11. Electrial checks of main parts
448
SMGB0079 rev.0 - 01/2013
11.4 High pressure protection device
If the discharge pressure is excessively high the compressor and the component parts of the refrigeration cycle can be
damaged.
• High Pressure Switch:
In case that the discharge pressure is higher than 4.15 MPa (R410A) the protection control is activated and the compressor
is stopped.
• Pressure Switch for Control:
In case that the discharge pressure is higher than 3.6 MPa (R410A) the protection control might be performed.
RAS-(2-2.5)HVNP / RAS-3HVNC
High pressure
switch
Pressure switch
for control
Brazing
RAS-3HVNPE RAS-(4-6)H(V)NPE
Upper Cover
Discharge Pipe
Brazing
Part
Brazing Part
Low Pressure Switch
(PSL)
Suction Pipe
High Pressure Switch
(PSH)
Pressure Sensor
for PD Control
Electrical Box
Discharge pipe
Electrical Box
Upper cover
High pressure
switch
Pressure sensor
for PD control
Brazing
part
Low pressure
switch
Suction pipe
Brazing part
Discharge Pipe
Brazing Part
Brazing Part
Brazing Part
Low Pressure Switch (PSL)
Suction Pipe
High Pressure Switch (PSH)
Pressure Sensor for PD Control
to DRM1 and SC terminals.
or transmission wiring
Do not connect power supply
17E26270A
CAUTION
SCAS4755 DRM1
PCN1
TR1
IC1
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