9600 CB & HWG Service Manual
Page 19
NO CONTINUITY
( OHMS)
1. SWITCH OFF BOILER SWITCH
2. REMOVE BOTH TUBES FROM
STACK SWITCH AND DISCONNECT
ELECTRICAL WIRES
3. CHECK FOR CONTINUITY ACROSS
SWITCH TERMINALS
1. ATTACH TUBES DISCONNECTED
FROM STACK SWITCH TO U-TUBE
MANOMETER
2. SWITCH ON BOILER TO OPERATE
BLOWER
3. MANOMETER INDICATES 1.5" W.C.
OR GREATER
REPLACE STACK
SWITCH P/N 2400-110
RECONNECT STACK SWITCH
TUBES AND CHECK FOR
CONTINUITY BETWEEN STACK
SWITCH TERMINALS WITH
BLOWER OPERATING
CHECK FOR VENT OBSTRUCTIONS
CLEAR OBSTRUCTIONS &
RECONNECT TUBES & ELEC-
TRICAL WIRES TO STACK
SWITCH - START BOILER &
RUN THROUGH A FEW
CYCLES
STACK SWITCH OK
REPLACE STACK
SWITCH P/N 2400-110
CONTINUITY
(0 OHMS)
NO CONTINUITY
( OHMS)
CONTINUITY
(0 OHMS)
OBSTRUCTED
CLEAR
NO
YES
CHECK BLOWER
PAGE 20
NOTE:
CHECK TUBES ON STACK SWITCH FOR PROPER CONNECTIONS
TUBE CONNECTION CLOSEST TO YOU SHOULD CONNECT TO BARBED TEE FITTING ABOVE AIR ORIFICE.
CHECKING STACK SWITCH
(YOU MUST COMPLETE PAGE 16 FIRST)
