Carrier 38CKC Installation And Start-Up Instructions Manual page 4

Fig. 4—Mechanical Fitting Assembly (38CKQ)
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. 5.)
FERRULE
TUBING
Fig. 5—Lock 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 1-1/2 turns from mark. (See
Fig. 6.) Keep tube bottomed in valve while tightening nut.
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. Back off locknut and ferrule onto tube.
VALVE FITTING
FERRULE
LOCK NUT
A92120
LOCK NUT
A92121
Fig. 6—Proper Marking of Valve Assembly (38CKQ)
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.
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IMPORTANT: Check factory tubing on both indoor and outdoor
unit to ensure tubes are not rubbing against each other or any sheet
metal. Pay close attention to feeder tubes, making sure wire ties on
feeder tubes are secure and tight.
Step 7—Make Electrical Connections
To avoid personal injury or death, do not supply power to unit
with compressor terminal box cover removed.
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits shown
on unit rating plate. Contact local power company for correction of
improper voltage. See unit rating plate for recommended circuit
protection device.
NOTE: Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability. See unit rating plate. Do not
install unit in system where voltage or phase imbalance (3 phase)
may fluctuate above or below permissible limits.
NOTE: Use copper wire only between disconnect switch and
unit.
NOTE: Install branch circuit disconnect of adequate size per
NEC to handle unit starting current. Locate disconnect within sight
from and readily accessible from unit, per Section 440-14 of NEC.
ROUTE GROUND AND POWER WIRES
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into unit
control box.
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault
should occur. The ground may consist of electrical wire or
metal conduit when installed in accordance with existing
electrical codes. Failure to follow this warning can result in an
electric shock, fire, or death.
4
LOCK NUT
TUBING
MARK ON LOCK NUT
AND TUBE
A92122