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NOTE: For automatic temperature adjustment, a
Cold Water Run (CWR) system can be used instead
of a manual bypass. See Fig. 10.
CAUTION: Combustion air must not be contami-
nated by corrosive chemical fumes which can
damage the heater and void the warranty.
Winterizing Your Heater
Heaters installed outdoors as pool heaters in freezing
climate areas should be shut down for the winter. To
shut down the heater, turn off manual main gas valve
and main gas shut-off. Close isolation valves. Drain
the heater using the hose bibs located on the bottom
of the heat exchanger.
NOTE: There are 2 separate drains on the MVB
that must BOTH be drained to protect the heat
exchanger. These are both accessible by removing
the lower front door from the heater. Drain any
piping of all water that may experience below-
freezing temperatures.
Recommended Level(s)
Water Temperature
pH
Total Alkalinity (ppm)
Calcium Hardness (ppm)
Salt (ppm)
Free Chlorine (ppm)*
Total Dissolved Solids
(ppm)
*Free Chlorine MUST NOT EXCEED 5 ppm!
All manuals and user guides at all-guides.com
Fiberglass Pools
68-88°F (20-31°C)
7.3-7.4
120-150
200-300
6000 Maximum
2-3
3000 Maximum
Table H: Water Chemistry
18
Pool/Spa Water Chemistry
CAUTION: Corrosive water voids all warranties.
NOTE: Chemical imbalance can cause severe
damage to your heater and associated equipment.
Chemical imbalance can cause severe damage to the
pool heater and associated equipment. Maintain the
water chemistry according to the chart below. If the
mineral content and dissolved solids in the water
become too high, scale forms inside the heat exchang-
er tubes, 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
heater. Heat exchanger damage resulting from chem-
ical imbalance is not covered by the warranty.
For your health and the protection of your pool equip-
ment, it is essential that your water be chemically
balanced. The following levels must be used as a
guide for balanced water.
Occasional chemical shock dosing of the pool or spa
should not damage the heater providing the water is
balanced.
Automatic chemical dosing devices and salt chlorina-
tors are usually more efficient in heater water, unless
controlled, they can lead to excessive chlorine level
which can damage your heater.
Fiberglass Spas
89-104°F (31-40°C)
7.3-7.4
120-150
150-200
6000 Maximum
2-3
3000 Maximum
Other Pool and Spa
Types
68-104°F (20-40°C)
7.6-7.8
80-120
200-400
6000 Maximum
2-3
3000 Maximum
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