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Pre-Start Checks
The first 2 – 4 hours of operation after initial start-up is a critical time.
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Do not just start the system and leave.
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Pressure values, compressor and evaporator superheat, and inspecting for excessive vibrations and loose connections
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are some of checks that must be performed prior to leaving the system.
Verify that all service valves are fully open.
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Ensure that all refrigerant and electrical connections are tight.
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Verify that the wiring and piping is properly routed and secured.
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The compressor mounting bolts are properly adjusted (see compressor mounts on page 18).
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All fan motors and mounting brackets are tight.
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The condensing unit base and evaporator coil are properly secured.
Compressor Mounts
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Hermetic Compressors – hermetic compressor springs are mounted internally; check the compressor mounting bolts
to ensure the nuts have not become loose during shipment.
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Semi-Hermetic Compressors – most semi-hermetic compressors have external spring mounts and are factory
assembled. The following actions are required once the condensing unit is installed and before system start-up:
Loosen the upper mounting nuts.
o
Remove the spring steel clips from the mounting springs.
o
Retighten the upper mounting nuts until the compressor can float on the springs approximately 1/16"
o
between the mounting nut and rubber grommet.
Compressor
Mounting Foot
Failure to ensure the compressor mounts are properly tightened can result in fatigue to the system piping causing leaks
and poor system performance.
Section 5
Operational Start-Up
Mounting Nut
(Upper)
Locking
Device
Mounting Nut
(Lower)
Properly Adjusted Compressor
Mounting
Stud
Rubber
CAUTION
Spacer
Mounting
Spring
Mounting
Base
15
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