, Doors, Grades, Overhangs, Meters and Forced Air Inlets - Two-Pipe System Vent Terminal (Shown) Two-Pipe System Air Intake Terminal (Not Shown) Note: Air intake termination not shown. VII. Venting B.
VII. Venting C. Design Requirements Unique to Vertical Venting Systems (continued) Figure 7.12: Snorkel Terminal Configuration (CPVC/PVC Vent Systems Only) C. Design Requirements Unique to Vertical Venting Systems Table 7.13a summarizes all vertical twin pipe vent options. Table 7.13.b summarizes vent options in which an abandoned B-vent chimney is used both as a chase for the vent pipe and as a conduit for combustion air.
VII. Venting C. Design Requirements Unique to Vertical Venting Systems (continued) Table 7.13a: Summary of Vertical Twin Pipe Venting Options Option 10 11 12 13 14 15 16 17 7.15, 717 7.15, 7.17 7.17, 7.18 7.17, 7.18 7.17 7.17 7.17 7.
VII. Venting C. Design Requirements Unique to Vertical Venting Systems (continued) Table 7.13b: Summary of Vertical “B-Vent Air Chase” Vent Options (B-Vent Chase MUST Be Sealed) Option 18 19 20 21 7.19 7.19 7.20 7.
VII. Venting C. Design Requirements Unique to Vertical Venting Systems (continued) Terminal Option J: DiversiTech Concentric Terminal (Acceptable for Vent Options 10 & 11) - This terminal is shown in Figure 7.16 and may be used with CPVC/PVC vent systems. See Section VII - E of this manual and the DiversiTech instructions provided with the terminal, for installation details. Terminal Option K: DuraVent PolyPro Concentric Terminal (Acceptable for Vent Options 12, 13) - This terminal is shown in Figure 7.
VII. Venting C. Design Requirements Unique to Vertical Venting Systems (continued) Table 7.14: Equivalent Length of Flex Pipe Equivalent Length (ft) Flex Vent (1 ft): 2” DuraVent PolyPro Flex 2.0 ft 2” Centrotherm InnoFlue Flex 2.0 ft 2” Selkirk Polyflue 2.0 ft 3” DuraVent PolyPro Flex 2.0 ft 3” Centrotherm InnoFlue Flex 2.3 ft 3” Selkirk Polyflue 2.3 ft 3” Duravent FasNSeal Flex 1.0 ft 2” Flex Vent in 5” (or larger) B-Vent 1.0 ft 3” Flex Vent in 6” (or larger) B-Vent 1.
VII. Venting C. Design Requirements Unique to Vertical Venting Systems (continued) Figure 7.15: Vertical CPVC/PVC Venting (Vent Options 10 & 11, Terminal Option H) Figure 7.
VII. Venting C. Design Requirements Unique to Vertical Venting Systems (continued) Figure 7.17: Duravent PolyPro, Selkirk Polyflue or Centrotherm InnoFlue Vertical Single Wall PP Venting (Vent Options #12-17, Terminal Option H) Figure 7.
VII. Venting C. Design Requirements Unique to Vertical Venting Systems (continued) Figure 7.19: Duravent PolyPro B-Vent Air Chase System (Vent Options #18 & 19) Figure 7.
VII. Venting D. Design Requirements Unique to Split Vent Systems (continued) D. Design Requirements Unique to Split Vent Systems Table 7.21 summarizes all split vent options. Illustrations of split vent systems are shown in Figures 7.22, 7.23, 7.24a and 7.25a. In addition to the requirements in Section VII - A, observe the following design requirements: 1.
VII. Venting D. Design Requirements Unique to Split Vent Systems (continued) Example: A 100MBH model is to be installed as using Vent Option 34 in a masonry chimney as shown in Figure 7.23.
VII. Venting D. Design Requirements Unique to Split Vent Systems (continued) Table 7.21: Summary of Split Vent System Options (cont.) Option # Illustrated in Figure Pipe Penetration Through Structure Material Nominal Diameter 25 26 27 28 29 30 7.22 7.22 7.22 7.22 7.22 7.
VII. Venting D. Design Requirements Unique to Split Vent Systems (continued) Table 7.21: Summary of Split Vent System Options (cont.) Option # 31 32 33 34 35 36 7.22 7.22 7.23, 7.24 7.23, 7.24 7.23, 7.24 7.23, 7.
VII. Venting D. Design Requirements Unique to Split Vent Systems (continued) Table 7.21: Summary of Split Vent System Options (cont.) Option # 37 38 39 7.23, 7.24 7.23, 7.24 7.
VII. Venting D. Design Requirements Unique to Split Vent Systems (continued) FIRE STOP LISTED FOR USE WITH VENT SYSTEM PITCH 1/4" PER FT TOWARDS TRAP PVC AIR INTAKE PIPE Figure 7.22: Split Rigid Vent System (Vent Options 25-32) PVC AIR INTAKE PIPE Figure 7.
VII. Venting D. Design Requirements Unique to Split Vent Systems (continued) EXHAUST NOTE: DURAVENT POLYPRO FLEX COMPONENTS SHOWN. PPs FLEX CLEAN, TIGHT UNUSED CHIMNEY DURAVENT POLYPRO VENT PIPE PVC AIR INTAKE PIPE OUTSIDE WALL PVC ELBOW WITH RODENT SCREEN 12" MIN BASE SUPPORT AND ELBOW FOR PPs FLEX PIPE EXTERIOR WALL PLATE BOILER NORMAL SNOW LINE ABOVE GROUND LEVEL 10" OR LESS Figure 7.
VII. Venting D. Design Requirements Unique to Split Vent Systems (continued) WITH CROWN 45° MAX BOILER CHIMNEY AND FOUNDATION ARE STRUCTURALLY SOUND WARNING Venting of Other Appliances (Or Fireplace) into Chase or Adjacent Flues Prohibited! BOILER Figure 7.
VII. Venting D. Design Requirements Unique to Split Vent Systems (continued) Figure 7.25a: Split Vent Systems (SS Flex in Abandoned Masonry Chimney) (Vent Option 39) WARNING Venting of Other Appliances (Or Fireplace) into Chase Prohibited! Figure 7.
VII. Venting E. Assembly of CPVC/PVC Vent Systems (continued) E. Assembly of CPVC/PVC Vent Systems WARNING Asphyxiation Hazard. Failure to follow these instructions could cause products of combustion to enter the building, resulting in severe property damage, personal injury or death. • Use all CPVC vent components for near-boiler vent piping before transitioning to Schedule 40 PVC pipe (ASTM 2665) components for remainder of vent system.
VII. Venting E. Assembly of CPVC/PVC Vent Systems (continued) Figure 7.27: Vent Connections and Flue Gas Sample Cap Location g. Assemble the rest of the vent system, being sure to pitch horizontal sections back towards the boiler 1/4”/ft. Support the vent at intervals not exceeding 4ft. h. Maintain the clearances from the vent pipe outlined in Section VII - A of this manual.
VII. Venting E. Assembly of CPVC/PVC Vent Systems (continued) Figure 7.28: Installation of Standard Horizontal Terminals Figure 7.29: Installation of Standard Vertical Terminals 4. Installation of Vertical Fitting Terminals (Terminal Option H): a. See Figure 7.29 for the proper orientation of twin pipe vertical terminals. b. The coupling is used to secure the rodent screen to the end of the vent pipe. c. A 180° bend (or two 90° elbows) are installed on the top of the air intake pipe.
VII. Venting E. Assembly of CPVC/PVC Vent Systems (continued) 5. Installation of IPEX low profile vent terminal (Terminal Option B) - See Figure 7.30: a. Cut two holes in wall to accommodate the size PVC pipe being used. The distance between hole centers is 5.6”. b. Slide both vent and intake air pipes through the holes, and cement them to the base of the vent termination kit using a primer and cement listed for use with PVC. c. Fasten the vent base to the wall using the supplied screws and anchors.
VII. Venting E. Assembly of CPVC/PVC Vent Systems (continued) Figure 7.30: Installation of IPEX Low Profile Terminal Through Sidewall Figure 7.
VII. Venting E. Assembly of CPVC/PVC Vent Systems (continued) Figure 7.32: Cutting IPEX and DiversiTech Concentric Vent Terminals Figure 7.
VII. Venting E. Assembly of CPVC/PVC Vent Systems (continued) Figure 7.34: Installation of IPEX and DiversiTech Concentric Terminal Through Roof f. Slip the partially assembled terminal through the wall or ceiling from the inside and for horizontal installations orient so that the side outlet on the Wye is on or above the horizontal plane. g. For horizontal installations, seal the gap between the OD of the “outer pipe” and the exterior side of the wall with RTV sealant. h.
VII. Venting F. Assembly of DuraVent PolyPro Vent Systems (continued) F. Assembly of DuraVent PolyPro Vent Systems 1. This boiler has been listed for use with the DuraVent PolyPro single wall Polypropylene vent system to be provided by the installer. WARNING Asphyxiation Hazard. Follow these instructions and the installation instructions included by the original Polypropylene venting component manufacturers, M&G/DuraVent.
VII. Venting F. Assembly of DuraVent PolyPro Vent Systems (continued) 3. Installation of Air Intake System - Start assembly of the PVC air intake system at the boiler. Assembly of the air intake system is done in the same manner as the vent system except as follows: a. Drill a 7/32” clearance hole into the front side of the air intake adapter.
VII. Venting F. Assembly of DuraVent PolyPro Vent Systems (continued) Figure 7.36: Installation of Duravent PolyPro UV Resistant Single Wall Horizontal Terminal Figure 7.
VII. Venting F. Assembly of DuraVent PolyPro Vent Systems (continued) 6. Installation of DuraVent PolyPro Horizontal Concentric Vent Terminal (Terminal Option D) Install PolyPro Horizontal Concentric Termination Kit #2PPS-HK or #3PPS-HK (Figure 7.39) as follows: a. At the planned location cut a 4-1/8” round hole for the 2” terminal or a 5-1/8” round hole for the 3” terminal in the exterior wall. (See Section VII - A of this manual for permitted terminal locations). b.
VII. Venting F. Assembly of DuraVent PolyPro Vent Systems (continued) Figure 7.39: Installation of Duravent PolyPro Concentric Vent Terminal Through Sidewall Figure 7.
VII. Venting F. Assy of DuraVent PolyPro & G. Selkirk Polyflue Vent Systems (continued) 8. Installations using PolyPro-flex (Vent Options 18,19,33,34): WARNING Asphyxiation Hazard. When using PolyPro flex, observe the following precautions: • PolyPro flex may be damaged by handling at low temperatures. Do not bend, uncoil, or attempt to install if it has been stored at a temperature below 42°F without allowing it to warm to a higher temperature first. • Do not bend PolyPro flex more than 45°.
VII. Venting G. Assembly of Selkirk Polyflue Vent Systems (continued) c. For each joint, verify that the gasket is evenly seated in the bell (female) end of the pipe. Lubricate this gasket with mild soapy water. Slide a Pipe Locking Band over the male end of the pipe to be joined as shown in Figure 7.41. Push the male end of the next section of pipe into the bell until it bottoms out, then back out 1/8— 1/4” to provide room for thermal expansion.
VII. Venting G. Assembly of Selkirk Polyflue Vent Systems (continued) NOTICE The venting system must be free to expand and contract and supported in accordance with the installation instructions included by the original Polypropylene venting component manufacturer, Selkirk. Polypropylene pipe sections must be disengaged 1/8 to 1/4 in. (3mm to 6mm) per joint to allow for thermal expansion. 6. Installations using flexible Polyflue (Vent Options 35,36): WARNING Asphyxiation Hazard.
VII. Venting G. Assembly of Selkirk Polyflue Vent Systems (continued) Figure 7.42: Installation of Selkirk Polyflue UV Resistant Single Wall Horizontal Terminal Figure 7.
VII. Venting H. Assembly of Centrotherm InnoFlue Vent Systems H. Assembly of Centrotherm InnoFlue Vent Systems 1. This boiler has been listed for use with the Centrotherm InnoFlue single wall Polypropylene vent system to be provided by the installer. WARNING Asphyxiation Hazard. Follow these instructions and the installation instructions included by the original Polypropylene venting component manufacturers, Centrotherm.
VII. Venting H. Assembly of Centrotherm InnoFlue Vent Systems (continued) 3. Installation of Air Intake System - Start assembly of the PVC air intake system at the boiler. Assembly of the air intake system is done in the same manner as the vent system except as follows: a. Drill a 7/32” clearance hole into the front side of the air intake adapter.
VII. Venting H. Assembly of Centrotherm InnoFlue Vent Systems (continued) Figure 7.45: Installation of Centrotherm InnoFlue UV Stabilized Single Wall Horizontal Terminal Figure 7.
VII. Venting H. Assembly of Centrotherm InnoFlue Vent Systems (continued) 6. Installations using InnoFlue Flex (Vent Options 20,21,37,38): WARNING Asphyxiation Hazard. When using InnoFlue Flex, observe the following precautions: • InnoFlue Flex may be damaged by handling at low temperatures. Do not bend, uncoil or attempt to install if it has been stored at a temperature below 42°F without allowing it to warm to a higher temperature first. • Do not bend InnoFlue Flex more than 45°.
VII. Venting I. Assembly of Stainless Steel Vent Systems I. Assembly of Stainless Steel Vent Systems 1. This boiler has been listed for use with Duravent FasNSeal Flex Stainless Steel vent systems to be provided by the installer. WARNING Asphyxiation Hazard. Follow these instructions and the installation instructions included by the original stainless steel venting component manufacturer DuraVent.
VII. Venting I. Assembly of Stainless Steel Vent Systems (continued) c. Flexible stainless steel vent shall be installed in an UNUSED masonry chimney and supplying combustion air through a separate wall or roof combustion air terminal. The unused chimney flue must be structurally sound and in good repair. A chimney is considered UNUSED when it is not being used for any appliance venting.
VII. Venting J. Condensate Trap and Drain Line J. Condensate Trap and Drain Line All condensate which forms in the boiler or vent system passes through the heat exchanger and out of a bottom drain port which is connected to the condensate trap with a hose. This trap allows condensate to drain from the heat exchanger while retaining flue gases in the boiler. This trap is an integral part of the boiler but must be connected to a drain pipe as shown in Figure 7.47.
VII. Venting K. Removing an Existing Boiler From a Common Chimney K. Removing an Existing Boiler From a Common Chimney This section only applies if this boiler is replacing an existing boiler that is being removed from a common chimney. In some cases, when an existing boiler is removed from a common chimney, the common venting system may be too large for the remaining appliances.
VIII. Gas Piping WARNING Explosion Hazard. Failure to properly pipe gas supply to boiler may result in improper operation or leaks of flammable gas. • Gas supply to boiler and system must be absolutely shut off prior to installing or servicing boiler gas piping. • Always assure gas piping is absolutely leak free and of the proper size and type for the connected load. • Use a thread compound compatible with liquefied petroleum gas.
VIII. Gas Piping (continued) GAS SUPPLY *MANUAL SHUT-OFF VALVE (FACTORY SUPPLIED - MUST BE INSTALLED WITHIN 6FT OF THE BOILER) GROUND JOINT UNION TEE CAP Figure 8.1: Gas Connection to Boiler Table 8.2: Minimum and Maximum Inlet Pressures 68 Model Max. (Natural & LP) Min. (Natural) Min. (LP) 080-120 14.0” 2.5” 11.
IX. System Piping A. General System Piping Precautions WARNING Failure to properly pipe boiler may result in improper operation and damage to boiler or structure. • Install boiler so that the gas ignition system components are protected from water (dripping, spraying, rain, etc.) during boiler operation and service (circulator replacement, etc.). • Oxygen contamination of boiler water will cause corrosion of iron and steel boiler components and can lead to boiler failure.
IX. System Piping (continued) B. Standard Piping Installation Requirements Observe the following requirements when installing the boiler piping: 1. Relief Valve (Required) – The relief valve is shipped loose and must be installed in the location shown in Figure 9.9, using the side outlet Tee and other fittings provided. ASME Section IV currently requires that this relief water or stream will not create a hazard or cause property damage if the valve opens.
IX. System Piping (continued) 10. Drain Valve (required) – Install the drain valve supplied as shown in Figure 9.9. 11. Low Water Cut-off (may be required by local jurisdiction) – Protection of this boiler against low water and/or inadequate flow is provided by the UL353 certified flow switch built into the boiler. This is a water tube boiler and this flow switch is therefore the only effective way to provide such protection.
IX. System Piping (continued) C. Near Boiler Piping Design Proper operation of this boiler requires that the water flow rate through it remain within the limits shown in Table 9.1 any time the boiler is firing. At flow rates below the minimum shown, the boiler’s flow switch and/or temperature rise limit function may prevent the boiler from firing. Flow rates through the boiler in excess of the maximum shown in Table 9.
107672-03 - 5/18 Optional Full Port Isolation Valves Heating Circulators Flow Check System Zone Valves To System To System Heating System Circulator Optional Full Port Isolation Valves Backflow Preventer Fill Valve Header Temperature Sensor (When Used) Drain Valve Boiler Pump Y-Strainer (Recommended) Figure 9.
Notes: 1. Refer to the boiler installation manual for additional piping and water quality requirements. 2. Piping supports not shown. Provide supports for relief valve and system piping to minimize the load placed on the Primary/Secondary Header connections. 3. Components marked (*) are supplied with the boiler. All other components are supplied by the installer. 4.
Figure 9.3a: Piping Method #1 - Near Boiler Piping - Heating Plus Indirect Water Heater IX.
Optional Full Port Isolation Valves Heating Circulators System Zone Valves Flow Check To System To System Expansion Tank Fill Valve Cold Water Line Indirect Return Indirect Supply Backflow Preventer Indirect Circulator Full Port Isolation Valves Header Temperature Sensor (When Used) Flow Check Full Port Isolation Valves Unions Tee & Plug (Recommended For Future Heat Exchanger Service) Relief Valve It is the installer's responsibility to select boiler piping configurations that provide
IX. System Piping (continued) Example – A 120MBH model is to be connected to a heating system as shown in Figure 9.6. A total of 20 ft of straight pipe will be installed between the boiler and the system loop. Count all fittings in the boiler loop (shaded in Figure 9.6): 3 90° Elbows 2 Turn in Tee (under boiler- primary-secondary tees not counted) 2 Isolation Valves 1 Y Strainer having a Cv of 30. Note: Unions, Secondary Connection Tees, and factory supplied fittings are ignored.
Figure 9.6: Piping Method #1 - Near Boiler Piping - Shaded Boiler Loop IX.
IX. System Piping (continued) Method 2: Direct Connection to Heating System (Generally NOT Recommended) In some relatively rare cases it may be possible to connect this boiler directly to the heating system as is done with conventional boilers (Figure 9.7). If this is done, the flow rate through the boiler will equal the flow rate through the system. The flow rate through the system must therefore always remain within the limits shown in Table 9.1.
IX. System Piping (continued) Note: These curves show the flow that can be achieved through the boiler as a function of the pressure drop through the connected piping. Figure 9.8a: Taco Net Circulator Performance Curve Figure 9.8b: Grundfos Net Circulator Performance Curve Note: Must use Speed HI to achieve the flow requirement shown in Table 9.
IX. System Piping (continued) D. Piping for Special Situations 1. System containing oxygen - Many hydronic systems contain enough dissolved oxygen to cause severe corrosion damage to a boiler. Some examples include: • • • Radiant systems that employ tubing without an oxygen barrier. Systems with routine additions of fresh water. Systems which are open to the atmosphere.
X. Wiring DANGER Electrical Shock Hazard. Positively assure all electrical connections are unpowered before attempting installation or service of electrical components or connections of the boiler or building. Lock out all electrical boxes with padlock once power is turned off. WARNING All wiring and grounding must be done in accordance with the authority having jurisdiction or, in the absence of such requirements, with the National Electrical Code /NFPA 70).
X. Wiring (continued) The use f the pump outputs are as follows: a. System Pump - Pumps water through the radiation. This pump is hydraulically sepa rated from the boiler pump, either by closely spaced tees, or by a hydraulic separator. The system pump is always on when the system is responding to a call for CH. Depending on the DHW configuration, it may also be on during a call for DHW. b. DHW Pump (“IWH Circulator”) - Pumps water directly through the indirect water heater.
X. Wiring (continued) Figure 10.2: High Voltage PCB Terminal Connections Figure 10.
X. Wiring (continued) • Outdoor Sensor - Tasseron TSA00AA Outdoor Temperature Sensor (1) • Outdoor Sensor - Tasseron TSA00AA Outdoor Temperature Sensor (2) • Header Sensor - Optional Honeywell 32003971-003 (103104-01) Sensor (1) • Header Sensor - Optional Honeywell 32003971-003 (103104-01) Sensor (2) • MODBUS - (A) • MODBUS - (B) • MODBUS - (-V) With the exception of the alarm contacts, external power must not be applied to any of the low voltage terminals - doing so may damage the boiler control.
X. Wiring (continued) Figure 10.4: 4-20 mA EMS Field Wiring Figure 10.
X. Wiring (continued) Close Nipple (Locate Header Sensor As Close As Possible To Downstream Tee) Primary/Secondary Tee Sensor Clip Header Temperature Sensor (Honeywell 32003971-003) (U.S.B.C. P/N: 103104-01) Well Should Extend Into Header Flow As Far As Possible. Use Extension Only If Necessary. Honeywell Immersion Well Figure 10.
X. Wiring (continued) Figure 10.
PAGE LEFT INTENTIONALLY BLANK.
X.
Figure 10.8: Internal Wiring Connections Diagram X.
X. Wiring (continued) Table 10.7: Internal Wire Connection Markings Cross Reference Table WIRE NO. IN FIG. 10.7 WIRE MARKING WIRE NO. IN FIG 10.
X. Wiring (continued) Figure 10.
X. Wiring (continued) Figure 10.
XI. Start-Up and Checkout WARNING Completely read, understand and follow all instructions in this manual before attempting start-up. NOTICE Safe lighting and other performance criteria were met with the gas train assembly provided on the boiler when the boiler underwent the test specified in ANSI Z21.13. Use the following procedure for initial start-up of the boiler: 1. 2. 3. 4. 5. Verify that the venting, water piping, gas piping and electrical system are installed properly.
XI. Start-Up and Checkout (continued) DANGER Asphyxiation Hazard. Failure to properly convert this boiler for use on LP gas can cause unreliable operation at elevated carbon monoxide (CO) levels, resulting in personal injury or death. NOTICE To minimize the risk of premature heat exchanger failure, observe the following water chemistry requirements: 1.
XI. Start-Up and Checkout (continued) MANUAL AIR VENT ATTACH 1/4" ID CLEAR TUBING TO HOSE BARB AND ROUTE TO SAFE PLACE AWAY FROM CONTROLS BEFORE OPENING VENT. FLAME ROD Figure 11.1: Location of Manual Air Vent 12. The boiler should attempt to fire approximately 30 seconds after a call for heat appears.
XI. Start-Up and Checkout (continued) Figure 11.2a: Home Screen at Power-Up (No Call for Heat) Figure 11.2b: Home Screen on Heat Demand Figure 11.2c: Home Screen with Active Fault Figure 11.
XI. Start-Up and Checkout (continued) Figure 11.4: Gas Valve Detail (80B-180B) Figure 11.
XI. Start-Up and Checkout (continued) WARNING conversion kit. Do not attempt to operate this boiler on LP gas without converting it using the proper • Do not attempt to convert this boiler to LP gas without the use of a combustion analyzer. • Failure to follow the conversion instructions will result in operation of the boiler at unsafe Carbon Monoxide (CO) levels and may result in personal injury or loss of life. Improper conversion may also result in unreliable operation, resulting in property damage.
XI. Start-Up and Checkout (continued) WARNING Asphyxiation Hazard. Use combustion analyzer for all gas valve adjustments. Low fire offset screw is very sensitive. Adjust offset no more than 1/8 turn before checking combustion with analyzer. Maximum total adjustment ± 1 turn. Failure to follow these instructions could result in death, serious injury or substantial property damage. To return the boiler to automatic modulation, press AUTO FIRE.
XI. Start-Up and Checkout (continued) 17. Perform a check of the ignition safety shut-off device. With the burner firing, carefully unplug the orange flame rod wire at the flame rod using a pair of insulated pliers (Figure 11.1). The burner should shut off immediately. 18. Test any external limits or other controls in accordance with the manufacturer’s instructions. 19. Refer to the Operation section to set-up the control for the system in which the boiler is installed.
XI.
XII. Operation IMPORTANT This boiler is equipped with a feature that saves energy by reducing the boiler water temperature as the heating load decreases. This feature is equipped with an override which is provided primarily to permit the use of an external energy management system that serves the same function.
XII. Operation (continued) 7. Warm Weather Shutdown (WWSD) Some boilers are used primarily for heating buildings, and the boilers can be automatically shutdown when the outdoor air temperature is warm. When outside air temperature is above the WWSD setpoint, this function will shut down the boiler, boiler and system pump. 8.
XII. Operation (continued) Setpoint or is automatically adjusted as Outdoor Air Reset. 5. Outdoor Air Reset If an outdoor temperature sensor is connected to the boiler and Outdoor Reset is enabled, the Central Heat setpoint will automatically adjust downwards as the outdoor temperature increases. When the water temperature is properly matched to heating needs there is minimal chance of room air temperature overshoot.
XII. Operation (continued) indication is provided. Additionally, the control monitors an air proving switch. During the boiler start sequence the control requires the air proving switch to be in the “open” position before the blower starts and in the “closed” position after the blower starts. If the air proving switch is not in the required position the start sequence is halted or the boiler is shut down and the open limit indication is provided.
XII. Operation (continued) 5. Customized Sequences Normally, boilers are started and stopped in numerical order. However, custom sequences may be established to optimize the heat delivery. For example, in order to minimize boiler cycling, a large boiler may be selected to run first during winter months and then selected to run last for the remainder of the year. 6.
XII. Operation (continued) E. Boiler Sequence of Operation 1. Normal Operation Table 12.3: Boiler Sequence of Operation Status Screen Display Priority: Standby Status: Standby Description (burner Off, circulator(s) Off) Boiler is not firing and there is no call for heat, priority equals standby. The boiler is ready to respond to a call for heat. Priority: (burner Off, circulator(s) On) Central Heat Boiler is not firing.
XII. Operation E. Boiler Sequence Of Operation (continued) 2. Using The Display The Control includes a touch screen LCD display. The user monitors and adjusts boiler operation by selecting screen navigation “buttons” and symbols. The “Home Screen” and menu selections are shown below. When no selection is made, while viewing any screen, the display reverts to the “Home Screen” after 4 minutes.
XII. Operation E. Boiler Sequence Of Operation (continued) 3. Status Screens Boiler Status screens are the primary boiler monitoring screens. The user may simply “walk” though boiler operation by repeatedly selecting the right or left “arrow” symbol. These screens are accessed by selected the “Status” button from the “Home” screen. Figure 12.6: Status Screens Figure 12.
XII. Operation E. Boiler Sequence Of Operation (continued) 3. Status Screens (continued) i Bargraph Screen The bargraph screen presents measured values for easy comparison. An information screen provides monitoring of “Rate Demand To Fan” and “Fan Speed Feedback”. These additional monitoring points are provided to help monitor blower performance. Pumping is a major part of any hydronic system.
XII. Operation E. Boiler Sequence Of Operation (continued) 3. Status Screens (continued) Zone Control Status Screens Active zones are shown by bold & underlined numbers. Press the zone panel to view zone cycle counts. Reset Cycle To reset all zone Counts cycle counts press: i < Zone Control Status press for zone cycles Zone Panel 1 NOTE Demand Zone cycles are resettable by selecting the KITCHEN reset “button” located on the information BEDROOMS screen.
XII. Operation E. Boiler Sequence Of Operation (continued) 5. Multiple Boiler Sequencer Screens When the Sequence Master is enabled the following screen is available: The Sequencer Status screen is selected by “pressing” “Status” button from the “Home” screen when Sequence Master is enabled.
XII. Operation (continued) F. Changing Adjustable Parameters 1. Entering Adjust Mode Adjust Mode The Control is factory programmed to include basic modulating boiler functionality. These settings are password protected to discourage unauthorized or accidental changes to settings. User login is required to view or adjust these settings: - - - Press the “Adjust” button on the “Home” screen.
XII. Operation F. Changing Adjustable Parameters (continued) 2. Adjusting Parameters (continued) The following pages describe the Control’s adjustable parameters. Parameters are presented in the order they appear on the Control’s Display, from top to bottom and, left to right.
XII. Operation F. Changing Adjustable Parameters (continued) 2. Adjusting Parameters (continued) WARNING Asphyxiation Hazard. Boiler type is factory set and must match the boiler model. Only change the boiler type setting if you are installing a new or replacement Control. The boiler type setting determines minimum and maximum blower speeds. Incorrect boiler type can cause hazardous burner conditions and improper operation that may result in PROPERTY LOSS, PHYSICAL INJURY OR DEATH.
XII. Operation F. Changing Adjustable Parameters (continued) Table 12.10: Parameters Changed Using the Boiler Type Parameter Selections: Control Service Part Kit Part Number 107877-01 Altitude Configuration 0-2000 Ft.
XII. Operation F. Changing Adjustable Parameters (continued) Expected Heat Rate Adjustment Screens (HeatMatch Software) The Control is shipped with defaults that will provide improved operation. Adjustment is only required to optimize setup. The expected heat rate adjustment is used to better match boiler output to the home heating needs. After receiving a “call for heat” the Control first uses the expected heat rate value to set a maximum heat rate.
XII. Operation F. Changing Adjustable Parameters (continued) “Press” button to access the following parameters: Factory Setting Range / Choices Never, Central Heat, Optional Priority Parameter and Description System Pump run pump for: Activates the system pump output according to selected function. Never: Pump is disabled and not shown on status screen. Any Demand, Any Demand: Pump Runs during any call for heat.
XII. Operation F.
XII. Operation F.
XII. Operation F.
XII. Operation F.
XII. Operation F. Changing Adjustable Parameters (continued) “Press” button to access the following parameters: Factory Range / Choices Setting 180°F (82.2°C) Parameter and Description 60°F to 190°F (16°C to 87.8°C) Central Heat Setpoint Target temperature for the central heat priority. Value also used by the outdoor air reset function. 10°F (5.6°C) 2°F to 25°F (1.1°C to 14°C) Central Heat Diff Above The boiler stops when the water temperature rises ‘Diff Above’ degrees above the setpoint.
XII. Operation F. Changing Adjustable Parameters (continued) “Press” button to access the following parameters: Factory Setting Range / Choices 180°F (82.2°C) 60°F to 190°F (16°C to 87.8°C) Parameter and Description Auxiliary Heat Setpoint Target temperature for the Auxiliary Heat priority. Value also used by the outdoor air reset function. 10°F (5.6°C) 2°F to 25°F (1.1°C to 14°C) Auxiliary Heat Diff Above The boiler stops when the water temperature rises ‘Diff Above’ degrees above the setpoint.
XII. Operation F. Changing Adjustable Parameters (continued) “Press” Factory Setting button to access the following parameters: Range / Choices Parameter and Description Domestic Hot Water Heater Type IHW Tank Selected when boiler is piped to an indirect water heater. Combi Selected when a Combi Kit is attached to the boiler. When selected, special parameters are entered to allow the required Combi rate of response.
XII. Operation F. Changing Adjustable Parameters (continued) “Press” Factory Setting Enabled button to access the following parameters: Range / Choices Enable Disable Parameter and Description Central Heat Outdoor Reset Enable If an outdoor sensor is installed and Outdoor Reset is Enabled, the boiler will automatically adjust the heating zone set point temperature based on the outdoor reset curve in Figure 8. The maximum set point is defined by the Central Heat Setpoint [factory set to 180°F (82.
XII. Operation F. Changing Adjustable Parameters (continued) “Press” Factory Setting Enabled button to access the following parameters: Range / Choices Enable Disable Parameter and Description Auxiliary Heat Outdoor Reset Enable If an outdoor sensor is installed and Outdoor Reset is Enabled, the boiler will automatically adjust the heating zone set point temperature based on the outdoor reset curve in Figure 8. The maximum set point is defined by the Central Heat Setpoint [factory set to 180°F (82.
XII. Operation F. Changing Adjustable Parameters (continued) Figure 12.13: Outdoor Reset Curve Central Heat Setpoint Heating Element Type Central Heat Setpoint Heating Element Type 180°F to 190°F (82.2°C to 87.8°C) Fan Coil 100°F to 140°F (37.8°C to 60°C) In Slab Radiant High Mass Radiant 160°F to 190°F (71.1°C to 87.8°C) Convection Baseboard Fin Tube Convective 130°F to 160°F (54.4°C to 71.1°C) Staple-up Radiant Low Mass Radiant 130°F to 160°F (54.4°C to 71.
XII. Operation F. Changing Adjustable Parameters (continued) “Press” Factory Setting Disable Boiler Piped Disabled 180 Secs 195°F (90.6°C) 70% 3 button to access the following parameters: Range / Choices “Press” Factory Setting Parameter and Description Master Enable/Disable Enable, The Sequencer Master Enable/Disable is used to “turn on” the Multiple Boiler Controller. Disable Warning! enable ONLY one Sequence Master.
XII. Operation F. Changing Adjustable Parameters (continued) “Press” Factory Setting button to access the following parameters: Range / Choices Parameter and Description Central Heat Modulation Source This parameter enables the 4-20mA input to control firing rate and the thermostat input to control boiler on/off demand directly without using the internal setpoint.
XIII. Service and Maintenance Important Product Safety Information Refractory Ceramic Fiber Product WARNING The Service Parts list designates parts that contain refractory ceramic fibers (RCF). RCF has been classified as a possible human carcinogen. When exposed to temperatures above 1805°F, such as during direct flame contact, RCF changes into crystalline silica, a known carcinogen.
XIII. Service and Maintenance (continued) WARNING Asphyxiation Hazard. Fire Hazard. Explosion Hazard. This boiler requires regular maintenance and service to operate safely. Follow the instructions contained in this manual. Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Read and understand the entire manual before attempting installation, start-up operation, or service.
XIII. Service and Maintenance (continued) NOTICE Warranty does not cover boiler damage or malfunction if the following steps are not performed at the intervals specified. 1. Continuously: a. b. c. Keep the area around the boiler free from combustible materials, gasoline and other flammable vapors and liquids. Keep the area around the combustion air inlet terminal free from contaminates. Keep the boiler room ventilation openings open and unobstructed. 2. Monthly Inspections: a.
XIII. Service and Maintenance (continued) When disconnecting flexible gas line; Place a backup wrench on this nut to prevent damage to the gas valve. Flexible Gas Line Connection Figure 13.1: Disconnecting Flexible Gas Line Figure 13.
XIII. Service and Maintenance (continued) i. Unplug the ignition, ground, and flame rod wires from the ignition electrode and the flame rod (Figure 13.2). j. Use a 10 mm wrench to remove the four nuts securing the fire door to the heat exchanger (Figure 13.2). Carefully remove the door/blower/gas valve assembly from the heat exchanger, being careful not to damage the refractory insulation on the inside of the door (see Refractory Warning on page 133) or the electrodes. k.
XIII. Service and Maintenance (continued) Figure 13.3: Ignition Electrode Gap Figure 13.
XIII. Service and Maintenance (continued) Refer to Section VII “Venting” to re-assemble any vent system components that are disassembled during this inspection and for details on supporting, pitching, and terminating the vent system. s. Replace any wiring which has been disconnected. t. Inspect the hydronic system. Look for leaks and repair any found. If system contains antifreeze, or other additives, test and/or maintain them as directed by the additive manufacturer. Refer to Section XI.
XIV. Troubleshooting WARNING Electrical Shock Hazard. Turn off power to boiler before working on wiring. A. Troubleshooting problems where no error code is displayed. Condition Possible Cause Boiler not responding to call for heat, “Status” and “Priority” show “Standby”. Boiler not responding to a call for heat, “Status” shows “Standby” and “Priority” shows Central Heat or Domestic Hot Water. Boiler is not seeing call for heat.
XIV. Troubleshooting (continued) C. Help Screen Faults Indication Condition Zone Panel 1 Setup Flashing Zone Panel Failure Zone Panel Setup Possible Cause Zone Panel 1 communication lost, typical for Panel 1 through 4: The zone panel’s communication was established and then lost. Check the following to correct the issue: • Wiring between panel and boiler.
XIV. Troubleshooting (continued) E. Active Fault Screen Faults Indication Condition Limit String Status Limit String Fault Sensor Status NOTE: Since the limit string items are wired in series, all limits downstream of the “open” limit will also appear on the screen as “open” (blinking) icons regardless of whether or not they are actually open. The Air Proving Switch is wired independent to all other limits. The Air Proving Switch is only required to be closed during boiler prepurge.
XIV. Troubleshooting (continued) F. Troubleshooting problems where a Soft Lockout Code is displayed. When a soft lockout occurs, the boiler will shut down, the display will turn red and the “Help” button will “blink”. Select the “blinking” “Help” button to determine the cause of the soft lockout. The boiler will automatically restart once the condition that caused the lockout is corrected.
XIV. Troubleshooting (continued) Soft Lockout Codes Displayed (continued) Lockout Number Condition 13 • Flame rod shorted to ground • Flame rod shorted to ground Condensate Trap plugged or dirty. Possible Cause • • • Shorted or mis-wired flame rode wiring. Defective flame rod. Plugged or dirty drain line in trap. 14 • Inadequate boiler water flow.
XIV. Troubleshooting (continued) G. Troubleshooting problems where a Hard Lockout Code is displayed. When a hard lockout occurs, the boiler will shut down, the display will turn red and the “Help” button will “blink”. Select the “blinking” “Help” button to determine the cause of the Hard Lockout. Once the condition that caused the lockout is corrected, the boiler will need to be manually reset using the Reset button on the “Active Fault” display or located on the Control.
XV. Service Parts All K2WT™ Series Service Parts may be obtained through your local U.S. Boiler Wholesale distributor. Should you require assistance in locating a U.S. Boiler distributor in your area, or have questions regarding the availability of U.S. Boiler products or service parts, please contact U.S. Boiler Customer Service at (717) 481-8400 or Fax (717) 481-8408.
XV. Service Parts (continued) Key No.
XV.
XV. Service Parts (continued) Key No.
XV. Service Parts (continued) Part Number Key No.
XV. Service Parts (continued) Key No.
XV.
XV. Service Parts (continued) Key No. Description Part Number (Qty) 080 100 120 75 Transformer 106034-01 76 Sage 2.
95 85 86 91 XV.
XV. Service Parts (continued) Key No.
XV. Service Parts (continued) Key Description No.
XV. Service Parts (continued) 130 133 131 134 135 132 Key No.
Appendix A: Instructions for High Altitude Installations Above 2000 ft. WARNING If installing K2WT-080B or K2WT-180B, do not attempt to convert K2WT-080B for use with LP at altitudes above 2000 ft. Also, do not attempt to install K2WT-180B at altitudes above 2000ft. K2WT180M shall be installed at altitudes ranging from 2001-10100ft. Attempts to do so may result in unreliable operation, property damage, personal injury or loss of life due to carbon monoxide (CO) poisoning.
Appendix A - (continued) Table A1: K2WT Altitude Adjustments for Natural Gas (Above 2000 ft. only) Measured %CO2* Model No. 2001-6000 ft. 6001-7800 ft. 7801-10,100 ft. Range Target Range Target Range Target K2WT-080B 8.4-8.7 8.7 8.6-8.9 8.9 8.6-8.9 8.9 K2WT-100B 8.8-9.1 9.1 8.6-8.9 8.9 8.6-8.9 8.9 K2WT-120B 8.9-9.2 9.2 8.9-9.2 9.2 8.6-8.9 8.9 K2WT-150B 8.9-9.2 9.2 9.0-9.3 9.3 8.8-9.1 9.1 8.7-9.0 9.0 K2WT-180B K2WT-180M Not Permitted 8.7-9.0 9.0 8.7-9.0 9.0 Max.
Appendix A - (continued) Table A2: K2WT Altitudes Derates for Natural Gas Model No. Approximate Derate per 1000 ft. 2001-6000 ft. 6001-7800 ft. 7801-10,100 ft. K2WT-080B 0.9% 4.0% 4.0% K2WT-100B 1.9% 2.6% 2.7% K2WT-120B 1.2% 1.8% 2.4% K2WT-150B 2.6% 2.9% 3.1% K2WT-180B K2WT-180M Not Permitted 0.1% 1.9% 3.0% NOTE: THESE DERATES ARE AT MINIMUM VENT LENGTH Max. Vent Length 135 eq.
Appendix B: Special Requirements For Side-Wall Vented Appliances In The Commonwealth of Massachusetts IMPORTANT The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4.00 and 5.
Appendix B - (continued) 1. Detailed instructions for the installation of the venting system design or the venting system components; and 2. A complete parts list for the venting system design or venting system. (d) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED.
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U.S. Boiler Company, Inc. P.O. Box 3020 Lancaster, PA 17604 1-888-432-8887 www.usboiler.
