John Wood Atmospheric Vent Light-Duty User Manual

GSW WATER HEATING

A GSW Company

599 Hill Street West
Fergus, ON, Canada N1M 2X1

GAS FIRED WATER HEATER

INSTALLATION AND OPERATING INSTRUCTIONS

Read these instructions thoroughly before starting

TABLE OF CONTENTS

I) Introduction ............................................................2

II) Air Requirements....................................................3

III) Gas Connections....................................................5

IV) Water Pipe Connections ........................................5

V) Venting ..................................................................6

VI) Lighting & Operating Instructions ..........................7

VII) Service And Maintenance ......................................9

VIII) Combo Heating ....................................................11

IX) Replacement Parts Listing ..................................12

X) Warranty ..............................................................13

PLEASE RETAIN THESE INSTRUCTIONS IN A
SAFE LOCATION FOR FUTURE REFERENCE

FOR YOUR SAFETY

• Do not store or use gasoline or other
flammable vapours and liquids in the
vicinity of this or any other
appliance.

• Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.

WARNING: Improper installation,
adjustment, alteration, service, or
maintenance can cause injury or
property damage. Refer to this
manual. For assistance or additional
information, consult a qualified
installer, service agency, or the gas
supplier.

WARNING: If the information in
these instructions is not followed
exactly, a fire or explosion may
result causing property damage,
personal injury or death.

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.

PART NO. 72082 REV. H (03-12)

I) INTRODUCTION

We thank you for choosing a GSW or John Wood Water Heater.
Your satisfaction with this product is very important to us.

The design of this gas-fired water heater has been approved to
provide potable hot water or when combined with a suitably-sized
fan coil, baseboard heater, etc., to provide both space heating
and domestic hot water.

Important Consumer Notice

These instructions have been written for the proper installation,
safe operation and maintenance of this water heater.

It is your responsibility to ensure that your water heater is properly
installed and cared for.

FAILURE TO FOLLOW THE
INSTRUCTIONS IN THIS MANUAL MAY RESULT IN
SERIOUS BODILY INJURY AND /OR PROPERTY
DAMAGE. THOROUGHLY READ ALL INSTRUCTIONS

before you attempt to install or operate this heater.
Installation and service require trade knowledge in the area of

plumbing, venting, air supply and gas supply. If you lack these
skills or do not understand these instructions, enlist the help of a
qualified professional.

GSW Water Heating Company, the manufacturer of this water
heater, cannot be held liable for those damages caused by
improper installation, sizing or failure to comply with these

instructions. Protect your warranty: Regularly
maintain your water heater and venting system as detailed in the

service and maintenance section of this manual.

Installation Code Requirements

In addition to the installation instructions found in this manual, the
heater shall be installed in accordance with local codes or , in the
absence of local codes, the latest edition of CAN/CGA B149.1

installation code in Canada / National Fuel Code ANSI Z223•1
(NFPA 54) in the USA.

Authorities having jurisdiction shall be consulted before
installations are made.

Important: All supply equipment, installation,

approvals, permits, inspections, etc. are the responsibility
of the owner of this water heater. Consult your local
authorities for regulations specific to your area.

Relief Valves (T&P)

All heaters must be installed with a proper temperature and
pressure relief valve. These valves must be certified as meeting
the requirements for Relief Valves and Automatic Gas Shut-Off
Devices for Hot Water Supply Systems, ANSI Z21•22 in the
USA / CAN1-4.4, Temperature, Pressure, Temperature and
Pressure Relief Valves and Vacuum Relief valves in Canada.

Backflow Prevention

Certain jurisdictions may require the installation of a backflow
prevention device (e.g., check valve) in the water supply line.
Such a device will require the use of a system expansion tank of
adequate size to control the thermal expansion generated during
the heating cycle. Consult your water supplier or local plumbing
authority.

Important: The supply water meter may have a built-in check

valve device. Contact your local water authority.

Safety Warnings

• Water Heaters are heat-producing appliances. To avoid damage
or injury, no materials shall be stored against the heater and
provision shall be made to prevent unauthorized contact (e.g.
children).

• Hot water produced by this appliance can cause severe burns
due to scalding. The hazard is increased for young children, the
aged, or the disabled where water temperatures exceed
120OF(49OC).

• Use anti-scald valves, set to 120OF(49OC), in the hot water
system to reduce the risk of scalding at points of use such as
lavatories, sinks and bathing facilities. Such precautions must
be followed when this heater is operated in combination with
dishwashing or space heating applications.

• As with all fuel burning equipment, this heater requires an
adequate supply of air for combustion and ventilation. An
insufficient air supply can result in poor combustion or the re­circulation of the exhaust flue gases. Such a condition can
cause sooting or present a fire hazard, which may result in
serious bodily harm or death from asphyxiation.

MAKE SURE THE FLOW OF COMBUSTION AND
VENTILATION AIR IS NOT RESTRICTED.

• Important:There is a risk in using fuel-burning appliances
such as water heaters. Areas that may not be suitable for water
heater installation include those where flammable liquids,
gasoline, solvents, adhesives, etc., or engine-driven equipment
or vehicles are stored, operated or repaired. Due to the nature
of air movement, flammable vapors can be carried some
distance from the point of storage. The gas-fired water heater
pilot or main burner flame can ignite these vapors causing a
flashback, fire or explosion which may result in serious personal
injury or death, as well as severe property damage.

FOR YOUR SAFETY, DO NOT STORE OR USE
GASOLINE OR OTHER FLAMMABLE,
COMBUSTIBLE OR CORROSIVE VAPORS OR
LIQUIDS IN THE VICINITY OF THIS HEATER OR
ANY OTHER APPLIANCE.

• If installation in a garage or shed is the only option, it is required
that the water heater be elevated a minimum of 18”(45 cm)
above the floor level. This may reduce, BUT NOT
ELIMINATE, the risk of flammable vapors being ignited.
Ensure supports are capable of supporting this heater filled with
water and support piping. Such installations must be protected
from impact or physical damage caused from moving equipment
or vehicles. CHECK LOCAL CODES!

• Exposure to air borne chemicals can cause severe corrosion to
the water heater and damage to the venting parts. Air containing
vapors from cleaning solvents, pool chemicals, refrigerator or air
conditioning refridgerants, laundry detergents or bleaches,
waxes, spray can propellants, dry cleaning, photo processing
liquids, calcium and sodium chloride (softener salt) or other
process chemicals are typical of compounds which are
potentially corrosive. Products of this type should not be stored
near the heater. Air containing these chemicals should not be
used as supply to the heater. If necessary, uncontaminated air
shall be obtained from remote or outside sources.

EXPOSURE TO WATER

IMPORTANT: Should the water heater be subjected to

flooding, freezing, fire, or other unusual condition, turn off gas
at the manual gas shut-off valve and water at the inlet valve to
the heater. Do not put the heater in operation until it has been
thoroughly checked by a qualified gas technician.

THESE CONDITIONS CAN RESULT IN UNSEEN
INTERNAL DAMAGE

and are not subject to warranty coverage.

– 2 –

CAUTION

MODEL# 75-3 6058 602/60E 5063T 4060T

FRONT

CLEARANCE

5"/13cm 5"/13cm 5"/13cm 5"/13cm 5"/13cm

75-3 24 11 3/8 15 5/16 54 1/8 62 65 1/8 4 12

6058 22 12 1/16 16 3/16 51 7/8 58 3/4 62 1/2 4 8

602/60E 22 12 1/16 16 3/16 51 7/8 58 3/4 62 1/2 4 8

5063T 22 9 7/8 14 54 13/32 61 1/16 64 1/2 4 8

50T 20 9 5/8 14 50 1/8 56 3/4 59 15/16 4 8

50F 24 9 13/16 13 7/8 43 1/4 50 3/16 53 15/16 4 8

502/50E 22 9 13/16 13 7/8 43 1/4 50 3/16 53 15/16 4 8

50S 22 9 5/8 14 41 1/2 48 3/8 53 7/8 4 8
4060T 20 9 5/8 14 54 13/32 60 1/2 64 1/4 4 8
4040T 18 9 5/8 14 51 1/4 59 1/2 63 4 8

40T 18 9 5/8 14 51 1/4 57 5/8 60 13/16 3 8

40F 22 9 5/8 14 42 1/2 50 3/16 53 15/16 4 8

402/40E 20 9 5/8 14 42 1/2 49 1/4 53 4 8

40S 20 9 5/8 14 41 1/4 47 3/4 50 15/16 3 8

30T 16 9 5/8 14 50 3/4 56 3/4 59 15/16 3 8

30S 18 9 5/8 14 39 3/4 46 49 3/16 3 8

19 18 9 5/8 14 27 13/16 34 37 1/4 3 8

MODEL # A B C D E F G H

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 weeks or more). HYDR

OGEN GAS IS

EXTREMELY FLAMMABLE. 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. If
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 THAT IT IS OPEN.

INSTALLATION INSTRUCTIONS

Location and Clearances

Location selected should be as close to the stack or chimney as
practical and as centralized with the piping system as possible.
The heater should be located in an area not subject to freezing
temperatures.

Locate near a floor drain and in an area where leakage of the tank
or water piping will not result in damaging adjacent areas or lower
floors of the structure. Where such a location is not available, a
suitable drain pan, not restricting combustion air flow, must be
installed under the water heater. This pan shall be 1½“ (40 mm)
deep and a diameter that is a minimum of 2” (50 mm) greater than
the diameter of the water heater. A suitable pipe properly
connected to an adjacent floor drain shall be provided.

GSW CANNOT BE HELD RESPONSIBLE for damage
caused by water from the water heater, pressure relief valve, or
related fittings where adequate provisions to drain such water has
not been made.

Locate the water heater such that all controls are easily
accessible. We recommend that 24” (0.6 m) in front of the heater
and 34”(0.9m) above be maintained for serviceability. Ensure that
the water heater is level.

Minimum clearances between the heater and combustible
materials are: 1”(25mm) sides and rear; 4”(100mm) at the front;
open on an alcove; 8”(200mm) from the top of the water heater
and the flue 6”(150mm), except for certain models will have
different wall clearances as shown in Table (1) below. This heater
may be installed in a closet or alcove and is certified for operation
on a combustible floor.

TABLE 1

FIGURE 1

WARNING

Do not install directly on carpet. Instead, place the water heater on
a metal or wood panel extending a minimum of 3” (75 mm) from
all sides. In alcoves or closets, cover the carpet completely.
Ensure that this panel is capable of supporting the weight of this
heater when filled with water.

FAILURE TO PROPERLY INSTALL THIS HEATER MAY
RESULT IN A FIRE HAZARD.

HOT OUTLET
3/4” NPT

“F”

“C”

“G”

GAS INLET
1/2” NPT

“H”

“A”

T&P

VALVE

DRAIN
VALVE

COLD INLET
3/4” NPT

“E”

“D”

“B”

*NOTE: Model may have prefix G, JW or SS

FIGURE 2 - ROUGH-IN DIMENSIONS

II) AIR REQUIREMENTS
General

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 could create a serious
health hazard by producing carbon monoxide.

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 operating simultaneously.

The area in which the heater is located is classified as either “an
unconfined space” or “a confined space.”

An unconfined space is defined as a space 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
supplied through permanent openings as described in Figure 3.

At no time shall an air opening have a dimension of
less than 3” (75 mm) and at no time shall any top opening be

lower than the top of the water heater.

– 3 –

ace is one smaller than described above. Air shall be

A

1

B

2

BTU/hr(kW)

in2(cm2)

in(mm) in(mm)

25,000(8) 7(45) 3(75) 4(100)

50,000(15) 7(45) 3(75) 4(100)

75,000(23) 11(70) 4(100) 5(125)

100,000(30) 14(90) 4(100) 5(125)

125,000(37) 18(120) 5(125) 6(150)

150,000(45) 22(140) 5(125) 6(150)

Combined input of

all appliances in

confined space

Required

free area

of duct

Acceptable equivalent

duct diameter

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 AREA is never less than the area of the air duct.

LOCATION:

The location for top and bottom openings are as follows;
For American installations:The top opening shall commence within 12” (30 cm)
of the top of space and the bottom opening shall commence within 12” (30 cm) 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 18 inches (450
mm), nor less than 6 inches (150 mm), above floor level.

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 INSTALLATION, EQUIPMENT LOCATED IN CONFINED
SPACES; ALL AIR FROM OUTDOORS.

Outside air inlets shall be a minimum of 12” (30 cm) 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 2. When using a single air supply, the duct shall terminate within 1 foot (30
cm) above and within 2 feet (60 cm) horizontally from the burner level of the
appliance having the largest input.

Table 2

*

*

1. Maximum length of ducts in column A is 20 equivalent feet (6.1 meters).

2. Maximum length of ducts in column B is 50 equivalent feet (15.2 meters).

(c) EQUIPMENT LOCATED IN CONFINED SPACES; ALL AIR FROM
OUTDOORS.

For American installations: When supplying air directly from the outdoors 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 2 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.

*U.S. installations require a dual duct system.

Figure 3: EQUIPMENT LOCATION AND
COMBUSTION /VENTILATION AIR
REQUIREMENTS

– 4 –