Carrier 38HDR Installation Instructions Manual

Also see for 38HDR: Owner's information manual Installation instructions Product data

Contents

9LEGENDNOTES:1. Compressor and fan motors are thermally protected.2. Wire in accordance with National Electrical Code (NEC) and local codes. Replaceany original wires with 90° C wire or its equivalent.3. The CLO locks out the COMP to prevent short cycling on COMP overloads andsafety devices. Before replacing CLO check these devices.4. If indoor section has a transformer with a grounded secondary, connect thegrounded side to “C” on the low voltage board.5. Use minimum 60° C wire for field power wiring.6. Crankcase heater and thermostat used on selected models only.C — Contactor, CompressorCAP — CapacitorCCHT — Crankcase Heater ThermostatCH — Crankcase HeaterCOMP — Compressor MotorEQUIP — EquipmentGND — GroundHPS — High-Pressure SwitchLPS — Low-Pressure SwitchOFM — Outdoor-Fan MotorOL — OverloadTB — Terminal BoardSplice (Field)Terminal (Marked)Terminal (Unmarked)Terminal BlockSpliceFactory WiringField Control WiringField Power Wiring38HDR OPERATION SEQUENCECALL FOR COOLING:1. Control voltage from transformer to thermostat (24 v).2. At thermostat 24 v is switched to “G” and “Y.”3. 24 v from thermostat “G” energizes fan relay at indoor fan coil and indoor-fan motor runs.4. 24 v from thermostat “Y” energizes the contactor coil at the outdoor unit.Compressor and outdoor-fan motor run.6. If the internal protector of the compressor, HPS, or LPS open, the 24 v to the contactor coil will be inter-rupted, and compressor and outdoor fan motor will stop.A07535Fig. 6 --- 38HDR018--060 Typical Wiring Schematic38HDR