27
06/21
8390-016A
FIREBOX VACUUM & VACUUM SWITCH TROUBLESHOOTING
FIREBOX VACUUM LOW OR VACUUM SWITCH NOT WORKING.
VACUUM SWITCH
TURN THE APPLIANCE ON
APPLIANCE
REPAIRED
SET MULTIMETER
TO Ω AND CONNECT TO
THE (2) TERMINALS ON
THE VACUUM SWITCH.
WITH EXHAUST BLOWER
RUNNING, METER SHOULD
SHOW LESS THAN 0.5 Ω
NO
CHECK DOOR
GASKET, CLEAN FIREBOX
AND VENTING SYSTEM.
CHECK WIRE AND HOSE
CONNNECTION TO
SWITCH. DOES SWITCH
CLOSE TO LESS THAN
0.5 Ω WITH EXHAUST
BLOWER?
YES
REPLACE VACUUM SWITCH
YES
NO
VACUUM SPECS WITH DIAL CONTROL ON “0” TRIM
COLD APPLIANCE, PELLETS IN HOPPER, BLOWER AT MAX:
.19 TO .30 inches of WC
POWER LEVEL 1:
.11 TO .26 inches of WC
POWER LEVEL 2:
.11 TO .25 inches of WC
POWER LEVEL 3:
.12 TO .25 inches of WC
POWER LEVEL 4:
.13 TO .23 inches of WC
POWER LEVEL 5:
.15 TO .22 inches of WC
SHUTDOWN:
.17 TO .25 inches of WC
Test Locations and Readings on next page.
