66
EEV PCB
24 V~
230 V~
L
N
?
L
N
?
L
N
?
L
N
?
C
D
E
F
G
S
R
P
O
N
M
L
K
H
L N
L N
A
B
Fig. 27
A
Compressor relay
B
Mains voltage
C
Never connect anything here.
D
Never connect anything here.
E
Never connect anything here.
F
Enable compressor switching
G
Never connect anything here.
H
KM-BUS
K
Never connect anything here.
L
Liquid gas temperature sensor (Pt500A)
M
Hot gas temperature sensor (Pt500A)
N
High pressure sensor
O
Suction gas temperature sensor (Pt500A)
P
Low pressure sensor
R
EEV stepper motor: See fig. 28.
S
Power supply
EEV stepper motor
Fig. 28
Checking the control panel for vapour tightness
Danger
Risk of explosion: Electrical components can
cause sparks which may be ignited by escaping
refrigerant.
After every time the control panel is opened or
closed, check the casing door for vapour tight-
ness to EN 60079-15.
Use a suitable testing device to check for vapour tight-
ness, e.g. the handheld vapour tightness tester availa-
ble from R. Stahl Schaltgeräte GmbH.
Maintenance
Electrical connections to the heat pump
(cont.)
5800 917 GB
Maintenance