desmon GBC-15, Service Manual

Page: 90 / 100

Rev 07/04/2015
50
5.1.2 Remote Models
Attach vacuum pump to the compressor check pressure valve and liquid receiver valve
(shown above).
A split evaporator unit is also equipped with one or more additional valves that can be
used to pull a vacuum and charge the system. This valve can be used to pull a vacuum in
the evaporator unit in two ways:
1. Pull a vacuum in the entire system with the condensing and evaporating units
connected and recharge the entire system.
2. Because these units are equipped with refrigerant valves (or self-closing quick-
connections in some models), the condensing section can be separated. A vacuum
can be pulled and refrigerant can be charged in this section. A vacuum can then be
pulled on the evaporator section. Connect both suction and liquid lines to the
evaporator to pull a vacuum into them as well. Once the system has been pumped
down, simply connect the lines to the condensing unit that has already been
charged.
This last option is very helpful if only one side of the system is to be opened for repair. For
example: if a compressor needs to be replaced, it’s not necessary to open the entire
system. Simply disconnect the lines at “Lc” & “Sc” to remove the compressor.
5.1.3 Vacuum and Charging Recommendations
•
Use a vacuum pump rated at 50gpm minimum.
•
Pull the vacuum for 1½ hours minimum
•
Replace the filter/drier whenever the system has been opened.
QUICK CONNECTIONS
EVAPORATOR SIDE
(TOP OF THE CABINET)
QUICK CONNECTIONS
UNSCREWING
QUICK CONNECTIONS
CONDENSER SIDE
(CONDENSER BOX)
L
e
S
e
L
c
S
c
CONNECTING
PIPE