Raypak 336A User Manual download pdf (Page 41)

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 may be equipped with (2) thermal

cut-off devices to prevent flame roll-out in the event the

heat exchanger becomes blocked. The first is stan-

dard on all models and 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 optional “auto reset” type roll-out switch

that resets itself after a few minutes. Excessive restric-

tion in the heat exchanger flue passage may cause

either of the two switches to disable the heater.

Fig.# 9412

LOW NOx POOL HEATERS

NOTE:

Door must be in place for proper operation.

Manual Reset

Switch

Optional Auto

Reset Switch

Fig.# 9439

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Raypak 336A User Manual Page 41

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