LAARS HP-M2 Series - Installation, Operation and Maintenance Instructions - Manual (Page 30)

Page 30 LAARS Heating Systems
Figure 25. Testing Limit Circuit (You Must Complete Figure 24 First).
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RED
RED
CN6
"CONTROL"
LIMIT CIRCUIT APPEARS OK -
RECYCLE BOILER A FEW TIMES AFTER
PLUGGING IN "CONTROL" PLUG
CHECK FOR CONTINUITY ACROSS
OPERATING CONTROL LIMITS
CHECK FOR CONTINUITY ACROSS
SAFETY LIMIT CONTACTS
REPLACE SAFETY LIMIT
REPLACE OPERATING
CONTROL
ALL LIMITS OK.
BOILER SHOULD CYCLE PROPERLY
ON A CALL FOR HEAT OR HOT WATER CHECK FOR CONTINUITY ACROSS
PRESSURE SWITCH CONTACTS
(BOILER PRESSURE ABOVE 12 PSI)
NOTE: AFTER COMPLETING LIMIT CIRCUIT TESTING, RECYCLE BOILER A FEW TIMES. IF BOILER DOES NOT
RECYCLE CONNECT A JUMPER TEMPORARILY BETWEEN THE RED WIRES. IF BOILER STARTS REMOVE JUMPER
AND TEMPORARILY JUMP EACH SAFETY CONTROL UNTIL THE DEFECTIVE CONTROL IS LOCATED. NEVER
LEAVE A SAFETY CONTROL JUMPED.
CONTINUITY
CONTINUITY
CONTINUITY
NO CONTINUITY
NO CONTINUITY
VIOLET
YES
PUMP OPERATES
REPLACE
PRESSURE
SWITCH
CHECK PUMP
(FIGURE 30)
NO
Р Р
Р
NO CONTINUITY
Р
Р
Р
Р
Р
YES
NO - UNPLUG CN6 FROM
BOILER CONTROL AND
TEST AS INDICATED
Í
1. SWITCH BOILER ON
2. CHECK FOR 24V AT PIN #6
NOTE: PLUG ORIENTATION MAY
DIFFER FROM DIAGRAM
OUT OF
PRODUCTION