CWH companion water heater — Product Manual
Pre-installation
(continued)
Hot Water Can Scald!
• Water heated to temperature for clothes washing,
dish washing and other sanitizing needs can scald
and cause permanent injury.
• Children, elderly, and infirm or physically handi-
capped persons are more likely to be permanently
injured by hot water. Never leave them unattended
in bathtub or shower. Never allow small children to
use a hot water tap or draw their own bath.
• If anyone using hot water in the building fits
the above description, or if state laws or local
codes require certain water temperatures at hot
water taps, you must take special precautions:
• Use lowest possible temperature setting.
• Install a thermostatic protective device at
each point of use in addition to the mixing
valve installed at the water heater.
• Water passing out of drain valves may be extremely
hot. To avoid injury:
• Make sure all connections are tight.
• Direct water flow away from any person.
For all applications:
Protection must be taken against exces-
sive temperature and pressure! — Install a
temperature & pressure (T&P) relief valve
(like that provided with the water heater) and
thermostatic mixing valve (like that provided
with the water heater). In addition, a thermo-
static protective device at each point of use
may also be necessary.
Domestic water piping requirements
1. Install unions on all piping for easy removal of water heater.
2. Use
dielectric unions or couplings to protect hot and cold water
fittings from corrosion when connecting dissimilar materials such
as copper and galvanized iron pipe.
3.
When the supply pressure is higher than 70 PSIG, install a pres-
sure reducing valve on cold water supply line to prevent water loss
through T&P relief valve. A thermal expansion tank is also required.
Studies have indicated that dangerous bacteria,
including
legionella pneumophila, can form in
the potable water distribution system if certain
minimum water temperatures are not main-
tained. Contact your local health department for
more information.
Water heater operating restrictions
1. Read the operating limits under “Operating restrictions,” page 4.
Boiler water restrictions
1. Read the WARNINGS under “Boiler water restrictions,” page 4.
Adjusting leveling legs
1. Before installing any piping, level the CWH.
2. Carefully tip the water heater onto its side.
3. Screw in the leveling legs.
4. Return the water heater to the upright position and set in place.
5. Adjust the legs as necessary to level the water heater.
Alignment of CWH under the boiler
1. When in place, there must be sufficient room to route all required
piping connections to the water heater and the WM97+ boiler.
2. Verify the fit-up of the piping access panel — the CWH must be
directly underneath the WM97+ boiler. Test fit the access panel
to be sure before installing piping. Panel must be unobstructed.
Part number 635-500-156/0113
6
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