Installation / Operation Instruction Manual

29
SECTION VIII
MAINTENANCE
This indirect-fired water heater is intended to provide a service life of
many years. Components that require service, however, may be
subject to failure. Failure to use the correct procedures or parts in
these circumstances may make the water heater unsafe.
The owner should arrange to have the following inspections and
simple maintenance procedure performed by qualified service
personnel at the frequencies suggested.
1. Boiler and Domestic Water Piping (Annual) – Check all
piping for signs of leakage at joints, unions, and shut-off valves.
Repair as needed.
2. Temperature and Pressure Relief Valve (Annual) – The
temperature and pressure relief valve should be checked to
ensure that it is in operating condition. To check the relief
valve, lift the lever at the end of the valve several times. The
valve should seat properly and operate freely. If water does not
flow, remove and inspect for obstructions or corrosion. Replace
with a new valve of the recommended capacity as necessary.
Do not attempt to repair the valve, as this could result in
improper operation and a tank explosion. In areas with poor
water conditions, it may be necessary to inspect the
temperature and pressure relief valve more often than once a
year. If the temperature and pressure relief valve on the heater
discharges periodically or continuously, it may be due to
thermal expansion of water in a closed water supply system, or
it may be due to a faulty relief valve.
Thermal expansion is the normal response of water when it is
heated. In a closed system, thermal expansion will cause the
system pressure to build until the relief valve actuation
pressure is equaled. Then the relief valve will open, allowing
some water to escape, slightly lowering the pressure. Contact
your water supplier or local plumbing inspector on how to
control this situation.
ABOVE ALL, DO NOT PLUG THE TEMPERATURE AND
PRESSURE RELIEF VALVE. THIS IS NOT A SOLUTION
AND CAN CREATE A HAZARDOUS SITUATION.