Refrigerant Filter Driers
Table 6 - Max Filter Drier Pressure Drops
Adjusting Refrigerant Charge
CAUTION! COMPRESSOR LUBRICANT Polyolester (POE) and Polyvinylether (PVE) oils are two types of lubricants used in hydrofluorocarbon (HFC) refrigeration systems. Refer to the compressor label for the proper compressor lubricant type.
CAUTION! CLEAN AIR ACT The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFC’s and HCFC’s) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for non-co
Checking Liquid Sub-cooling
Table 7 - Acceptable Refrigeration Circuit Values
Checking Evaporator Superheat
CAUTION! EXPANSION VALVE ADJUSTMENT Thermal expansion valves must be adjusted to approximately 8-15°F of suction superheat. Failure to have sufficient superheat will damage the compressor and void the warranty.
Adjusting Sub-cooling and Superheat Temperatures
CAUTION! DO NOT OVERCHARGE! Refrigerant overcharging leads to excess refrigerant in the condenser coils resulting in elevated compressor discharge pressure.
Special Low Ambient Option Charging Instructions
For units equipped with low ambient control (LAC) refrigerant flood back option being charged when the ambient temperature is warm:
For units equipped with low ambient refrigerant flood back option being charged when the ambient temperature is cold:
Table 8 - R-410A Refrigerant Temperature-Pressure Chart
Condenser Tube Inspection
Fan Motor Maintenance
Cleaning -: Remove
Labeled Motors - It is imperative for repair of a motor with Underwriters’ Laboratories label that original clearances be held
Propeller Fans and Motors
Recommended Annual Inspection
E-Coated Coil Cleaning
WARNING! ELECTRIC SHOCK Electric shock hazard. Shut off all electrical power to the unit to avoid shock hazard or injury from rotating parts.
CAUTION! PRESSURE CLEANING High velocity water from a pressure washer or compressed air should only be used at a very low pressure to prevent fin and/or coil damages. The force of the water or air jet may bend the fin edges and increase airside pressure d
Quarterly cleaning is essential to extend the life of an e-coated coil and is required to maintain coating warranty coverage.
CAUTION! COIL CLEANERS Harsh chemicals, household bleach, or acid cleaners should not be used to clean outdoor or indoor e-coated coils. These cleaners can be very difficult to rinse out of the coil and can accelerate corrosion and attack the e-coating. I
Recommended Coil Cleaner
The following cleaning agent, assuming it is used in accordance with the manufacturer’s directions on the container for proper mixing (4:1 condensers & 8:1 evaporators) and cleaning, has been approved for use on ecoated coils to remove
Enviro-Coil Concentrate, Part Number HEC01.
Recommended Chloride Remover
NOTE: Before calling, technician should have model and serial number of the unit available for the customer service department to help answer questions regarding the unit.