Check SV2 Circuit
electrical
Description
SV2 coil circuit is shorted when energized or open at other times; the unit gives alarm only.
Activation Conditions
A problem has been detected in the SV2 coil circuit. If this alarm is activated while the control system is calling for SV2 to be energized, the circuit is detected shorted. If this alarm is activated at any other time, the circuit is detected open.
Unit Behavior
Alarm only.
Reset Conditions
Auto reset when unit calls for cooling and the SV2 coil circuit is normal, or Alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
Corrective Actions
1. Check Coil a. Inspect coil and connector pins and terminals. Verify no damage to coil. Verify no damaged or corroded pins. b. Check resistance of coil. Refer to Section 1.11 for specifications. c. Use Component Test mode (Refer to Section 1.2.4) to test actual current draw of the circuit. Refer to Section 1.11 for specifications. Verify that the actual current is within specifications. 2. Check Power and Wiring a. Use Component Test mode (Refer to Section 1.2.4) to energize circuit. Check for power at SV2 terminal A and 3MM-2. Minimum 11 VDC. If not, check connectors and wiring between terminals. Verify no damage, moisture or corrosion. b. Check for ground at SV2 terminal B (including SP-3) to GND RING1. Good ground. If not, check connectors and wiring between terminals. Verify no damage, moisture or corrosion.