24
Preventing Damage from Freezing-1
Do not remove the power plug
Freezing cannot be prevented when the power plug is disconnected.
Perform the following to prevent freezing
The unit will automatically operate (combust) to warm the water within the circuit to prevent freezing.
Note: Freezing of water within the circuit may not be prevented depending on the heating
system. For details, contact your installer.
Do not close the gas valve and water valve
* Damage can occur from frozen water within the device and pipes even in warm environments.
Be sure to read below for appropriate measures.
* Repairs for damage caused by freezing are not covered by the warranty.
Freezing will be prevented regardless of whether the operation switch is ON or OFF.
Take the measures below for extremely cold temperatures*.
Outside temperature including wind chill factor less than -30°F (-35°C) .
- When supplying combustion air from the indoors, the room temperature must be greater than 32°F
(0°C) to prevent freezing and the room inside must not have negative pressure.
This method can protect not only the heater, but also the water supply, water piping and mixing valves.
1. Turn off the power.
2. Close the gas supply valve.
3. Open a hot water fixture/faucet, and keep a small stream of hot water
running. (0.1 gallon (400 cc)/minute or about 0.2” (4 mm) thick.)
* If there is a mixing valve, set it to the highest level.
* When linking multiple units, discharge water equivalent to 0.1 gallon
(400 cc)/minute per unit.
4. The flow may become unstable from time to time.
Check the flow 30 minutes later.
* In general, it is not advisable to run water through the unit when
it is OFF ( page 6), but in this case freeze prevention is more important.
* Remember to set mixing valves and fixtures to their original levels before using the unit again
to prevent scalding.
* If there is still a risk that the unit will freeze, drain the unit as shown on the next page.
Freezing is prevented within the device automatically by operating the pump and turning on the burner.
* In normal operation, freezing is prevented within the device automatically unless the outside
temperature without wind is below -30°F (-35°C).
- When supplying combustion air from the indoors, the room temperature must be greater than
32°F (0°C) to prevent freezing and the room inside must not have negative pressure.
* The freeze prevention of the Combi Boiler will not prevent the plumbing external to the unit
from freezing. Protect this plumbing with insulation, heat tape or electric heaters, solenoids,
or pipe covers. If there remains a freezing risk, contact the nearest manufacturer’s
authorized agent.
0.2” (4 mm)
thick
Hot water
fixture/faucet
CAUTION
Summary of Contents for GHQ-C3201WX-FF PB US
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