Water System Piping - Polaris GAS WATER HEATER Installation, Operation And Service Manual

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:
DO NOT install this water heater with iron or galvanized piping. The
system should be installed only with new piping that is suitable for potable
(drinkable) water such as copper, CPVC, or polybutylene. PVC water piping
may be used on the cold water inlet supply BUT DO NOT USE PVC PIPING
WITHIN 18 INCHES 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 tin-antimony or other equivalent material.
DO NOT tamper with the thermostat, gas valve, ignition control or
temperature and pressure relief valve. Tampering with any of the
components is DANGEROUS and can result in property damage, severe
injury or death. 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.
DO NOT install check valves in the cold water supply line to the water
heater.
CAUTION
NEVER OPERATE AN EMPTY OR PARTIALLY FILLED WATER
HEATER. THIS CAN RESULT IN SERIOUS DAMAGE TO THE TANK.
TEMPERATURE & PRESSURE RELIEF VALVE
WARNING
DO NOT ATTEMPT TO OPERATE THIS WATER HEATER WITHOUT A
PROPERLY INSTALLED TEMPERATURE AND PRESSURE RELIEF
VALVE. FAILURE TO FOLLOW THIS INSTRUCTION CAN RESULT IN
PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
For protection against excessive pressures and temperatures, a
temperature and pressure relief valve must be installed in the opening
marked "T & P RELIEF VALVE" (see Figure 13). This valve must be design
certified by a nationally recognized testing laboratory that maintains
periodic inspection of the production of listed equipment or materials as
meeting the requirements for Relief Valves and Automatic Shut-off Devices
for Hot Water Supply Systems., ANSI Z21.22. The function of the
temperature and pressure relief valve is to discharge water in large
quantities in the event of excessive temperature or pressure developing in
the water heater. The valve must not exceed the working pressure of the
water heater as stated on the data plate. TO PREVENT PROPERTY
DAMAGE, PERSONAL INJURY OR DEATH, THE RELIEF VALVE MUST
BE ALLOWED TO OPERATE PROPERLY.
Only a new temperature and pressure relief valve should be used with your
water heater. Do not use an old or existing valve as it may be damaged or
not be adequate for the working pressure of the new water heater.
14

WATER SYSTEM PIPING

THE TEMPERATURE & PRESSURE RELIEF VALVE:
•
Must not be in contact with any electrical part.
•
Must be connected to an adequate discharge line.
• Must not exceed the working pressure shown on the data plate of the
water heater.
THE DISCHARGE LINE:
•
Must not be smaller than the pipe size of the relief valve.
•
Must not be capped, blocked, plugged or contain any valve between the
relief valve and the end of the discharge line.
•
Must terminate 6 inches above a floor drain or external to the building
within 6 inches to the ground.
• Must be capable of withstanding 250°F (121°C) without distortion.
•
Must be installed to allow complete drainage of both the temperature
and pressure relief valve and discharge line.
WARNING
FAILURE TO INSTALL AND MAINTAIN A NEW PROPERLY LISTED
TEMPERATURE AND PRESSURE RELIEF VALVE WILL RELEASE THE
MANUFACTURER FROM ANY CLAIMS WHICH MIGHT RESULT FROM
EXCESSIVE TEMPERATURE OR WATER PRESSURE.
Manually operate the temperature and pressure relief valve at least once a
year to make sure it is working properly.
To prevent water damage, the valve must
be properly connected to a discharge line
which terminates at an adequate drain.
Standing clear of the outlet (discharged
water may be hot), slowly lift and release
the lever handle on the temperature and
pressure relief valve to allow the valve to
operate freely and return to its closed
position. If the valve fails to completely
reset and continues to release water, immediately shut off the manual gas
valve and the cold water inlet valve, and call a qualified service technician.
DANGER
DISCHARGING WATER MAY BE HOT AND CAN CAUSE SCALD
INJURIES AND PROPERTY DAMAGE. DISCHARGE LINES MUST BE
PROPERLY INSTALLED AND PIPED TO AN ADEQUATE DRAIN.
CLOSED SYSTEM/THERMAL EXPANSION
Periodic discharge of the temperature and pressure relief valve may be due to
thermal expansion in a closed water supply system. The water utility supply
meter may contain a check valve, backflow preventer or water pressure
reducing valve. Some jurisdictions may require a backflow preventer in the
incoming cold water line when using this water heater for combination space
heating/domestic potable water.
This will create a closed water system. During the heating cycle of the water
heater, the water expands causing pressure inside the water heater to
increase. The temperature and pressure relief valve may discharge hot water
under these conditions which results in a loss of energy and a build-up of lime
on the relief valve seat.
A diaphragm-type expansion tank suitable for potable water will normally
eliminate this weeping condition. Please read and follow the manufacturer's
instructions for the installation of such tanks.
Contact the local water supplier or plumbing inspector for information on how
to control this situation. Do not plug or restrict the temperature and pressure
relief valve.