Install Instructions

25
Domestic Piping
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.
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.
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. See Graph 3 page 79 for domestic
pressure loss.
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. Provide recirculation from the storage tank
back to the CHALLENGER using a bronze
or stainless steel type circulator.
Setting the Thermostatic Mixing Valve
The thermostatic mixing valve controls
the outlet hot water temperature deliv-
ered to the faucets.
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.
NOTICE
WARNING
DANGER
BEST PRACTICE
C
o
l
d
H
o
t
Adapter
Check Valve
(cold & hot)
Mixed
Fig. 9: Mixing Valve Assembly