PEERLESS MI SERIES - Page 31

START
I • TURN OFF GAS SUPPLY
• ASSURE GAS VALVE SWITCH IS
iN "ON" POSITION
• DISCONNECT SYSTEM CONTROL
HARNESS
• SET THERMOSTAT TO CALL
FOR HEAT
l
CHECK FOR PROPER VOLTAGE NI NO _[
AT CONTROL HARNESS (SEE INSET
I1
A). VOLTAGE SHOULD BE 24V
BETWEEN THERMOSTAT AND
24V COMMON, AND 24V BETWEEN
24V COMMON AND 24V HOT.
YES
ii i: ',Fo L
l
I, .:W,:oW RMSUPANDQ
+
NOTE: iGNITER WILL CYCLE OFF
AND BACK ON ONCE GURING THE
90 SECOND IGNITION TRIAL
I YES
• TURN ON GAS SUPPLY _=_
• PILOT BURNER IJGHTS
YES
r
I MAIN VALVE OPENS AND
MAIN BURNER LIGHTS
YES
CHECK:
• LINE VOLTAGE POWER
• LOW VOLTAGE TRANSFORMER
• LIMIT CONTROLLER
• THERMOSTAT
•WIRING
• VENT DAMPER IS OPEN AND END
SWITCH MAKES
INSET A
UNPLUG PILOT BURNER CABLE.
MEASURE VOLTAGE AT GAS VALVE
I '
HSI ELEMENT OUTPUT (SEE INSET B)
24V NOMINAL
I YEs
IREP CE'GN'TE MEROOA--OLYI
I RECONNECT PILOT BURNER CABLE I
END VIEW OF
24 VOLT CONTROL
THERMOSTAT HARNESS
CONNECTOR
VOLTS
24 VOLT 24 VOLT
COMMO
VOLTS HOT
CHECK FOR DAMAGED OR MISSING
TERMINALS IN CONNECTOR
INSET B
REPLACE GAS VALVE I
I
I RECONNECTPILOTBURNER I
CABLE
• CHECK THAT PILOT GAS IS FLOWING. REPLACE GAS VALVE
WAIT TO ASSURE PILOT GAS TUBING
IS PURGED,
YES
,NO,
• MEASURE VOLTAGE BETWEEN 24V _ CHECK TRANSFORMER AND
HOT AND 24V COMMON LEADS TO GAS I i LINE VOLT SUPPLY
VALVE. MUST MEASURE AT LEAST
19.5 VAC WITH IGNITER POWERED.
SEE INSET A TO IDENTIFY PROPER
LEAD. THIS CHECK MUST BE DONE
WITH THE GAS VALVE CONNECTED
AND IGNITER POWERED,
YES
I REPLACE IG NITER/FLAM E ROD ASSIEMBLY ]
CYCLE THERMOSTAT OFF AND BACK ON I
SYSTEM IS OKAY
I MAIN BURNER LIGHTS _1 REPLACE GAS VALVE
• CHECK THAT PILOT FLAME MAKES
GOOD CONTACT WITH PILOT BURNER
FLAME ROD.
• CHECK FOR GOOD ELECTRICAL
CONNECTION THROUGH THE PILOT
TUBING
• IF BOTH OF THE ABOVE ARE GOOO,
REPLACE IGNITER/FLAME ROO
ASSEMBLY.
I I
I
I
Figure 27: Intermittent Ignition System Troubleshooting Sequence
28