LAARS HP-M2 Series - Installation, Operation and Maintenance Instructions - Manual (Page 33)

H Series Page 33
CLEAR
1. TURN OFF BOILER SWITCH
2. REMOVE BOTH TUBES FROM
STACK SWITCH AND DISCONNECT
ELECTRICAL WIRES
3. CHECK FOR CONTINUITY ACROSS
SWITCH TERMINALS
NOTE: CHECK TUBES ON STACK SWITCH FOR PROPER CONNECTIONS
1. ATTACH TUBES DISCONNECTED
FROM STACK SWITCH TO U-TUBE
MANOMETER
2. TURN 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 &
ELECTRICAL WIRES TO
STACK SWITCH - START
BOILER & RUN THROUGH A
FEW CYCLES CHECK BLOWER
FIGURE 27
STACK SWITCH OK
REPLACE STACK
SWITCH P/N 2400-110
CONTINUITY
(0 OHMS)
NO CONTINUITY
( OHMS)
CONTINUITY
(0 OHMS)
OBSTRUCTED
NO
YES
Р
Р Р
Р
Р Р
Р
Р
NO CONTINUITY
( OHMS)
Figure 28. Checking Stack Switch (You Must Complete Figure 27 First).
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