Install Instructions

27
Domestic Piping
Storage
Tank
5
Recirculating
Loop (optional)
Remove any
check valve
11
1
For service only
see warning on
page 23
9
12
DHW
Cold
Water
Inlet
8
9
7
3
10
4
2
2
M
H
C
6
6
6
2
2
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
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
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 ( ) at the display panel, see page 49
.