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PILOT BURNER FLAME (IID UNITS)
PILOT BURNER FLAME (STG PILOT UNITS)
CONTROLS
Check all controls to see that they are operational.
To check electronic safety (IID Models) , turn off main
burner. Observe pilot burner when shutting off pilot gas.
Ignition spark should go on. Main gas valve will also drop
out.
High Limit Switch - to check high limit switch, turn
dial setting down to a point slightly below the temperature
of the water leaving the heater. The reset button should
snap out and the burner should shut off. Reset dial to 30°F
to 40°F above desired operating temperature, and push
reset button. Burner should light.
LOW NOx HEATERS Sizes 181 to 401
The Raypak Low Nox Heater is offered as a model W1-
ON-OFF firing.
The boilers are certified and tested under the ANSI
Z21.10.3 Standards for hot water heaters.
The boiler should be installed to meet all local codes,
the National Fuel Gas Code Z223.1 and with the
National Electrical Code, ANSI/NFPA 70.
23
Fig # 9361
OPERATION
On call for heat, the ignition system, consisting of an
electronic spark module, gas pilot system is energized.
Providing pilot is proven blower will start running, the
main gas valve will open and the boiler will operate.
When the operating control is satisfied the boiler will
shut down.
START-UP PROCEDURES (S8610B)
1.Turn on power to the boiler with gas supply off.
2.Check ignition module as follows:
a. Set the thermostat or controller to call for heat.
b. Watch for continuous spark at the pilot burner.
c. Check the ignition spark operation. Time must be
within the lockout timing period (15 or 90 seconds).
d. Turn control down to end call for heat and wait 60
seconds on lockout models before beginning step
3.
3.Turn on gas supply.
4.Set controller to call for heat.
5.System should start as follows:
a. Spark will turn on and pilot gas valve will open and
the blower will begin running.
b. Heater will operate until call for heat is satisfied.
BURNER ADJUSTMENT
This burner assembly does not require any primary air
adjustments.
VISUAL INSPECTION
Flame 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. In case flame lifting is observed on the burner,
check gas pressure on manifold and static pressure in
plenum. Gas pressure in manifold should be 3.9" W.C.
and static pressure in plenum should be greater than
0.5" W.C.
ELECTRICAL
Be sure that electrical service to the boiler has proper
overload fuse or circuit breaker protection, wire size
and connections which comply with all applicable
codes.
HIGH GAS PRESSURE SWITCH
Pressure switch senses high pressure and automati-
cally shuts down burner if abnormal pressure exists.
\Fig. #8236.0
PRESSURE
SWITCH
GAS MANIFOLD