AUGUST 29, 2014
6
M24G & M36G GAS BOILERS
WATER CONTROL BOARD TESING PROCEDURE
This test procedure is to be used to determine if the con-
trol is working properly. It is not intended to determine why
the control may have failed.
If testing shows that the control is operating properly,
check all probe and solenoid wiring and the condition of
the electrodes in the steam chamber.
Contact the factory if the boiler still does not operate prop-
erly after completing the testing.
Tools Needed:
•
Digital or Analog V-O-M meter.
•
Alligator clip type test jumpers (2 sets min.).
Turn Off Power to Control:
•
Use V-O-M to verify there is no power at terminals L
1 & L2.
•
Use V-O-M to verify that there is no power at termi-
nals ‘FW(NO)’, ‘LO LlTE(NC)’ & ‘HTR(NO)’. If there
is power at any of these terminals, you will need to
find the source and turn it off.
Remove Wires from Probe and Relay Switch Termi-
nals:
•
DO NOT remove wires from L 1 & L2 terminals.
•
Tag wires and remove from probe and relay contact
terminals including ‘GND’ terminal.
•
Tag and remove wires from ‘RESET’ terminals.
•
Connect jumper wire to both ’RESET’ terminals.
Turn Power On to Terminals L 1 & L2:
•
‘LED l’ should turn on.
•
‘LED 2’ should be off.
•
‘LED 3’ should be off.
•
Use V-O-M to verify that there is power at ‘FW(NO)’
& ‘LO LlTE(NC)’ terminals and no power ‘HTR(NO)’
terminals Test Feedwater Function:
•
Connect jumper wire to ‘FW HIGH and ‘GND’ termi-
nals.
•
‘LED l’ should turn off after a 10 second delay.
•
Use V-O-M to verify that there is no power at the
‘FW (NO)’ terminal.
•
Remove jumper from ‘FW HIGH’ and ‘GND’ termi-
nals. . ‘LED l’ should turn on.
•
Use V-O-M to verify that there is power at the
‘FW(NO)’ terminal.
LED 1
LED 2
LED 3
RESET LW2 GND
LW1
FW - HIGH
HTA NO
LO LITE (NC)
FW (NO)
L1
L2
