Purge Unit Removal - Trane CenTraVac CVHM Installation Instructions Manual

Water-cooled chillers disassembly and reassembly units

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Table Of Contents

Table of Contents

Disassembly

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 oil and

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 unbolting 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.

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 oil/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 bolts that secure the AFD

cabinet to the lower mounting brackets. Unhook the

right side at the L-bracket welded to the condenser, four

bolts total. Unhook the left side at the condenser

support leg, four bolts and nuts total.

12. Carefully lift the AFD cabinet away from the chiller. Do

not bump or jolt the AFD while lifting.

Important:

In cases where the unit is being installed

through restricted spaces, the oil tank filter

may need to be temporarily removed. Prior

to removal of the filter, switch the regulator

to the "change filter" setting. After the filter

has been removed from the regulator block,

the opening must be sealed to ensure no

contaminates are allowed into the system.

Due to the hygroscopic nature of the oil,

install a new filter after the chiller has

passed through the restricted space.

Installation of the AFD cabinet is essentially the reverse of

the removal procedure. All mounting bolts should be

torqued to ANSI standards based on the bolt diameter. The

motor power wires connecting to the drive output

terminals should be torqued according to the label inside

the AFD cabinet. Tighten the power 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.