AIR DISCHARGE
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| FIELD POWER | ||
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| SUPPLY CONN | ||
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| 7⁄8″ DIA HOLE WITH | ||
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| 1 1⁄8″ DIA KNOCKOUT | ||
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| AND 1 3⁄8″ DIA | ||
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| KNOCKOUT |
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| FIELD CONTROL | ||
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| SUPPLY CONN | ||
SUCTION LINE CONN |
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| 7⁄8″ DIA HOLE | |||||||||||||||||||
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| LIQUID LINE CONN |
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| A97009 |
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UNIT SIZE |
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| LIQUID TUBE | VAPOR TUBE | |||||||||||||||||||||||||
| Conn Dia |
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| Tube Dia | Conn Dia |
| Tube Dia | |||||||||||||||||||||||
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018, 024 |
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| 3/8 |
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| 3/8 | 5/8 |
| 5/8 | |||||||||||||||||
030, 036 |
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| 3/8 |
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| 3/8 | 3/4 |
| 3/4 | |||||||||||||||||
042, 048 |
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| 3/8 |
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| 3/8 | 7/8 |
| 7/8 | |||||||||||||||||
060 |
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| 3/8 |
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| 3/8 | 7/8 |
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NOTE: Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult your local distributor.
If refrigerant tubing or indoor coil is exposed to atmosphere, it must be evacuated to a minimum of 500 microns to eliminate contamination and moisture in the system.
Fig. 4ÐRefrigerant Tube Dimensions/Connections
4.After wrapping service valve with a wet cloth, tubing set can be brazed to service valve using either silver bearing or
5.Refrigerant tubing and indoor coil are now read for leak testing. This check should include all field and factory joints.
MECHANICAL CONNECTION (38CKQ MODELS)
1.Cut tubing to correct length, deburr, and size as necessary, making sure tube ends are square. If a large burr is evident, ID and OD must be deburred to allow tube to bottom in valve.
2.Remove lock nuts and ferrules from plastic bags taped to service panel. (See Fig. 5.)
VALVE FITTING
FERRULE
LOCK NUT
A92120
Fig. 5ÐMechanical Fitting Assembly (38CKQ)
3
If undersized, damaged, or elliptically shaped tubing is used when making connection, leaks could result.
3. Slide lock nut and ferrule onto each tube. (See Fig. 6.)
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| FERRULE |
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| LOCK NUT | |
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TUBING
A92121
Fig. 6ÐLock Nut/Ferrule Positioning (38CKQ)
4.Apply a few drops of refrigerant oil to ferrule and valve threads to reduce assembly torque and assist sealing.
5.Insert tube end into service valve until it bottoms.
6.Push ferrule into place and hand tighten nut until an increase in torque is felt.
7.Mark nut and tube and tighten
NOTE: A backup wrench on the hex part of the suction valve is required while tightening.
The tube end must stay bottomed in the service valve during final assembly to ensure proper seating, sealing, and rigidity.
MECHANICAL FITTING REPAIR
To replace damaged ferrule or tubing proceed as follows.
1.Attach gages to service valves.
2.Close liquid service valve and operate unit to pump refrigerant charge into condenser coil.
3.When suction pressure reaches 5 psig, shut unit off. Do not operate unit in a vacuum.
4.Close suction service valve and recover refrigerant in tubing.
5.
6.Remove damaged part of tubing using tubing cutter. Repeat installation procedure previously outlined using new ferrule.
7.Evacuate tubing set and indoor coil. Check for leaks.
8.Open service valves or recharge unit. Check refrigerant charge.
Step 7ÐInstall Solenoid Valve In Liquid Tube (If Re- quired)
Not all applications require use of a liquid tube solenoid valve. If your unit has been shipped with a liquid tube solenoid valve in the unit, it must be installed for performance enhancement. The liquid tube solenoid valve must be ener- gized during evacuation for complete removal of refrigerant.
Before making liquid tube connections, install