37AHB SERIES HYDRONIC FURNACE SIZES 045 THRU 090 Installation, Operation, and Maintenance Manual Consumer Safety Information ................................ 2 Overview of the Rinnai Hydronic Furnace ............ 3 Model Number Nomenclature ................................ 3 Physical Data ......................................................... 4 Receiving & Checking Equipment ......................... 5 Installation Clearances .....................................................
Consumer Safety Information SAFETY DEFINITIONS Indicates safety alerts. When this symbol is seen on the Hydronic Furnace and in all instructions and/or manuals, be alert to the potential for personal injury. Recognize signal words DANGER, WARNING, and CAUTION. These words are used with the safety alert symbol. DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
Overview of the Rinnai Hydronic Furnace (RHF) INTRODUCTION: The optimum in hydronic technology: the updated Rinnai® multi-position Hydronic Furnaces offer a unique solution for a wide variety of small and medium sized residential and light commercial applications. They are compact and ready to fit in tight spaces which may include, but not limited to, attics, basements, closets, crawlspaces, and utility rooms.
Table 1 - Physical Data DIMENSIONS A UNIT SIZE B C D E in. mm in. mm in. mm in. mm in. mm 37AHB04508KA5 14 355.6 18 457.2 12 304.8 10 - 1/2 266.7 19 482.6 37AHB06012KA5 17 -1/2 444.5 18 457.2 16 406.4 16 - 11/16 423.9 19 - 1/4 489.0 37AHB07514KA5 21 533.4 18 457.2 20 508 18 - 11/16 474.7 19 - 1/2 495.3 37AHB09016KA5 24 - 1/2 622.3 18 457.2 24 609.6 21 - 1/8 536.6 19 482.6 C B 1" 7/8” Dia. KO Thermostat Wire Entry (Typ.
Receiving and Checking Equipment IDENTIFY UNIT The unit model number and serial number are stamped on the unit identification / name plate (located on the top right side of unit). Check this information against shipping papers and job requirements. INSPECT SHIPMENT Upon receipt of a 37 Series Hydronic Furnace the packaging should be checked for peripheral signs of transportation damage while unit is still in the shipping package.
Installation LOCATING AND MOUNTING THE HYDRONIC FURNACE General The multi-position 37AHB Series Hydronic Furnaces are shipped in packaged configuration. This means that the units may be installed without assembly and/ or modifications when configured for bottom return air inlet application; however, some modifications and assembly are necessary if units are to be installed in an application that requires side return air inlet arrangement.
Installation Blower located below coil section. Conditioned air is discharged upward. Blower located to the left of coil section. Conditioned air is discharged to the right. Blower located to the right of coil section. Conditioned air is discharged to the left. Blower located above coil section. Conditioned air is discharged downward.
Installation CLOSET INSTALLATION (RETURN AIR THRU OPENING OR GRILL) The 37AHB Hydronic Furnace can be installed in a closet on a supporting stand or be mounted from the closet wall using the closet as the return air plenum. Unit should be high enough from the floor to provide unimpeded return air flow into the bottom of the cabinet.
Installation Attachment Methods Using Straps AIR SYSTEM Method 1 Existing Ductwork Use (4) #8 x 3/4 sheet metal screws for each strap. Straps to be vertical against the unit’s sides and not allowed to be pulled away from the sides. It is the responsibility of the installer to inspect all previously installed air distribution systems to determine its suitability for the new heating and/or cooling system. Existing ductwork may have to be modified and/or insulated to provide satisfactory air distribution.
Installation PLUMBING Mechanical Joining of Tubing: Codes: Where used, refer to the respective mechanical system manufacturer’s installation instructions. Observe all local sanitary codes when installing water lines. The water supply mating connection to the 37AHB Hydronic Air-Handling Units are made via the two (3/4 in. Dia. X 2-1/2 in. Long) copper stubs to the front-left of the unit labeled “WATER IN” and “WATER OUT” (see Figure 1). Mating connectors to be two field supplied 3/4 in.
Installation Hydraulic Resistance of Fittings, Valves, and Other Devices: Before the total hydraulic resistance of a piping circuit can be found, the individual hydraulic resistances of all fittings, valves, or other such components must be determined. One approach is to consider each fitting, valve, or other device as an equivalent length of copper tube of the same pipe size (see Table 2).
Installation ¾” Tubing (total straight pipe length)....68 ft. PROCEDURE FOR CALCULATING THE TOTAL EQUIVALENT LENGTH OF PIPE (6) ¾” 90 deg. Elbows….……..6(2) = 12 ft. Given piping assembly as shown in Figure 10 below, what is the total equivalent length of the system? (2) ¾” Side port tee……….…..2(3) = 6.0 ft. (1) ¾” Taco air separator….1(0.3) = 0.3 ft. First determine the total straight pipe lengths; next refer to table 2 to determine the equivalent straight pipe length for each fitting shown.
Installation Piping Configuration air bubbles. When employing a Tankless Water Heater in a combination hydronic hot water heating system, the system is considered an Open Loop System; i.e. the system must be configured to simultaneously deliver both domestic hot water and space heating. By definition, if the circuit is sealed off from the atmosphere at all locations (as is true for most modern hydronic systems) it is called a closed loop system.
Installation ELECTRICAL CONNECTIONS side) follow steps 1 thru 7 below: Line-Voltage Connections: 1. Remove and keep one screw and cover from the Control Box. U.S. INSTALLATIONS: Make all electrical connections in accordance with National Electrical Code (NEC) ANSI/NFPA 70 and all local codes or ordinances having jurisdiction. CANADIAN INSTALLATIONS: Make all electrical connections in accordance with Canadian Electrical Code CSA C22.1 and all authorities having jurisdiction.
Installation NOTES: W 1. Connect Y1 terminal as shown for proper operation. R C Single Stage Thermostat (Available Accessory) Y1 5 Wire 2. Rinnai thermostats require a “C” terminal connection as shown. 3. If any of the original wire, as supplied, must be replaced, use the same type or equivalent wire.
Installation System Low Voltage Wiring Diagrams NOTE: Local codes may require thermostat wiring to be routed through conduit or raceways. In such instances splices can be made inside the Hydronic Furnace. All wiring must be NEC Class l and must be separated from incoming power leads. IMPORTANT: Where possible, use a Rinnai factory authorized thermostat with the 37AHB series Hydronic Furnaces.
Installation Dip Switch Options (Smart Operating System): THERMOSTAT INSTALLATION: The Rinnai® exclusive Smart Operating System is a feature of your 37AHB series Hydronic Furnace’s control system that is designed to allow the installer (via DIP Switch – SW1) to configure the unit for single or two stage, A/C or Heat pump systems with selectable heat bower off delay. Safety Considerations: Refer to Figures 14 and 15 for the proper dip switch setting to be used with the desired configuration.
Installation THERMOSTAT WIRING DIAGRAMS HEAT/COOL & COOL ONLY THERMOSTATS SINGLE STAGE HYDRONIC FURNACE Y1 SINGLE SPEED CONDENSING UNIT Y1 Shunt Jumper Options: An additional feature of the 37AHB series is its selectable operating sequence option; the 3-pin shunt header (P7) allows the control to operate the proper heating logic based on the following system requirements: FIRST STAGE HEAT/COOL Y1 AUX HEATING W W FAN G G The 37AHB unit in Open Loop configuration: O “FS” Shunt selection: The “
Installation START-UP PROCEDURE (HEATING ONLY): The following conditions must be met prior to unit start -up. TROUBLESHOOTING BLOWER AND/OR PUMP MOTOR AND CONTROLS If blower and/or pump motor does not run: Debris from soldering and/or other installation activities can cause equipment failure. Ensure that all associated lines and appurtenances are free of debris. Turn off power and check the following: Check to ensure that unit is secure. 2. Check 3 amp fuse on Printed Circuit Board (PCB). 1.
Installation NOTES: 1 2 3 4 5 6 7 8 START SYSTEM PURGED NO Pipe system between Tankless Water Heater and Hyronic Furnace ‡ Leak check piping system Purge and prime plumbing system Perform required electrical work Check system operation with power to condensing unit off (if installed) Control board is sometimes refered to as 'PCB' Hyronic Furnace is sometimes refered to as 'RHF' Typical for all check, ensure system is in the following operating mode: AC / SINGLE STAGE RETURN TO PURGE & PRIME STEPS ‡ 9
Installation ( ) START WITH DOOR SWITCH CLOSED (SET SYSTEM IN HEATING MODE; CALL FOR HEAT) NO GO TO RHF START-UP & 'LED' TROUBLESHOOTING IS 'LED' ON YES PULSING FLASH WITH PUMP AND FAN ENERGIZED (associated with contactor clicking sound) - WRONG SHUNT POSITION FOR OPERATING MODE - REFER TO FIG.
Installation START WITH DOOR SWITCH CLOSED (SET SYSTEM IN HEATING MODE -CALL FOR HEAT) YES YES STEADY 'LED' FLASH RAPID 'LED' FLASH IS 'LED' ON NO GO TO RFH START-UP & 'LED' TROUBLESHOOTING YES PUMP ENERGIZED PUMP AMP DRAW NORMAL NO ADJUST THERMOSTAT SET TEMPERATURE HIGHER THAN ROOM TEMPERATURE PUMP ENERGIZED YES NO CHECK CAPACITOR; IF DEFECTIVE, REPLACE COMPONENT AND RE-CHECK AMP DRAW PUMP AMP DRAW NORMAL NO YES REPLACE PUMP MOTOR AND RETURN TO START NO CHECK FOR LOOSE OR BROKEN WIRES Y
Installation START WITH DOOR SWITCH CLOSED (SET SYSTEM IN HEATING MODE -CALL FOR HEAT) NO YES GO TO HYDRONIC FURNACE START UP AND 'LED' TROUBLESHOOTING IS 'LED' ON 24V BETWEEN THERMOSTAT AND PCB CHECK TRANSFORMER FOR CORRECT VOLTAGES PRI:VAC = 115V +/SEC: VAC = 24V +/- NO (1) CHECK FOR WIRING PROBLEM(S) (2) CHECK TRANSFORMER; IF DEFECTIVE, REPLACE FAULTY COMPONENT NO (1) CHECK FOR WIRING PROBLEM(S) (2) CHECK FUSE; IF DEFECTIVE, REPLACE FAULTY COMPONENT YES CHECK 3 AMP FUSE; IS FUSE INTACT YES
Sequence of Operation SEQUENCE OF OPERATION: Single-Stage Heat-Pump (HP) Cooling Demand: NOTE: Furnace control must be grounded for proper operation; control is grounded through green wire routed to control box screw. When the thermostat calls for cooling (Y and O), the control waits for the 1 second cooling on delay period and energizes the COOL_HI blower tap.
Sequence of Operation If the FS signal is NOT present, the control will energize the circulating pump for 60 seconds in an attempt to activate the Flow Sensor (FS). If the FS signal does not become active during the time, the control will de-energize the circulating pump for 60 seconds and then start another 60 seconds with the circulating pump energized to try to activate the Flow Sensor.
Sequence of Operation If the FS input signal remains (indicating that there is adequate hot water flow) the circulator pump will remain energized, the HEAT blower speed and HUM outputs will then be energized. If the emergency heat demand (W) is removed, the HEAT blower speed will immediately be de-energized and the blower will return to the appropriate speed based on any remaining thermostat demand.
Maintenance 4. Install new motor, and reassemble circulator using the new gasket and bolts supplied. 5. Follow the “installation” procedure to start up the circulator. Replacing Pump Cartridge Assembly: 1. Disconnect the electrical supply. 2. Reduce system pressure to 0 psi and allow system to return to room temperature. Isolate the circulator by closing the service valves or draining the system. 3. Remove the body bolts and swing motor assembly away from the volute. 4.
Selection Guide GENERAL UNIT SELECTION PROCEDURE (WITH EXAMPLE) I. Define hot water load for the total required domestic hot water usage: To help with the sizing and selection of your new Rinnai Tankless Water Heater (TWH), refer to our Website at: http://www.rinnai.
Air Distribution Guide Hydronic Furnace, He/ She should adhere to the following basic rules whenever possible. 1. Duct joints shall be, as a rule, sealed to prevent leakage of air which may cause objectionable sound. 2. Round ducts are favored to rectangular (on the supply side) as they offer greater rigidity and higher efficiency. 3. Fitting selection and placement should also be carefully studied as the correct fitting and its location will avoid excessive pressure drops and likely noise problems. 4.
1700 1600 1500 1400 1300 1200 1100 1050 1000 34 2300 2200 2100 2000 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 46 NOL MAF NOL 44 32 42 30 23 40 28 22 38 26 21 36 24 20 34 22 19 950 12 32 21 18 900 11 30 20 17 850 10 500 28 19 950 16 800 9 450 26 18 900 15 750 24 17 850 14 700 22 16 800 13 650 20 15 750 12 600 5 MAF 24 13 550 6 26 14 600 7 NOL 15 650 4 8 1300 1200 1150 1100 1050 1000 16 700 5 250 MAF 17 750 6 200 30
Table 4: Hydronic Furnace’s Specifications UNIT MODELS Trade Name RATING AND PERFORMANCE Nominal Output Capacity (BTU/h) † Air Side Temperature Rise Rate in oF ( 68ºF Entering Air @ 150ºF Entering Water) External Static Pressure Nominal Airflow (CFM) 37AHB04508KA5 37AHB06012KA5 37AHB07514KA5 37AHB09016KA5 AHB45 AHB60 AHB75 AHB90 Descriptor (Typ.) 45,000 60,000 75,000 90,000 Heat Speed 50 50 50 50 (in. W.C.) Heating Cooling Range 0 to 1.0 800 ‡ 650 - 800 0 to 1.0 1200 ‡ 650 - 1200 0 to 1.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 5 (L) TAP 4 (M) TAP 3 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB45 + RC98HPi(e) 2.0 130 120 AHB45 + RC98HPi(e) 2.0 130 120 AHB45 + RC98HPi(e) SUPPORTS COOLING CAP. RANGE (TONS) 56.7 49.7 42.1 35.8 30.1 803 58.4 50.2 44.4 37.6 32.2 921 58.9 50.9 44.1 36.7 31.6 948 0 54.2 47.5 40.3 34.2 28.7 768 56.5 48.6 43.0 36.4 31.1 891 57.2 49.4 42.8 35.7 30.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 33 UNIT SIZE TAP 5 (L) TAP 4 (M) TAP 3 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB45 + RC80HPi(e) 2.0 130 120 AHB45 + RC80HPi(e) 2.0 130 120 AHB45 + RC80HPi(e) SUPPORTS COOLING CAP. RANGE (TONS) 55.0 49.0 41.1 35.3 31.2 803 58.7 52.1 45.8 37.2 31.8 921 59.3 52.3 46.0 37.4 31.4 948 0 52.6 46.8 39.3 33.8 29.8 768 56.7 50.4 44.3 36.0 30.8 891 57.6 50.8 44.7 36.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 5 (L) TAP 4 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB60 + RC98HPi(e) 2.0 130 120 AHB60 + RC98HPi(e) 2.5 130 120 AHB60 + RC98HPi(e) 3.0 130 120 AHB60 + RC98HPi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 35 UNIT SIZE TAP 5 (L) TAP 4 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB60 + RC80HPi(e) 2.0 130 120 AHB60 + RC80HPi(e) 2.5 130 120 AHB60 + RC80HPi(e) 3.0 130 120 AHB60 + RC80HPi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 4 (L) TAP 3 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 130 160 150 140 2.5 160 150 140 130 120 AHB75 + RC98HPi(e) 3.0 130 120 AHB75 + RC98HPi(e) 3.5 120 AHB75 + RC98HPi(e) 4.0 130 120 AHB75 + RC98HPi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 37 UNIT SIZE TAP 4 (L) TAP 3 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 130 160 150 140 2.5 160 150 140 130 120 AHB75 + RC80HPi(e) 3.0 130 120 AHB75 + RC80HPi(e) 3.5 120 AHB75 + RC80HPi(e) 4.0 130 120 AHB75 + RC80HPi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 4 (L) TAP 3 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 130 160 150 140 3.0 160 150 140 130 120 AHB90 + RC98HPi(e) 3.5 130 120 AHB90 + RC98HPi(e) 4.0 120 AHB90 + RC98HPi(e) 5.0 130 120 AHB90 + RC98HPi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 39 UNIT SIZE TAP 4 (L) TAP 3 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 130 160 150 140 3.0 160 150 140 130 120 AHB90 + RC80HPi(e) 3.5 130 120 AHB90 + RC80HPi(e) 4.0 120 AHB90 + RC80HPi(e) 5.0 130 120 AHB90 + RC80HPi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 5 (L) TAP 4 (M) TAP 3 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB45 +V53i 2.0 130 120 AHB45 +V53i 2.0 130 120 AHB45 +V53i SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 57.7 51.7 45.2 38.4 32.3 803 60.6 54.6 47.0 40.5 33.9 921 61.1 54.9 47.9 41.0 34.5 948 0 55.2 49.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 41 UNIT SIZE TAP 5 (L) TAP 4 (M) TAP 3 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB45 + R75-LSi(e) 2.0 130 120 AHB45 + R75-LSi(e) 2.0 130 120 AHB45 + R75-LSi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 54.7 48.7 41.7 36.1 29.0 803 57.8 52.3 45.8 38.3 31.7 921 59.3 52.9 46.4 38.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 5 (L) TAP 4 (M) TAP 3 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB45 + R94-LSi(e) 2.0 130 120 AHB45 + R94-LSi(e) 2.0 130 120 AHB45 + R94-LSi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 53.6 47.5 42.0 36.2 29.5 803 57.0 50.8 43.8 38.2 31.9 921 58.0 51.4 45.2 38.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 43 UNIT SIZE TAP 5 (L) TAP 4 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB60 + V53i 2.0 130 120 AHB60 + V53i 2.5 130 120 AHB60 + V53i 3.0 130 120 AHB60 + V53i SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.1 0.2 0.3 0.5 0.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 5 (L) TAP 4 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB60 + R75-LSi(e) 2.0 130 120 AHB60 + R75-LSi(e) 2.5 130 120 AHB60 + R75-LSi(e) 3.0 130 120 AHB60 + R75-LSi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 45 UNIT SIZE TAP 5 (L) TAP 4 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB60 + R94-LSi(e) 2.0 130 120 AHB60 + R94-LSi(e) 2.5 130 120 AHB60 + R94-LSi(e) 3.0 130 120 AHB60 + R94-LSi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 4 (L) TAP 3 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 130 160 150 140 2.5 160 150 140 130 120 AHB75 + R75-LSi(e) 3.0 130 120 AHB75 + R75-LSi(e) 3.5 120 AHB75 + R75-LSi(e) 4.0 130 120 AHB75 + R75-LSi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 47 UNIT SIZE TAP 4 (L) TAP 3 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 130 160 150 140 2.5 160 150 140 130 120 AHB75 + R94LSi(e) 3.0 130 120 AHB75 + R94LSi(e) 3.5 120 AHB75 + R94LSi(e) 4.0 130 120 AHB75 + R94LSi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 4 (L) TAP 3 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 130 160 150 140 3.0 160 150 140 130 120 AHB90 + R75-LSi(e) 3.5 130 120 AHB90 + R75-LSi(e) 4.0 120 AHB90 + R75-LSi(e) 5.0 130 120 AHB90 + R75-LSi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 49 UNIT SIZE TAP 4 (L) TAP 3 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP EWT (OF) 160 150 140 160 150 140 130 160 150 140 3.0 160 150 140 130 120 AHB90 + R94LSi(e) 3.5 130 120 AHB90 + R94LSi(e) 4.0 120 AHB90 + R94LSi(e) 5.0 130 120 AHB90 + R94LSi(e) SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 5 (L) TAP 4 (M) TAP 3 (H) ECM SPEED TAP O EWT ( F) 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB45 + R98LSi(e)/ASME 2.0 130 120 AHB45 + R98LSi(e)/ASME 2.0 130 120 AHB45 + R98LSi(e)/ASME SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 60.8 53.5 45.4 38.5 32.3 803 62.8 54.0 47.7 40.4 34.6 921 63.3 54.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 51 UNIT SIZE TAP 5 (L) TAP 4 (M) TAP 3 (H) ECM SPEED TAP O EWT ( F) 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB45 + R63LSe2 2.0 130 120 AHB45 + R63LSe2 2.0 130 120 AHB45 + R63LSe2 SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 57.4 51.4 44.9 38.2 32.2 803 60.2 54.2 46.6 40.2 33.7 921 59.6 54.5 46.6 40.1 34.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 5 (L) TAP 4 (M) TAP 3 (H) ECM SPEED TAP O EWT ( F) 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB45 + R50LSi 2.0 130 120 AHB45 + R50LSi 2.0 130 120 AHB45 + R50LSi SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 58.1 52.1 45.6 38.6 32.6 803 61.1 55.0 47.3 40.7 34.1 921 61.3 55.4 48.6 42 35.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 53 UNIT SIZE TAP 5 (L) TAP 4 (M) TAP 3 (H) ECM SPEED TAP O EWT ( F) 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB45 + V53e 2.0 130 120 AHB45 + V53e 2.0 130 120 AHB45 + V53e SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 55.0 49.0 41.1 35.3 31.2 803 58.7 52.1 45.8 37.2 31.8 921 59.3 52.3 46 37.4 31.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 5 (L) TAP 4 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP O EWT ( F) 160 150 140 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB60 + R98LSi(e)/ASME 2.0 130 120 AHB60 + R98LSi(e)/ASME 2.5 130 120 AHB60 + R98LSi(e)/ASME 3.0 130 120 AHB60 + R98LSi(e)/ASME SUPPORTS COOLING CAP.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 55 UNIT SIZE TAP 5 (L) TAP 4 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP O EWT ( F) 160 150 140 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB60 + R63LSe2 2.0 130 120 AHB60 + R63LSe2 2.5 130 120 AHB60 + R63LSe2 3.0 130 120 AHB60 + R63LSe2 SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.1 0.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 5 (L) TAP 4 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP O EWT ( F) 160 150 140 160 150 140 160 150 140 1.5 160 150 140 130 120 AHB60 + R50LSi 2.0 130 120 AHB60 + R50LSi 2.5 130 120 AHB60 + R50LSi 3.0 130 120 AHB60 + R50LSi SUPPORTS COOLING CAP. RANGE (TONS) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NET HEATING CAPACITY (MBH) NOMINAL HEATING CAPACITY 0.1 0.2 0.3 0.
Rinnai Corporation Hydronic Furnace (37AHB) Manual 57 UNIT SIZE TAP 4 (L) TAP 3 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP O EWT ( F) 160 150 140 160 150 140 160 150 140 130 2.5 160 150 140 130 120 AHB75 + R98LSi(e)/ASME 3.0 120 AHB75 + R98LSi(e)/ASME 3.5 130 120 AHB75 + R98LSi(e)/ASME 4.0 130 120 AHB75 + R98LSi(e)/ASME SUPPORTS COOLING CAP.
UNIT SIZE Rinnai Corporation Hydronic Furnace (37AHB) Manual TAP 4 (L) TAP 3 (ML) TAP 2 (MH) TAP 1 (H) ECM SPEED TAP O EWT ( F) 160 150 140 160 150 140 160 150 140 130 3.0 160 150 140 130 120 AHB90 + R98LSi(e)/ASME 3.5 120 AHB90 + R98LSi(e)/ASME 4.0 130 120 AHB90 + R98LSi(e)/ASME 5.0 130 120 AHB90 + R98LSi(e)/ASME SUPPORTS COOLING CAP.
Accessories 6. Flow Sensor FIELD SUPPLIED ACCESSORIES 1. Humidifier (HUM) Connect an auxiliary 2.5 FLA, 2.5 LRA @ 115 VAC max Humidifier (if required). Connections are made via the “HUM” quick connects. The humidifier output is on whenever a heating demand is being satisfied. The contacts of this output are isolated to allow field personnel to apply 24 VAC or 115 VAC to one terminal and the humidifier load to the other. 2.
37AHB045 Wiring Diagram Figure 27 60 Rinnai Corporation Hydronic Furnace (37AHB) Manual
37AHB060 Wiring Diagram Figure 28 Rinnai Corporation Hydronic Furnace (37AHB) Manual 61
37AHB075 and 37AHB090 Wiring Diagram Figure 29 62 Rinnai Corporation Hydronic Furnace (37AHB) Manual
Parts List Figure 30: Unit Assembly UNIT ASSEMBLY 1 2 608000025 Complete Blower 608000026 Assembly-See 608000027 blower assembly section for individual parts 608000028 609000018 3 607000011 4 607000010 5 6 7 8 Filter Retention Wire 3/4” Pump Adaptor Set Hydronic Pump X 9 X X X X X 2 2 2 X X X X X 609000052 High Voltage Compartment Cover X X X X X 10 2 2 Control Panel Front Cover X 11 12 X 13 X X Lower Front Fill X X X Lower Front Service Door 14 X X X 15 609000
Parts List 605000012 (size 075) 605000013 (size 090) Description 605000011 (sizes 045, 060) 1 2 3 4 Part Number Balloon Number CONTROL PANEL X X X X X X X X X X X X 605000010 Control Board 605000015 Transformer 605000014 Door Switch 605000018 Pump Capacitor 5 1 1 6 2 3 4 5 7 8 6 7 8 609000053 609000054 609000055 609000056 609000057 608000017 608000018 608000019 608000020 609000058 605000025 605000027 605000028 609000059 608000021 608000022 608000023 608000024 605000030 605000031 Figure 32
Limited Warranty Warranty Information The installer is responsible for the correct installation of your Hydronic Furnace. Please complete the information below to keep for your records: Purchased from: _________________________________________________________________ Address: _____________________________ Phone: _________________________________ _____________________________ Date of Purchase: __________________________________ Model No.: ________________________________________ Serial No.
Limited Warranty What will Rinnai do? Rinnai will repair or replace the covered product or any part or component that is defective in materials or workmanship as set forth. Labor will only be covered when the furnace is connected to a Rinnai tankless water heater. Rinnai will pay reasonable labor charges associated with the repair or replacement of any such part or component. All repair parts must be genuine Rinnai parts.
Notes Rinnai Corporation Hydronic Furnace (37AHB) Manual 67
