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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 plug located on the In/Out header,
under the water pipes.
In/Out Header
Drain Plug
Fig. 25: In/Out Header Drain Plug Location
3. Remove the 2 wires from the water pressure
switch and unscrew the water pressure switch to
break any vacuum in the system. Remove the
pressure switch and dry it before re-installing.
Excessive moisture in the pressure switch may
freeze, damaging the switch.
MAINTENANCE
The following preventative maintenance is to be per-
formed one month after start-up and semi-annually
thereafter.
1. Inspect top of heater and drafthood for soot, a
sticky black substance around finned tubes and
"V" baffles, and open flue gas passageways. Any
visible soot should be cleaned for proper opera-
tion. See the De-sooting Procedure in the Service
Section.
2. Clean main burners and pilot burner of dust and
lint.
3. Inspect and operate all controls, gas valve and
pressure relief valve (if equipped).
4. Make visual check of the burner and pilot flames.
Flame pattern on the main burner and pilot is illus-
trated in the Post Start-Up Inspection section.
Yellow flame means restriction of the air openings.
Lifting or blowing flame indicates high gas pres-
sure. Low flame means low gas pressure. Should
these occur, shut the heater off and contact your
gas supplier or qualified service agency.
5. On indoor heaters, clean room intake openings to
ensure adequate flow of combustion and ventila-
tion air.
6. Keep area around heater clear and free from com-
bustible materials, gasoline and other flammable
and corrosive vapors and liquids.
SERVICE
Water Pressure Switch
The water pressure switch, ensures that the heater
operates only when the filter pump is in operation. It is
located on the In/Out header. It is factory set at 1.75
PSI for deck-level installations. When the heater is
located below the level of the spa or pool, it may be
necessary to adjust the pressure switch to compen-
sate for the no-flow static head. If it is necessary to
adjust the water pressure switch, utilize the following
procedure.
CAUTION: Do not adjust the pressure switch until
all air has been evacuated from the system and the
water flow rate meets the requirements listed in
Table F.
Water Pressure Switch Adjustment
Fig. 26: Water Pressure Switch Adjustment
1. With pump and heater on, turn adjustment knob
clockwise until a click is heard from the gas valve.
21
Adjustment Knob
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