26
COMBINATION HEATER MAINTENANCE
3. Re-attach valve handle and close the
water shut off valve on the U-tube
assembly.
4. Open drain valve.
5. Open and separate the hot water line
union or a hot water faucet above the
combination heater. This will initiate
the siphoning procedure.
6.To refill and put the HM Combination
Heater back in operation, follow the
instruction under “Filling the Inner
Tank” page 20 .
7. Open the water shut-off valve on the
U-Tube assembly and remove handle
C. When Space Heating System Contains
Sufficient Anti-Freeze
1. Disconnect power supply to combina-
tion heater
2. If system pressure is greater than 15
psig, relieve system pressure before
proceeding.
System pressure must not exceed 15 psig
to prevent damage to inner tank.
3. Follow the procedures for draining the
inner tank. The outer tank does not
require draining.
4. When draining is complete
- close drain valve
- remove hose
CAUTION