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POOL & SPA WATER CHEMISTRY
Chemical imbalance can cause severe damage to
your heater and associated equipment. Maintain
your water chemistry according to the chart on page 2.
If the mineral content and dissolved solids in the water
become too high, scale forms inside the heat exchang-
er tube, reducing heater efficiency and damaging the
heater. If the pH drops below 7.2, this will cause cor-
rosion of the heat exchanger and severely damage the
Heat exchanger damage resulting from
heater.
chemical imbalance is not covered by the warran-
ty.
AUTOMATIC CHLORINATORS AND
CHEMICAL FEEDERS
All chemicals must be introduced and completely dilut-
ed into the pool or spa water before being circulated
through the heater. Do not place sanitizing chemicals
in the skimmer.
High chemical concentrations will
result when the pump is not running (e.g. overnight).
Chlorinators must feed downstream of the heater and
have an anti-siphoning device to prevent chemical
back-up into the heater when the pump is shut off. A
check valve should be installed between the heater
outlet and the chlorinator.
See plumbing diagrams on page 30 and 31.
NOTE: High chemical concentrates from feeders and
chlorinators that are out of adjustment will cause rapid
corrosion to the heat exchanger. Such damage is not
covered under the warranty.
COLD WEATHER OPERATION
IMPORTANT FREEZE INFORMATION
MODERATE CLIMATE: Heater operation can contin-
ue during short-term cold spells. When temperatures
are between 0°F 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.
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 follow-
ing procedure for winterizing the heater:
1. Turn off gas valve, manual gas valve, and electri-
cal supply to the heater.
2. Open the drain valve located on the inlet/outlet
header (at the lowest point). Pull the PRV handle
upwards to allow air in while the water drains
through the valve.
8
Operating the
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