7
3.6 - Actuators
Electronic Expansion Valve
The electronic expansion valve (EXV) is used to adjust the
machine. The high degree of accuracy with which the piston
and suction superheat.
Flow switch
operation and protection of the system is maintained. If the
Water pumps (optional)
The controller can independently regulate each water heat
control based on the minimum pump speed setpoint.
temperature difference or the water pressure difference.
Boiler
If there is a unit fault in the heating mode this output authorises
start-up and shutdown of a boiler. 30WG/30WGA units can
by the controller in case of heating demand. For 61WG units,
the boiler is activated when the operating conditions are not
suitable for thermodynamic heating or the unit is down due
to a detected failure. See also section 8.10.1.
Electric heaters
Electric heaters are used as a supplementary heating source
in the heating mode. See also section 8.10.2.
3.7 - Available connections
Connections available at the user terminal block may vary
depending on the selected options. The following table
summarizes connections at the user terminal block.
IMPORTANT: Some contacts can be accessed only when
the unit operates in Remote mode.
3.7.1 - Terminal block connections
Description Board Connector Remarks
Remote On/O
contact
SIOB,
cir A
+:32/ -:33 Used for the unit on/o
control (Remote mode)
Remote Heat/
Cool contact
SIOB,
cir A
+:63/ -:64 Used to set cooling and
heating when the unit is in
Remote mode
Switch-
controlled
demand limit
SIOB,
cir A
+:73/ -:74 Used to control demand
limit
Switch dual
setpoint
SIOB,
cir A
+:65/ -:66 Used to select the second
cooling setpoint
Lock switch SIOB,
cir A
+:34/ -:35 Used for the customer
safety loops
Condenser
3-way valve
SIOB,
cir A
+:80+/-:80- Used to control the water
ow on the condenser side
Boiler SIOB,
cir A
+:69/ -:70 Used to command a boiler
Running SIOB,
cir A
+:37/-: 38 Used to signal a running
status (at least one
compressor start)
Description
(cont.)
Board
(cont.)
Connector
(cont.)
Remarks
(continued)
Alarm SIOB,
cir A
+: 30/-: 31 Used to signal an alarm
Domestic hot
water (DHW)
AUX1 -:310 /
CH12: 311
Used to control domestic
hot water production
Domestic hot
water (DHW)
priority switch
AUX1 -:312 /
+:313
Used to control domestic
hot water priority
Summer
switch
AUX1 -:323 /
+:322
Used to stop the Space
Heating loop additional
pump during summer time
Electrical
Heater Stage 1
AUX1 341 / 12 Used to control the
electrical heater stage 1
Electrical
Heater Stage 2
AUX1 342 / 12 Used to control the
electrical heater stage 2
Electrical
Heater Stage 3
AUX1 343 / 12 Used to control the
electrical heater stage 3
Electrical
Heater Stage 4
AUX1 344 / 12 Used to control the
electrical heater stage 4
Additional
pump
command
AUX1 365 / 12 Used to command the
additional pump in case of
DHW option
DHW
diverting valve
AUX1 340 / 12 Used to command the DHW
loop in case of DHW option
3.7.2 - Volt-free contact (on/off and cooling/heating)
For units with a boiler, on/off contacts and cooling/heating
contacts are as follows:
Cooling Heating
open closed closed
Cooling/Heating contact open open closed
O: Unit is stopped
Cooling: Unit is allowed to start in Cooling
Heating: Unit is allowed to start in Heating
3.7.3 - Volt-free setpoint selection contact
When the unit is under remote control, the volt-free contact
is used to determine the active setpoint. This dry contact is
used to switch between setpoints. It is active only when the
control is in Remote mode. See also section 8.5.1.
Contact
Active setpoint
SP1 SP2 SP3 Auto
SETP_SW1 open close open close
SETP_SW2 open open close close
3.7.4 - Volt-free demand limit selection contact
One dry contact can be used to limit unit capacity. The limit
menu (see section 5.6).
100% Limit 1 Limit 2 Limit 3
Demand limit 1 contact open closed open closed
3.7.5 - Summer switch (HDC option)
For units with HDC option, the summer switch can be used
to control with the volt-free contact.
Summer switch Summer mode
open not active
closed active
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