CWH companion water heater — Product Manual
Water heater maintenance
Boiler water — read and comply with all requirements under
“Boiler water restrictions,” page 4.
Water from opened drain valves, unions and other connec-
tions may be extremely hot. To avoid severe personal injury,
death or substantial property damage:
• Tightenalldrainhoseconnections.
• Directhotwaterawayfromallpersons.
ATTENTION USER!
Have the water heater serviced at least once an-
nually
by a qualified service technician.
Follow the maintenance procedures below at least
monthly.
See WM97+ User’s Information Manual for informa-
tion on setting the control.
Failure to comply with the above can result in severe
personal injury, death or substantial property damage.
MONTHLY maintenance by user
• At least MONTHLY, visually check valves, pipes and fittings for
leaks.
• Check hot water supply at several outlets. Make sure water
temperature is not too hot.
• Call qualified service technician to repair leaks or address
problems.
ANNUAL maintenance
by qualified service technician
Check water supply temperature at several outlets to ensure
the water temperature is acceptable for intended use and
that all temperature control devices are functioning properly.
Read page 4 and verify that all requirements are met by the
installation.
Perform the following procedures:
Perform any procedures required by local codes.
Verify system pressure both on domestic water and boiler water sides.
Manually operate T&P relief valve at least once a year (see Fig-
ure 18). This will release some hot water. 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 continues to release wa-
ter, close cold water inlet to water heater immediately. Follow draining
instructions, and replace the T&P relief valve. If T&P relief valve weeps
periodically, it may be due to thermal expansion. Install an expansion
tank if not already installed.
The CWH must use ONLY the circulator model
supplied with the unit or suggested by Weil-McLain.
The circulator is water-lubricated and does NOT
require oiling.
Check valves, pipes and fittings for leaks.
Check function of all controls and valves (see con-
trol manufacturer’s instructions).
Review homeowner’s maintenance responsibilities
and their frequencies.
Shutdown procedure
1. Drain the water heater if it will be shut off and
exposed to freezing temperatures. Freezing water
will expand and may damage water heater.
a. If boiler water contains sufficient antifreeze,
then only the domestic water needs to be
drained.
b. If boiler water does not contain sufficient anti-
freeze, then the boiler water and the domestic
water must be drained.
Figure 18 T&P valve operation
Before operating the T&P relief
valve, make sure no one is in front of
or around the T&P relief valve dis-
charge piping. Hot discharge water
can cause severe personal injury or
substantial property damage.
Plugging T&P relief valve or dis-
charge piping can cause excessive
pressure in the water heater, result-
ing in severe personal injury, death
or substantial property damage.
Part number 635-500-156/0113
23
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