Section 6 – SR-2 Service Procedure G03A
Electronic Throttling Valve (ETV) Test
Where Used
All SR-2 units equipped with ETV
Purpose
To confirm proper operation of the Electronic Throttling Valve
Table of Contents
Materials Required
•
Test ETV to confirm operation if required.
•
If the ETV must be changed consult the Maintenance Manual for the specific unit.
Operation
This procedure should be used to check the operation of the electronic throttling valve if Alarm Code 89 occurs.
Alarm Code 89 indicates that refrigeration system pressures did not respond as expected. This may be caused
by a malfunction in the electronic throttling valve circuits or a refrigeration system problem such as low refrigerant
level, frozen expansion valve or severe suction side restriction.
The Electronic Throttling Valve has two internal coils. The microprocessor operates the valve is by energizing the
coils with a variable frequency ac signal. The sequence in which the microprocessor energizes the coils
determines the direction of travel and the frequency of the signal determines the speed of valve motion. Wires
EVA and EVB energize one coil and wires EVC and EVD energize the other coil. The ETV circuits are protected
by Smart FETs. Valve position may be monitored by using the Gauge key. 0 indicates the valve is fully closed
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