Drain Valve & Return Valve Switches; Transformer; Blower; Pressure Switch - Pitco frialator MG14S-C/MFD Serviceanleitung

defective.
Drain Valve & Return Valve Switches:
This switch is a magnetically operated Reed switch. When
the Drain Valve handle is moved to the open position,
the Actuator will move away from the switch causing
the Reed switch to open. When the Drain Valve is closed
the Reed switch will close. This switch can also be
checked with an Ohm meter. The normal gap between
the Actuator and the Sensor switch on the Drain Valve
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handle is / " - / " (3 - 6 mm).
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Transformer:

Transformers are multiple input voltage, 24 volt output
voltage and can be checked by reading the input and
output voltages.

Blower:

Check the voltage between the wires going to the Blower.
If voltage is found and the Blower is NOT turning it is
defective.

Pressure Switch:

As the blower speed rises the amount of vacuum on the
suction side of the pressure switch rises past approxi-
mately 1.3" WC (0.325 kPa) the Presssure Switch will
close. When the vacuum falls below approximately 0.8"
WC (0.2 kPa) the Pressure Switch will open. With the
Blower running, check the IN and OUT voltage of the
Switch. If 24VAC can be found on one side but NOT
the other the Pressure Switch is defective.

Gas Valve:

The Knob should be in the ON position. Check for
24VAC between the terminals marked MV and MV/
PV and between PV and MV/PV. If voltage IS found
between both of these connections and the Gas Valve
does not open the Gas Valve is defective. If voltage is
NOT present at both of the coils on the Gas Valve,
troubleshoot and repair the machine until voltage IS
present at both coils, retest the Gas Valve as previously
described.
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