Disassembly
CVHS-SVN04E-EN
11
7. Mark and disconnect the wires that run between the
drive and the control panel at the drive and pull the
conduit out of the AFD cabinet.
8. Mark and disconnect the refrigerant pump wires from
the terminal block and pull conduit out of the AFD
cabinet.
9. Mark and disconnect drive communication cable at
terminal block and pull the cable out of the AFD
cabinet.
10. Support the weight of the AFD cabinet with a fork truck
or another suitable lifting device (minimum 2-ton rated
capacity).
11. Loosen and remove the hex head screws that secure
the AFD cabinet to the lower mounting brackets.
Unhook the right side at the L-bracket welded to the
condenser, four screws total. Unhook the left side at
the condenser support leg, four screws and nuts total.
12. Carefully lift the AFD cabinet away from the chiller. Do
NOT bump or jolt the AFD while lifting.
Installation of the AFD cabinet is essentially the reverse of
the removal procedure. All mounting screws should be
torqued to ANSI standards based on the screw diameter.
The motor power wires connecting to the drive output
terminals should be torqued according to the label inside
the AFD cabinet. Tighten the control wires that connect to
the AFD terminal block to 8.3 ft-lb (11.3 N-m). The motor
powers wires connecting to the motor terminals inside the
compressor motor junction box shall be torqued between
20–26 ft·lb. Torque the corresponding ground cables
inside the compressor motor junction box to 38 ft·lb. Refer
to the as-built wiring diagrams for connection locations.
Purge Unit Removal
To remove the purge assembly from the top of the
condenser:
1. Isolate the purge unit from the condenser shell by
closing the vapor and liquid line valves.
2. Disconnect and mark all piping and wiring attached to
the purge unit. Sand all paint off at points and use a
tubing cutter where cuts are to be made. See
Figure 3,
p. 11
and
3. Remove the fasteners connecting the purge unit base
to its mounting bracket.
4. Two people will be needed to lift purge unit clear of the
chiller. Refer to
Store the purge unit in a clean dry area.
Reassemble the purge unit in reverse order when the
process is complete.
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.
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with an appropriate
voltmeter that all capacitors have discharged. Failure to
disconnect power and discharge capacitors before
servicing could result in death or serious injury.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06A-EN
Figure 3.
Purge unit
