John Wood Atmospheric Vent Light-Duty - Manual (Page 3)

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CAUTION
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). HYDROGEN 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
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.
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 space is one smaller than described above. Air shall be
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.
FIGURE 2 - ROUGH-IN DIMENSIONS
*NOTE: Model may have prefix G, JW or SS
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
FIGURE 1
“B”
“D”
“E”
“C”
“F” “A”
“H”
“G”
GAS INLET
1/2” NPT
COLD INLET
3/4” NPT
T&P
VALVE
HOT OUTLET
3/4” NPT
DRAIN
VALVE