Major Electrical Systems Test; Transformer Test; Control Test; Water Solenoid Test - mr. steam MS-65 Installation, Operation & Maintenance Manual

MAJOR ELECTRICAL SYSTEMS TEST
Transformer Test
1. Power to unit is on.
2. Check voltage at terminals 1 & 4 of the Control Terminal Block = 24VAC.
3. If voltage is OVAC, replace transformer. If voltage is less than 24VAC, check incoming power.
Control Test
1. Power to unit is on.
2. Transformer test is good.
3. Turn control on.
4. Check voltage at terminals 2 & 4 of the Control Terminal Block = 24VAC.
5. If voltage is OVAC, check control wiring and connections for proper fit and installation.
Water Solenoid Test
1. Power to unit is on.
2. Control test is good.
3. Drain water fron unit by opening manual drain valve (not necessary if unit has a functioning
autoflush valve).
4. Turn control on.
5. Check voltage at LI and L2 contacts on the Liquid Level Control printed circuit board = 24VAC.
6. Check voltage at "PUMP" & L2 contacts on the Liquid Level Control printed circuit board =
24VAC. If voltage = OVAC, then proceed to probe test.
7. Check voltage at the gray and white wires at water solenoid = 24VAC.
8. If voltage is 24VAC, and water does not enter, replace water solenoid valve.
Probe Test
•
1. Turn power off.
2. Drain water from unit by opening manual drain valve (not necessary if unit has a functioning
autoflush valve.)
3. Disconnect purple wire and green/yellow wire from the Liquid Level Control Board labeled "Probe"
and "GND".
4. Check resistance between the purple wire and green/yellow wire.
5. With water level low, probe resistance should be open, if not, replace probe.
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