Raypak 266A User Manual

Page 45

START

TURN GAS SUPPLY OFF.

TURN THERMOSTAT

(CONTROLLER) TO CALL

FOR HEAT

POWER TO PC BOARD?

(24 V NOMINAL)

YES

SPARK ACROSS

IGNITER/SENSOR GAP?

YES

TURN GAS SUPPLY ON

PILOT BURNER LIGHTS?

YES

MAIN BURNER LIGHTS?

YES

SYSTEM RUNS UNTIL

CALL FOR HEAT ENDS?

YES

CALL FOR HEAT ENDS

SYSTEM SHUTS OFF?

YES

TROUBLESHOOTING

ENDS

NOTE: Before troubleshooting, familiarize yourself with the start-up and check-out
procedure.

Check line voltage power, low voltage transformer, limit controller, thermostat
(controller) and wiring.

Pull ignition lead and check spark at PC board.
Spark Okay?
YES

• Check ignition cable, ground wiring, ceramic insulator and gap, and correct.
• Check boot of the ignition cable for signs of melting or buckling. Take protective

action to shield cable and boot from excessive temperatures.

• Check that all manual gas valves are open, supply tubing and pressures are

good, and pilot burner orifice is not blocked.

• Check electrical connections between PC board and pilot operator on gas control.
• Check for 24 VAC across PV-MV/PV terminals on PC board. If voltage is okay,

replace gas control; if not, replace PC board.

NOTE: If PC board goes into lockout, reset system. Lockout is used on L.P.G.
models.

• Check for 24 VAC across MV-MV/PV terminals. If no voltage, replace module.
• Check electrical connections between PC board and gas control. If okay, replace

gas valve or gas control operator, i.e. pilot gas valve, flow switch etc.

NOTE: IF PC board goes into lockout, reset system.

• Check continuity of ignition cable and ground wire.

NOTE: If ground is poor or erratic, shutdowns may occur occasionally even though

operation is normal at the time of checkout.

• Check that pilot flame covers flame rod and is steady and blue.
• If checks are okay, replace PC board.

• Check for proper thermostat (controller) operation.
• Remove MV lead at module; if valve closes, recheck temperature controller and

wiring; if not, replace gas valve.

ELECTRICAL - ELECTRONIC IGNITION IID

WARNING HIGH VOLTAGE

For qualified technicians ONLY

NOTE:

Some heaters may be equipped with an ignition module that shuts off pilot

gas if pilot fails to light. To reset, interrupt power to heater.

Replace the PC board.

This manual is related to the following products:

406A