C6.2.7/0302-0903/E 11
In O
eration
25 Shut-off Valves and Adapters
Horizontal refrigeration scroll compressors are delivered either with brazed connections or threads for Rotalock shut
off valves. Brazed pipework can also fit compressors with Rotalock connections using adapters “A” and “B” in either
straight or angled “C”. (See fig. 7 and spare parts list ZFH/ZSH and ZBH)
Figure 2: Mounting parts for single operation
Figure 7: Shut off valves and adapters
26 Shell Temperature
Under rare circumstances caused by failure of system components such as the condenser or evaporator fan, or loss
of charge, and depending on the type of expansion control, the top shell and discharge line can briefly but repeatedly
reach temperatures above 177°C as the compressor cycles on its internal protection devices. Care must be taken to
ensure that wiring or other materials, which could be damaged by these temperatures, do not come into contact with
the shell.
27 System Evacuation and Charging Procedure
Before the installation is put into commission, it has to be evacuated with a vacuum pump. During the initial
procedure, suction and discharge shut-off valves on the compressor remain closed. The installation of adequately
sized access valves at the furthest point from the compressor in the suction and liquid line is advisable. Pressure
must be measured using a vacuum pressure (Torr) gauge on the access valves and not on the vacuum pump; this
serves to avoid incorrect measurements resulting from the pressure gradient along the connecting lines to the pump.
Delivery Scope
Mounting
2mm
Torque (Nm)
Rotalock 1”-14UNS 100
Rotalock 1¼-12UNF 150
Sight Glass 25-25.5
A
B
C
1 Pressure control
connection
2 gauge connection
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