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Winterizing Your Heater
When heaters installed outdoors in freezing climate
areas are to be shut down for the winter, please
observe the following step-by-step procedure:
1. Remove the drain plug or open the drain cock
located on the inlet-outlet header. On larger
heaters with external Unitherm Governor(s) and
piping, locate plug at low point of Governor piping,
or break connections and rotate inlet fittings 180
degrees to face downward. Turn off manual main
gas and main gas shut off.
2. Disconnect compression fittings on both ends of
the 1/8" copper tube and allow the tube to drain.
Remove the "heat exchanger inspection panels"
on the right side of the heater to gain access to the
fitting on the return header. Remove return head-
er.