Check 1EVCON Coil
engine
Description
Evaporator fan motor contactor 1EVCON circuit is shorted or open, and the unit gives an alarm only.
Activation Conditions
Evaporator fan motor contactor (1EVCON) circuit is shorted or open.
Unit Behavior
Engine and Electric Operation: Alarm only.
Reset Conditions
Auto Reset or alarm may be manually reset via keypad or by turning the unit off, then back on again.
Corrective Actions
1. Check 1EVCON a. Inspect contactor coil and terminals. Verify there is no damage to coil, and no damage or corrosion to terminals. b. Check contactor coil resistance. Refer toSection 2.12 for contactor coil resistance values. Cannot be opened (infinite ohms), shorted (Zero Ohms) or shorted to ground. 2. Check 1EVCON Using Component Test mode a. Use Component Test mode to energize 1EVCON. (Refer to Section 5.2.4.) Verify Current Draw on Component Test mode Screen. Refer to Section 2.12 for correct electrical values. b. Check coil voltage between A1 and A2. Verify 12 VDC between A1 and A2. c. Check resistance at contacts. Verify contacts are closed at L1-T1, L2-T2, L3-T3. 3. Check 1EVCON Wiring - Inspect harness and control box connector pins and terminals. (See wiring schematic Section 10.3) Verify there is no physical damage to harness. Verify there is no damage, moisture, or corrosion in connectors.