MODELS (A)JWSH100150 THRU (A)JWSH100250 SERIES 100 AND 101 COMMERCIAL GAS WATER HEATER GAS-FIRED POWER BURNER FOR DOMESTIC HOT WATER • INSTALLATION • OPERATION • SERVICE • MAINTENANCE • LIMITED WARRANTY WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death. – Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
MODELS (A)JWSH100150 THRU (A)JWSH100250 ROUGH-IN-DIMENSIONS GAS VALVE PIPING (A)JWSH100150, (A)JWSH100199, & (A)JWSH100250 3/4" NPT Table 1. RECOVERY CAPACITIES - NATURAL GAS / L.P. Approx. Gallon Capacity 100 100 100 Model Input BTU/Hr. Gas Usage (A)JWSH100150 (A)JWSH100199 (A)JWSH100250 150,000 199,900 250,000 nat/lp nat/lp nat/lp Model Gas kW-Hr Liter Usage Approx.
TABLE OF CONTENTS PAGE ROUGH-IN DIMENSIONS.................................................................. FOREWORD...................................................................................... FEATURES......................................................................................... Water Temperature Control............................................................ High Limit Switch (E.C.O.).............................................................
temperature be set for the lowest temperature which satisfies your hot water needs. This will also provide the most energy efficient operation of the water heater and minimize scale formation. DISHWASHING MACHINE REQUIREMENT All dishwashing machines meeting the National Sanitation Foundation requirements are designed to operate with water flow pressures between 15 and 25 pounds per square inch (103 Kpa and 173 Kpa).
LOCATING THE HEATER WARNING WARNING This water heater is a condensing unit and requires a drain to be located in close proximity to allow the condensate to drain safely. The condensate drains from the unit at the exhaust elbow located at the bottom of the unit. Note: It is important that the condensate hose not be elevated above the exhaust elbow (see Figure 3). The condensate build-up will block the exhaust outlet, which will cause improper operation.
HARD WATER If the confined space is within a building of tight construction, air for combustion and ventilation must be obtained from outdoors. When directly communicating with the outdoors through vertical ducts, two permanent openings, located in the above manner, shall be provided. Each opening shall have a free area of not less than one square inch (6.5 cm²) per 4000 Btuh of the total input of all appliances in the enclosure.
CAUTION TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN WINDY/COLD AREAS, THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED. CANADIAN POWER VENT FIGURE 5. CANADIAN DIRECT VENT FIGURE 6.
IMPORTANT NOTE: TO PREVENT EXHAUSTING PRODUCTS FROM CIRCULATING TO THE AIR INTAKE IN WINDY/COLD AREAS, THE MA XIMUM PRACTICAL DISTANCE BETWEEN THESE TWO TERMINALS IS RECOMMENDED. The vent system must terminate so that proper clearances are maintained as cited in local codes or the current editions of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 or the Natural Gas and Propane Installation Code, CAN/CSA-B149.1. FOR ALL MODELS Installation of this water heater must comply with CAN/CSA B149.
VERTICAL VENT TERMINAL INSTALLATION 5. Glue the intake vent terminal to the section of the pipe. 6. Slide the wall plate over the pipe to stop against intake vent terminal. IMPORTANT 7. Place a bead of caulking (not supplied) around the gap between the pipe and the wall. Place some of the caulking on the back of the plate to hold it against the wall after installation. WHEN TERMINATING THROUGH A ROOF, THE FOLLOWING SPECIFICATIONS PERTAINING TO TERMINAL LOCATION MUST BE FOLLOWED. 8.
INSTALLATION OF VENT SYSTEM NOTE: for Water Heaters in locations with high ambient temperatures (above 100°F or 38°C) and/or insufficient dilution air, it is recommended that CPVC pipe and fittings marked ULC S636 compliant (MUST USE SUPPLIED VENT TERMINAL) be used. WARNING THE OPTIONAL INTAKE VENTING ARRANGEMENT AND THE EXHAUST VENTING ARRANGEMENT MUST BE INSTALLED TO RUN DIRECTLY TO THE OUTDOORS AND NOT IN ANY WAY BE CONNECTED TO ANOTHER VENTING SYSTEM (I.E. FURNACE, DRYERS OR SPACE HEATERS).
CONTROLS AND SWITCHES LOW GAS PRESSURE SWITCH All models are provided with four pressure switches. These switches are essential to the safe and proper operation of the unit. All switches are wired in series. The controller is set up to shut the unit down whenever there is a failure of any of the switches. It is important to understand the purpose of each switch. The Low Gas Switch (LGS) is a single-pole, normally open pressure switch that will close its contacts when a rising pressure of 5.0 in. (1.
WARNING THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER THAN 10.5" (2.59 KPa) WATER COLUMN SUPPLY GAS PRESSURE. HIGHER GAS SUPPLY PRESSURES REQUIRE SUPPLEMENTAL REDUCING SERVICE REGULATION. EXPOSURE TO HIGHER GAS SUPPLY PRESSURE MAY CAUSE DAMAGE TO THE GAS CONTROLS WHICH COULD RESULT IN FIRE OR EXPLOSION. IF OVERPRESSURE HAS OCCURRED SUCH AS THROUGH IMPROPER TESTING OF GAS LINES OR EMERGENCY MALFUNCTION OF THE SUPPLY SYSTEM THE GAS VALVE MUST BE CHECKED FOR SAFE OPERATION.
RELIEF VALVE DISCONNECT THE APPLIANCE AND ITS MANUAL GAS SHUTOFF VALVE FROM THE GAS SUPPLY PIPING SYSTEM DURING ANY SUPPLY PRESSURE TESTING EXCEEDING 1/2 PSIG (3.45Kpa). GAS SUPPLY LINE MUST BE CAPPED WHEN DISCONNECTED FROM THE HEATER. FOR TEST PRESSURES OF 1/2 PSIG (3.45Kpa) OR LESS, THE APPLIANCE NEED NOT BE DISCONNECTED, BUT MUST BE ISOLATED FROM THE SUPPLY PRESSURE TEST BY CLOSING THE MANUAL GAS SHUTOFF VALVE. This heater is equipped with an approved temperature and pressure relief valve.
3. This unit may never be connected to any existing heating system or component(s) previously used with non-potable water heating appliance. THE CONTROLLER TO MALFUNCTION. A HIGH QUALITY POWER CONDITIONER MUST BE INSTALLED IF THE ABOVE CONDITIONS EXIST. MALFUNCTIONS CAUSED BY A POOR ELECTRICAL SUPPLY ARE NOT COVERED UNDER YOUR WARRANTY. 4. When the system requires water for space heating at temperatures higher than required for domestic water purposes, a tempering valve must be installed.
USING THE ELECTRONIC CONTROLLER 1. Overview Interaction with the water heater controller is done through an up, a down, and three operation buttons. These buttons are illustrated to the right. Operation of the three lower buttons is defined immediately above them on the screen. The [UP] and [DN] buttons are used to navigate through the menus and make adjustments to the water heater.
2. Operating States In the main desktop screen, there are some specific Operating States that are indicated on the status line. These are summarized below: 3. Adjusting the Operating Set Point ACTION: Press Change then use the UP and DOWN buttons to change the Set Point. The Operating Set Point of this water heater determines the regulated temperature for the water in the tank. This parameter is adjusted in the Temperature menu.
4. Changing the Display Units There are two types of conditions that can occur during operation. These are Warnings and Faults: The display interface to the heater has the option of selecting between degrees Fahrenheit and degrees Celsius for temperature displays. This can be found in the “Display Settings” menu. Also in this menu, you may adjust how the backlight operates and the contrast of the LCD screen.
7. Viewing the Fault History ACTION: To get to the current fault information screen, press Menu. The controller for this water heater will store a history of ten of the last Fault and Warning conditions that occurred. This is stored in the Fault History. Along with all the information about the fault, including a estimate time of when the fault occurred, information regarding the advanced diagnostics for that fault can be accessed at any time. DISPLAY: ACTION: Press the DOWN button for more information.
OPERATING INSTRUCTIONS 5. Check the vent system seams and joints and ensure that there is no discharge of flue products into the room. IMPORTANT IT IS RECOMMENDED THAT A QUALIFIED SERVICE TECHNICIAN PERFORM THE INITIAL FIRING OF THE HEATER. AT THIS TIME THE USER SHOULD ASK THE TECHNICIAN ANY QUESTIONS IN REGARD TO THE OPERATION AND MAINTENANCE OF THE UNIT. 6. Check the input rate.
HIGH ALTITUDE INSTALLATIONS WARNING UNDER NO CIRCUMSTANCES SHOULD THE INPUT EXCEED THE RATE SHOWN ON THE HEATER RATING PLATE. OVER FIRING COULD RESULT IN DAMAGE OR SOOTING OF THE HEATER. WARNING THE (A)JWSH100199 AND (A)JWSH100250 HEATERS ARE CERTIFIED FOR USE WITHOUT MODIFICATION FOR ALTITUDES UP TO 10,100 ft. (3078 m). THE (A) JWSH100150 HEATERS ARE CERTIFIED FOR USE WITHOUT MODIFICATION FOR ALTITUDES UP TO 7,700 ft. (2347 m).
FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. OPERATING INSTRUCTIONS TURN OFF GAS TO APPLIANCE (A)JWSH100150 ONLY.
FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. OPERATING OPERATINGINSTRUCTIONS INSTRUCTIONS TURNOFF OFFGAS GASTO TOAPPLIANCE APPLIANCE TURN (A)JWSH100199 & (A)JWSH100250 MODELS ONLY.
FLUSHING 1. Turn off the heater electrical disconnect switch. 2. Open a hot water faucet until the water runs cool and then close the hot water faucet. 3. Open the drain valve and allow water to flow until it runs clean. 4. Close the drain valve when finished flushing. 5. Turn on the heater electrical disconnect switch. DRAINING The heater must be drained if it is to be shut down and exposed to freezing temperatures. Maintenance and service procedures may also require draining the heater. 1.
DRAIN VALVE AND ACCESS PANELS The heaters are equipped with a 3/4" drain valve. to build until the relief valve actuation pressure is equaled. Then, the relief valve will open, allowing some water to escape, slightly lowering the pressure. An access panel covers the cleanout opening in the tank which is sealed by a gasket and cover, figure 25. Contact your water supplier or local plumbing inspector on how to control this situation.
INSTALLATION DIAGRAMS ONE TEMPERATURE - ONE HEATER VERTICAL STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACKFLOW PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER SYSTEM MUST BE PROVIDED NOTE: CONNECT RETURN L I N E F R O M H O T WAT E R CIRCULATING LOOP (IF USED) TO COLD WATER INLET LINE.
TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE WITH OR WITHOUT BUILDING RECIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 3. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.
TWO TEMPERATURE - TWO HEATERS HIGH TEMPERATURE WITH OR WITHOUT BUILDING RECIRCULATION CAUTION: If the plumbing requires the use of pipes with dissimilar material (for example, steel and copper), use dielectric unions to prevent an electro-galvanic action between the piping components with dissimilar materials.
TWO TEMPERATURE - TWO HEATERS (ONE PRE-HEATER/ONE BOOSTER HEATER) WITH OR WITHOUT BUILDING RECIRCULATION * PIPE RELIEF VALVE TO OPEN DRAIN DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 3. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. ** 140°F (60°C) TO 150°F (66°C) SHOULD BE MAXIMUM WATER TEMPERATURE MAINTAINED IN THE PRE-HEATERS.
TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE WITH RECIRCULATION OF SANITIZING LOOP CAUTION: If the plumbing requires the use of pipes with dissimilar material (for example, steel and copper), use dielectric unions to prevent an electro-galvanic action between the piping components with dissimilar materials. NOTE 1: TOGGLE SWITCH CONTROLS 180°F (82°C) WATER CIRCULATION. INSTALL ON OR CLOSE TO DISHWASHER.
MANIFOLD KITS Precision cut type “L” all copper manifold kits assure water flow balance of all units. Without this balance, the full water heating and storage potential of the system cannot be achieved. Plus, the units with the higher water flow may have a shortened life. Dimensions shown are for minimum space occupied by the water heaters assemblies. Space for the venting system and unit servicing must be added.
CHECKLIST AND SERVICE INFORMATION 2. Some of the electrical components of the water heater make sounds which are normal. IMPORTANT The installer may be able to observe and correct certain problems which might arise when the unit is put into operation or when it is re-fired after a prolonged shutdown. HOWEVER, it is recommended that only qualified servicemen, using appropriate test equipment, be allowed to service the heater. • Contacts click or snap as the heater starts and stops.
MOTOR WILL NOT RUN MOTOR RUNS, BURNER LIGHTS MOMENTARILY, THEN LOCKS OUT 1. Confirm 120V AC to the controller. Also, to verify correct polarity, check for 120 V AC between hot supply and ground. 1. Reset the appliance two more times to ensure that all of the air has been purged from the gas line. If there is no voltage, check for a loose connection where it connects to the controller. 2.
MODELS (A)JWSH100150 thru (A)JWSH100250 LIMITED WARRANTY GSW Water Heating, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater. 1. THE TANK If the glass-lined tank in this water heater shall prove to the satisfaction of the warrantor to have leaked due to natural corrosion from potable water therein, during the first THREE years after initial installation, the warrantor will supply a complete new John Wood water heater of equivalent size and current model.
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599 Hill Street West Fergus, ON Canada N1M 2X1
