27
REMOVE THE CONTROLS/DRIVE ENCLOSURE —
Confirm that the power supply disconnect is open and all
safety procedures are observed before removing the VFD. This
procedure minimizes the number of sensors and cables that
need to be disconnected.
1. For Q and R compressors, close the 2 filter drier isolation
valves (Fig. 21) and the 2 VFD isolation valves. Isolate
the refrigerant charge into the condenser to prevent a re-
frigerant leak if one of the motor terminals is accidentally
damaged during VFD removal or installation. For Q and
R compressors, evacuate the VFD coldplate through the
Schrader valve (Fig. 21) on the VFD drain isolation
valve.
2. Remove the shipping bracket between the VFD and the
compressor if it is still in place. See Fig. 22.
NOTE: For seismic units, do not remove the shipping
bracket.
3. Remove any conduits that bring power to the VFD.
4. Remove the nuts that secure the terminal box transition
piece to the motor housing.
5. Disconnect the motor leads from the motor terminals
(Fig. 23). Note the position of the motor terminal cable
lugs so they can be reinstalled with sufficient clearance
away from surrounding structure.
CAUTION
Do not rig the condenser before the control center and
compressor are removed. The condenser/compressor
assembly has a high center of gravity and may tip over
when lifted at the tubesheet rigging points, which could
result in equipment damage and/or serious personal injury.
WARNING
Do not attempt to remove the VFD without first closing the
refrigerant isolation valves. Failure to do so during VFD
removal will result in an uncontrolled refrigerant leak. A
refrigerant leak can damage the unit as well as displace
oxygen, causing asphyxiation.
OPTIONAL
HOT GA
S
BYPA
SS
LINE
EVAPORATOR
REFRIGERANT
LIQUID
TEMPERATURE
S
EN
S
OR
COOLER
REFRIGERANT
PUMPOUT
VALVE
Fig. 19 — Evaporator Refrigerant Liquid
Temperature Sensor on Bottom of Cooler
(Units with Q,R Compressors Shown)
a23-1635
LEAVING CHILLED
LIQUID TEMPERATURE
SENSOR
ENTERING CHILLED
LIQUID TEMPERATURE
SENSOR
ENTERING CONDENSER
LIQUID TEMPERATURE
SENSOR
LEAVING CONDENSER
LIQUID TEMPERATURE
SENSOR
Fig. 20 — Chiller End View
(Q,R Compressors Only)
a23-1563
VFD
REFRIGERANT
COOLING
I
S
OLATION
VALVE
VFD
REFRIGERANT
S
TRAINER
FILTER DRIER
I
S
OLATION VALVE
FILTER
DRIER
MOTOR
COOLING
S
IGHT
GLA
SS
FILTER DRIER
I
S
OLATION VALVE
S
CHRADER
VALVE
VFD DRAIN
I
S
OLATION
VALVE
Fig. 21 — VFD Refrigerant Isolation Valves
(Q,R Compressors Only)
a23-1663
S
HIPPING BRACKET
(FOR
S
EI
S
MIC UNIT
S
,
DO NOT REMOVE)
Fig. 22 — VFD Shipping Bracket
(Unit with R Compressor Shown)
a23-1664
Summary of Contents for EVERGREEN 23XRV
Page 53: ...53 Fig 60 Typical Field Wiring Schematic LF 2 VFD Shown NOTE See Notes for Fig 60 on page 56 ...
Page 54: ...54 Fig 60 Typical Field Wiring Schematic LF 2 VFD Shown cont a23 1585 ...
Page 55: ...55 Fig 60 Typical Field Wiring Schematic LF 2 VFD Shown cont a23 1586 ...
Page 60: ...60 Fig 63 23XRV Controls Schematic LF 2 ...
Page 64: ...64 FROM PREVIOUS PAGE Fig 67 23XRV Controls Schematic Rockwell Standard Tier VFD Shown cont ...