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599 Hill Street West Fergus,
ON Canada N1M 2X1
Low Lead Content
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.
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.
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
PRINTED 0814
COMMERCIAL GAS WATER HEATERS
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
Instruction Manual
MODELS JW375T75N-AV
INSTALLATION - OPERATION - SERVICE
- MAINTENANCE - LIMITED WARRANTY
•
For Your Safety
AN ODORANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
1
and JW375T75P-AV
Series 300, 301
CANADIAN MANUAL
Read and understand this instruction
manual and the safety messages
herein before installing, operating or
servicing this water heater.
Failure to follow these instructions and
safety messages could result in death
or serious injury.
This manual must remain with the
water heater.
•
326007-001
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Summary of Contents for John Wood JW375T75N-AV
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Page 1: For Your Safety
Instruction Manual COMMERCIAL GAS WATER HEATERS MODELS JW375T75N-AV and JW375T75P-AV Series 300, 301 INSTALLATION - OPERATION - SERVICE 599 Hill Street West Fergus, - MAINTENANCE - LIMITED WARRANTY ON Canada N1M 2X1 CANADIAN MANUAL Low Lead Content WARNING: If the information in these... -
Page 2: Table Of Contents
TABLE OF CONTENTS SAFE INSTALLATION, USE AND SERVICE...... 3 Fresh Air Openings for Confined Spaces ....13 APPROVALS ..............3 Outdoor Air Through Two Openings ......13 GENERAL SAFETY INFORMATION ........4 Outdoor Air Through One Opening ......13 INTRODUCTION ..............5 Outdoor Air Through Two Horizontal Ducts ....14 Abbreviations Used ............. -
Page 3: Safe Installation, Use And Service
SAFE INSTALLATION, USE AND SERVICE The proper installation, use and servicing of this water heater is extremely important to your safety and the safety of others. Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very important that the meaning of each safety message is understood by you and others who install, use, or service this water heater. This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death. DANGER indicates an imminently hazardous situation which, if not avoided, DANGER... -
Page 4: General Safety Information
GENERAL SAFETY INFORMATION... -
Page 5: Introduction
INTRODUCTION Thank You for purchasing this water heater. Properly installed and the safety rules, the water heater will not operate properly. maintained, it should give you years of trouble free service. It could cause DEATH, SERIOUS BODILY INJURY AND/OR PROPERTY DAMAGE. ABBREVIATIONS USED This manual contains instructions for the installation, operation, and maintenance of the gas-fired water heater. It Abbreviations Found In This Instruction Manual: also contains warnings throughout the manual that you must • UL - Underwriters Laboratories Inc. read and be aware of. All warnings and all instructions are • ANSI - American National Standards Institute essential to the proper operation of the water heater and your • NFPA - National Fire Protection Association safety. Since we cannot put everything on the first few pages, • ASME - American Society of Mechanical Engineers READ THE ENTIRE MANUAL BEFORE ATTEMPTING TO • AHRI - Air-Conditioning, Heating and Refrigeration Institute INSTALL OR OPERATE THE WATER HEATER. -
Page 6: Installation Considerations
INSTALLATION CONSIDERATIONS ROUGH IN DIMENSIONS FIGURE 1. TABLE 1. DIMENSIONS AND RECOVERY RATINGS DIMENSIONS Models Units JW375T75N-AV Inches 61 1/8 58 1/2 29 11/16 26 1/2 15 3/16 14 1/2 1 1/4 11 15/16 JW375T75P-AV 155.25 148.6 75.4 67.3 38.6 10.2 39.4 40.6 30.3 RECOVERY RATINGS Input Approx. -
Page 7: Thermometers
THERMOMETERS (Not Supplied) the structure. For this reason, it is not advisable to install water heater in an attic or upper floor. When such locations cannot be avoided, a Thermometers should be obtained and field installed. suitable metal drain pan should be installed under the water heater. Metal Drain pans are available at your local hardware store. Such a Thermometers are installed in the system as a means of detecting metal drain pan must have a minimum length and width of at least the temperature of the outlet water supply. 2” (51 mm) greater than water heater dimensions and must be piped to an adequate drain. The pan must not restrict combustion air flow. Water heater life depends upon water quality, water pressure and the environment in which the water heater is installed. Water heaters are sometimes installed in locations where leakage may result in property damage, even with the use of a drain pan piped to a drain. However, unanticipated damage can be reduced or prevented by a leak detector or water shut-off device used in conjunction with a piped drain pan. -
Page 8: High Altitude
CLEARANCES used in the same room or area containing a gas water heater or other open flame or spark producing appliance. NOTE: Flammable vapors may be drawn by air currents from other areas of the structure to the appliance. Minimum clearances between the water heater and combustible Also, the water heater must be located and/or protected so it is not construction are 0 inch at the sides and rear, 4” (102 mm) at the subject to physical damage by a moving vehicle. front, and 6” (153 mm) from the vent pipe. Clearance from the top of the jacket is 12” (305 mm) on most models. FIGURE 2. This water heater must not be installed directly on carpeting. Carpeting must be protected by metal or wood panel beneath the water heater extending beyond the full width and depth of the water heater by at least 3” (76.2 mm) in any direction, or if the water heater is installed in an alcove or closet, the entire floor must be covered by the panel. Failure to heed this warning may result in a fire hazard. HIGH ALTITUDE A gas water heater cannot operate properly without the correct amount of air for combustion. Do not install in a confined area such as a closet, unless you provide air as shown in the “Locating The New Water Heater” section. Never obstruct the flow of ventilation air. If you have any doubts or questions at all, call your gas supplier. -
Page 9: Insulation Blankets
INSULATION BLANKETS CIRCULATION PUMPS A circulating pump is used when a system requires a circulating loop or there is a storage tank used in conjunction with the water heater. See Water Piping Diagrams in this manual for installation location of circulating pumps. Breathing Hazard - Carbon Monoxide Gas See the Circulation Pump Wiring Diagrams below for electrical Do not obstruct water heater air intake hookup information. Install in accordance with the current with insulating blanket. -
Page 10: Installation Requirements
INSTALLATION REQUIREMENTS GAS SUPPLY SYSTEMS MIXING VALVES Low pressure building gas supply systems are defined as those Water temperature over 125°F (52°C) systems that cannot under any circumstances exceed 14” W.C. can cause severe burns instantly (1/2 PSI Gauge). These systems do not require pressure regulation. resulting in severe injury or death. Measurements should be taken to insure that gas pressures are stable Children, the elderly and the physically and fall within the requirements stated on the water heater rating plate. -
Page 11: Water Piping
WATER PIPING WATER (POTABLE) HEATING AND SPACE HEATING This water heater shall not be connected to any heating systems or component(s) used with a non-potable water heating appliance. All piping components connected to this unit for space heating applications shall be suitable for use with potable water. Toxic chemicals, such as those used for boiler treatment shall not be introduced into this system. When the system requires water for space heating at temperatures higher than required for domestic water purposes, a mixing valve must be installed. Please refer to Figure 2 for suggested piping arrangement. FIGURE 7. These water heaters cannot be used in space heating applications only. NOTE: To protect against untimely corrosion of hot and cold water fittings, it is strongly recommended that di-electric unions CLOSED WATER SYSTEMS or couplings be installed on this water heater when connected to... -
Page 12: Filling The Water Heater
NOTE: The purpose of a Temperature-Pressure Relief Valve is to NOTE: In addition to the factory installed Temperature-Pressure prevent excessive temperatures and pressures in the storage tank. Relief Valve on the water heater, each remote storage tank that The T&P valve is not intended for the constant relief of thermal may be installed and piped to a water heating appliance must also expansion. A properly sized thermal expansion tank must be installed have its own properly sized, rated and approved Temperature-... -
Page 13: Unconfined Space
OUTDOOR AIR THROUGH TWO OPENINGS amount of combustion air can result in a fire or explosion and cause property damage, serious bodily injury or death. UNCONFINED SPACE An Unconfined Space is one whose volume is not less than 50 cubic feet per 1,000 Btu/hr (4.8 cubic meters per kW) of the total input rating of all appliances installed in the space. Rooms communicating directly with the space, in which the appliances are installed, through openings not furnished with doors, are considered a part of the unconfined space. -
Page 14: Outdoor Air Through Two Horizontal Ducts
OUTDOOR AIR THROUGH TWO HORIZONTAL DUCTS enclosure. The vertical ducts shall communicate directly with the outdoors. See Figure 11. Each duct opening shall have a minimum free area of 1 square inch per 4,000 Btu/hr (550 mm2 per kW) of the aggregate input rating of all appliances installed in the enclosure. When ducts are used, they shall be of the same cross sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be not less than 3 inches. AIR FROM OTHER INDOOR SPACES FIGURE 10. The confined space shall be provided with two permanent horizontal ducts, one commencing within 12 inches (300 mm) of the top and one commencing within 12 inches (300 mm) of the bottom of the enclosure. The horizontal ducts shall communicate directly with the outdoors. - Page 15 If the water heater is being installed as a replacement for an existing The vent pipe from the water heater must be no less than the heater in pre-existing venting, a thorough inspection of existing venting diameter of the draft hood outlet on the water heater and must system must be performed prior to any installation work. slope upward at least 1/4 inch per linear foot (21 mm per meter). See Figure 14. VENT DAMPERS - Any vent damper, whether it is operated thermally or otherwise must be removed if its use inhibits proper drafting of the All vent gases must be completely vented to the outdoors of the water heater.
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Page 16: Gas Piping
GAS PIPING TABLE 4. NOMINAL IRON PIPE SIZES (INCHES) LENGTH INPUT IN KW METERS 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4" 1160 1845 3221 6735 1277 2255 4626 1031 1830 3748 1552 3192 1391 2840 1259 2577 1142... -
Page 17: Sediment Traps
SEDIMENT TRAPS Contaminants in the gas lines may cause improper operation of the gas control valve that may result in fire or explosion. Before A sediment trap shall be installed as close to the inlet of the water attaching the gas line be sure that all gas pipe is clean on the heater as practical at the time of water heater installation. The inside. To trap any dirt or foreign material in the gas supply line, sediment trap shall be either a tee fitting with a capped nipple a sediment trap must be incorporated in the piping. The sediment in the bottom outlet or other device recognized as an effective trap must be readily accessible. Install in accordance with the sediment trap. If a tee fitting is used, it shall be installed in “Gas Piping” section. Refer to the current edition of the National conformance with one of the methods of installation shown in Fuel Gas Code, ANSI Z223.1/NFPA 54 or the Natural Gas and... -
Page 19: Lighting & Operating Instructions
FOR YOUR SAFETY READ BEFORE LIGHTING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. BEFORE LIGHTING: ENTIRE SYSTEM MUST BE FILLED WITH WATER AND AIR PURGED AT FAUCETS A. This appliance has a pilot which must be lighted by hand. -
Page 20: Temperature Regulation
TEMPERATURE REGULATION Short repeated heating cycles caused by small hot water uses can Never allow small children to use a hot water tap, or to draw their own bath water. Never leave a child or handicapped person unattended cause temperatures at the point of use to exceed the thermostat in a bathtub or shower. setting by up to 30°F (16.7°C). If you experience this type of use you should consider using lower temperature settings to reduce NOTE: A water temperature range of 120°F-140°F (49°C-60°C) is scald hazards. recommended by most dishwasher manufacturers. Any water heater’s intended purpose is to heat water. Hot water The thermostat of this water heater has been factory set at its lowest is needed for cleansing, cleaning, and sanitizing (bodies, dishes, position (PILOT LIGHTING). It is adjustable and must be reset to clothing). Untempered hot water can present a scald hazard. -
Page 21: Operational Conditions
TO CONSUME 1 CU. FT. OF GAS Possible noises due to expansion and contraction of some metal BTU Per Approx. Time Required To Models Type of Gas Cu. Ft. Consume 1 Cu. Ft. of Gas parts during periods of heat-up and cool-down do not necessarily represent harmful or dangerous conditions. JW375T75N-AV Natural 1050 50.3 sec. 119. 8 sec. JW375T75P-AV Propane 2500 Condensation causes sizzling and popping within the burner area during heating and cooling periods and should be considered normal. See “Condensation” in this section. Use this formula to “clock” the meter. Be sure that other gas consuming appliances are not operating during this interval. -
Page 22: Periodic Maintenance
“AIR” IN HOT WATER FAUCETS (generally two weeks or more). Hydrogen gas is extremely flammable and explosive. To prevent the possibility of injury under these conditions, we recommend the hot water faucet, located farthest away, be opened for several minutes before any electrical appliances which are connected to the hot water system are used (such as a dishwasher or washing machine). If hydrogen gas is present, there will probably be an unusual sound... -
Page 23: Housekeeping
HOUSEKEEPING It is recommended that the Temperature-Pressure Relief Valve should be checked to ensure that it is in operating condition every 6 months. When checking the Temperature-Pressure Relief Valve operation, make sure that (1) no one is in front of or around the outlet of the Fire and Explosion Hazard Temperature-Pressure Relief Valve discharge line, and (2) that the water discharge will not cause any property damage, as the Do not obstruct combustion air water may be extremely hot. Use care when operating valve as openings at the bottom of the the valve may be hot. water heater. -
Page 24: Tank Cleanout Procedure
TANK CLEANOUT PROCEDURE Close the hot water faucet opened in Step 4. 10. If the water heater is going to be shut down for an extended The following practices will ensure longer life and enable the unit to period, the drain valve should be left open. operate at its designed efficiency: TO FLUSH THE WATER HEATER STORAGE TANK: 1. Once a month the heater should be flushed. Open the drain valve and allow two gallons of water to drain from the heater. Inlet water Turn off the electrical supply to the water heater. -
Page 25: Leakage Checkpoints
LEAKAGE CHECKPOINTS A. Water at the draft hood is water vapor which has condensed out of the combustion products. This is caused by a problem in the vent. Contact the gas utility. B. *Condensation may be seen on pipes in humid weather or pipe connections may be leaking. C. *The anode rod fitting may be leaking. D. Small amounts of water from temperature-pressure relief valve may be due to thermal expansion or high water pressure in your area. E. *The temperature-pressure relief valve may be leaking at the tank fitting. F. Water from a drain valve may be due to the valve being slightly opened. G. * The drain valve may be leaking at the tank fitting. H. Combustion products contain water vapor which can condense on the cooler surfaces of the tank. Droplets form and drip onto the burner or run on the floor. This is common at the time of start-up after installation and when incoming water is cold. I. Water in the water heater bottom or on the floor may be from condensation, loose connections, or the relief valve. DO NOT replace the water heater until a full inspection of all possible water sources is made and necessary corrective steps taken. -
Page 26: Troubleshooting Guidelines
TROUBLESHOOTING GUIDELINES These guidelines should be utilized by a qualified service agent. Problem Cause Solution Improperly sealed, hot or cold supply connection, relief Tighten threaded connections. valve, drain valve, or thermostat threads. WATER LEAKS Leakage from other appliances or water lines. Inspect other appliances near water heater. Condensation of flue products. Refer to CONDENSATION. Thermal expansion in closed water system. Install thermal expansion tank (DO NOT plug T&P valve). LEAKING T&P VALVE Check relief valve for proper operation Improperly seated valve. (DO NOT plug T&P valve). High sulfate or mineral content in water supply. Drain and flush heater thoroughly, then refill. SMELLY WATER Bacteria in water supply. Chlorinate or aerate water supply. Gas control knob not positioned correctly. Refer to LIGHTING INSTRUCTIONS. Main gas supply off. -
Page 27: Water Piping Diagrams
WATER PIPING DIAGRAMS... -
Page 33: Notes
NOTES... - Page 34 NOTES...
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Page 35: Warranty
commErciaL WatEr hEatEr LimitEd WarraNty EffEctivE What's Not covErEd For 3 Years, in the event of a tank leak, we will repair or, at our • Problems caused by improper: gas supply line sizing, gas type, discretion, replace the defective water heater. venting, connections, combustion air, voltage, wiring, or fusing For 1 Year, •... - Page 36 599 Hill Street West Fergus, ON Canada N1M 2X1 Should you have any questions please Email us at techsupport@gsw-wh.com or Visit our website: www.johnwoodwaterheaters.com or Call our Technical Support line at 1-888-GSW-TECH (479-8324) Copyright © 2014 John Wood Water Heaters, All rights reserved.
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