John Wood Commercial AJWS User Manual
GSW WATER HEATING
599 Hill Street West
Fergus, ON, Canada N1M 2X1
To obtain technical, warranty or service assistance during
or after the installation of this water heater, call toll free:
1-888-479-8324
When calling for assistance, please have the following
information ready:
1. Model number
2. 5 digit product number
3. Serial number
4. Date of installation
5. Place of purchase
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Commercial Gas
Water Heater
Installation
Instructions and
Use & Care Guide
for Signature Series models with prefix JWS and AJWS
70305 REV.C (06-01)
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 vapours 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.
GSW Water Heating is a division of GSW Water Products Inc.
2
Your safety and the safety of others is very important.
We have provided many important safety messages in this manual and on your appliance.
Always read and obey all safety messages.
All safety messages will tell you what the potential hazard is, tell you how to reduce the
chance of injury, and tell you what can happen if the instructions are not followed.
This is the safety alert symbol.
This symbol alerts you to potential hazards that can kill or hurt you and others.
All safety messages will follow the safety alert symbol and either the word
“DANGER” or “WARNING”.
DANGER
WARNING
You can be killed or seriously injured if you don’t immediately follow
instructions.
You can be killed or seriously injured if you don’t follow instructions.
Important Instructions
• Do not use this appliance if any part has been under water. Immediately call a qualified service technician. Water
heaters subjected to flood conditions or anytime the gas controls, main burner or electrical components have been
submerged in water require replacement of the entire water heater.
• Hydrogen gas can be produced in a hot water system served by this heater that has not been used for a long period of time (generally two (2) weeks or more). Hydrogen gas is extremely flammable
and can ignite when
exposed to a spark or flame. To reduce the risk of injury under these conditions, it is recommended that the hot
water faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to
the hot water system. Use caution in opening faucets. When hydrogen is present, there will probably be an unusual
sound such as air escaping through the pipe as the water begins to flow. There should be no smoking or open
flame near the faucet at the time it is open.
The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to publish a list of substances known to the State of California to cause Cancer, birth defects, or other reproductive harm, and requires businesses to warn of potential exposure to such substances.
WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects, or other
reproductive harm.
This appliance can cause low-level exposure to some of the substances listed, including formaldehyde, carbon monoxide, and soot.
Table of Contents
Water Heater Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Combustion Air Supply and Ventilation . . . . . . . . . . . . . . . . . . . . . . 5-8
Water System Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-12
Gas Supply and Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-14
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Operating Your Water Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-19
Maintenance of Your Water Heater . . . . . . . . . . . . . . . . . . . . . . . 20-21
Trouble Shooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22-23
Repair Parts Illustration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
INSTALLATION INSTRUCTIONS
Consumer Information
This water heater is design-certified by CSAInternational as
a Category I, non-direct vented water heater which takes its
combustion air either from the installation area or from air
ducted to the unit from the outside.
This water heater must be installed according to all local
and state codes, or in the absence of local and state codes,
with the “National Fuel Gas Code”, ANSI Z223.1(NFPA 54)latest edition. Canadian installations must be performed in
accordance with CAN/CSA-B149.1. This is available from
the following:
American Gas Association
1515 Wilson Boulevard
Arlington, VA 22209
National Fire Protection Agency
1 Batterymarch Park
Quincy, MA 02269
Canadian Standards Association
5060 Spectrum Way
Mississauga, ON
L4W 5N6
Check the phone listings for the local authorities having
jurisdiction over this installation.
Installer and Owner Responsibilities
This manual has been prepared to acquaint you with the
installation, operation and maintenance of this gas water
heater and provide important safety information in these
areas.
Read all of the instructions thoroughly before attempting the
installation or operation of this water heater . Keep this manual for future reference.
Do not discard this manual. You or future users of this water
heater will need it for future reference.
The manufacturer and seller of this water heater will not be
liable for any damages, injuries or deaths caused by failure
to comply with the inst
allation and operating instructions
outlined in this manual.
The manufacturer of this water heater recommends that
it be professionally installed by qualified service technicians. Examples of qualified service technicians
include: those trained in the plumbing and heating
industry, local gas utility personnel or an authorized
service person.
Massachusetts code requires this water heater to be
installed in accordance with Massachusetts Plumbing and
Fuel Gas Code 248 CMR Sections 2.00 and 5.00.
A data plate identifying this water heater can be found on
the front of the water heater. When referring to this water
heater always have the information listed on the data plate
readily available.
Retain your original receipt as proof of purchase.
Unpacking the Water Heater
Removing Packaging Materials
Important: Do not remove any permanent instructions,
labels, or the data label from outside of the water heater or
on the inside of panels.
• Remove exterior packaging and place installation components aside.
• Inspect all parts for damage prior to installation and startup.
• Completely read all instructions before attempting to
assemble and install this product.
• After installation, dispose of packaging material in the
proper manner.
Installation Requirements
The water heater must be installed according to all local and
state codes, or in the absence of local and state codes, the
"National Fuel Gas Code”, ANSI Z223.1 (NFPA 54)-latest
edition. Canadian installations must be performed in accordance with CAN/CSA-B149.1.
Note: In the State of California, the water heater must be
braced, anchored, or strapped to avoid moving during an
earthquake. Contact local utilities for code requirements in
your area or call 1-888-479-8324 and request instructions.
Site Location
• Select a location near the center of the water piping system. The water heater must be installed indoors and in a
vertical position on a level surface. DO NOT install in
bathrooms, bedrooms, or any occupied room normally
kept closed.
• Locate the water heater as close to the gas vent as practical. Consider the vent system piping and combustion air
supply requirements when selecting the water heater
location. The venting system must be able to run from the
water heater to termination with minimal length and
elbows.
• Locate the water heater near the existing gas piping. If
installing a new gas line, locate the water heater to minimize the pipe length and elbows.
• The water heater should be located in an area not subject
to freezing temperatures. Water heaters located in
unconditioned spaces (i.e. attics, basements, etc.) may
3
Excessive Weight Hazard
Use two or more people to move and install
water heater. Failure to do so can result in
back or other injury.
WARNING
require insulation of the water piping and drain piping to
protect against freezing. The drain and controls must be
easily accessible for operation and service. Maintain
proper clearances as specified on the data plate.
• The operation of air-moving devices such as exhaust
fans, ventilation systems, clothes-dryers, fire-places, etc.,
can affect the proper operation of the water heater. Note:
Special attention must be given to the location of these
devices and the conditions they may create. Flow reversal of flue gases may cause an increase of carbon
monoxide inside of the dwelling.
Important: Air for combustion and ventilation must not
come from a corrosive atmosphere. Any failure due to corrosive elements in the atmosphere is excluded from warranty coverage.
The following types of installation (but not limited to the following) will require outdoor air for combustion due to chemical exposure, and may reduce but not eliminate the presence of corrosive chemicals in the air:
• Beauty shops
• Photo processing labs
• Buildings with indoor pools
• Water heaters installed in laundry, hobby or craft rooms
• Water heaters installed near chemical storage areas
Clearances and Accessibility
Notice: Minimum clearances from combustible materials
are stated on the data plate located on the front of the water
heater.
• If the water heater is installed in a restaurant or food service location where the floor is cleaned frequently, NSF
International requires the water heater to maintain
152mm (6 in) of clearance above the floor. To comply with
the NSF International requirement, install leg extension
kit. For availability contact 1-888-479-8324
• The water heater is certified for installation on a combustible floor.
4
Vapours from flammable liquids will
explode and catch fire causing death or
severe burns.
Do not use or store flammable products
such as gasoline, solvents or adhesives in
the same room or area near the water heater.
Keep flammable products:
1. far away from heater;
2. in approved containers;
3. tightly closed; and
4. out of children’s reach.
This water heater has a main burner and an
automatic ignition system. The ignition system:
1. can come on at any time; and
2. will ignite flammable vapours.
Vapours:
1. cannot be seen;
2. are heavier than air;
3. go a long way on the floor; and
4. can be carried from other rooms to the
water heater by air currents.
Do not install this water heater where flammable products will be stored.
WARNING
FLAMMABLE VAPOURS
Important:
The water heater should be located in an area where leakage of the tank or connections will not result in damage to
the area adjacent to the water heater or to lower floors of
the structure. Due to the normal corrosive action of the
water, the tank will eventually leak after an extended
period of time. A suitable metal drain pan should be
installed under the water heater as shown below, to help
protect the property from damage which may occur from
leaks in the piping connections or tank. The pan must limit
the water level to a maximum depth of 45mm (1 3/4 in) and
be 50mm (2 in) wider than the water heater and piped to an
adequate drain. The pan must not restrict combustion
airflow. Locate the water heater near a suitable indoor
drain. Outside drains are subject to freezing temperatures
which can obstruct the drain line. The piping should be at
least 19mm (3/4 in) ID and pitched for proper drainage.
Under no circumstances will the manufacturer or seller of
this water heater be held liable for any water damage which
is caused by your failure to follow these instructions.
FLAMMABLES
1 3/4” Max
Pipe to
adequate
drain
At least 2” greater than the
diameter of the w ater heater
Pipe to
adequate
drain
45mm max.
(1¾ in)
At least 50mm (2 in) greater than
the diameter of the water heater.
Important: If installing over carpeting, the carpeting must
be protected by a metal or wood panel beneath the water
heater. The protective panel must extend beyond the full
width and depth of the water heater by at least 76mm (3 in)
in any direction, or if in an alcove the entire floor must be
covered by the panel. The panel must be strong enough to
carry the weight of the water heater when full of water.
Figure 1 may be used as a reference guide to locate the
specific clearance locations. Aminimum of 610mm (24 in) of
front clearance and 102mm (4 in) on each side should be
provided for inspection and service.
COMBUSTION/VENT PIPE SYSTEM
Combustion
Combustion air must be free of acid-forming chemicals.
These chemicals are found in aerosol sprays, detergents,
bleaches, cleaning solvents, air freshener , paint and varnish
removers, refrigerant, and many other commercial products. When burned, vapours from these products form highly corrosive acid compounds. These products should not be
stored or used near the water heater or air inlet.
Venting
Vent pipe inst allation must be installed according to all state
and local codes, or in the absence of local and state codes,
the National Fuel Gas Code, NFPA 54, ANSI Z223.1-latest
edition. Canadian installations must be performed in accordance with CAN/CSA-B149.1.
It is the responsibility of the installing contractor to provide a
vent adequate in capacity and in good usable condition.
Btu/hr capacity limitations are governed by the style and
height of the vent/chimney. For installations in the United
States, capacity tables are available in the National Fuel
Gas Code (ANSI Z223.1- latest edition). Canadian installation information can be found in CAN/CSA-B149.1
U.L. recognized fuel gas and carbon monoxide (CO) detectors are recommended in all applications and should be
installed using the manufacturer’s instructions and local
codes, rules, or regulations.
Important: Check to make sure the vent pipe is not blocked
in any way.
• Venting should be as direct as possible with a minimum
number of pipe fittings.
5
Vent
Top to
ceiling
Sides
Front 24” min.
for service
Sides
Back
Top View
Front View
Figure 1: Minimum Clearance Locations
Carbon Monoxide Hazard
Follow all instructions to locate and install
the vent pipe system.
Instructions can be found in this manual, in
state or local codes (or authority having
jurisdiction), or in the absence of such, the
National Fuel Gas Code, ANSI Z223.1, NFPA
54, latest edition. Canadian installations
must be performed in accordance with
CAN/CSA-B149.1
Failure to properly locate and install the vent
pipe system can result in death, explosion,
or carbon monoxide poisoning.
WARNING
Front 610mm (24 in)
min. for service
• Exhaust gas vents must be installed with U.L.listed type
B vent pipe according to the vent manufacturer’s instructions and the terms of its listing.
• Single wall vent connectors must have 152mm (6 in) of
clearance from unprotected combustible surfaces.
• If sidewall venting is necessary, a power vent kit is
required. For availability contact 1-888-479-8324.
• Vents that run through unconditioned spaces where
below freezing temperatures are expected should be
properly insulated to prevent freezing.
• Existing vent systems must be inspected for obstructions,
corrosion and proper installation.
• Vents must be connected to the water heater’s drafthood
by a certified vent connector or by directly originating at
the drafthood opening.
• Some models are shipped with a vent reducer. The vent
reducer can be installed directly to the drafthood if the
existing vent system is adequately sized to support the
exhaust gases.
• Vertical gas vents must terminate with a listed cap or
other roof assembly and be installed according to their
manufacturer’s instructions.
• Horizontal vent connections must have an upward slope
of at least 21mm per metre (1/4 in per foot).
• Gas vents must be supported to prevent damage, joint
separation, and maintain clearances to combustible
materials.
• Vent connection joints should be fastened by sheet metal
screws or by other approved methods.
• Vent and vent connectors should have adequate support
to keep weight off the drafthood.
All pipe, fittings, and procedures must conform to American
National Standard Institute and American Society for Testing
and Materials (ANSI/ASTM) standards in the United States.
Important: If you lack the necessary skills required to properly install this venting system, you should not proceed, but
get help from a qualified service technician.
Air Requirements
General
Where an exhaust fan or any other air consuming appliance
(Eg. Clothes dryer, furnace, etc.) is installed in the same
space as the water heater, sufficient air openings must be
available to provide fresh air when all appliances are oper-
ating simultaneously.
The area in which the heater is located is classified as either
“an unconfined space” or “a confined space”.
An unconfined sp
ace is defined as a sp ace having a volume
not less than 50 cubic feet per 1000 BTU/hour (4.8 cubic
meters per kilowatt) of combined input rating of all appliances using the space. Adjacent open rooms may be included as part of the unconfined space. There shall be no
closeable doors between these rooms. An example of
this is an open basement.
A confined sp
ace is one smaller than described above. Air
shall be supplied through permanent openings as described
in Figure 2. At no time shall an air opening have a dimen-
sion of less than 76mm (3 in) and at no time shall any top
opening be lower than the top of the water heater.
For buildings that are not well sealed (do not have tight fitting doors and windows) natural air infiltration may provide
sufficient air required for combustion and ventilation. For
buildings using tight construction (newer and renovated
structures), the air supply shall be introduced from the outdoors, regardless of whether the space is confined or
unconfined.
Combustion Air “Supply” Ducts
Air supply ducts shall be of galvanized steel or equivalent
corrosion resistant material. A single air duct may not be
substituted when required for upper and lower air openings.
Horizontal upper combustion air ducts shall not slope
downward toward the air inlet.
Louvers and Grills
Openings for air supply ducts must provide free unobstructed air movement. Louver and grill openings must be sized
to ensure that the FREE OPEN AREAis never less than the
area of the air duct.
LOCATION:
The location for top and bottom openings are as follows;
For U.S. installations: The top opening shall commence
within 305mm (12 in) of the top of space and the bottom
opening shall commence within 305mm (12 in) of the bottom of the enclosure.
For Canadian installations: The top opening shall be
located as close to the ceiling as practical but never lower
than the relief opening of the lowest draft control device.
The bottom opening shall be located neither more than
457mm (18 in), nor less than 152mm (6 in), above floor
level.
6
An adequate air supply shall be provided for
combustion and ventilation of this water
heater.
An insufficient supply can result in poor
combustion and possible sooting of the
burner, combustion chamber, or flue passageway. This may present a potential fire
hazard or create a serious health hazard by
producing carbon monoxide.
WARNING
Air Opening Requirements
(a) EQUIPMENT LOCATED IN CONFINED SPACES; ALL AIR FROM
INSIDE THE BUILDING.
Two permanent openings (top and bottom) shall be provided connecting
the confined space (e.g., closet/small room) with the unconfined space.
Each opening shall have a free area of one square inch per 1,000
BTU/hour (22 cm²/kW) input of all appliances in the confined space, but not
less than 100 square inches (645 cm²).
(b) BASEMENT INST ALLATION, EQUIPMENT LOCATED IN CONFINED
SPACES; ALL AIR FROM OUTDOORS.
Outside air inlets shall be a minimum of 305mm (12 in) above the grade
(snow) line. When supplying air directly from the outdoors:
For American installations: Two openings (top and bottom) shall be provided with each opening having a minimum free area of one square inch
per 4,000 BTU/hour input (5.5 cm²/kW) of total input rating of all appliances
in the confined space.
For Canadian installations: Canadian codes specify single air supply
source. Canadian customers and authorities having jurisdiction may use
the sizing listed in Table 1. When using a single air supply, the duct shall
terminate within 305mm (12 in) above and within 610mm (24 in) horizontally from the burner level of the appliance having the largest input.
(c) EQUIPMENT LOCATED IN CONFINED SPACES; ALL AIR FROM
OUTDOORS.
For American installations: When supplying air directly from the out-
doors using horizontal ducting, each opening shall have a free minimum
area of one square inch per 2,000 BTU/hour (11 cm²/kW) of total input rating of all appliances in the confined space.
For Canadian installations: Refer to Table 1 of part (b).
(d) EQUIPMENT LOCATED IN CONFINED SPACES; ALL AIR FROM
OUTDOORS THROUGH VENTILATED ATTIC.
For American installations: When supplying air directly through vertical
ducting, each opening shall have a free minimum area of one square inch
per 4,000 BTU/hour (5.5 cm²/kW) of total input rating of all appliances in
the confined space.
7
Combustion
Air Duct
Permanent
Ventilation
Air
12” Grade
12”
Outdoor
Air Ducts
Venting
Combustion
Inlet
Air Ducts
Outlet Air
(a)
(b)
(d)
(c)
Figure 2: Equipment Location and
Combustion/Ventilation Air
Requirements
*U.S. installations require a dual duct system.
A
1
B
2
BTU/h (kW) mm2 (in2) mm (in) mm (in)
75,000 (23) 7,000 (11) 100 (4) 125 (5)
100,000 (30) 9,000 (14) 100 (4) 125 (5)
125,000 (37) 12,000 (18) 125 (5) 150 (6)
150,000 (45) 14,000 (22) 125 (5) 150 (6)
175,000 (53) 16,000 (25) 150 (6) 175 (7)
200,000 (60) 19,000 (29) 150 (6) 175 (7)
225,000 (68) 21,000 (32) 150 (6) 175 (7)
250,000 (75) 23,000 (36) 175 (7) 200 (8)
275,000 (83) 26,000 (40) 175 (7) 200 (8)
300,000 (90) 28,000 (43) 175 (7) 200 (8)
325,000 (98) 30,000 (47) 200 (8) 225 (9)
350,000 (105) 32,000 (50) 200 (8) 225 (9)
375,000 (113) 35,000 (54) 200 (8) 225 (9)
400,000 (120) 37,000 (58) 225 (9) 250 (10)
Combined input of
all appliances in
conf ined space
Required free
area of duct
Acceptable equivalent
duct diameter
Table 1
Notes:
1. Maximum length of ducts in column Ais 6.1 equivalent metres (20 ft).
2. Maximum length of ducts in column B is 15.2 equivalent metres (50 ft).
305mm
(12 in)
305mm
(12 in)
Drafthood/Damper Installation
Install the supplied drafthood and damper on the flue outlet
collar. Use only the supplied drafthood and damper, DO
NOT use any substitute or alter the components in any way.
Place the damper on the water heater (see figure 3A). Align
the four pilot holes on top of the water heater with the 4 corresponding holes on the damper bracket and secure with
the supplied screws. Next, align the drafthood legs with the
4 corresponding pilot holes on top of the water heater and
attach securely with the supplied screws. Locate the wiring
from the ECO, and attach it to the wiring harness on the
damper (see Figure 3A). Once damper is installed, ensure
that the damper position indicator is visible (See figure 3A).
Flue Outlet Reducer
Some units are shipped with a flue outlet reducer (See
Figure 3B). Use only the flue outlet reducer supplied with
this unit. The flue outlet reducer should be connected to the
top of the flue damper and sealed by high temperature silicon. The vent pipe must be installed according to all local
and state codes or, in the absence of local and state codes,
the “National Fuel Gas Code”, ANSI Z223.1(NFPA54)-latest
edition. Canadian installations must be performed in accordance with CAN/CSA-B149.1.
WATER SYSTEM PIPING
Piping Installation
Piping, fittings, and valves should be installed according to
the installation drawing (Figure 4). If the indoor installation
area is subject to freezing temperatures, the water piping
must be protected by insulation. Water supply pressure
should not exceed 80% of the working pressure of the water
heater. The working pressure is stated on the water heater’s
data plate. If this occurs, a pressure reducing valve with a
bypass should be installed in the cold water inlet line to the
entire system. This should be placed on the supply to the
entire structure in order to maintain equal hot and cold water
pressures.
Note: Water supplied to the unit that exceeds 12 grains
(205 mg/l) total hardness may reduce the life and performance of the water heater. Depending on the degree of hardness, it is recommended that either a water pre-treatment
system or a water softener be installed and properly maintained.
Important: Heat cannot be applied to the water fittings on
the water heater as they may contain nonmetallic parts. If
solder connections are used, solder the pipe to the adapter
before attaching the adapter to the hot and cold water fittings.
1. The water heater may have three water piping connection points. The top and front are 1 - 1/2” NPT and the
connections on the back of some heaters are 2” NPT.
When using front or back connections a combination
nipple inlet tube is required (top entry uses a dip tube).
Any one of the options listed in Table 5 may be used.
For availability contact 1-888-479-8324.
8
Do not operate heater with damper in closed
position, it must be in the open position during water heater operation. Do not negate
the action of any existing safety or operational controls.
WARNING
Bracket screws
Draft hood screws
Draft hood
Damper motor
Damper wiring harness
ECO wiring harness
Damper in OPEN position
Damper wiring harness
Damper motor
Damper position indicator
Figure 3A: Flue Damper Assembly
Damper in OPEN position
Damper wiring harness
Damper motor
Flue outlet reducer
High
temperature
silicon sealant
Figure 3B: Flue Outlet Reducer
Loading...