Draining The Combination Water Heater - Navien CH-180 Operation Manual

Combination water heater operation
█

Draining the Combination Water Heater

Draining the Combination Water Heater - Parts you need to know:
Procedure to drain the combination water heater (figure below). You will need to
prepare a bucket to collect some of the water to be drained.
1. Turn off the power to the unit.
2. Close the gas valve.
3. Close the water supply valve on the inlet to the unit. If there is no valve, turn off
the water supply at the water meter.
4. Open the pump drain coke on the pump and allow the water to drain.
5. Open the pump drain coke at hot outlet side, open the drain valves inside the
unit, open the drain valve at the pump and remove the filter from the cold inlet
side
6. When the water is completely drained, return the pump drain coke and the inlet
filter and close the pump drain coke inside the unit.
33