Install Instructions

13
CHAPTER 4
CHAPTER 4 - WATER HEATER MAINTENANCE
4.1. Maintenance Schedule
4.1.1 Annual service by qualified service tech-
nician should include the following:
¨ Any procedure required by local codes.
¨ Verify system pressure. Air venting procedure may
require adding water to bring system up to pres-
sure, typically 12 psig.
¨ Manually operate T&P relief valve at least once a
year. This will release some hot water.
Before operating T&P relief valve, make sure
no one is in front of or around T&P relief valve
discharge piping. Hot discharge water can
cause substantial property damage, serious
injury, or death.
¨ Move operating lever to open position for a few
seconds and then move it back, allowing it to snap
closed. After T&P relief valve is operated, if it con-
tinues to release water, close cold water inlet to
water heater immediately. Follow draining instruc-
tions, and replace T&P relief valve. If T&P relief valve
weeps periodically, it may be due to thermal ex-
pansion see Section 2.7 on page 5. Do not plug
T&P relief valve or discharge piping.
Plugging T&P relief valve or discharge piping
can cause excessive pressure in water heater,
resulting in substantial property damage.,
serious injury, or death.
¨ Follow instructions on circulator to oil it, if required.
¨ Check mixing valve, valves, pipes and ttings for
leaks.
¨ Check function of eld-installed controls and valves.
See component manufacturer’s instructions.
¨ Review homeowner’s maintenance responsibilities
and their frequencies, including any not listed in
the following section.
WARNING
WARNING
4.1.2 Homeowner monthly maintenance to in-
clude:
¨ Check for air.
• Manual air vent - open and close briey to re-
lease any air.
¨ Visually check valves, pipes and ttings for leaks.
Call qualied service technician to repair leaks.
4.2. Filling Water Heater
See Sections 3.1 and 3.2 on page 9.
4.3. Draining Water Heater
Drain water heater if it will be shut o and exposed to
freezing temperatures. Freezing water will expand and
damage water heater.
• If boiler water contains sucient antifreeze, then
only the domestic water needs to be drained.
Close boiler water isolation valves and re-
lieve system pressure to below 15 psig in out-
er tank before draining inner tank to prevent
damage to inner tank. Failure to comply with
this instruction can result in substantial prop-
erty damage.
• If boiler water does not contain sucient antifreeze,
then the boiler water and domestic water must be
drained.
WARNING