General trouble shooting – LAARS 9600 CB & HWG - Service Manual User Manual

Page 16

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Page 16

LAARS Heating Systems

PURGE - SEE PAGE 18
VALVE/FLAME SEE PAGE 21

1. LIMIT CIRCUIT OPEN

SEE PAGE 17

2. NO CALL FOR HEAT/

HOT WATER

REPLACE BOILER
CONTROL
2400-224

REPLACE TRANSFORMER
AND RUN BOILER
THROUGH A FEW CYCLES

HAVE QUALIFIED
ELECTRICIAN
REPAIR FAULT IN
WIRING TO THE
BOILER

CHECK FOR VOLTAGE (24
VAC) BETWEEN YELLOW
WIRES AT BACK OF "VAC
24XFMR" CONNECTOR ON
BOILER CONTROL

GREEN LIGHT COMES ON

1. IS SERVICE SWITCH ON?
2. IS CIRCUIT ON?
3. ARE FUSES OR CIRCUIT

BREAKER OK?

CORRECT AND
RECYCLE BOILER
RUN THROUGH A
FEW CYCLES

CHECK FOR VOLTAGE
(120 VAC) BETWEEN
BLACK AND WHITE
WIRES AT BACK OF "120
VAC" CONNECTOR ON
BOILER CONTROL

DID BOILER RUN THROUGH A
COMPLETE CYCLE AS DE-
SCRIBED IN SEQUENCE OF
EVENTS PAGE 20

TEST LIMIT
CIRCUIT
PAGE 17

PUMP OPERATES
(120 V TO PUMP)

REPLACE
2400-224

CHECK
STACK
SWITCH

GENERAL TROUBLE SHOOTING

YES

NO

YES

NO

NO

YES

OK

NO

NO

0 VOLTS

120
VOLTS

0
VOLTS

24 VOLTS

*POOR SWITCH CONTACT ON RELAYS, ZONE VALVES, OR THERMOSTATS CAN CAUSE A FLASHING
GREEN LIGHT ON JOHNSON CONTROLS G856DBG - 5201.

AFTER 5 MINUTES ARE ANY
RED LIGHTS FLASHING

YES

YES

NO

REPLACE

DEFECTIVE

RESET BOILER CONTROL BY SWITCHING OFF

POWER AT SIDE OF UNIT FOR 15 SECONDS

REPLACE BOILER
CONTROL 2400-224

REFER TO FLOW
CHART FOR SPECIFIC
PROBLEM

OK

YES

CORRECT

OPEN

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