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GAS-FIRED COMMERCIAL WATER HEATER
A Spanish language version of these instructions is available by
contacting the company listed on the rating plate.
La versión espãnola de estas instructiones se puede obtener al
escrible a la fábrica cuyo nombre aparece en la placa de
especificaciones.
WARNING:
followed exactly, a fire or explosion may result causing
property damage, personal injury or death.
Do not store or use gasoline or other flammable,
combustible, or corrosive vapors and liquids in the
vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
•
Do not try to light any appliance.
•
Do not touch any electrical switch; do not use any
phone in your building.
•
Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.
•
If you cannot reach your gas supplier, call the fire
department.
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
For safety, convenience, and best performance, we recommend
this water heater be installed and serviced by a plumbing
professional.
INSTALLATION &
OPERATING
INSTRUCTION MANUAL
If the information in these instructions is not
FOR YOUR SAFETY
238-39387-00H REV 7/00
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Summary of Contents for American Water Heater GAS-FIRED COMMERCIAL WATER HEATER
- Page 1 Index GAS-FIRED COMMERCIAL WATER HEATER A Spanish language version of these instructions is available by contacting the company listed on the rating plate. La versión espãnola de estas instructiones se puede obtener al escrible a la fábrica cuyo nombre aparece en la placa de especificaciones.
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Page 2: Table Of Contents
GENERAL INFORMATION... INSTALLATION..Locating The Water Heater ... Minimum Clearances... Venting... 14 Combustion Air Supply... 16 Water Connections ... 18 Gas Connections ... 21 GENERAL OPERATION... 22 Wiring Diagrams Standard Pilot Wiring Diagram..23 Spark Ignition Wiring Diagram..24 Lighting and Shutdown Instructions Standard Pilot Models. -
Page 3: General Information
Index GENERAL INFORMATION This gas-fired water heater is design certified by the American Gas Association Laboratories under the applicable American National Standard, Z21.10.1 or Z21.10.3 (as indicated on the rating plate), available from the American Gas Association, 1515 Wilson Blvd., Arlington, VA 22209. The warranty for this water heater is in effect only when the water heater is installed, adjusted, and operated in accordance with these Installation and Operating Instructions. - Page 4 Index Incorrect operation of this appliance may create a hazard to life and property and will nullify the warranty. Do not store or use gasoline or other flammable, combustible, or corrosive vapors and liquids in the vicinity of this or any other appliance.
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Page 5: Installation
Index Locating The Water Heater Water heaters are heat producing appliances. To avoid damage or injury there shall be no materials stored against the water heater and proper care shall be taken to avoid unnecessary contact (especially by children) with the water heater components. - Page 6 Index Installation (Locating The Water Heater) continued- Water heater corrosion and component failure can be caused by the heating and breakdown of airborne chemical vapors. Examples of some typical compounds that are potentially corrosive are: spray can propellants, cleaning solvents, refrigerator and air conditioning refrigerants, swimming pool chemicals, calcium and sodium chloride, waxes and process chemicals.
- Page 7 Index Installation (Locating The Water Heater) continued- DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU ARE NOT CERTAIN OF THE FOLLOWING: • Liquefied petroleum gases/propane gas and natural gas have an odorant added by the gas supplier that aids in detection of the gas. •...
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Page 8: Minimum Clearances
Index Installation continued- Minimum Clearances Failure to adhere to these installation and operating instructions may create a hazard to life and property and will nullify the warranty. This installation shall allow access to the front of the water heater and adequate clearance shall be provided for servicing and operating this water heater. - Page 9 Index Non-Flue Damper Models and Flue Damper Models Model Description Capacity Input (BTU/hr) (GAL) Nat. 199,999 199,999 74.88 250,000 225,000 74.88 270,000 250,000 74.88 300,000 300,000 75.44 399,999 375,000 71.06 450,000 425,000 69.03 505,000 475,000 69.03 Model Description Capacity Input (kW/hr) (Litres) Nat.
- Page 10 Index Model Designation Capacity Input (GAL) (BTU/hr) 370,000 399,999 (NAT ONLY) 300,000 425,000 505,000 Model Designation Capacity Input (Litres) (kW/hr) 246.1 108.5 246.1 117.3 (NAT ONLY) 283.9 88.0 302.8 124.6 302.8 148.0 Installation (Minimum Clearances) continued- Figure 2 Non-Flue Damper Models (in.) (in.) (in.)
- Page 11 Index Model Designation Capacity Input (GAL) (BTU/hr) 370,000 399,999 (NAT ONLY) 300,000 425,000 505,000 Model Designation Capacity Input (Litres) (kW/hr) 246.1 108.5 246.1 117.3 (NAT ONLY) 283.9 88.0 302.8 124.6 302.8 148.0 Flue Damper Models and Non-Flue Damper Models Model Designation Capacity Input (GAL)
- Page 12 Index Model Designation Capacity Input (GAL) (BTU/hr) (in.) 180,000 70.13 199,999 70.13 (235,000 LP) 250,000 70.13 (235,000 LP) 199,999 81.13 250,000 82.88 (235,000 LP) 199,999 75.50 250,000 75.50 Model Designation Capacity Input (Liters) (kW/hr) 302.8 52.8 1.79 302.8 58.7 1.79 (68.9 LP) 302.8 73.3...
- Page 13 Index Flue Damper Models (Figure 4) Model Designation Capacity Input (GAL) (BTU/HR) (in.) 180,000 71.88 199,999 71.88 (235,000 LP) 250,000 71.88 (235,000 LP) 199,999 82.88 250,000 82.88 (235,000 LP) 199,999 75.50 250,000 75.50 Model Designation Capacity Input (Liters) (kW/hr) 302.8 52.8 1.83 302.8...
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Page 14: Venting
Index Venting The vent system must be installed properly. Failure to properly install the vent system could result in property damage, personal injury, or death. This water heater has been shipped with a draft diverter for which it was designed with reference to the horizontal and vertical planes. If removed, the draft diverter shall be replaced in the same position and secured to the jacket top by the screws with which it was installed. -
Page 15: Combustion Air Supply
Index 5. Connect the damper wiring plug to the connector on the side of the water heater. Note: The plug and connector can only be engaged one way (polarized). 6. The Lighting and Operating instructions are outlined beginning on page 25. The damper must be in the open position when the water heater main burner is operating (the arrow on the damper plate is in the “up”... - Page 16 Index Liquefied petroleum gases/propane gas are heavier than air and will remain at floor level if there is a leak. Basements, crawl spaces, closets and areas below ground level will serve as pockets for accumulation of leaking gas. Before lighting, smell all around the appliance area for gas. Be sure to smell next to the floor.
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Page 17: Water Connections
Index 2. If the openings communicate with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 in. (2.54cm /0.59kW) per hour of the total rating of all gas appliances in the enclosure. 3. If the openings communicate directly with the outdoors or through vertical ducts with the outdoors, each opening shall have a minimum free area of 1 in. -
Page 18: Water Connections
Index Note: BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE THE MAIN WATER SUPPLY VALVE. After shutting off the main water supply, open a faucet to relieve the water line pressure to prevent any water from leaking out of the pipes while making the water connections to the water heater. - Page 19 Index WARNING For protection against excessive temperatures and pressure, install temperature and pressure protective equipment required by local codes, but not less than a combination temperature and pressure relief valve certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment or materials as meeting the requirements of the Standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANS Z21.22 and the Standard CAN1-4.4 Temperature, Pressure, Temperature and Pressure...
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Page 20: Gas Connections
Index Hydrogen gas can be produced in an operating water heater that has not had water drawn from the tank for a long period of time (generally two weeks or more). Hydrogen gas is extremely flammable. To prevent the possibility of injury under these conditions, we recommend the hot water faucet to be open for several minutes at the kitchen sink before you use any electrical appliance which is connected to the hot water system. -
Page 21: General Operation
Index The gas supply lines must meet all requirements of the National Fuel Gas Code (ANSI Z223.1-Latest Edition), or in Canada CAN/CGA B149.1 Natural Gas Installation Code (Latest Edition) or CAN/CGA B149.2 Propane Installation Code (Latest Edition). The minimum permissible gas supply pressure for the purpose of input adjustment is one (1.0) inch (0.25 kPa) water column above the operating manifold pressure. - Page 22 Index Water heaters are heat producing appliances. To avoid damage or injury there shall be no materials stored against the water heater or vent-air intake system, and proper care shall be taken to avoid unnecessary contact (especially by children) with the water heater and vent-air intake system. UNDER NO CIRCUMSTANCES SHALL FLAMMABLE MATERIALS, SUCH AS GASOLINE OR PAINT THINNER BE USED OR STORED IN THE VICINITY OF THIS WATER HEATER OR IN ANY LOCATION FROM...
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Page 23: Spark Ignition Wiring Diagram
Index General Operation (Spark Ignition Wiring Diagram) continued-... -
Page 24: Lighting And Shutdown Instructions
Index Lighting And Shutdown Instructions... -
Page 25: Standard Pilot Models
Index Standard Pilot Models General Operation (Lighting and Shutdown) continued-... -
Page 26: Spark Ignition Models
Index Spark Ignition Models General Operation continued-... -
Page 27: Temperature Adjustment
Index Temperature Adjustment The temperature selector knob of the thermostat has been adjusted to its lowest setting when shipped from the factory. The detent on the thermostat temperature scale (shown below) is the preferred starting point for setting the temperature control. For energy- efficient operation of your water heater, the suggested initial temperature setting is approximately 130°F (55°C). - Page 28 Index General Operation (Temperature Adjustment) continued- Hotter water increases the risk of scald injury. Scalding may occur within five (5) seconds at a temperature setting of 135°F (57 protect against hot water injury, install an anti-scald tempering valve in the water system. This valve will reduce point of discharge temperature by mixing cold and hot water in branch water lines.
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Page 29: Burner Flame Check
Index General Operation continued- Burner Flame Check At the time of installation and at periodic intervals (about every 3 months), a visual check of the pilot and burner flames should be made to determine if they are burning properly. No adjustment to the air shutter is required for this heater. -
Page 30: Maintenance
Index Water heaters are heat producing appliances. To avoid damage or injury there shall be no materials stored against the water heater or vent system, and proper care shall be taken to avoid unnecessary contact (especially by children) with the water heater and vent system. UNDER NO CIRCUMSTANCES SHALL FLAMMABLE MATERIALS, SUCH AS GASOLINE OR PAINT THINNER BE USED OR STORED IN THE VICINITY OF THIS WATER HEATER, VENT SYSTEM OR IN ANY... - Page 31 Index 5. Annually remove the main burner rack assembly to clean orifices and related parts of any dirt or other foreign material. Inspect the burner ports for obstructions or debris and clean with a wire brush, vacuum, or use a mild detergent solution to clean as needed.
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Page 32: Typical Installation
Index Maintenance (continued)- FOR YOUR SAFETY, DO NOT ATTEMPT REPAIR OF COMBINATION GAS CONTROL, BURNERS OR GAS PIPING. REFER REPAIRS TO A QUALIFIED SERVICE TECHNICIAN. Contact your supplier, plumbing professional or contact the company at the address given on the rating plate of the water heater for replacement parts. Provide the part name as well as the model and serial number(s) of the water heater(s) when ordering parts. -
Page 33: Operating & Troubleshooting Guide
Index Operating and Troubleshooting Guide - Sequence of Normal Operation (Electronic Thermostat with Intermittent Pilot Ignition) - Page 34 Index 1. The electronic thermostat controls the 24-volt circuit to the ignition control. When the thermostat contacts close, a 24-volt circuit is completed from the transformer through the thermostat relay to the ignition control module to initiate the ignition sequence. 2.
- Page 35 Index Test or Condition: Start - Disconnect sensor leads from electronic control module and measure resistance of sensor(s) with ohmmeter Sensors O.K. Disconnect ECO leads and measure resistance with ohmmeter Disconnect potentiometer leads from electronic control module. Measure resistance of potentiometer with ohmmeter.
- Page 36 Index Test or Condition: Result: Are burners operating? If pilot does not light and pilot is not sparking, check to make sure flue damper is in the full open position. Damper opens? YES↓ If damper opens, but pilot does light or spark: Does pilot spark without lighting pilot? Make sure there is sufficient gas pressure at the gas...
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Page 37: Temperature Control Checkout
Index thermostat board, and the heater operates if this wire is jumpered to the “COM” terminal above it, then make the following checks to the thermostat circuit. This procedure also applies if the burners cycle on for short periods, but the water temperature seems low. - Page 38 Index °F 26109 25400 24712 19906 19383 18876 15314 14925 14548 11884 11592 11308 9299 9078 8862 7333 7165 7000 5827 5697 5570 4663 4562 4464 3758 3679 3602 3048 2986 2925 2488 2439 2391 2043 2004 1966 1688 1656 1625 1402 1376...
- Page 39 Index 1. Drafthood 2. Diptube 3. Flue Baffle 4. Cleanout Access (Jacket) Cover 5. Drain Valve 6. Cleanout Cover 6a. Cleanout Cover O-Ring (Not Pictured) 6b. Cleanout Cover Gasket A.S.M.E. (Not Pic) 7. Heat Shield 8. Main Burner Tube(s) 9. Burner Tray 10.
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Page 40: Space Heating
Index SUITABLE FOR WATER (POTABLE) HEATING AND SPACE 1. All piping components connected to this water heater for space heating applications must be suitable for use with potable water. 2. Toxic chemicals, such as those used for boiler treatment, shall not be introduced into potable water used for space heating. - Page 41 Index Suggested Piping Arrangement For Top Connections Suggested Piping Arrangement For Side Connections (If Applicable)
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Page 42: Notes
Index NOTES... - Page 43 NOTES...
- Page 44 NOTES...