20
WATER CONTROL BOARD TESTING PROCEDURE
This test procedure is to be used
to determine if the control is work
-
ing properly. It is not intended to de
-
termine why the control may have
failed.
If testing shows that the control is
operating properly, check all probe
and solenoid wiring and the condi
-
tion of the electrodes in the steam
chamber.
Contact the factory if the boiler still
does not operate properly after com
-
pleting 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 terminals ‘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 Re-
lay Switch Terminals:
DO NOT remove wires from L 1 &
L2 terminals.
Tag wires and remove from probe
and relay contact terminals includ-
ing ‘GND’ terminal.
Tag and remove wires from ‘RE
-
SET’ terminals.
Connect jumper wire to both ’RE
-
SET’ 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’
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and ‘GND’ terminals.
‘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’ terminals. . ‘LED l’ should
turn on.
Use V-O-M to verify that there is
power at the ‘FW(NO)’ terminal.
Test Primary Low Water Function:
Connect jumper wire to ‘LW(1) and
‘GND’ terminals.
‘LED 3’ should turn on.
Remove jumper wire from ‘LW(1)’
and ‘GND’ terminals.
‘LED 3’ should turn off after a 3 sec
-
ond delay.
Connect jumper wire to ‘LW(1)’ and
‘GND’ terminals.
‘LED 3’ should turn on.
IMPORTANT:
Jumper wire between ‘LW(1)
and ‘GND’ terminals must re
-
main in place to test secondary
low water function.
Test Secondary Low Water
Fun tion:
Connect jumper wire to ‘LW(2)’ and
‘GND’ terminals.
‘LED 2’ should remain off.
Use V-O-M to verify that there is
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power at the ‘LO LlTE(NC)’terminal
and no power at the ‘HTR(NO)’ ter
-
minal.
Remove the jumper wires from the
‘RESET’ terminals.
‘LED 2’ should turn on.
Use V-O-M to verify that there is
no power at the ‘LO LlTE(NC)’ ter
-
minal and power at the ‘HTR(NO)’
terminal.
Connect jumper wire to ‘RESET’
terminals.
Remove jumper wire from ‘LW(2)’
and ‘GND’ terminals.
‘LED 2’ should turn off after a 3 sec
-
ond delay.
USE V-O-M to verify that there is
power at the ‘LO LlTE(NC)’ termi
-
nal and no power at the ‘HTR(NO)’
terminal.
Connect jumper wire from ‘LW(2)’
and ‘GND’ terminals.
‘LED 2’ should remain off.
IF ANY OF THE FUNC-
TIONS DONOT WORK,
REPLACE THE BOARD!
IF ALL FUNCTIONS
WORK, TROUBLE
SHOOTING OTHER
COMPONENTS WILL
BEREQUIRED!
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GENERAL TOUBLE SHOOTING GUIDE
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Содержание M24E24A
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