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AIR DISCHARGE
SUCTION LINE CONN
LIQUID LINE CONN
LIQUID TUBE
UNIT SIZE
Conn Dia
018, 024
3/8
030, 036
3/8
042, 048
3/8
060
3/8
Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50
ft, consult your local distributor.
Fig. 2—Refrigerant Tube Dimensions/Connections
Fig. 3—Mechanical Fitting Assembly (38CKN)
FERRULE
TUBING
Fig. 4—Lock Nut/Ferrule Positioning (38CKN)
FIELD POWER
SUPPLY CONN
" DIA HOLE WITH
7
⁄
8
" DIA KNOCKOUT
1
1
⁄
8
" DIA
3
AND 1
⁄
8
KNOCKOUT
FIELD CONTROL
SUPPLY CONN
" DIA HOLE
7
⁄
8
VAPOR TUBE
Tube Dia
Conn Dia
Tube Dia
3/8
5/8
5/8
3/8
3/4
3/4
3/8
7/8
7/8
3/8
7/8
1-1/8
VALVE FITTING
FERRULE
LOCK NUT
LOCK NUT
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. Back-off locknut and ferrule onto tube.
6. Remove damaged part of tubing using tubing cutter. Repeat
installation procedure previously outlined using new ferrule.
A93578
7. Evacuate tubing set and indoor coil. Check for leaks.
8. Open service valves or recharge unit. Check refrigerant
charge.
Fig. 5—Proper Marking of Valve Assembly (38CKN)
Step 4—Install Solenoid Valve In Liquid Tube (If Re-
quired)
A92120
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 factory-supplied
solenoid valve on indoor liquid fitting. (See Fig. 6.) Be sure to use
flare adapter supplied with the indoor coil when making connec-
tions.
Wiring must comply with local codes and NEC requirements,
A92121
if a field-supplied control power source is needed when
adding solenoid.
1. Remove coil liquid connection cap and discard.
2. Mount solenoid valve on liquid tube, making sure valve flow
arrow points toward indoor coil. Mount valve in any position
except valve body at top and electric coil at bottom. (See Fig.
2
LOCK NUT
TUBING
MARK ON LOCK NUT
AND TUBE
A92122
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