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6. Domestic Piping
DANGER
For proper operation of the thermostatic mixing valve,
and to prevent potential scaling hazards, the recircula-
tion loop should be controlled by an aquastat. DO NOT
use continuous recirculation.
6.11 Recirculation Piping
• Recirculation return piping, if applicable, must be installed in
the cold water inlet as shown in Figs. 11 and 12 on pages 20 and
21.
• A stainless steel or bronze circulator is recommended and must
be contolled by an aquastat.
6.12 Storage Tank Installation
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 on page 21) 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
sensor
3. Provide recirculation from the storage tank back to the
CHALLENGER using a bronze or stainless steel circulator.
6.13 Setting the Thermostatic Mixing Valve
NOTICE
The thermostatic mixing valve controls the outlet hot
water temperature delivered 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 manufacturer's instructions included with the
valve.
19
Check Valve
(cold & hot)
Adapter
Figure 9: Mixing Valve Assembly
Mixed
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