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Domestic Piping
BEST PRACTICE
Additional thermostatic/anti-scald valves
should be installed at each hot water
faucet, bath and shower outlet.
For applications with a domestic recirculation
loop, the recirculation pump should be controlled
by an aquastat. The maximum recommended set-
ting of the aquastat is 10ºF [5ºC] lower than the
thermostatic mixing valve setting.
DANGER
For proper operation of the thermostat-
ic mixing valve and to prevent potential
scalding hazards, the recirculation loop
should be controlled by an aquastat. DO
NOT use continuous recirculation.
Check Valve
(cold & hot)
Adapter
Fig. 9: Mixing Valve Assembly
Recirculation Piping
•
Recirculation return piping if applicable,
must be installed in the cold water inlet as
shown Figs 11 and 12, page 26 and 27.
•
A stainless steel or bronze circulator is rec-
ommended and must be controlled by a
aquastat.
Mixed
Storage Tank Installations
For applications requiring high domestic hot
water flow rates for a short period of time (dump
load), the installer may install a storage type tank
(see Fig. 12 page 27) in the domestic piping.
The installer must:
1. Relocate the thermostatic mixing valve from the
CHALLENGER to the outlet of the storage tank.
2. Remove domestic restrictor at the inlet of the
domestic flow switch.
3. Provide recirculation from the storage tank
back to the CHALLENGER using a bronze
or stainless steel type circulator.
Setting the Thermostatic Mixing Valve
NOTI E
The thermostatic mixing valve controls
the outlet hot water temperature deliv-
ered to the faucets.
WARNING
POTENTIAL SCALD HAZARD. The
mixing valve must be installed on the
CHALLENGER. Removal or adjustment
of the mixing valve will create a potential
scald hazard resulting in severe personal
injury or death.
If any adjustment needs to be made to the
valve's temperature setpoint refer to the manu-
facturer's instructions included with the valve.
25
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