Combination Space Heating/Potable Water Heating, Water Piping - American Standard 75-76 AS Operating, Installation And Service Manual

The discharge line:
(1) Must not be smaller than the pipe size of the relief valve,
(2) Must not be plugged or blocked,
(3) Must be of material capable of withstanding 210°F
without distortion,
(4) Must be installed so as to allow complete drainage of both
the temperature and pressure relief valve and discharge line,
(5) Must terminate at an adequate drain,
(6) Must not have any valve between the relief valve and the
heater.
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.
COMBINATION TEMPERATURE
PRESSURE RELIEF VALVE
DISCHARGE LINE TO DRAIN
WARNING
Do not attempt to operate this water heater with cold water inlet
valve closed. Manually operate the temperature and pressure relief
valve at least once a year. To prevent water damage, discharge line
must terminate at an adequate drain. Standing clear of the outlet
(discharge water may be hot), lift and release the lever handle on
the temperature and pressure relief valve to make the valve operate
freely.
If the heater is installed in a closed system, the temperature and
pressure relief valve may drip at times. If the temperature and
pressure relief valve discharges a full stream of water, have the
system checked. See "Pressure Build-Up in Water System".
If the temperature and pressure relief valve on the appliance
discharges periodically, this may be due to thermal expansion in
a closed water supply system (see "Pressure Build-Up in Water
System"). Contact the water supplier of local plumbing inspector
on how to correct this situation. Do not plug the temperature and
pressure relief valve.
COMBINATION SPACE HEATING /
POTABLE WATER HEATING SYSTEM
If this water heater is to be used to supply both space heating and
domestic potable (drinking) water heating, the instructions listed
below must be followed. Be sure to follow manual(s) shipped
with air handler system.
Toxic chemicals, such as those used for boiler treatment, shall
be introduced into this system.
NEVER
This unit may be connected to any existing heating
NEVER
system or component(s) previously used with a non-potable water
heating appliance.
MANUAL RELIEF LEVER
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 boiler treatment or any chemicals to any heat
piping, since the piping contains potable water.
DO NOT use with ferrous piping. The system should be
installed only with new piping that is suitable for potable
water, such as copper or polybutylene. DO NOT use with
PVC piping.
DO NOT use any pumps, valves, or fittings that are not
com-pletely compatible with potable water piping.
DO NOT use valves that may cause excessive restriction to
water flow. USE FULL FLOW BALL OR GATE VALVES
ONLY.
DO NOT tamper with the thermostat, gas valve, ignitor
control or temperature and pressure relief valve. Tampering
with any of these components is DANGEROUS and can result
in property damage or severe injury. Tampering voids all
warranties. Only qualified personnel should service these
components.
DO NOT use 50/50 solder in potable water lines.
IF THE S PACE HEATING system requires water
temperature in excess of 120°F, a mixing valve or other means
should be installed in the domestic (potable) hot water supply
to limit the RISK OF SCALD DAMAGE. (See Figure 6)
S OME JURl S Dl CTl ONS may require a backflow
preventer in the incoming cold water line to the water heater.
In such cases, the temperature and pressure relief valve on the
water heater may weep or relieve due to expansion of the
heated water.
A diaphragm-type expansion tank (such as TACO or
EXTROL) will normally eliminate this weeping condition.
Please read and follow the manufacturer's instructions for
installation of such tanks.
WATER PIPING
Pipes and fittings should be installed in compliance with the
installation drawing. Check for dip tube in cold water fitting
before connection of hot and cold water lines. If the indoor
installation area is subject to freezing temperatures, water piping
must be protected. The water heater should be drained if being
shut down during freezing temperatures.
Have the installer show you where the cold water inlet valve for
the water heater is installed so that you know where and how to
shut the water off. It is recommended that such a valve be located
in close proximity to the cold water inlet of the water heater. See
installation drawing, Figure 6.
Connect the cold water supply to the fitting marked "C" cold, the
hot water outlet to the fitting marked "H" hot. Do not apply heat
to either of these fittings. If sweat connections are used, sweat
tubing to the adaptor before fitting adaptor to the cold and hot
water fittings. It is imperative that no heat be applied to the water
6
130931 Rev April ʻ07