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DO BURNERS
FUNCTION?
_.o
I DOES IGNITER WARM
UP AND GLOW RED?
(INTERMITTENTLY)
L IS FAN RUNNING?
NO
,r
JUMPER "rHERMOSTAT
AT CONNECTIONS
,,G,, AND -y,, ON R8285
DOES BOILER RUN?
!l YES
CORRECT
THERMOSTAT
PROBLEM
SEETABLE 7 ]
YES
i CHECK FOR 24VAC AT PRESSURE
SWITCH 'NO" TERMINAL TO GROUND
IF NO VOLTAGE, CHECK FOR:
BLOCKED OR CRACKED SUCTION
TUBING,
. FAN NOT GENERATING ADEQUATE
SUCTION PRESSURE*
. DEFECTIVE PRESSURE SWITCH,
CHECK FOR 24VAC AT R4222 RELAY
BLUE WIRES TO GROUND:
IF NO VOLTAGE AT EITHER BL WIRES,
CHECK FOR BROKEN/LOOSE WIRE
. IF NO VOLTAGE AT ONLY ONE BL WIRE,
CHECK FOR 120VAC BETWEEN R4222
RELAY SLACK AND WHITE WIRES IF
SO, REPLACE RELAY.
CHECK FOR 24VAC AT FLAME ROLL-OUT
SWITCH, IF SWITCH IS BLOWN, CORRECT
CAUSE OF ROLL-OUT BEFORE
REPLACING SWITCH.
NO_ CHECK FOR 120VAC HIGH LIMITCONTROL IF
POWER ATONETERMINAL BUT NOT BOTH,
REPLACE LIMITCONTROL,
,l
ICHECK FOR 24VAC AT PRESSURE SWITCH
J TERMINAL S .C,, AND "NC, TO GROUND:
olF VOLTAGE AT "NC" BUT NOT "C',
PRESSURE SWITCH IS STUCK IN
RUNNING POSITRON, CHECK FOR BLOCKED
AIRTUBE IF OKAY, REPLACE PRESSURE
SWITCH,
• IF NO VOLTAGE AT EITHER PRESSURE
SWITCHTERMINAL C OR NC"TO
GROUND, CHECK FOR 120VAC INCOMING
ROWER INSIDE JUNCTION BOX, IF PROPER
INCOMING POWER, REPLACE R8285+
INSET A
END VIEW OF
24 VOLT CONTROL
THERMOSTAT HARNESS
CONNECTOR
VOLTS
24 VOLT
COMMD 24 VOLT
VOLTS HGT
CHECK FOR DAMAGED GR MISSING
TERMINALS _N CONNEBTGR
• TURN OFF GASIUPPLY
• ASSURE GAS VALVE SWITCH IS
fN 'ON, POSITION
• DISCONNECT SYSTEM CONTROL
HARNESS
• SET THERMOSTAT TO CALL
FOR HEAT
CHECK FOR PROPER VOLTAGE _ CHECK:
AT CONTROL HARNESS (SEE INSET _ • LINE VOLTAGE POWER
A) VOLTAGE SHOULD BE 24V • LOW VOLTAGE TRANSFORMER
BETWEEN THERMOSTAT AND • LIMIT CONTROLLER
24V COMMON AND 24V BETWEEN •THERMOSTAT
24V COMMON AN D 24V HOT • WIRING
_ YES
I, ,:RW RMSUPA°B
+
NOTE; tGNITER WILL CYCLE OFF
AND BACK ON ONCE DURING THE
90 SECOND IGNmON TRIAL
I YES
[ "TURN ON GAS SUPPLY ]_
• PILOT BURNER LIGHTS
YES
INSET B
; ES
IREDONNECTP'LDTBURNERI
]REPLACE,ON,TE, PLAOEROOAS__LYICAOLE
IREOONNEC--,LOTBURNERCABLEJ
"CHECKTHATP'LOTOAS'BF OW'NG.EP ACEGA VA VEl
WAIT TO ASSURE PILOT GAS TUBING
IS PURGED
yES
•MEASUREVOLTAGEBETWEEN._N._._CHEC_TB..S_DRMERANBI
HOT AND 24V COMMON LEADS TO GAS LINE VOLT SUPPLY
VALVE MUST MEASURE AT LEAST
195 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
[REPLABO'GN'TEOFLAMEROBASSOMBL 1
r
IMA,NV_L_EOPENS_.O _
MAiN BURNER LIGHTS
I YEN
L SYSTEM IS OKAY I
GOOD CONTACT WITH PILOT BURNER CYCLE THER STAT OFF ANB BACK ON
FLAME ROD
• CHECK FOR GOOD ELECTRICAL
CONNECTION THROUGH THE PILOT
• IF BOTH OFTHE ABOVE ARE GOOD, iF MA_N BURNERS DO NOT LIGHT.
REPLACE IGNITER/FLAME ROD REPLACE GAS VALVE
ASSEMBLY
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