Electronic Expansion Valve
RTHC-SVD01B-EN 49
8-3 b. Motor Voltage Checkout Procedures
If the resistance values are correct and the stepper module is being
powered correctly, the motor voltages need to be measured while the
valve is stroking.
1. In the Service Test menu, change “Expansion Valve Test:” to
“Enabled”. With the test enabled, wait for the timing test to begin
before recording voltages.
2. Use Table 8-3 to check voltages.
3. If the voltages do not fall within the acceptable range, the 1U3
stepper module needs to be replaced.
Table 8-3: EXV Motor Voltages
Connector Pin Voltage (VAC) Voltage (VDC)
J8-4 to J8-3 16.7 to 23.3 -250mV to 250 mV
J8-4 to J8-2 18.2 to 24.0 -30 mV to 30 mV
J8-4 to J8-1 16.7 to 23.3 -250 mV to 250 mV
J8-3 to J8-2 16.7 to 23.3 -250 mV to 250 mV
J8-3 to J8-1 18.2 to 24 -30 mV to 30 mV
J8-2 to J8-1 16.7 to 23.3 -250 mV to 250 mV
J8-4 to ground 11.1 to 15.7 6.6 to 7.0
J8-3 to ground 11.1 to 15.7 6.6 to 7.0
J8-2 to ground 11.1 to 15.7 6.6 to 7.0
J8-1 to ground 11.1 to 15.7 6.6 to 7.0
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