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Domestic Piping
Note:
Domestic cold water inlet through a storage tank will yield a lower domestic pressure drop in addition to
greater domestic performance. Domestic set point temperature should be set to 149ºF [65ºC] see page 52. DHW
function button (
) should be set to ON (
restrictor at inlet of the domestic flow switch.
Fig. 12 : Domestic Piping - Storage Tank Installations
1. CHALLENGER
2. Isolation valve
3. Backflow preventer or pressure reducing valve (*)
4. Thermal expansion tank (potable) (*)
5. Temperature/Pressure relief valve
6. Drain/flush valve
7. Mixing valve with check valve
8. Circulator (potable, must be controlled by a aquastat) (*)
9. Flow check valve
Recirculating
Loop (optional)
8
9
C
M
7
H
Remove any
5
check valve
Storage
Tank
) at the display panel, see page 49
1
For service only
see warning on
page 23
11
3
2
4
2
12
6
10. Strainer (*)
11. Vacuum breaker (*)
12. Domestic circulator (potable Grundfos UP26-99BF
or Taco 009-SF5 or equivalent sized for 2.5 gpm
[9.5 lpm] at 32 feet [9.7 m], must be controlled by
a aquastat mounted on the storage tank with a max-
imum set point of 130ºF [55ºC].
(*) Optional device maybe required by local codes
27
10
6
6
2
2
DHW
Cold
Water
Inlet
9
. Remove domestic
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