Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS - Manual (Page 7)

FREEZE PROTECTION
Although this pool heater is CSA design certified for outdoor
installations - such installations are not recommended in areas
where the pool heater will be operated in the winter months
and the danger of freezing exists. Proper freeze protection
must be provided for outdoor installations; pool heaters
installed in unheated mechanical rooms or where temperatures
may drop to the freezing point or lower. If freeze protection
is not provided for the system, a low ambient temperature
alarm is recommended for the mechanical room. Damage to
the pool heater by freezing is non-warrantable.
1. Pump Operation - MOST IMPORTANT - This pool heater
is designed for continuous operation of the filter system
pump when the burners are firing. If the system pump
does not run continuously, an additional pump must be
installed to provide constant circulation through the pool
heater. The constant flow of warm pool water can help
prevent freezing.
2. Anytime the temperature measured at the sensor drops
below 45°F, the temperature control turns on the pump to
circulate the water, if the pump option is installed.
3. Location - Indoor pool heaters must be located in a room
having a temperature safely above freezing [32°F(0°C)].
4. Outdoor Pool Heater Installation - Use extreme caution to
prevent freezing. A snow screen should be installed to
prevent snow and ice accumulation around the pool heater
or its venting system.
5. Shut-Down and Draining - If for any reason, the pool
heater is to be shut off, the following precautionary
measures must be taken:
1. Shut off gas supply.
2. Shut off water supply.
3. Shut off electrical supply.
4. Drain the pool heater completely. Remove the
threaded drain plugs from the inlet and outlet sides of
the front header on the heat exchanger (see Figure 3).
Blow all water out of the heat exchanger. Leave
drains open until Spring.
5. Drain pump and piping.
Figure 3 – Draining Pool Heater
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CAUTION: Under no circumstances should
the mechanical room ever be under a negative
pressure. Particular care should be taken where
exhaust fans, attic fans, clothes dryers,
compressors, air handling units, etc., may take
away air from the pool heater.
COMBUSTION AND VENTILATION
AIR
Provisions for combustion and ventilation air must be in
accordance with Section 5.3, 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
pool heater is installed with conventional venting or sidewall
venting.
Combustion Air Filter
This pool heater has a standard air filter located at the
combustion air inlet. This filter helps ensure clean air is used
for the combustion process. Check this filter every month and
replace when it becomes dirty. The filter size on the 500,000
- 750,000 units is 12" x 12" x 1" (30.5cm x 30.5cm x 2.5cm)
and 16" x 16" x 1 (40.6cm x 40.6cm x 2.5 cm) on the 990,000
- 2,070,000 units. You can find these commercially available
filters at any home center or HVAC supply store.
Use filters rated for a maximum face velocity of 300 ft/min at
a maximum pressure drop of 0.5
" water column (w.c.) Pleated
filters may be used provided they meet these specifications.
Installation and Service Manual
7
500,000 CFK3302
650,000 CFK3303
750,000 CFK3304
TABLE - A
COMBUSTIBLE FLOOR KITS
Input Btu/hr Kit Number