LAARS Mini-Therm JVS (Sizes 50-225) - Install and Operating Manual - Manual (Page 34)

LAARS Heating Systems Page 34
TURN GAS ON.
PILOT BURNER LIGHTS?
MAIN VALVE OPENS?
SYSTEM OK
IGNITER WARMS UP
AND GLOWS RED
PILOT VALVE
OPENS
START
• TURN GAS SUPPLY OFF
• SET THERMOSTAT TO
CALL FOR HEAT
SV9501/SV9601 IS
POWERED
(24 VAC NOMINAL)
YES
CHECK:
• LINE VOLTAGE POWER
• LOW VOLTAGE TRANSFORMER
• LIMIT CONTROLLER
• THERMOSTAT
• WIRING
• FAN PROVING SWITCH
ON COMBUSTION AIR BLOWER
UNPLUG IGNITER
MEASURE VOLTAGE AT
TWO BOTTOM TERMINAL OF
SV9501/SV9601
(24 VAC NOMINAL)
YES
YES
YES
YES
YES
NO
NO
NO
YES
NO
NO
NO
Troubleshooting Honeywell SV9501/SV9601
Hot Surface Pilot System (JVH only)
REPLACE IGNITER
REPLACE SV9501/SV9601
MEASURE VOLTAGE TO
SV9501/SV9601.
VOLTAGE MUST BE AT LEAST
19.5 VAC.
REPLACE IGNITER
REPLACE IGNITER SENSOR AND
RETAIN: RESTART TROUBLE-SHOOTING
SEQUENCE. DOES MAIN VALVE OPEN?
DISCARD OLD IGNITER SENSOR
NO
NO
NO
REPLACE
SV9501/
SV9601
CHECK
TRANS-FOR-
MER, LINE
VOLT SUP-
PLY
REPLACE
SV9501/
SV9601.
SAVE OLD
IGNIT-
ER-SENSOR
FOR
SERVICE.