John Wood SpaceSaver (all models except 2.5 Gallon) - Manual (Page 4)

1) INTRODUCTION
Thank you for purchasing this water heater. Properly
installed and maintained, it will provide years of trouble free
service.
The warranty on this water heater is in effect only when the
water heater is installed and operated in accordance with
these instructions. The manufacturer of this water heater
will not be liable for any injury or property damage resulting
from failure to comply with these instructions.
II) SAFETY
Relief Valve Requirements
Caution: To reduce the risk of excessive pressures and
temperatures in this water heater, install temperature and
pressure protective equipment required by local codes. It
should be no less than a combination temperature and
pressure relief valve certified by a nationally recognized
testing laboratory that maintains periodic inspection of pro-
duction of listed equipment or materials, as meeting the lat-
est edition of “Relief Valves for Hot Water Supply
Systems”, CSA 4.4 in Canada, “Relief Valves and
Automatic Gas Shutoff Devices for Hot Water Supply
Systems”, ANSI Z21.22 in the U.S.A. This valve must be
marked with a maximum set pressure not to exceed the
marked MAXIMUM working pressure of the water heater
(150 psi). Install the valve into an opening provided and
marked for this purpose in the water heater, and orient it or
provide tubing so that any discharge from the valve will exit
only within 150mm (6 in.) above, or at any distance below
the structural floor and cannot contact any live electrical
part. The discharge opening must not be blocked or
reduced in size under any circumstances. The end of the
relief pipe opening should terminate near a floor drain or
other suitable location not subject to blocking or freezing.
DO NOT thread, plug or cap the relief pipe opening.
III) INSTALLATION
Plumbing
1. The cold water inlet is identified at the top of the heater
(unless bottom entry). The hot water connection is also
identified at the top of the heater. Install a shut-off valve
in the cold line approximately 1m (3 ft.) from the inlet to
the heater where it is in convenient reach. This valve is
for emergency shut-off and MUST be kept open during
the operation of the heater.
2. The water connection fittings contain a plastic lining to
minimize corrosion and some models include plastic
heat traps. Do not apply heat to these nipples when
making solder connections. Sweat a piece of tubing to
adapter before fitting adapter to nipple.
3. After installing the water piping, cover with the pipe
insulation (if supplied with this heater). Use the insula-
tion to cover 610mm (2 ft.) of hot and cold piping near-
est to the heater.
4. A combination Temperature and Pressure relief valve
MUST be installed. In some cases it is necessary that a
Tee be fitted in the top of the heater that allows the tem-
perature probe to reach into the top of the tank (see
Figure 4). No shut-off valve of any kind is permitted
between the tank and the relief valve. The relief valve
discharge line must be piped to a drain or fixture, and
must terminate a maximum of 300mm (12 in.) (Canada)
or 150mm (6 in.) (U.S.A.) from the floor.
– 4 –
WARNING
Failure to install a listed 3/4" Temperature &
Pressure Relief Valve will release the
Manufacturer from any claim that might
result from excessive temperatures and
pressures.
CAUTION
Hydrogen gas can be produced in a hot water system
served by this storage tank 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 con-
nected to the hot water system. Use caution in opening
faucets. 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 it is open.
IMPORTANT:
This water heater must be installed strictly in accordance
with the instructions enclosed, and local electrical, fuel
and building codes. It is possible that connections to the
water heater, or the water heater itself, may develop
leaks. IT IS THEREFORE IMPERATIVE that the water
heater be installed so that any leakage of the tank or relat-
ed water piping is directed to an adequate drain in such a
manner that it cannot damage the building, furniture, floor
covering, adjacent areas, lower floors of the structure or
other property subject to water damage. This is particular-
ly important if the water heater is installed in a multi-story
building, on finished flooring or carpeted surfaces. GSW
WILL NOT ASSUME ANY LIABILITY for damage caused
by water leaking from the water heater, pressure relief
valve, or related fittings. Select a location as centralized
within the piping system as possible. In any location
selected, it is recommended that a suitable drain pan be
installed under the water heater. This pan must limit the
water level to a MAXIMUM depth of 45mm (1 3/4 in.) and
have a diameter that is a minimum of 50mm (2 in.) greater
than the diameter of the water heater. Suitable piping shall
connect the drain pan to a properly operating floor drain.
When used with a fuel-fired heater, this drain pan must not
restrict combustion air flow.