John-wood Polaris High-Efficiency Gas User Manual download pdf (Page 14)

Figure 15: Typical One-Temperature System Piping Installation

Mixing Valve Installation

A mixing valve has been provided for use with the

Polaris

Gas water heater and must be installed, per the

manufacturer’s instructions, in the domestic hot water line.

See Figure 16 for a sample tempering valve installation.

General Information

Water piping, fittings, and valves must be properly installed

for the correct and safe operation of this water heater.

Please note the following:

• The system should be installed only with piping that is

suitable for potable (drinking) water such as copper,

CPVC, or polybutylene. PVC water piping may be used

on the cold water inlet supply but not within 18 inches

(45.7 cm) of the cold water connection on the water

heater.

• Do not use PVC piping on the hot water outlet,

space heating supply, or space heating return.

• 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 50/50 tin-lead solder (or any lead based

solder) in potable water lines. Use 95/5 solder or

other equivalent material.

• Do not tamper with the thermostat, gas valve,

blower, electrical components, or temperature and

pressure relief valve. Tampering with any of the

components is dangerous and can result in death,

severe injury, or property damage. Tampering voids

all warranties. Only qualified technicians should

service these components.

• Do not use this water heater as a replacement for an

existing boiler installation.

• Do not use with piping that has been treated with

chromates, boiler seal, or other chemicals.

• Do not add any chemicals to the system piping

which will contaminate the potable water supply.

Closed System/Thermal Expansion

As water is heated, it expands (thermal expansion). In a

closed system, the volume of water will increase. As the

volume of water increases, there will be a correspond-

ing increase in water pressure due to thermal expansion.

Thermal expansion can cause premature tank failure (leak-

age). This type of failure is not covered under the limited

warranty. Thermal expansion can also cause intermittent

temperature-pressure relief valve operation; water dis-

charged from the valve due to excessive pressure build up.

The temperature-pressure relief valve is not intended for

the constant relief of thermal expansion. This condition is

not covered under the limited warranty.

A properly-sized thermal expansion tank should be

installed on all closed systems to control the harmful

effects of thermal expansion. Contact a plumbing service

agency or your retail supplier regarding the installation of a

thermal expansion tank. The manufacturer of this water

heater will void the warranty if there is a failure to

install a properly sized expansion tank.

Combination Space Heating/Potable

Water System

Some water heater models are equipped with inlet/

outlet connections for use in space heating applications.

Note: this water heater, “Suitable for combination water

(potable) heating and space heating and not suitable for

space heating applications only.” If this water heater is to be

used to supply both space heating and potable (drinking)

water, the instructions listed below must be followed (see

figure 17).

• Be sure to follow the manual(s) shipped with the air

handler or other type heating system.

• This water heater is not to be used as a replacement

for an existing boiler installation.

Check local codes.

(set to 120° F

[48.8° C] or lower)

Figure 16: Sample Mixing

Valve Installation

Mixing Valve

Metal Drain Pan

6” (15.2cm)

Air Gap Max.

Adequate Drain

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 63 64

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John-wood Polaris High-Efficiency Gas User Manual Page 14

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