Water Supply

Filling the Water Heater

Piping Installation

Do not insert the power cord into the electrical receptacle

Piping, fittings, and valves should be installed according to

until all the following steps have been completed.

the installation drawing (Figure 16). A pressure-reducing

1. Make sure the drain valve is closed.

valve and/or an expansion tank may be required for instal-

2. Open all hot-water

faucets served by

the system to

lations where the water pressure is high. The pressure-

allow air to escape from the tank.

reducing valve should be located on the supply to the entire

3. Open the cold-water inlet valve.

house in order to maintain equal hot and cold water pres-

Note: When filling, avoid water leakage. Do not allow the

sure.

insulation of the water heater to get wet as water can reduce

Important:

the effectiveness of the insulation.

•

Do not apply heat to the water fittings on the heater as

4. When an uninterrupted stream of water, without appar-

they may contain nonmetallic parts. If solder connec-

ent air bubbles, flows from the open hot-water faucets,

tions are used, solder the pipe to an adapter before

the tank is full.

attaching the adapter to the hot and cold water fittings.

5. Close the hot-water faucets and check the system for

•

Some models may contain energy saving heat traps to

leaks. Repair as required and retest.

prevent the circulation of hot water within the pipes. Do

Please note the following:

not remove the inserts within the heat traps.

•

Always use a proper grade of joint compound and be

The system should be installed only with piping that is suit-

certain that all fittings are drawn up tight.

able for potable (drinkable) water such as copper, CPVC,

Install the water piping and fittings as shown in Figure

PEX or polybutylene. DO NOT use PVC water piping.

16. Connect the cold water supply to the fitting (3/4"

DO NOT use any pumps, valves, or fittings that are not

NPT) marked "COLD" (or "C"). Connect the hot water

compatible with potable water.

supply to the fitting (3/4" NPT) marked "HOT" (or "H").

DO NOT use valves that may cause excessive restriction to

The installation of unions in both the hot and cold water

water flow. Use full flow ball or gate valves only.

supply lines is recommended.

DO NOT use any lead based solder in potable water lines.

The manufacturer of this water heater recommends

Use appropriate tin-antimony or other equivalent material.

installing a tempering valve in the domestic hot-water

DO NOT tamper with the gas control/thermostat, igniter,

line as shown in Figure 17. These valves reduce the

flammable vapour sensor or temperature and pressure

point-of-use water temperature by mixing cold and hot

relief valve. Tampering voids all warranties. Only qualified

water. Contact a licensed plumber or the local plumbing

service technicians should service these components.

authority.

DO NOT use with piping that has been treated with chro-

If installing the water heater in a closed water system,

mates, boiler seal, or other chemicals.

install an expansion tank in the cold water line as spec-

DO NOT add any chemicals to the system piping which will

ified under "Closed System/Thermal Expansion".

contaminate the potable water supply.

Install a shut-off valve in the cold-water inlet line. It

should be located close to the water heater and be eas-

IN A CLOSED SYSTEM USE EITHER: 1.THERMAL EXPANSION TANK

ily accessible. The owner/operator must be shown the

2.PRESSURE RELIEF VALVE.

location of this valve and be given instructions on how

to use it to shut off the water to the heater.

HOT

WATER

OUTLET

NOTE: BLOWER

ASSEMBLY NOT

SHOWN FOR

PRESSURE

UNION

CLARITY.

REDUCING

VALVE

WITH

BYPASS

COLD WATER

INLET VALVE

INLET

TEMPERATURE AND

PRESSURE RELIEF VALVE

DISCHARGE LINE 300mm

(12 in.) max (CANADA) OR

150mm (6 in.) max (U.S.)

ABOVE DRAIN

MASSACHUSETTS: INSTALL A

VACUUM RELIEF IN COLD WATER

LINE PER SECTION 19MGL 142

DRAIN PAN CONNECT TO

PROPERLY OPERATING

FLOOR DRAIN.

Figure 16 Water Piping Installation

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