C2 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 187. If alarm is present, follow step 2. If alarm is not present, follow steps 3 through 7. 12 VDC CIRCUIT: 2. Check 2HTCON2 Refer to Alarm 00104 Check 2HTCON2 Coil. 3. Check Evaporator High Temperature Switch(es) (HTA/HTB) Refer to Section 2.5 and Alarm 05022 C2 Check High Temperature Thermostat. Alarm continued on next page... P00147 C2 Check Heater 2 Circuit (continued) 460 VAC CIRCUIT: 4. Check Amp Draw of 2HTCON2 Heater Circuit a. With the unit running and calling for Heat, 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 2HTCON2 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 2HTCON2 to GENCON. 5. Check Heater Elements a. Check heater elements with the unit Off. Verify no visual physical damage. Remove and replace if damaged. b. Check heater element resistance. Check from “T” terminals on 2HTCON2 contactor. See Section 2.11 for correct resistance. 6. 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. 7. 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.