AUGUST 29, 2014
7
M24G & M36G GAS BOILERS
WATER CONTROL BOARD TESTING PROCEDURE
Test Primary Low Water Function:
•
Connect jumper wire to ‘LW(1) and‘GND’ terminals.
•
‘LED 2’ should turn on.
•
Remove jumper wire from ‘LW(1)’ and ‘GND’ termi-
nals.
•
‘LED 2’ should turn off after a 3 second delay.
•
Connect jumper wire to ‘LW(1)’ and ‘GND’ terminals.
•
‘LED 2’ should turn on.
•
Use V-O-M to verify that there is power at the ‘LO
LlTE(NC)’terminal and no power at the ‘HTR(NO)’
terminal.
•
Remove the jumper wires from the ‘RESET’ termi-
nals.
•
‘LED 3’ should turn on.
•
Use V-O-M to verify that there is no power at the
‘LO LlTE(NC)’ terminal and power at the ‘HTR(NO)’
terminal.
•
Connect jumper wire to ‘RESET’ terminals.
•
Remove jumper wire from ‘LW(2)’ and ‘GND’ termi-
nals.
•
‘LED 3’ should turn off after a 3 second delay.
•
USE V-O-M to verify that there is power at the ‘LO
LlTE(NC)’ terminal and no power at the ‘HTR(NO)’
terminal.
•
Connect jumper wire from ‘LW(2)’ and ‘GND’ termi-
nals.
•
‘LED 3’ should remain off.
IMPORTANT
Jumper wire between ‘LW(1) and ‘GND’
terminals must remain in place to test sec-
ondary low water function. IF ANY OF THE
FUNCTIONS DO NOT WORK, REPLACE THE
BOARD!
Test Secondary Low Water Function:
•
Connect jumper wire to ‘LW(2)’ and ‘GND’ terminals.
•
‘LED 3’ should remain off.
IF ALL FUNCTIONS WORK, TROUBLE-SHOOTING
OTHER COMPONENTS WILL BE REQUIRED!
