Freeze Prevention; Winter Shutdown - Takagi GS-20W-AU5 Installation Manual And Owners Manual

14. FREEZE PREVENTION

This unit comes equipped with heaters that prevent the unit from freezing. For this freeze
prevention system to operate, there has to be electrical power to the unit. The freeze prevention
devices will not work if the electrical power source is disconnected. The unit has been rated for
temperatures down to -15 °C in a wind free environment. Do not install the water heater in an
area with extremely cold weather.
The pipe heaters are located on the Water Heater only. Any hot or cold water pipes
located outside of the unit will not be protected. Properly protect and insulate these
pipes from freezing.

WINTER SHUTDOWN

If you will not be using your heater for a long period of time or if the temperatures will drop below
-15 °C with the wind chill factor, turn off your heater and drain the unit of water. This will keep
your unit from freezing and being damaged.
Follow these instructions carefully:
1. Close the manual gas shut off valve.
2. Turn off the power supply to the water heater.
3. Close the manual water shut off valve located on
the water supply line.
4. Open all hot water taps in the house. (Bathroom,
kitchen, laundry room, etc.). When the water flow
has ceased, close all hot water taps.
5. Have a bucket or pan to catch the water from the
unit's drain plugs.
drain all the water out of the unit.
6. Wait a few minutes to ensure all water has com-
pletely drained from unit.
7. Securely screw the drain plugs back into place.
Hand-tighten only.
When it is again safe to use the water heater:
• Make sure all hot water taps are closed and the drain plugs are securely attached.
• Purge the water line of debris.
• Turn on the manual water control valve located on the water supply line.
• Open all the hot water taps to verify water flows to the taps. Close hot water taps.
• Turn on the manual gas control valve located on the gas supply line.
• Turn on the power supply to the Water Heater.
Unscrew
the drain plugs to
CAUTION
20
Manual
water valve
Drain
plug
Hot
Cold
Gas
Power
supply
Manual
gas valve