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1
Determine unit location
Anytime the inlet temperature drops below 45°F, the
control turns on the pump contact. If the inlet temperature is
below 37°F, and the unit is in the ON Mode, the fi rst stage will
fi re.
Location
Locate indoor pool heaters in a room having a temperature
safely above freezing [32°F (0°C)].
A mechanical room operating under a negative
CAUTION
⚠
draft pressure may experience a down draft in
the flue of a pool heater when it is not firing.
The cold outside air pulled down the flue
may freeze a heat exchanger. This condition
must be corrected to provide adequate freeze
protection.
Hydronic systems anti-freeze
Freeze protection for a pool heater using an indirect coil can
be provided by using hydronic system antifreeze. Follow the
appliance manufacturers instructions. Do not use undiluted or
automotive type antifreeze (see page 43).
Outdoor pool heater installation
A snow screen should be installed to prevent snow and ice
accumulation around the unit or its venting system.
Combustion and ventilation air
Provisions for combustion and ventilation air must be in
accordance with Air for Combustion and Ventilation, of the
latest edition of the National Fuel Gas Code, ANSI Z223.1, in
Canada, the latest edition of CAN/CGA-B149 Installation Code
for Gas Burning Appliances and Equipment, or applicable
provisions of the local building codes.
Provide properly-sized openings to the equipment room to
assure adequate combustion air and proper ventilation when
the unit is installed with conventional venting or sidewall
venting.
Combustion air options
Under
⚠ CAUTION
the equipment room ever be under
a negative pressure.
should be taken where exhaust fans, attic
fans, clothes dryers, compressors, air
handling units, etc., may take away air
from the unit.
This unit has four combustion air options.
1. Outside Combustion Air, No Ducts
You can direct outside combustion air to this unit using either
one or two permanent openings.
One Opening
The opening must have a minimum free area of one square
inch per 3000 Btu input (7 cm
opening within 12" (30 cm) of the top of the enclosure (see FIG.
1-2).
10
no
circumstances
should
Particular care
2
per kW). You must locate this
Installation & Operation Manual
Figure 1-2_Outside Combustion Air - Single Opening
Two Openings
The combustion air opening must have a minimum free area of
one square inch per 4000 Btu/hr input (5.5 cm
must locate this opening within 12" (30 cm) of the bottom of the
enclosure (see FIG. 1-3).
The ventilation air opening must have a minimum free area of
one square inch per 4000 Btu/hr input (5.5 cm
must locate this opening within 12" (30 cm) of the top of the
enclosure.
Figure 1-3_Outside Combustion Air - Two Openings
2. Outside Combustion Air, Using Ducts
You can direct outside combustion air to this unit using two air
ducts to deliver the air to the mechanical room (see FIG. 1-5).
Each of the two openings must have a minimum free area of one
square inch per 2000 Btu input (11cm
3. Combustion Air from Interior Space
You can direct combustion air to this unit using air from an
adjoining interior space. You must provide two openings from
the mechanical room to the adjoining room (see FIG. 1-4).
Each of the two openings must have a net free area of one square
inch per 1000 Btu input (22cm
square inches (645cm
2
).
Figure 1-4_Combustion Air from Interior Space
2
per kW). You
2
per kW). You
per kW).
2
2
per kW), but not less than 100
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