4 A
ss
embly and connection
RITTAL Compact split cooling unit assembly and operating instructions
29
EN
4.5.4 Door limit
s
witch
– Each door limit switch must only be assigned to
one cooling unit.
– Several door limit switches may be connected in
parallel and operated on one cooling unit.
– The minimum cross-section for the connection
cable is 0.3 mm
2
for a cable length of 2 m.
– The line resistance to the door limit switch must not
exceed a maximum of 50
Ω
.
– The door limit switch only supports a floating con-
nection; no external voltages.
– The contact of the door limit switch must be closed
when the door is open.
The safety extra-low voltage for the door limit switch
is provided by the internal power pack: Current
approx. 30 mA DC.
• Connect the door limit switch to terminals 1 and 2
of the connector.
4.5.5 Note
s
on the flicker
s
tandard
The flicker limits specified in standard EN 61 000-3-3
and -3-11 are adhered to, provided the supply im-
pedance is less than approx. 1.5
Ω
.
Where necessary, the unit operator should measure
the connected impedance or consult the responsible
power supply company. If there is no way of influenc-
ing the supply impedance and sensitive installed
components (e.g. BUS) are subjected to interfer-
ence, a line reactor or starting-current limiting device
should be connected upstream of the cooling unit to
restrict the startup current of the cooling unit.
4.5.6 Potential equali
s
ation
RITTAL recommends connecting a conductor with a
nominal cross-section of at least 6 mm
2
to the poten-
tial equalisation connection point in cooling units,
and incorporating it into the existing potential equal-
isation system.
According to the standard, the PE conductor in the
mains connection cable is not classified as an equi-
potential bonding conductor.
4.6 Carryin
g
out the electrical in
s
tallation
4.6.1 In
s
tallin
g
the power
s
upply
• Complete the electric installation using the electri-
cal circuit diagram shown on the rear of the exter-
nal unit and on the interior side of the maintenance
cover of the internal unit (see Fig. 1 on page 25,
legend on page 30).
• If you would like the system messages from the
cooling unit to be evaluated via the system mes-
sage relay, you should also connect a suitable
low-voltage cable to connection clamps 3 – 5.
Fig. 5:
Electrical wiring plan no. 1
22
21
X1
L1 L2 L3
1 2 3 4 5
PE
3
8
2
B1
B5
B2
2
2
S1
Mains
1
2
3
4 3 2 1
1 3 5
2 4 6
95
2
2
4
96
4 3 2 1
1 2 3
1 2 3
1 2
1 2
3
4
K1
K2
D1 – 2
D0 – A
MS1
Serial
Level GRE
NTC_I RED
NTC_E BLUE
A1
M1
F3 2
M2
M4 D1 – 5
Term
D1 – 3 D1 – 1 D1 – 4
PE
PE
5
Power
X2 X3
M2.1
M1
F2
F3.1
U
4
PE
PE
PE
PE
W
V
F4.1
M2.2
M4.1
M4.2
M4.3
A2
A2
3~
M
F5.1
3~
M
F5.2
3~
M
F5.3
3~
M
M4.4
F5.4
3~
M
U
V W PE
U
VW PE
U
VW PE
U
V WPE
U
V WPE
U
V W PE
F4.2
2
4
2
4
3~
M
B4
B3
1 2
2 4 1
3
NTC_A YEL
NTC_C WHI
X10
L1
X20
1 2 3 4 5 6 7 8 9 10
X20
1 2 3 4 5 6 7 8 9 10
L2 L3
L1 L2 L3
PE
X10
L1L2 L3
L1 L2 L3
PE
Evaporator coil
Condenser
