Residential Tankless Water Heaters Installation Start-Up Maintenance Parts Warranty WGRT**150 / WGRT**199 Models ** “NG” Denotes Natural Gas; “LP” Denotes Propane Gas This manual must only be used by a qualified installer / service technician. Read all instructions in this manual before installing. Perform steps in the given order. Failure to do so could result in substantial property damage, severe personal injury, or death.
WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death. t Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. WHAT TO DO IF YOU SMELL GAS t Do not try to light any appliance. t Do not touch any electrical switch; do not use any phone in your building. t Immediately call your gas supplier from a neighbor’s phone.
Foreword For the Installer This manual is intended to be used in conjunction with other literature provided with the water heater. This includes all related control information. It is important that this manual, all other documents included in this system, and additional publications including the Code for the Installation of Heat Producing Appliances and National Fuel Gas Code - ANSI Z223.1 (latest versions), be reviewed in their entirety before beginning any work.
Table of Contents Part 1 - General Safety Information A. Operation and Installation Warnings B. Improper Combustion C. Gas D. When Servicing the Water Heating System E. Water Chemistry Requirements F. Freeze Protection G. Water Temperature Adjustment and Scalding H. High Elevation Installations Part 2 - Before You Start A. What’s in the Box B. Optional Equipment Part 3 - Prepare the Water Heater Installation A. Locating the Water Heater B. Leveling C. Clearances for Service Access D.
Improper venting can cause a build-up of carbon monoxide. Breathing carbon monoxide can result in brain damage or death. DO NOT operate the water heater unless it is properly vented to the outside and has an adequate fresh air supply for safe operation. Inspect the exterior exhaust gas outlet port and fresh air inlet port on a regular basis to ensure they are functioning properly. A concentration of carbon monoxide as small as .04% (400 parts per million) in the air can be fatal.
This water heater has been designed to heat potable water ONLY. Using this water heater to heat non-potable fluid WILL VOID product warranty, and could result in property damage, personal injury, or death. Do not use this water heater for anything other than its intended purpose (as described in this manual). Doing so could result in property damage and WILL VOID product warranty. B. Improper Combustion Do not obstruct the flow of combustion and ventilating air.
G. Water Temperature Adjustment and Scalding This water heater can deliver scalding water. Be careful whenever using hot water to avoid scalding injury. Certain appliances such as dishwashers and automatic clothes washers may require increased water temperatures. By setting the thermostat on this heater to obtain the increased water temperature required by these appliances you may create the potential for scald injury. H.
Part 2 - Before You Start Open the shipping crate of the water heater. UNCRATING THE WATER HEATER - Any claims for damage or shortage in shipment must be filed immediately against the transportation company by the consignee. A.
Part 3 - Prepare the Water Heater Installation Remove all sides of the shipping crate to allow the heater to be moved into its installation location. COLD WEATHER HANDLING - If the water heater has been stored in a very cold location (BELOW 0oF) before installation, handle with care until the components come to room temperature. Failure to do so could result in damage to the water heater. Carefully consider installation when determining heater location.
B. Leveling D. Residential Garage and Closet Installations In order for the condensate to properly flow out of the collection system, the area where you locate the heater must be level. Location must also fully support the weight of the filled water heater. C. Clearances for Service Access Check with your local Authority Having Jurisdiction for requirements when installing the water heater in a garage or closet. Please read the entire manual before attempting installation.
Different vent terminals can be used to simplify and eliminate multiple penetrations in the building structure (see Optional Equipment in Venting Section). The exhaust vent and intake piping lengths, routing, and termination methods must all comply with the methods and limits given in the Venting Section, this manual. When installing a combustion air intake from outdoors, care must be taken to utilize uncontaminated combustion air. To prevent combustion air contamination, see Table 7.
Products to Avoid Areas Likely to Have Contaminants Spray cans containing fluorocarbons Dry cleaning / laundry areas and establishments Permanent wave solutions Swimming pools Chlorinated waxes / cleaners Metal fabrication plants Chlorine-based swimming pool chemicals Beauty shops Calcium chloride used for thawing Refrigeration repair shops Sodium chloride used for water softening Photo processing plants Refrigerant leaks Auto body shops Paint or varnish removers Plastic manufacturing pl
I. Technical Specifications Model 150 199 Installation Indoor, Wall Hung, Fully Condensing Minimum / Maximum Input (Btu/Hr) Hot Water Capacity 15,000 / 150,000 19,900 / 199,000 35oF Rise 8.1 GPM 11 GPM 45oF Rise 6.3 GPM 8.5 GPM 77oF Rise 3.7 GPM 5 GPM Flue System Category IV, Sealed Combustion Direct Vent, Power Vent Vent Run 2” (50 feet), 3” (100 feet), Schedule 40 PVC, CPVC, PP Weight (lbs) 64 88 Energy Factor (EF) 0.95 0.98 Uniform Energy Factor (UEF) 0.93 0.
Figure 2 - 150 Model Dimensions Description Diameter A Exhaust Outlet Adapter 2” B Air Intake Adapter 2” C Gas Inlet Adapter 3/4” NPT D DHW Outlet Adapter 3/4” NPT E DHW Inlet Adapter 3/4” NPT F Condensate Adapter 1/2” NPT G DHW Inlet Filter N/A Table 9 - 150 Model Adapter Specifications How the Water Heater Operates Condensing technology intelligently delivers water heating while maximizing efficiency.
Figure 3 - 150 Model Components Number Component Description Number Component Description Number Component Description 1 Exhaust Vent Adapter 10 Mixing Valve 19 Secondary Heat Exchanger Assembly 2 Air Inlet Pipe 11 DHW Outlet Adapter 20 Gas Valve 3 Ignition Transformer 12 Condensate Trap 21 Burner Case 4 Igniter 13 Gas Inlet Adapter 22 AGM (Air Gas Mixer) 5 Flame Detection Sensor 14 Cold Water Inlet 23 BLDC Fan 6 Hot Water Outlet 15 Water Adjustment Valve 24 Air I
Figure 4 - 199 Model Dimensions Description Diameter A Exhaust Outlet Adapter 3” B Air Intake Adapter 3” C Gas Inlet Adapter 3/4” NPT D DHW Outlet Adapter 3/4” NPT E DHW Inlet Adapter 3/4” NPT F Condensate Adapter 1/2” NPT G DHW Inlet Filter N/A Table 11 - 199 Model Adapter Specifications Field Wiring and Power Switch – Each water heater is supplied with a power switch to cut off power. The water heater is also equipped with two front mounted terminal strips.
Figure 5 - 199 Model Components Number Component Description Number Component Description Number Component Description 1 Exhaust Vent Adapter 13 Water Adjustment Valve 25 Freeze Protector 2 Air Inlet Pipe 14 Main Controller 26 DHW Outlet Adapter Secondary Heat Exchanger Assembly 27 Condensate Trap 3 AGM (Air Gas Mixer) 15 4 Ignition Transformer 16 Gas Inlet Pipe 1 28 Cold Water Inlet Adapter 5 Igniter 17 Flame Sight Glass 29 Cold Water Inlet Filter 6 Flame Detection
Positioning the Water Heater on the Wall 1. Attach the wall bracket on the location where you want to install the water heater. Ensure it is level and on stud (16” centers) before proceeding. 2. Mark the four drill holes with a pencil or marker. Remove the wall bracket. 3. Drill four (4) holes using a 5/32 drill bit at the marked hole locations. 4. Mount the wall bracket to the wall with the four (4) included anchor bolts. Ensure the mounted bracket is level. See Figure 6A. 5.
2. The expansion tank must be located as shown in Applications, this manual, or following recognized design methods. See expansion tank manufacturer’s instructions for details. D. Piping the Water Heater Use at least the MINIMUM pipe size for all water heater loop piping This is to avoid the possibility of inadequate flow through the water heater. Using less than the required minimum pipe size and piping could result in system problems, property damage, and premature water heater failure.
Figure 8 - DHW Piping, Single Water Heater Figure 9 - DHW Piping, Single Water Heater with Recirculation Figure 10 - DHW Piping with Storage Tank Figure 11 - DHW Piping with Storage Tank and Recirculation NOTES: 1. Minimum pipe size should match connection size. Upsize pipe accordingly if greater flow is required. 2. A thermal expansion tank suitable for potable water must be sized and installed within this piping system between the backflow preventer and the cold water inlet. 3.
Figure 12 - Cascaded Water Heaters Figure 13 - Cascade Water Heaters with Recirculation NOTES: 1. Minimum pipe size should match connection size. Upsize pipe accordingly if greater flow is required. 2. A thermal expansion tank suitable for potable water must be sized and installed within this piping system between the backflow preventer and the cold water inlet. 3. All circulators should have an integral flow check. 4.
Figure 14 - Cascaded Water Heaters with Storage Tank Figure 15 - Cascaded Water Heaters with Storage Tank and Recirculation NOTES: 1. Minimum pipe size should match connection size. Upsize pipe accordingly if greater flow is required. 2. A thermal expansion tank suitable for potable water must be sized and installed within this piping system between the backflow preventer and the cold water inlet. 3. All circulators should have an integral flow check. 4.
Figure 16 - Water Heater with Air Handler - NOTE: There is a Built-In Flow Check in the Air Handler Loop NOTES: 1. Minimum pipe size should match connection size. Upsize pipe accordingly if greater flow is required. 2. A thermal expansion tank suitable for potable water must be sized and installed within this piping system between the backflow preventer and the cold water inlet. 3. All circulators should have an integral flow check. 4.
F. Circulator Sizing Figure 17 - Pressure Drop through the Heat Exchanger ∆T = 77oF Number of Units ∆T = 45oF ∆T = 35oF Flow Rate (GPM) Water Velocity (ft/s) Pipe Dia. (In.) Flow Rate (GPM) Water Velocity (ft/s) Pipe Dia. (In.) Flow Rate (GPM) Water Velocity (ft/s) Pipe Dia. (In.) 1 5 3.75 3/4 9 3.61 1 11 4.64 1 2 10 4.22 1 18 3.21 23 4.13 1 1/2 3 16 4.05 1 1/4 27 4.82 34 3.48 4 21 3.75 35 3.61 45 4.64 5 26 4.69 44 4.52 57 3.72 6 31 3.17 53 3.
required. DO NOT operate this water heater before the supplied pressure relief valve is installed with sufficient relieving capacity in accordance with the rating plate on the water heater. Pressure relief valves must be installed as close to the water heater as possible. No other valves should be placed between the pressure relief valve and the appliance. DO NOT install a relief valve with a pressure rating greater than 150 psi. This is the maximum allowable relief valve setting for this water heater.
1. Installation should be made in accordance with the regulations of the Authority Having Jurisdiction, local code authorities, and utility companies which pertain to this type of water heating equipment. 2. Install the venting system in accordance with these instructions and with the National Fuel Gas Code, ANSI Z223.1/NFPA 54, CAN/ CGA B149, and / or applicable provisions of local building codes. 3.
DO NOT mix components from different venting systems. The vent system could fail, causing leakage of flue products into the living space. Use only the approved pipe and fitting materials, and primer and cement specifically designed for the material used, as listed in the above table. Failure to do so could result in property damage, serious injury, or death. t DO NOT insulate the first three (3) linear feet of the exhaust vent run.
D. Exhaust Vent and Intake Pipe Location INSIDE CORNER DETAIL G E A H E B B E OPERABLE C FIXED CLOSED FIXED CLOSED D E E I E OPERABLE F M I B E K E E E I B J A K I B L LP-179-CC 03/28/17 E Exhaust Vent Terminal I Intake Pipe Terminal Area Where Intake Terminal Is Not Permitted Figure 19 - Exit Terminals for Direct Vent Systems - ANSI Z223.1 / NFPA 54 for US and CAN/CSA B149.
E. Exhaust Vent and Intake Pipe Sizing 1. The exhaust vent and intake pipe size is 2” for 150 models, and 3” for 199 models. 2. The total equivalent length of 2” exhaust vent and intake pipe should not exceed fifty (50) feet; 3” exhaust vent and intake pipe should not exceed one hundred (100) feet. a. The equivalent length of elbows, tees, and other fittings are listed in the Friction Loss Table. b.
minimum of 4 foot intervals to prevent sagging of the pipe where condensate may form. 13. Do not use the heater to support any piping. 14. A screened straight coupling is provided with the heater for use as an outside exhaust termination. 15. A screened inlet air tee is provided with the heater to be used as an outside intake termination. 16.
Two Pipe Sidewall Venting with Elbow (Intake) and Coupling (Exhaust) EXTERIOR WALL 1" MIN. 12" MIN.
EXHAUST A AIR INTAKE B FRONT VIEW 24.00 C Exhaust D EXHAUST Intake E AIR INTAKE LP-325-PP 03/31/11 SIDE VIEW F LP-325-OO 02/04/15 Figure 24 - Horizontal (Snorkel) Venting NOTES: A. For every 1” of overhang, the exhaust vent must be located 1” vertical below overhang (overhang means top of building structure and not two adjacent walls [corner of building]). B. Typical installations require 12” minimum separation between bottom of exhaust outlet and top of air intake. C.
2. Venting Through an Existing System This heater may be vented through an existing unused vent system. The inner diameter of the existing vent system is utilized for the combustion air source. Two methods have been approved for such venting: Concentric Venting Through an Existing System and Venting as a Chase. concentric vent kits. Concentric venting through an existing system must run vertically through the roof. See Table 19 for proper minimum vent sizing.
3. Power Venting, Indoor Combustion Air in Confined or Unconfined Space This heater requires fresh, uncontaminated air for safe operation considered part of the space. and must be installed in a mechanical room where there is adequate Confined space is space with volume less than 50 cubic feet per combustion and ventilating air. NOTE: To prevent combustion air 1,000 Btu/hour (4.8 cubic meters per kW) of the total input rating of contamination, see Table 7.
I. Common Vent Piping - 199 Model Only! DO NOT ATTEMPT to common vent 150 model water heaters! Doing so will result in property damage, severe personal injury, or death. Common Vented units must be direct vented, with an exhaust vent and intake air pipe vented to the outdoors. DO NOT power vent Common Vented units! Doing so will result in property damage, severe personal injury, or death. These units can be common vented.
2. Recommended Exhaust Pipe Transitions Figure 29 - Recommended Exhaust Pipe Transitions 3. Two (2) Pipe Common Direct Vent Systems DO NOT ATTEMPT to common vent 150 model water heaters! Doing so will result in property damage, severe personal injury, or death. Common Vented units must be direct vented, with an exhaust vent and intake air pipe vented to the outdoors. DO NOT power vent Common Vented units! Doing so will result in property damage, severe personal injury, or death.
Figure 30 - Common Vented Units – Unbalanced Venting Figure 31 - Common Vented Units – Roof Venting All vent pipes must be glued, properly supported, and the exhaust pitched a minimum of 1/4” per foot back to the heater to allow drainage of condensate. When placing support brackets on vent piping, the first bracket must be within 1 foot of the water heater and the balance of 4 foot intervals on the vent pipe.