John Wood Power Vent 0.67 EF - Manual (Page 15)

Water Supply
Piping Installation
Piping, fittings, and valves should be installed according to
the installation drawing (Figure 16). A pressure-reducing
valve and/or an expansion tank may be required for instal-
lations where the water pressure is high. The pressure-
reducing valve should be located on the supply to the entire
house in order to maintain equal hot and cold water pres-
sure.
Important:
• Do not apply heat to the water fittings on the heater as
they may contain nonmetallic parts. If solder connec-
tions are used, solder the pipe to an adapter before
attaching the adapter to the hot and cold water fittings.
• Some models may contain energy saving heat traps to
prevent the circulation of hot water within the pipes. Do
not remove the inserts within the heat traps.
• Always use a proper grade of joint compound and be
certain that all fittings are drawn up tight.
1. Install the water piping and fittings as shown in Figure
16. Connect the cold water supply to the fitting (3/4"
NPT) marked "COLD" (or "C"). Connect the hot water
supply to the fitting (3/4" NPT) marked "HOT" (or "H").
2. The installation of unions in both the hot and cold water
supply lines is recommended.
3. The manufacturer of this water heater recommends
installing a tempering valve in the domestic hot-water
line as shown in Figure 17. These valves reduce the
point-of-use water temperature by mixing cold and hot
water. Contact a licensed plumber or the local plumbing
authority.
4. If installing the water heater in a closed water system,
install an expansion tank in the cold water line as spec-
ified under "Closed System/Thermal Expansion".
5. Install a shut-off valve in the cold-water inlet line. It
should be located close to the water heater and be eas-
ily accessible. The owner/operator must be shown the
location of this valve and be given instructions on how
to use it to shut off the water to the heater.
Filling the Water Heater
Do not insert the power cord into the electrical receptacle
until all the following steps have been completed.
1.
Make sure the drain valve is closed.
2. Open all hot-water faucets served by the system to
allow air to escape from the tank.
3. Open the cold-water inlet valve.
Note: When filling, avoid water leakage. Do not allow the
insulation of the water heater to get wet as water can reduce
the effectiveness of the insulation.
4.
When an uninterrupted stream of water, without appar-
ent air bubbles, flows from the open hot-water faucets,
the tank is full.
5. Close the hot-water faucets and check the system for
leaks. Repair as required and retest.
Please note the following:
The system should be installed only with piping that is suit-
able for potable (drinkable) water such as copper, CPVC,
PEX or polybutylene. DO NOT use PVC water piping.
DO NOT use any pumps, valves, or fittings that are not
compatible with potable water.
DO NOT use valves that may cause excessive restriction to
water flow. Use full flow ball or gate valves only.
DO NOT use any lead based solder in potable water lines.
Use appropriate tin-antimony or other equivalent material.
DO NOT tamper with the gas control/thermostat, igniter,
flammable vapour sensor or temperature and pressure
relief valve. Tampering voids all warranties. Only qualified
service technicians should service these components.
DO NOT use with piping that has been treated with chro-
mates, boiler seal, or other chemicals.
DO NOT add any chemicals to the system piping which will
contaminate the potable water supply.
– 15 –
COLD WATER
INLET COLD WATER
INLET VALVE
PRESSURE
REDUCING
VALVE
WITH
BYPASS
TEMPERATURE AND
PRESSURE RELIEF VALVE
HOT
WATER
OUTLET
UNION
DRAIN PAN CONNECT TO
PROPERLY OPERATING
FLOOR DRAIN.
DISCHARGE LINE 300mm
(12 in.) max (CANADA) OR
150mm (6 in.) max (U.S.)
ABOVE DRAIN
IN A CLOSED SYSTEM USE EITHER: 1.THERMAL EXPANSION TANK
OR
2.PRESSURE RELIEF VALVE.
Figure 16 Water Piping Installation
MASSACHUSETTS: INSTALL A
VACUUM RELIEF IN COLD WATER
LINE PER SECTION 19MGL 142
NOTE: BLOWER
ASSEMBLY NOT
SHOWN FOR
CLARITY.