Belshaw Brothers TG 50 Troubleshooting Guide, Impinger Cti, Symptom, Possible Cause, Evaluation

TROUBLESHOOTING GUIDE

	IMPINGER CTI
SYMPTOM	POSSIBLE CAUSE	EVALUATION
Oven fan will not run	Incoming Power Supply	Check breakers, reset if required Check power plug
		to be sure it is firmly in the receptacle (if applicable).
		Measure the incoming power, call Power Co., if
		needed
	Oven Fan Fuses, 5 Amp	Check and/or replace
	Fuse Holder	Check and/or replace
	High Limit Thermostat	Check for voltage on both sides of the switch.
	Control Box (Note: High	Terminals are normally closed. If open, reset and
	Limit not used in ovens	test oven for proper operation. If thermostat and
	S/N 3000352)	below.) will not hold and control box temperature is
		not exceeding 140°F (60°C), replace thermostat.
	Fan Switch	Check continuity between switch terminals. Check
		and insure good wire connections
	20 Minute Time Delay	Check for supply voltage at terminal #1 to ground on
		the 20-minute timer. If no voltage is present, trace
		wiring back to power supply. If voltage is present at
		terminal #1, check for supply voltage at terminal #2 to
		ground. If no voltage is present, and the oven fan
		switch is closed, replace the 20-minute timer.
	Main Fan Relay	Check continuity of coil. Check for power to relay
		coil. Visually check for contact pull in and contact
		condition. Check for voltage across relay terminals.
	Fan Motor	Check for opens, shorts, or grounds. WITH POWER
		OFF: Turn fan blade to check for locked rotor.
	Capacitor	Check for opens, shorts, or grounds. WARNING
		Capacitor has a stored charge, discharge before
		testing.
No main fan cool	20-Minute Timer	Check for supply voltage at terminal #2 and #3 while
down		main fan is running. Turn off fan switch and supply
		voltage should continue to be present for 20 min. at
		terminal #2. Replace as needed.
Main fan continues to	20 Minute Timer	NOTE: On/Off operation of fan switch will reset timer
run after cool down		to 20 minutes. If timer is accidentally reset, turn off
		main breaker to cancel. If voltage continues to be
		present at terminals 2 and 3 after 20 minutes, verify
		fan switch contacts have opened, replace timer as
		needed.
No control box	Fan Switch	WITH POWER OFF: Close switch and check for
cooling		continuity across switch terminals.
	20 Minute Timer	See "Main Fan Motor will not run."
	Cooling Fan	Check for voltages at the fan motor, if present,
		replace defective fan motor.

November 1999 31 COUNTER TOP IMPINGER