13ACX Series Air Conditioner

Performance Data

1 Temperature of air entering outside coil.

System Operation

⚠️ IMPORTANT Some scroll compressors have an internal vacuum protector that will unload scrolls when suction pressure goes below 20 psig. A hissing sound will be heard when the compressor is running unloaded. The protector will reset when low pressure in the system is raised above 40 psig. DO NOT REPLACE COMPRESSOR.

The outdoor unit and indoor blower will cycle on and off as dictated by demands from the room thermostat. When the thermostat's blower switch is in the ON position, the indoor blower will operate continuously.

High Pressure Switch (S4)

13ACX units are equipped with a high-pressure switch that is located in the liquid line of the compressor. The switch is a Single Pole, Single Throw (SPST), manual-reset switch which is normally closed and removes power from the compressor when discharge pressure rises above the factory setting at 590 ± 10 psi. The manual-reset button can be identified by a red cap that is pressed to perform the reset function.

[Figure 14. High Pressure Switch (S4) Manual Reset Button]

The manual reset button is a red cap that, when pressed, performs the reset function for the switch.

Maintenance

? WARNING Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to the unit OFF at the disconnect switch(es). The unit may have multiple power supplies.

? WARNING Improper installation, adjustment, alteration, service, or maintenance can cause personal injury, loss of life, or damage to property. Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency.

Maintenance and service must be performed by a qualified installer or service agency. At the beginning of each cooling season, the system should be checked as follows:

Outdoor Unit

• Outdoor unit fan motor is pre-lubricated and sealed. No further lubrication is needed.
• Visually inspect all connecting lines, joints, and coils for evidence of oil leaks.
• Check all wiring for loose connections.
• Check for correct voltage at the unit (unit operating).
• Check amp draw on the outdoor fan motor.

Motor Nameplate: ____________________ Actual: ____________________

Outdoor Coil

Clean and inspect the outdoor coil (may be flushed with a water hose). Ensure power is off before cleaning.

NOTE It may be necessary to flush the outdoor coil more frequently if it is exposed to substances which are corrosive or which block airflow across the coil (e.g., pet urine, cottonwood seeds, fertilizers, fluids that may contain high levels of corrosive chemicals such as salts).

Sea Coast: Moist air in ocean locations can carry salt, which is corrosive to most metal. Units located near the ocean require frequent inspections and maintenance. These inspections will determine the necessary need to wash the unit, including the outdoor coil. Consult your installing contractor for proper intervals/procedures for your geographic area or service contract.

Inspect drain holes in the coil compartment base and clean if necessary.

NOTE If insufficient cooling occurs, the unit should be gauged and refrigerant charge should be checked.

Indoor Unit

• Clean or change filters.
• Lennox blower motors are prelubricated and permanently sealed. No more lubrication is needed.
• Adjust blower speed for cooling. Measure the pressure drop over the coil to determine the correct blower CFM. Refer to the unit information service manual for pressure drop tables and procedure.
• Belt Drive Blowers - Check belt for wear and proper tension.
• Check all wiring for loose connections.
• Check for correct voltage at the unit (blower operating).
• Check amp draw on the blower motor.

Motor Nameplate: ____________________ Actual: ____________________

Indoor Coil

• Clean coil if necessary.
• Check connecting lines, joints, and coil for evidence of oil leaks.
• Check condensate line and clean if necessary.

Start-Up and Performance Checklist

Job Details:

• Job Name: ____________________
• Job Location: ____________________ (City: __________, State: __________)
• Installer: ____________________ (City: __________, State: __________)
• Service Technician: ____________________
• Job no.: ____________________
• Date: ____________________

Unit Information:

• Unit Model No.: ____________________
• Serial No.: ____________________
• Nameplate Voltage: ____________________
• Rated Load Ampacity: ____________________
• Maximum Fuse or Circuit Breaker: ____________________

Performance Checks:

• Electrical Connections Tight? [ ]
• Indoor Filter clean? [ ]
• Supply Voltage (Unit Off): ____________________
• Indoor Blower RPM: ____________________
• S.P. Drop Over Indoor (Dry): ____________________
• Outdoor Coil Entering Air Temp.: ____________________
• Discharge Pressure: ____________________
• Suction Pressure: ____________________
• Refrigerant Lines: Leak Checked? [ ] Properly Insulated? [ ]
• Refrigerant Charge Checked? [ ]
• Service Valves: Fully Opened? [ ] Caps Tight? [ ]
• Outdoor Fan Checked? [ ]
• Voltage With Compressor Operating: ____________________

Thermostat:

• Calibrated? [ ]
• Properly Set? [ ]
• Level? [ ]