C3 Check Heater 2 Circuit

1. Determine in which test this alarm occurred a. Review active alarm list. Make a note of all alarms. b. Clear active alarm list. c. Restart and monitor Pretrip. Stop Pretrip during Test #3 by holding = Key for six seconds. d. Review active alarm list for Alarm 188. If alarm is present, follow steps 2 through 4 If alarm is not present, follow steps 5 through 10. 12 VDC CIRCUIT: 2. Check 3HTCON2 a. Inspect heater contactor coil and wire connections. Verify no damage to coil. Verify no damage, moisture, or corrosion in connections. b. Check contactor coil resistance. Refer to Section 2.12. 3. Check 3HTCON2 Amp Draw - Check 3HTCON2 amp draw. Use Component Test mode (Section 5.2.4) to test. Refer to Section 2.12 for correct amp values. View current draw in Component Test mode screen. 4. Check 3HTCON2 Wiring - Inspect harness and control box connector pins and terminals. (See wiring schematic Section 8.) Verify no physical damage to harness. Verify no damage, moisture, or corrosion in connectors. 5. Check Evaporator High Temperature Switch (EVHTS) - Inspect for open EVHTS per wiring schematic Section 8. If open, replace switch as required. Alarm continued on next page... P00167 C3 Check Heater 2 Circuit (continued) 460 VAC CIRCUIT: 6. Check Amp Draw of 3HTCON2 Heater Circuit a. With the unit running and calling for pull up in, use a clamp on ammeter to check the current draw of all three legs. Must be within range shown in Section 2.11 for all three legs. b. Verify correct fuse, check fuse holder for damage, see Figure 2.6. Replace fuse as required. Clear alarms, restart and check for repeat alarm(s). c. Check voltage at 3HTCON2 contacts. Must be within range shown in Section 2.11 for L1-L2, L1- L3, and L2-L3. Must be within range shown in Section 2.11 for T1-T2, T1-T3, and T2-T3. d. Shut down Unit. Verify SP-A, B, C by checking continuity from HTCON2 to GENCON 7. Check Heater Elements a. Check heater elements with the unit Off. Check for visual physical damage. Remove and replace if damaged. b. Check heater element resistance. Check from “T” terminals on 3HTCON2 contactor. See Section 2.11 for correct resistance. 8. Check Heater Element Connections a. Inspect high voltage heater connections at evaporator. Check for corrosion, water damage or burning / discoloration. Remove, repair, or replace if required. b. Disconnect heater element plug. Heater resistance per Section 2.11. Remove and replace heaters if required. c. Inspect plugs, plug seal and connectors. Check for corrosion, water damage or burning / discoloration. Remove and replace if required. 9. Verify Accuracy of AC Current Sensor a. Put microprocessor in PC mode. Refer to Section 5.3.2. Must have 0 AC1 Amps and 0 AC2 Amps in Unit Data. b. Use a clamp on ammeter to measure current draw of all three legs of the T side of GENCON. Meter reading should be the same as Unit Data. Compare meter reading to Unit Data in PC mode. Compare meter reading to Unit Data with unit under load.