MAINTENANCE
Compressor Replacement
Since each machine room tends to be unique,
plan carefully as to how you will move the
compressors without harming personnel,
equipment or the building. Before beginning
removal of old compressor, make replacement
unit ready to install:
Verify
Replacement compressor
Electrical requirements
Refrigerant application
Capacity
Piping hookup location and design
Suction and discharge gaskets
Mounting requirements.
Have compressor in an easily accessible
position, uncrated and unbolted from shipping
pallet.
Disconnect Electrical Supply
Turn off motor and control panel power
supplies to the Rack.
Turn off control circuit and open all compres-
sor circuit breakers.
Tag and remove electrical wires and conduit
from the compressor.
Isolate Compressor from Rack
Front-seat Suction and Discharge Service
Valves. Close oil supply and equalizing lines.
Bleed compressor pressure through both dis-
c h a r ge and suction access ports into an
approved recovery vessel.
Remove oil supply and equalizing lines.
Remove externally mounted components
which will be re-used on the replacement
compressor.
Plug holes to compressor manufacturer's
specifications.
Remove bolts from suction and discharge
service valves.
Remove mounting bolts.
When moving the compressor, use a come-
along, hoist or hydraulic lift to carry the
weight.
Do not use the rack piping or panel to support
a hoist or come-along.
Do not use ceiling trusses to support a hoist or
come-along.
The rear support channel on the rack or a
properly constructed ceiling rail may be used
to support a hoist or come-along.
To make hookup and lifting easier, an eye bolt
may be installed in the rear top of the com-
pressor head.
If a compressor removal table is used, slide
the compressor fully on to the table, then roll
table to overhead hoist or hydraulic lift area.
When the old compressor has been removed,
clean the suction and discharge service valve
gasket surfaces to shiny metal. Clean the
gasket surfaces on the new compressor to
shiny metal. Be careful not to groove or round
the surfaces. Gasket surfaces must be clean to
prevent leaking.
Install the new compressor in reverse order of
removal. Do not open the new compressor to
the system until after it has been leak tested
and triple evacuated.
Note: Oil level regulator sight glasses are designed to
provide a hermetic seal when internally pressurized.
Some leaking may occur when a deep vacuum is
pulled.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
Revised August 1, 1996 P/N 340272A
9 - 5
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