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The Low NOx pool heaters are certified and tested
under the ANSI Z21.56/CSA 4.7 Standard for Gas-
Fired Pool Heaters.
The heater should be installed to meet all local codes,
and the latest editions of the National Fuel Gas Code
Z223.1 and the National Electrical Code, ANSI/NFPA
70.
OPERATION
On call for heat, the ignition system, consisting of an
electronic spark module, gas valve and pilot system, is
energized. Providing the pilot is proven, the blower
will start running, the main gas valve will open and the
heater will operate. When the operating control is sat-
isfied the heater will shut down.
START-UP PROCEDURES
1. Turn on power to the heater with gas supply off.
2. Turn on gas supply.
3. Set controller to call for heat.
4. System should start as follows:
a. Spark will turn on, pilot gas valve will open, and
the blower will begin running.
b. Once the blower provides pressure, the main
gas valve will open.
c. Heater will operate until call for heat is satisfied.
BLOWER ADJUSTMENT
This Low NOx pool heater is equipped with a combus-
tion air plate (baffle) mounted on the air intake to the
combustion air blower. The baffle has a hole that is uti-
lized to control the air inlet to the blower.
When the combustion air setting is proper
, there will be
some lifting of the flames on some areas of the burner
deck under cold-start conditions. After about five min-
utes of operation, the flames should settle down and
blue tips should become visible. Lifting of flames
beyond five minutes would indicate too much combus-
tion air.
VISUAL INSPECTION
Flames can be observed through the slot opening
above the plenum. Flame color is blue and evenly
spread on the top surface of the burner. At least every
three months a visual inspection should be made of
the burners.
ELECTRICAL
Be sure that electrical service to the heater has prop-
er overload fuse or circuit breaker protection, wire size
and connections which comply with all applicable
codes.
FLAME ROLL-OUT SAFETY SWITCH
Low NOx heaters are equipped with (2) thermal cut-off
devices to prevent flame roll-out in the event the heat
exchanger becomes blocked. One is a "manual reset"
type roll-out switch that must be reset by a service
technician after any over-temperature conditions have
been fixed. The second is an “auto reset” type roll-out
switch that resets itself after a few minutes. Excessive
restriction in the heat exchanger flue passage may
cause any of the two switchs to disable the heater.
Fig.# 9412
LOW NOx POOL HEATERS
NOTE:
Door must be in place for proper operation.
Manual Reset
Switch
Auto Reset
Switch
Fig.# 9439