Bitzer SE-i1, Technical Information, Page: 18 / 56

CT-110-2 18
6.2 Schematic wiring diagrams for HS.53 .. HS.85
compressors
HS.53 .. HS.74: Paths 41 .. 44 see figure 20, page 21.
HS.85: Paths 27 .. 44 see figure 24, page 25.
Abbr. Component
B1 Oil thermostat ①
B2 Control unit (cooling demand) or command for
compressor start (release signal from the sys-
tem controller) or controller On/Off
B6 High pressure transmitter
B7 Low pressure transmitter
F1 Main fuse
F2 Compressor fuse
F3 Control circuit fuse
F4 Oil heater fuse
F5 High-pressure switch
F6 Low pressure switch
F7 Oil flow switch
F9 Monitoring of oil stop valve
F10 Oil filter monitoring
F12 ECO control unit; pressure switch (ECO)
(ATEX)
F13 Thermal overload relay "motor" PW1; star-
delta: thermal overload relay "motor"
F14 Thermal overload relay "motor" PW2; star-
delta: –
F17 Control transformer fuse
F21 Fuse of the heating element in the terminal
box (only for HS.53 .. HS.74)
H1 Signal lamp "motor failure" (overtemperature/
phase failure)
H2 Signal lamp “pause time”
H4 Signal lamp “oil level fault”
H5 Signal lamp "oil stop valve fault”
K1 Contactor "1st part winding" (PW) or main
contactor (star-delta) or compressor contactor
(DOL or FI or soft starter)
K2 Contactor "2st part winding" (PW) or delta
contactor (star-delta)
K3 Auxiliary relay or star contactor (star-delta)
K4 Auxiliary contactor “oil level”
K1T Time relay “oil flow monitoring” HS.85: oil sup-
ply monitoring 20 s
K2T Time relay “pause time” 300 s
Abbr. Component
K3T Time relay "part winding" 0.5 s or "star-delta
start" 1 s "star-delta start" only HS.85: 1.5 ..
2 s
K4T Time relay "oil level monitoring 120 s" ①
K5T Time interval relay "CR4" flashing function
on / off 10 s
M1 Compressor
N1 Frequency inverter (FI)
N3 Soft starter
Q1 Main switch
R1 Oil heater ①
R2 Discharge gas temperature sensor
R3..8 PTC sensor in motor
R9 Heating element for terminal box (only for
HS.53 .. HS.74)
R10 Optional temperature sensor
R11 Auxiliary resistor
S1 Control switch (on/off)
S2 Fault reset "motor & discharge gas temperat-
ure, motor rotation direction, oil flow" and for
HS.85: Fault reset "motor & discharge gas
temperature, motor rotation direction, oil sup-
ply”
S3 Cancellation “pause time”
S4 Fault reset “oil filter chamber” (HS.85)
T1 Control transformer (example for 230 V, re-
quired according to EN60204-1)
U Interference suppressor: varistor or RC ele-
ment integrated into the solenoid valve plug if
required
Y2 Solenoid valve "liquid line"
Y3 Solenoid valve “shut-down bypass”
Y4 Solenoid valve "capacity regulator CR1"
Y5 Solenoid valve "capacity regulator CR2"
Y6 Solenoid valve "capacity regulator CR3"
Y7 Solenoid valve "capacity regulator CR4"
Y8 Solenoid valve "ECO" (if required)
Tab. 5: Legend schematic wiring diagrams for HS. compressors
①: Components are included in the scope of delivery of
the oil separator
OLC-D1: Opto-electronic liquid level monitoring. In-
cluded in the extent of delivery of the oil separator.
SE-B*: Protection device for oil flow monitoring and oil
filter monitoring