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Close both compressor service valves if applicable (on 38AKS008,009,012) when crankcase heater is deenergized for more than 6 hours. 12 TROUBLESHOOTING GUIDE SYMPTOM CAUSE REMEDY Compressor does not run — Contactor open Power off. Restore power. Fuses blown. Replace with correct fuses after finding cause and correcting. Transformer open/shorted. Replace transformer if primary windings are receiving power and no output. Thermostat circuit open. Check thermostat setting. Low-pressure switch open. Check for refrigerant undercharge or system leak. High-pressure switch open. Check for refrigerant over charge or obstruction of outdoor airflow. Connections loose. Tighten all connections. Compressor motor thermostat open. Check for excessive motor temperature. Compressor does not run — Contactor closed Compressor leads loose, broken. Check connections with power off. Single phasing. Replace blown fuse. Compressor internal overload open. Allow compressor motor windings to cool down to reset overload. Determine cause for overload opening. Compressor cycles on high- pressure switch — Condenser fan on High-pressure switch faulty. Replace switch. Airflow restricted. Dirty coil. Remove obstruction, clean condenser coil. Air recirculating. Clear airflow area. Noncondensables in system. Recover, evacuate and recharge as required. Refer to Carrier GTAC-II, Module 5, Charging, Recovery, Recycling, and Reclamation. Refrigerant overcharge. Recover as required. Refrigerant system restrictions. Check or replace filter drier, expansion valve, etc. Compressor cycles on high- pressure switch — Condenser fan off Fan slips on shaft. Tighten fan hub screws. Motor not running. Check power and capacitor 1.3 and 3.4 hp motor. Motor bearings seized. Replace motor. Motor overload open. Check overload rating. Check for fan blade obstruction. Motor burned out, windings open. Replace motor. Compressor cycles on low- pressure switch — Evaporator fan running Filter drier plugged. Replace filter drier. Expansion valve power head defective. Replace power head. Low refrigerant charge. Find leak, repair, evacuate system, and recharge. Expansion valve restricted/plugged. Remove and replace expansion valve. Airflow restricted — Low suction pressure Evaporator coil iced up. Check refrigerant charge. Evaporator coil dirty. Clean coil fins. Indoor-air filter dirty. Clean or replace filters. Indoor-air dampers closed. Check damper operation and position. Indoor (evaporator) fan stopped — Low suction pressure Electrical connections loose. Tighten all connections. Fan relay defective. Replace relay. Motor overload open. Check power supply. Motor defective. Replace motor. Fan belt broken or slipping. Replace or tighten belt. Compressor runs but cooling insufficient — Suction pressure low Refrigerant charge low. Add charge. Head pressure low. Check refrigerant charge. Indoor-air filters dirty. Clean or replace filters. Expansion valve power head defective. Replace power head. Expansion valve restricted/plugged. Remove and replace expansion valve. Evaporator coil partially iced. Check low-pressure setting. Evaporator airflow restricted. Remove obstruction. Compressor runs but cooling insufficient — Suction pressure high Heat load excessive. Check for open doors or windows. NOTE: See Fig. 15 and 16 for component arrangements. 13 LEGEND AND NOTES FOR FIG. 15 AND 16 C CAP CB CH CLO COMP COTP EQUIP GND HPS LPS NEC — — — — — — — — — — — — Contactor, Compressor Capacitor Circuit Breaker Crankcase Heater Compressor Lockout Compressor Motor Compressor Temperature Protection Equipment Ground High-Pressure Switch Low-Pressure Switch National Electrical Code QT TB TDR TH TRAN — — — — — Quadruple Terminal Terminal Block Time-Delay Relay Thermostat-Heating Transformer Terminal (Marked) Terminal (Unmarked) Terminal Block Factory Wiring OFC OFM OL — — — Outdoor (Condenser) Fan Contactor Outdoor (Condenser) Fan Motor Overload Relay Field Power Wiring Fig. 15 — Typical 38AK Component Arrangement Fig. 16 — Typical 38AKS Component Arrangement Copyright 1999 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 4 PC 111 Catalog No. 533-876 Printed in U.S.A. Form 38A-7SI Pg 14 5-99 Replaces: 38A-6SI Tab 3a 2a CUT ALONG DOTTED LINE START-UP CHECKLIST A. Preliminary Information OUTDOOR: MODEL NO. SERIAL NO. INDOOR: AIR HANDLER MANUFACTURER MODEL NO. SERIAL NO. ADDITIONAL ACCESSORIES B. Pre-Start-Up OUTDOOR UNIT IS THERE ANY SHIPPING DAMAGE? (Y/N) IF SO, WHERE: WILL THIS DAMAGE PREVENT UNIT START-UP? (Y/N) CHECK POWER SUPPLY. DOES IT AGREE WITH UNIT? (Y/N) HAS THE GROUND WIRE BEEN CONNECTED? (Y/N) HAS THE CIRCUIT PROTECTION BEEN SIZED AND INSTALLED PROPERLY? (Y/N) ARE THE POWER WIRES TO THE UNIT SIZED AND INSTALLED PROPERLY? (Y/N) HAVE COMPRESSOR HOLDDOWN BOLTS BEEN LOOSENED (Snubber washers are snug, but not tight)? (Y/N) CONTROLS ARE THERMOSTAT AND INDOOR-FAN CON...

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