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18 AWG cannot be directly connected to the thermostat and will require a junction box and splice at the thermostat. 1. Connect thermostat wires to screw terminals of low- voltage connection board. 2. Pass the control wires through the hole provided in the corner post. (See Fig. 7.) 3. Feed wire through the raceway built into the corner post and into the 24 v thermostat connection board. The 24 v thermostat connection is located on the left side of the low-voltage connection compartment. The raceway provides the UL required clearance between high-and low- voltage wiring. LEGEND AHA — Adjustable Heat Anticipator TDR — Time-Delay Relay C— Contactor, Compressor TH — Thermostat-HeatingCB — Circuit Breaker TRAN — Transformer 24-V BARRIER LOW-VOLTAGE THERMOSTAT CONNECTION BOARD RACEWAY CORNER POST Fig.7—FieldControlWiringRaceway(38AKSUnitShown) Total combined amperage drain of the field-installed liquid line solenoid valve and indoor (evaporator) fan contactor must not exceed 22 va. If the specified va must be exceeded, use a remote relay to switch the load. CC—CoolingCompensatorCLO—CompressorLockoutHPS—High-PressureSwitchIFC—Indoor(Evaporator)FanContactorLLSV—LiquidLineSolenoidValveLPS—Low-PressureSwitchTB—TerminalBlockTC—Thermostat-CoolingTerminal(Marked) SpliceFactoryWiringFieldControlWiringToIndicateCommonPotentialOnly;NottoRepresentWiring Fig.6—TypicalControlWiringConnections(38AKShown) 8 START-UP Preliminary Checks 1. Field electrical power source must agree with unit nameplate rating. 2. Check that all internal wiring connections are tight and that all barriers, covers, and panels are in place. 3. Ensure all service valves are open. On 38AKS units, be sure all compressor service valves are backseated. 4. Verify that compressor holddown bolts for units 38AKS have been loosened and that flat/snubber washers can be rotated by applying finger pressure (snug, but not tight). 5. Verify compressor crankcase heater is securely in place. Crankcase heater must operate for at least 24 hours before start-up. The 38AK unit size 007 does not require a crankcase heater. 6. Note that compressor oil level is visible in the sight glass (38AKS units only). 7. Check for leaks in refrigerant system by using soap bubbles and/or electronic leak detector. 8. Check that liquid line solenoid valve is located at evaporator coil as shown in Filter Drier and Moisture Indicator section, page 6. 9. Check voltage imbalance as shown in Table 5, Note 2. 10. Check that both outdoor and indoor units are properly mounted in accordance with installation instructions and applicable codes. Evacuate and Dehydrate — Evacuate and dehydrate entire refrigerant system by use of the methods described in Carrier GTAC II, Module 4, System Dehydration. Evacuate system down to 500 microns and ensure vacuum hold for 15 minutes. If vacuum does not hold, pressurize system and locate leak and repair. Refrigerant Charge — Refer to Carrier GTAC II, Module 5, Charging Recovery, Recycling, and Reclamation. NOTE: Use of a Carrier Totalclaim. refrigeration recovery unit is highly recommended when recovering refrigerant. Unit panels must be in place when unit is operating during charging procedure. Unit is shipped with holding charge only. Weigh in 7 lb (3 kg) of R-22 to start unit. CHARGE COOLING — Use Cooling Charging Charts, Fig. 8A or 8B and 9A or 9B. Vary refrigerant until the conditions of the chart are met. Note that charging charts are different from type normally used. Charts are based on charging the units to the correct subcooling for the various operating conditions. Accurate pressure gage and temperature sensing device are required. Connect the pressure gage to the service port on the liquid line service valve. Mount the temperature sensing device on the liquid line, close to the liquid line service valve and insulate it so that outdoor ambient temperature does not affect the reading. Indoor airflow must be within the normal operating range of the unit. Operate unit a minimum of 15 minutes. Ensure pressure and temperature readings have stabilized. Plot liquid pressure and temperature on chart and add or reduce charge to meet curve. Adjust charge to conform with charging chart, using liquid pressure and temperature to read chart. Compressor Overload — This overload interrupts power to the compressor when either the current or internal motor winding temperature becomes excessive, and automatically resets when the internal temperature drops to a safe level. This overload may require up to 60 minutes (or longer) to reset. If the internal overload is suspected of being open, disconnect the electrical power to the unit and check the circuit through the overload with an ohmmeter or continuity tester. Cycle-LOC™ Device — When high-pressure or low- pressure fault occurs, the Cycle-LOC device will protect the system by not allowing the compressor to start. Low-Pressure/Loss-of-Charge Switch (LPS) — When the liquid line pressure drops below 7 psig (48 kPa), the LPS ...

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