170
106375-01 - 4/16
Appendix C - (continued)
XI
– Electrical
WARNING
Turn off all power before proceeding.
10. Remove door from boiler. Identify low voltage PCB
on right side of compartment.
11. Remove a knockout near “DHW T’Stat” connection.
Install a knockout strain relief.
12. Thread two wire leads from flow switch through
strain relief and connect them to either of the two
“DHW T’Stat” terminals. See wiring schematic in
“Wiring Section” of this manual.
CAUTION
Safety relief valve, expansion tank and flow check
valves for DHW are not supplied with this Combi.
Consult local codes to determine if required.
XII
– System Readiness
(Consult preceding sections in this manual for boiler connections)
13. Fill system. Bleed air from main heat exchanger through top, left manual air vent.
14. Connect gas line and condensate line per preceding sections in this manual.
15. Connect near boiler heating system water lines per diagram Figure C.2. Follow general piping instructions in the “System
Piping” Section of this manual.
16. Installing isolation valves and drain valves on DHW inlet and outlet is recommended to permit flat plate heat exchanger to
be flushed periodically.
17. Connect to incoming domestic cold water and building domestic hot water systems. Refer to Figure C.2.
5. Install short pipe to mix end of mixing valve. Install flow switch to mixed water outlet pipe. Ensure that flow direction
arrow points away from mixing valve.
NOTICE
Proper installation of the flow switch is required
for the boiler to fire and produce domestic hot
water.
6. Attach remaining long, L-shaped mixed water outlet pipe to mixed water outlet connection of mixing valve. Hand-
tighten.
X
- DHW Section (at boiler)
7. Remove two 3/4" unions from DHW pipe section and add thread sealant. Attach and tighten them to flat plate heat
exchanger at bottom of jacket.
8. Square up installation and tighten all unions. Ensure gaskets are properly installed.
9. Install remaining domestic piping per Figure C.2 ensuring that check valve, relief valve, and expansion tank are installed
on domestic side per local codes.
