Carrier 38E- Manuals

CAPACITORS — (See Fig. 5.) A CAUTION Capacitors can store electrical energy when power is off. Electrical shock can result if you touch the capacitor terminals and discharge this stored energy. Exercise extreme caution when working near capacitors. With power off, discharge stored energy by shorting...

220-V FROM UNIT Fig. 7 — Capacitance Boosting Turn off power. Check compressor for ground or open. If there is none, proceed. Obtain a start capacitor approved by compressor manufacturer. Connect wires with insulated probes to each terminal. Touch probes to each side of run capacitor. Energize and s...

Tl Т2 3 SEC OPERATING TIME 5MIN- BLK DENOTES CLOSED CONTACTS TIME GUARD II SEQUENCE CHART ACCESSORY TIME GUARD II DEVICE CUT YELLOW WIRE -CONTROL BOX MOUNTING ACCESSORY TIME GUARD II ON MODEL 38QH,QS,QN NOTE: When accessory Time Guard II is used with accessory Service Sentry control on 38QH,QN,QS un...

every 30, 50 or 90 minutes of operating time. Control board has additional feature that allows unit to restart in defrost cycle if room thermostat is satisfied during defrost. Troubleshooting defrost control involves a series of simple steps that indicate whether board is defective. NOTE: Procedure ...

Reading on voltmeter should indicate zero volts. This step ensures defrost relay contacts have closed, energizing supplemental heat and reversing valve solenoid. 10. Unit should remain in defrost no longer than 10 minutes. Actual time in defrost depends on how quickly speed-up jumper is removed. If ...

capacitor. Fan motor is equipped with thermal overload device in motor windings which may open under adverse operating conditions. Allow time for motor to cool so device can reset. Further checking of motor can be done with an ohmmeter. Set scale on R x 1 position, check for continuity between 3 lea...

24-VOLT WIRING * c LINE VOLTAGE SUPPLY WIRE P PASS SUPPLY WIRE THRU METALLIC LOOP TWICE ON UNITS WITH NAMEPLATE RLA OF 14 AMPS OR LESS 07 FIELD LINE VOLTAGE SUPPLY WIRE >TB THERMOSTAT SUBBASE INDOOR UNIT TERMINAL BOARD OUTDOOR UNIT TERMINAL BOARD C — Contactor LLPS — Liquid Line Low-Pressure Swit...

NOTES: 1. Affix capillary and bulb on outside of grille wire nearest control box. 2. Secure bulb to grille with wire ties or suitable fastener. 3. If necessary, shield bulb from direct sunlight using appropriate material. Fig. 16 — Outdoor Thermostat Installation A CAUTION Exercise extreme caution w...

J OHM METER 0-10 ÍÍ SCALE Ф 5.2 Í1 é 0.6 Í! (Ь 5.8 Í1 (example) TO DETERMINE INTERNAL CONNECTIONS OF SINGLE­ PHASE MOTORS (C,S,R) except shaded-pole Deduction: ©—(D (greatest resistance) 5.8il (ohm) @@ (smallest resistance) 0.611 (3 )—@ (remaining resistance) 5.211 Run Winding (R)Start Winding (S) (...

resistance from each reading. If any reading is within ± 20% of known resistance, motor is probably normal. Usually a considerable difference in reading is noted if a turn-to-turn short is present. SYSTEM CLEAN-UP AFTER BURN-OUT A CAUTION Turn off all power to unit before proceeding. Wear safety gla...

Fig. 20 — Leak Detector If a system has lost all or most of its charge, system must be pressurized again, up to approximately 1501b minimum. This can be done by adding refrigerant, using normal charging procedures. Or, it may be pressurized with nitrogen (less expensive than refrigerant). Nitrogen a...

This type of fitting is easily repaired if leaks develop. Frontseat outdoor section service valves after relieving refrigerant pressure in system. Back locknut off Carrier Compatible Fitting onto tube. Cut fitting between threads and 0-ring. Remove tubing section remaining in threaded portion of fit...

TO OUTDOOR COIL TP-4 FROM INDOOR COIL VIA SERVICE VALVE ON OUTDOOR COIL TO ACCUMULATOR TP-3 TP-2 J TP-1 FROM COMPRESSOR DISCHARGE LINE TP = Test Point TP-2 and TP-3 Cool or cold, may have condensation or frost on both lines entering valve body, 5F to 10F maximum temperature difference across normall...

5. Remove 2 (015,018) or 4 (024,060) screws at base of coil (located at end of large vertical wires in coil support). 6. Lift coil vertically from basepan, place aside carefully. NOTE: When coil is removed, use opportunity to also remove liquid line strainer. Strainer location is identified by label...

HEATING a COOLING 38E,Q Condensing Units and Heat Pumps New drier takes over function of strainer. If refrigera­ tion system in outdoor unit is opened for any reason, remove strainer and install a filter drier in liquid line between indoor and outdoor sections. ACCUMULATOR — Accumulator is a device ...