9.Cut the vaporizer refrigerant return line as shown.
10.Disconnect all sensors with cables that cross from the condenser side of the machine to the cooler side including:
a.Evaporator refrigerant liquid temperature sensor. See Fig. 13.
b.Entering and leaving chiller liquid temperature sensors. See Fig. 14.
c.Evaporator pressure sensor.
11.Disconnect the tubesheet mounting brackets from the vessel connectors on the tube cooler tubesheet.
12.Cover all openings.
13.Rig the cooler away from the condenser/compressor.
NOTE: To reassemble, follow steps in reverse order. Connect sensors and cables after major components have been secured to reduce the risk damaging them.
OPTIONAL
HOT GAS
BYPASS LINE
EVAPORATOR
REFRIGERANT
LIQUID
TEMPERATURE
SENSOR
COOLER
REFRIGERANT
PUMPOUT
VALVE
a23-1635
Fig. 13 — Evaporator Refrigerant Liquid Temperature Sensor on Bottom of Cooler
LEAVING CONDENSER | LEAVING CHILLED |
LIQUID TEMPERATURE | LIQUID TEMPERATURE |
SENSOR | SENSOR |
ENTERING CONDENSER |
| ENTERING CHILLED | |
LIQUID TEMPERATURE |
| LIQUID TEMPERATURE | |
SENSOR | SENSOR | ||
|
Fig. 14 — Chiller End View
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.
REMOVE THE CONTROLS/DRIVE ENCLOSURE FROM THE CONDENSER — 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.
Do not attempt to remove the VFD without first isolating the refrigerant charge in the condenser. Damage to one of the motor terminals during VFD removal will result in an uncontrolled refrigerant leak.
1.Close the 2 filter drier isolation valves (Fig. 15) and the 2 VFD isolation valves. Isolate the refrigerant charge into the condenser to prevent a refrigerant leak if one of the motor terminals is accidentally damaged during VFD removal or installation. Evacuate the VFD coldplate through the Schrader valve (Fig. 15) on the VFD drain isolation valve.
2.Remove the shipping bracket between the VFD and the compressor if it is still in place. Remove any conduits that bring power to the VFD. See Fig. 16.
VFD |
|
REFRIGERANT |
|
COOLING |
|
SOLENOID | SCHRADER |
VALVE | |
VFD | VALVE |
| |
REFRIGERANT |
|
COOLING |
|
ISOLATION | VFD DRAIN |
VALVE | ISOLATION |
VFD | VALVE |
REFRIGERANT |
|
STRAINER |
|
|
| MOTOR | FILTER DRIER | |
FILTER DRIER | FILTER | COOLING | ||
SIGHT | ISOLATION VALVE | |||
ISOLATION VALVE | DRIER | |||
GLASS |
| |||
|
|
|
a23-1564
Fig. 15 — VFD Refrigerant Isolation Valves
14
