30
Troubleshooting the Electric Expansion Valve
If the valve stops moving, depending upon how far open it is, one or more alarms may be displayed. These
alarms include a low superheat alarm, a low temperature alarm, and/or a high temperature alarm.
Use the following steps to troubleshoot the valve:
1) Disconnect the valve from the controller.
2) The resistance between the black and white leads should be 90 ohms. The resistance
between the black and red leads should be an open.
3) The resistance between the red and green leads should be 90 ohms. The resistance
between the white and green leads should be an open.
4) The resistance between each lead and the brass housing of the valve should be an open.
5) Read the AC, not DC, voltage across the black and white leads while the valve is moving.
The AC voltage should be 11 to 13 VAC. The voltage will be close to 0 VAC when the valve is
not moving.
6) Repeat step 5 across the red and green leads.
If any voltage is out of tolerance, replace the controller. If the above steps pass, inspect for contamination in
the valve or nicks on the seat of the valve.
CAUTION: If the valve was taken apart and was left running while taken apart, the piston may have come too
far out of the motor assembly. If you reassemble the valve with the piston in this position, the threads in the
piston will be stripped when the piston is forced into the seat while tightening the lock nut. Make sure the piston
is drawn up far enough into the motor assembly before reassembling.
MASTER-BILT PART NUMBERS
Use the chart below when ordering replacement parts for your Master-Bilt Master Controller 2.0 refrigeration
system.
Item Description Part Number Notes
Master Controller 2.0 Board Med. Temp. Cooler 19-14285 Please re-set for applications
Master Controller 2.0 Board Low Temp. Freezer 19-14282 Please re-set for applications
Electric Expansion Valve 19-13772 Connections: SER-6-1/2”x1/2”
Electric Expansion Valve 19-13773 Connections: SER-6-5/8”x5/8”
Low Pressure Transducer 19-14223 Suction Pressure
4-Way Reversing Valve 09-09776 7/8” Connections, 24VAC Coil
4-Way Reversing Valve 09-09783 1 3/8” Connections, 24VAC Coil
Temperature Sensor 19-13967 30” Leads
Temperature Sensor 19-13968 10 ft Leads
24VAC Control RELAY 19-13986 For compressor control
24VAC, 40VA Transformer 39-01088 120/208/240 V Primary
Wireless Router 19-14294
Fast MB Master-Controller, Commercial
Range, 5 Port 10/100
19-14287
Fast Ethernet Switch, 8 Port 10/100 19-14288
Cable: 50 feet Ethernet Cat5e, 19-14290 With Ethernet Switch
Cable: 25 feet Ethernet Cat5e 19-14289 Use between AMCs
Cable: 100 feet Ethernet Cat5e 19-14291 With Ethernet Switch
Valve Test Kit 19-13786 Recommended for service
Fuse, BK/MDL-1/4, Time Delay, for AMC 19-14299 for AMC, Vendor: KE2Therm
For condensing unit installation and wiring, please consult the Master-Bilt Condensing Unit System Installation
and Operation Manual. If any discrepancy is found in this manual, please contact Master-Bilt Technical Service
Department immediately.
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