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Disassembly
Unit-mounted Starter Removal
If you need to temporarily remove the entire AFD cabinet
from the chiller to allow unit installation through restricted
spaces or the AFD cabinet shipped disassembled from the
chiller, use the following general information and
instructions. The maximum weight of the drive is 1900 lb
(862 kg).
Note: For specific weights of the AFD cabinet, refer to
submittal package.
WARNING
Heavy Objects!
Failure to follow instructions below or properly lift
component could result in component dropping and
possibly crushing operator/technician which could
result in death or serious injury, and equipment or
property-only damage. Ensure that all the lifting
equipment used is properly rated for the weight of the
component being lifted. Each of the cables (chains or
slings), hooks, and shackles used to lift the component
must be capable of supporting the entire weight of the
component. Lifting cables (chains or slings) may not be
of the same length. Adjust as necessary for even
component lift.
WARNING
Improper Unit Lift!
Failure to properly lift unit could result in death or
serious injury or possible equipment or property-only
damage. Test lift unit approximately 24 inches (61 cm)
to verify proper center of gravity lift point. To avoid
dropping of unit, reposition lifting point if unit is not
level.
1. Remove the AFD upper support bracket hex head
screws at the wrap-around pipe side. There are two
screws in each bracket.
2. Close the isolation valves for the AFD cooling lines,
both feed and return.
10
WARNING
Hazard of Explosion and Deadly Gases!
Failure to follow all proper safe refrigerant handling
practices could result in death or serious injury.
Never solder, braze or weld on refrigerant lines or any
unit components that are above atmospheric pressure
or where refrigerant may be present. Always remove
refrigerant by following the guidelines established by
the EPA Federal Clean Air Act or other state or local
codes as appropriate. After refrigerant removal, use dry
nitrogen to bring system back to atmospheric pressure
before opening system for repairs. Mixtures of
refrigerants and air under pressure may become
combustible in the presence of an ignition source
leading to an explosion. Excessive heat from soldering,
brazing or welding with refrigerant vapors present can
form highly toxic gases and extremely corrosive acids.
WARNING
Refrigerant under Positive Pressure!
Failure to follow instructions below could result in an
explosion which could result in death or serious injury
or equipment damage. System contains refrigerant and
may be under positive pressure. Recover refrigerant to
relieve pressure before opening the system. See unit
nameplate for refrigerant type. Do not use non-
approved refrigerants, refrigerant substitutes, or
refrigerant additives.
Important:
Any unit pressure must be relieved before
disconnecting refrigerant lines. The units
ship from the factory with a 5 psi dry
nitrogen holding charge.
3. Disconnect the AFD cooling lines at the bottom of the
elbows coming out of the chill plate, both feed and
return. Cap the lines and chill plate elbows to prevent
debris from entering the system.
4. Mark and disconnect the motor power wires at the
drive output terminals and inside motor junction box.
There will be six power wires and two ground wires.
Note: Always compare the wire connections to the
as-built wiring diagrams to assure the
schematics match the actual connections. Make
notes as necessary to assure the wires are
reconnected to the same locations.
5. Remove wire tray covers and completely remove wires
from wire tray. Disassemble and remove the wire tray
by unscrewing the tray at the compressor junction box
and then removing the screws from support bracket on
the AFD cabinet.
6. Mark and disconnect the high pressure cutout switch
wires at the terminal block and pull the cable out of the
AFD cabinet.
CVHS-SVN04E-EN
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