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eight fasteners attaching the roof panel to the module.
Position a lifting device over the tandem compressors.
Remove Through the Side C Top Panel: Where there
is a minimum of 36 inches of rear clearance, remove the
fasteners attaching the upper Side C panel to the module.
Position supports on the middle level framing sufficient to
slide the tandem compressors out the rear.
1. Close the suction and discharge rotalock valves (if so
equipped). Firmly front-seat both rotalock valves
clockwise.
Note: Do not over-tighten as a rotalock valve can become
difficult to loosen if over-tightened.
2. Recover the refrigerant from the high and low sides of
the compressor using a suitable vacuum recovery
machine and clean recovery cylinder.
3. Detach the refrigeration lines from the compressor
suction and discharge stubs. Reconnect rotalock
valves.
4.
Evacuate the compressor using the connections on
the suction and discharge stubs to 500 microns or
lower (250 to 500 micron range is ideal).
5. Disconnect the compressor power lines and all
associated power leads.
6. Observe the oil level in each compressor via the sight
glass and confirm the oil level is below the oil line
connector opening.
7. Disconnect and cap the threaded oil line on each
compressor.
8. Remove the four mounting bolts holding each
compressor to the middle frame.
9. Position a lifting device (top removal) or support
bracing (rear removal) and ensure there is sufficient
clearance as the compressors are moved.
10. Remove the compressors from the module by lifting or
sliding.
Install Tandem Compressors
Verify that power is disconnected from the chiller/heater.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is present
with a voltmeter.
1. Position the tandem compressors into the chiller/
heater using the same method used for removal.
2. Position the compressors in position and attach to the
frame with eight mounting bolts, washers, and nuts.
Tighten nuts with 1/2-inch socket and wrench.
ARTC-SVX005A-EN
3. Install the rotalock nuts on the compressor suction and
discharge connections. The recommended torque is 80
lbf for 2-inch and larger and 60 lbf for rotalock nuts
smaller than 2-inch. Tighten with a narrow spud
wrench.
4. Evacuate the compressors using the connections on
the suction and discharge stubs to 500 microns or
lower (250 to 500 micron range is ideal).
5. Attach compressor power lines, all associated power
leads, and safeties in the compressor electrical box.
6. Re-connect the threaded oil line on each compressor.
7. Observe the oil level in each compressor via the sight
glass and confirm the oil level is visible.
8. Open all rotalock valves (if so equipped) until fully
back-seated counterclockwise.
NOTICE
Valve Damage!
Applying excessive force when fully opening an
isolation valve could cause valve damage. The valve
could bind in the fully open position and prevent proper
service isolation.
9. Restore power to the module containing the
compressor by turning the circuit breakers CB-1 and
CB-2 to the ON position.
10. Observe the newly installed tandem compressors to
verify that all connections have been seated and
tightened correctly.
Maintenance Procedures
61
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