Polaris PG10/GHX Instruction Manual page 33

circulating pump is used, it is important to note that the flow rate
should be slow so that there will be a minimum of turbulence inside
the water heater storage tank.
Adjust flow by throttling a full port ball valve installed in the
circulating line on the outlet side of the pump. Never throttle flow
on the suction side of a pump. See Figure 53 in Piping Diagrams.
NOTE: In addition to the factory installed Temperature-Pressure
Relief Valve (T&P valve) on the water heater, each remote storage
tank that may be installed and piped to a water heating appliance must
also have its own properly sized, rated and approved Temperature-
Pressure Relief Valve installed. See Temperature-Pressure Relief
Valve on Page 19.
Call the toll free technical support phone number listed on the back
cover of this manual for further assistance in sizing a T&P valve for
remote storage tanks.
THERMOMETERS (NOT SUPPLIED)
Thermometers are installed in the water piping system as a means
of detecting the temperature of the hot water supply at critical points
in the system. Field supplied thermometers should be obtained and
installed. See Piping Diagrams beginning on Page 58.
WATER (POTABLE) HEATING AND SPACE HEATING
1. All water piping components connected to the water heater that
are for space heating applications shall be suitable for use with
potable water.
2. Toxic chemicals, such as those used for boiler treatment, must
NEVER be introduced into this system.
3. The water heaters covered in this manual may never be
connected to any existing heating system or component(s)
previously used with non-potable water heating appliance.
4. When the system requires water for space heating that exceed
safe temperatures at domestic water fixtures a mixing valve must
be installed, see Mixing Valves on Page 17.
5. These water heaters cannot be used in space heating
applications only.
HOTTER WATER CAN SCALD:
Water heaters are intended to produce hot water. Water heated to
a temperature which will satisfy space heating, clothes washing,
dish washing, cleaning and other sanitizing needs can scald and
permanently injure you upon contact. Some people are more likely
to be permanently injured by hot water than others. These include
the elderly, children, the physically or developmentally disabled. If
anyone using hot water fits into one of these groups or if there is a
local code or state law requiring a certain temperature water at the
hot water tap, then you must take special precautions. In addition
to using the lowest possible temperature setting that satisfies your
hot water needs, a means such as a mixing valve should be used
at the hot water taps used by these people or at the water heater.
See Figure 7 in Mixing Valves. Valves for reducing point of use
temperature by mixing cold and hot water are also available:
Consult a Qualified Installer
manufacturer's instructions for installation of the valves. Before
changing the factory setting on the thermostat, read the Temperature
Regulation section beginning on Page 34.
or Service Agency. Follow
T&P VALVE DISCHARGE PIPE
This water heater is provided with a properly rated/sized and
certified combination temperature - pressure (T&P) relief
valve by the manufacturer. See Temperature-Pressure Relief
Valve on page 19 for information on replacement and other
requirements.
CAUTION
Water Damage Hazard
•
Temperature-Pressure Relief Valve discharge
pipe must terminate at adequate drain.
Install a discharge pipe between the T&P valve discharge opening
and a suitable floor drain. Do not connect discharge piping directly
to the drain unless a 6" (15.2 cm) air gap is provided. To prevent
bodily injury, hazard to life, or property damage, the Temperature-
Pressure Relief Valve must be allowed to discharge water in
adequate quantities should circumstances demand. If the discharge
pipe is not connected to a drain or other suitable means, the water
flow may cause property damage.
T&P VALVE DISCHARGE PIPE REQUIREMENTS:
• Shall not be smaller in size than the outlet pipe size of the
valve, or have any reducing couplings or other restrictions.
• Shall not be plugged or blocked.
• Shall not be exposed to freezing temperatures.
• Shall be of material listed for hot water distribution.
• Shall be installed so as to allow complete drainage of both the
Temperature-Pressure Relief Valve and the discharge pipe.
• Must terminate a maximum of six inches above a floor
drain or external to the building. In cold climates, it is
recommended that the discharge pipe be terminated at an
adequate drain inside the building.
• Shall not have any valve or other obstruction between the
Temperature-Pressure Relief Valve and the drain.
33
Explosion Hazard
Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.