Refrigeration Service Operations
139
6. Re-install the coupling and align the keyways
with the Keyway Tool.
7.
Do not install the key at this time.
Install the
flat washer and bolt and pre-torque to 20 ft-lb
(27 N•m). Remove the bolt and washer.
8. Install the key in the keyway. As above, it
should fit with a light press fit requiring only a
minimum of light tapping.
Do not install the
key into the keyway beyond the front face
of the coupling.
If tapped in farther it may
cause the coupling to move off center on the
shaft.
9. Re-install the bolt and heavy flat washer and
snug the bolt down by hand. Torque the bolt to
90 ft-lb (122 N•m).
10. Spray a corrosion inhibitor (such as spray
paint) on the exposed part of the shaft and the
joint between the shaft and the coupling. This
prevents moisture from wicking into the joint
and causing corrosion.
Curbside Condenser Coil
Removal
1. Recover the refrigerant charge.
2. Open the top door and curbside condenser
grille.
3. Unsolder the inlet and outlet refrigeration line
connections from the copper stub tubes on the
micro-channel condenser coil. Make sure to
use a heat sink on the copper stub tubes.
IMPORTANT: This unit uses micro-channel
condenser coils. Micro-channel coils are
make of aluminum but have copper stub
tubes at the inlet and outlet connections.
Make sure to use a heat sink on the copper
stub tubes to prevent damage to the heat
shrink tubing and brazed connections (and
the aluminum) that attached the copper stub
tubes to the aluminum micro-channel coil.
The heat shrink tubing is used to prevent
corrosion between the copper and aluminum.
4. Remove the condenser coil mounting bolts
and lift the coil from the unit.
Installation
1. Clean the fittings for soldering.
2. Place the coil in the unit and install the
mounting bolts.
3. Solder the inlet and outlet refrigeration line
connections to the copper stub tubes on the
micro-channel condenser coil. Make sure to
use a heat sink on the copper stub tubes.
1.
Compressor Coupling or Clutch
2.
Key tapped flush with outside face of coupling.
Do not tap key any farther into keyway.
3.
Torque bolt to 90 ft-lb (122 N•m)
4.
Washer
5.
Spray this area with corrosion inhibitor after
assembling.
Figure 222: Compressor Coupling Installation
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AGA1254
1.
Aluminum Micro-Channel Condenser Coil
2.
Heat Shrink Tubing (Protects Brazed
Connection between Copper Stub Tube and
Aluminum Micro-Channel Condenser Coil)
3.
Copper Stub Tube
Figure 223: Top View of Curbside Condenser Coil
ARA1986
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