SERVICING
NOTICE
Violation of EPA regulations may result in fines or other penalties.
Now determine if a burn out has actually occurred. Confirm by analyzing an oil sample using a Sporlan Acid Test Kit, AK- 3 or its equivalent.
Remove the compressor and obtain an oil sample from the suction stub. If the oil is not acidic, either a burnout has not occurred or the burnout is so mild that a complete
If acid level is unacceptable, the system must be cleaned by using the
CAUTION
Do not allow the sludge or oil to contact the skin. Severe burns may result.
NOTE: The Flushing Method using
Suction Line Drier
Use AMANA® brand part number RF000127 suction line filter drier kit. This drier should be installed as close to the compressor suction fitting as possible. The filter must be accessible and be rechecked for a pressure drop after the system has operated for a time. It may be necessary to use new tubing and form as required.
NOTE: At least twelve (12) inches of the suction line immediately out of the compressor stub must be discarded due to burned residue and contaminates.
1.Remove compressor discharge line strainer.
2.Remove the liquid line drier and expansion valve.
3Purge all remaining components with dry nitrogen or carbon dioxide until clean.
4.Install new components including liquid line drier.
5.Braze all joints, leak test, evacuate, and recharge sys- tem.
6.Start up the unit and record the pressure drop across the drier.
7.Continue to run the system for a minimum of twelve (12) hours and recheck the pressure drop across the drier. Pressure drop should not exceed 6 PSIG.
8.Continue to run the system for several days, repeatedly checking pressure drop across the suction line drier. If the pressure drop never exceeds the 6 PSIG, the drier has trapped the contaminants. Remove the suction line drier from the system.
9.If the pressure drop becomes greater, then it must be replaced and steps 5 through 9 repeated until it does not exceed 6 PSIG.
NOTICE: Regardless, the cause for burnout must be deter- mined and corrected before the new compressor is started.
S-120 REFRIGERANT PIPING
The piping of a refrigeration system is very important in relation to system capacity, proper oil return to compressor, pumping rate of compressor and cooling performance of the evaporator.
This long line set application guideline applies to all AHRI listed R22 air conditioner and heat pump split system matches of nominal capacity 18,000 to 60,000 Btuh. This guideline will cover installation requirements and additional accessories needed for split system installations where the line set exceeds 50 feet in actual length.
Additional Accessories:
1.Crankcase Heater- a long line set application can critically increase the charge level needed for a system. As a result, the system is very prone to refrigerant migration during its
2.TXV Requirement: All line set applications over 50 ft will require a TXV.
3.Hard Start Assist- increased charge level in long line applications can require extra work from the compressor at
4.Liquid Line Solenoid - A long line set application can critically increase the charge level needed for a system. As a result, the system is very prone to refrigerant migration during its
Tube Sizing:
1.In long line applications, the “equivalent line length” is the sum of the straight length portions of the suction line plus losses (in equivalent length) from 45 and 90 degree bends. Select the proper suction tube size based on equivalent length of the suction line (see Tables 9 & 10) and recalculated system capacity.
Equivalent length = Length horizontal + Length vertical + Losses from bends (see Table 11)
2.For any residential split system installed with a long line set, the liquid line size must never exceed 3/8". Limiting the liquid line size to 3/8" is critical since an increased refrigerant charge level from having a larger liquid line could possibly shorten a compressor’s lifespan.
3.Single Stage Condensing Unit: The maximum length of tubing must not exceed 150 feet.
•50 feet is the maximum recommended vertical differ- ence between the condenser and evaporator when the evaporator is above the condenser. Equivalent length is not to exceed 150 feet.
•The vertical difference between the condenser and evaporator when the evaporator is below the condenser can approach 150 feet, as long as the equivalent length does not exceed 150 feet.
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