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SECTION C: Installation
16
To complete the installation of the pool heater, the pool
thermostat needs to be installed in the main return wa-
ter line, upstream of the heater. This will ensure that
the heater will be energized at the right time.
Fig. 13: Single Pool Heater Application
Adjustment of the manual bypass valve is critical to
proper operation of the heater. The manual bypass
valve should be adjusted to achieve a minimum inlet
water temperature of 120°F and a system supply water
temperature below 140°F. When starting with a cold
pool, make initial adjustments. Make final adjustments
when pool water approaches desired temperature.
The use of a bypass is required for proper operation in
a pool heating application. Use the following instruc-
tions to set the manual bypass:
1. Turn on pump.
2. Turn on heater and wait until heater goes to full
fire.
3. With the heater operating at 100% firing rate, set
Valve A (the bypass) to ½ open position, and
Valve B to fully open position.
4. Adjust Valve A until the inlet water temperature is
120°F. NOTE: Opening the valve will increase
the temperature and closing the valve will decrease
the temperature.
5. If this process does not raise the inlet water tem-
perature to 120°F and Valve A is fully open, then
slowly throttle Valve B closed to increase the inlet
water temperature to 120°F.
Fig. 14: “H” Bypass Setting
Automatic Chlorinators and Chemical
Feeders
CAUTION: Combustion air must not be contaminated
by corrosive chemical fumes which can damage the
heater and void the warranty.
All chemicals must be introduced and completely di-
luted into the pool or spa water before being circulated
through the heater. Do not place chlorine tablets or
bromine sticks in the skimmer. High chemical concen-
trations 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.
NOTICE: High chemical concentrates from feeders
and chlorinators that are out of adjustment will cause
very rapid corrosion of the heat exchanger in the heater.
Such damage is not covered under 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 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.