Raypak 336A, Installation & Operating Instructions Manual

Page: 9 / 56

9
COLD WEATHER OPERATION
IMPORTANT FREEZE INFORMATION
MODERATE CLIMATE: Heater operation can contin-
ue during short-term cold spells. When temperatures
are between 0° and 32°F, flow (continuous pump
operation) must be maintained.
CAUTION: Do not use the heater to maintain water
temperatures just above freezing or for freeze protec-
tion. When heater is used during freezing weather,
care must be taken to avoid freeze-ups. Continuous
pump operation is a must. Additional protection may
be required. The heater is not warranted against
freeze-ups.
COLD CLIMATE: Prolonged operation with water
temperatures below 50°F is not recommended.
When starting the heater with water temperatures
below 50°F, operate the heater continuously until
higher temperatures are reached. Operating the
heater for prolonged periods with pool water below
50°F can seriously damage the heater, and is not cov-
ered by the warranty.
For cold climate areas, please follow the winterizing
procedures listed.
WINTERIZING THE POOL & SPA HEATER
Heaters installed outdoors in freezing climate areas
may be shut down for the winter. Observe the following
procedure for winterizing the heater:
1. Turn off gas valve, manual gas valve, and electrical
supply to the heater.
2. Open drain plug located on the inlet/outlet header,
(under water pipes). Remove the heat exchanger
inspection panel on the side opposite water piping
to gain access to the drain plug on the return head-
er. Open drain plug on return header.
3. For ASME Heaters only: Disconnect compression
fittings from the pressure switch and return header
that connects to the 1/4" copper tube and allow the
tube to drain.
Return Header
Drain Plug