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General| Model | 38HD018 |
|---|---|
| Cooling Capacity | 18, 000 BTU/h |
| Refrigerant | R-410A |
| Phase | 1 |
| Voltage | 208-230V |
Observe literature, tags, labels, codes. Wear safety gear, have fire extinguisher. Read instructions thoroughly.
Turn off main power before installation/servicing. Turn off accessory heater power if applicable. Electrical shock can cause personal injury.
Unpack unit, inspect shipment, and consider system requirements. Ensure adequate space for airflow, wiring, and piping.
Verify the correct Accurater (bypass type) refrigerant control for cooling system capacity optimization.
Mount on a solid, level concrete pad or a level platform/frame. Consider roof mounting as an option.
Ensure unit panels are secure. Use appropriate slings and spreader bars to prevent damage during lifting.
The filter drier is factory supplied. A moisture indicator (sight glass) is a field-supplied option.
A fusible plug is in the suction line. Do not cap it. Install additional safety devices as required by local code.
Unit is factory wired for nameplate voltage. Provide adequate fused disconnect switch. Use minimum 60°C wire for field power connection.
Control voltage is 24 volts (40 va minimum). Route control wires through unit side panel to the control box.
To avoid personal injury, ensure indoor blower has stopped before attempting service or maintenance.
Verify internal wiring, power source, and open service valves. Ensure crankcase heater is tight.
Field piping must be leak tested and evacuated to 1000 microns to eliminate contamination and moisture.
Energize crankcase heater by setting thermostat above ambient to prevent refrigerant migration and oil dilution.
Backseat service valves to close the service port. Failure can result in system charge loss or personal injury.
Release holding charge by opening service valves. Add charge as required. Refer to Table 1 for indoor sections.
After crankcase heater runs 24 hrs, set thermostat below ambient. Unit starts after a 5-minute delay.
Turn off main power before maintenance. Failure can cause shock or injury from rotating fan blade.
Check fan mounting, relief valve, overload. Use pumpdown for low-side repairs. Replace filter drier when moisture is indicated.
Use Tables 4 and 5 to check and adjust charge during cooling season. Operate unit 15 minutes before checking.
Install Time Guard II device in the 24-v control circuit to protect the compressor from short cycling.
Turn off unit power before maintenance. Failure can cause shock or injury from rotating fan blade.
Compressor has factory oil. Replace oil when lost. Refer to Service Techniques Manual for recharging procedure.
Lubricate fan motor bearings annually or every 3-5 years based on environment and operating time. Use SAE-10 oil.
Clean coils annually or as required using water or compressed air. Flush dirt and debris from drain holes.
This chart helps diagnose and resolve cooling cycle issues such as no cooling, insufficient cooling, high suction, low head pressure, etc.
