7
Motor temperature sensor
This sensor is used to control the motor temperature of each
compressor.
Temperature setpoint reset sensor (EMM)
This 4-20 mA space temperature sensor can be installed
remotely from the unit. It is used to reset the setpoint on the
unit.
Master/slave water sensor (optional)
assembly control.
3.7 - Actuators
Water pumps
The controller can regulate one condenser pump as well as
Electronic Expansion Valve
controlled linear stepper motor. The high degree of accuracy
Water ow switch
made automatically at the start-up. If the measured water
rate, the alarm condition shuts off the unit.
3.8 - Connections at the customer terminal block
depending on the selected options.
IMPORTANT: Some contacts can be accessed only when
the unit operates in Remote mode.
3.8.1 - Terminal block connections
The following table summarizes connections at the user
terminal block.
Description Board Connector Remarks
Remote on/o contact SIOB, cir A DI-01; 32-33 Used for the unit on/o control if the unit is in Remote mode
Remote setpoint contact SIOB, cir A DI-02; 65-66 Used to control the setpoint
Demand limit contact SIOB, cir A DI-03; 63-64 Used to control demand limit
Remote heat/cool contact SIOB, cir A DI-04; 73-74 Used to select heat/cool mode
Alarm relay SIOB, cir A DO-05; 30A-31A Indicates alarms
Running relay SIOB, cir A DO-06; 37-38 Indicates if the unit is ready to start or operating
Occupancy override SIOB, EMM DI-01; 77-78 Enables to switch between occupied (closed contact) and unoccupied
mode (open contact)
Demand limit contact 2 SIOB, EMM DI-02; 73A-74A Used to control demand limit
Customer interlock SIOB, EMM DI-03; 34A-35A Used for the customer safety loops
Ice done contact SIOB, EMM DI-04; 75-76 Used for ice storage control
Unit partially shutdown SIOB, EMM DO-05; 30B-31B Indicates the shutdown of one of the circuits
Unit shut down SIOB, EMM DO-06; 30-31 Indicates the unit shutdown
3.8.2 - Volt-free contact (on/off and cooling/heating)
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
3.8.3 - Volt-free setpoint selection contact
used to switch between setpoints.
Setpoint
contact
Active setpoint
Cooling Heating
CSP1 CSP2 HSP1 HSP2
SP_SW open close open close
csp = cooling setpoint
hsp = heating setpoint
3.8.4 - Volt-free demand limit selection contact
Up to two dry contacts can be used to limit unit capacity
(LIM_SW1 and LIM_SW2). The second contact (LIM_SW2)
module (EMM).
Capacity limitation with two contacts is as follows:
100% Limit 1 Limit 2 Limit 3
Demand limit 1 contact
(LIM_SW1)
open closed open closed
Demand limit 2 contact
(LIM_SW2)
open open closed closed
3.8.5 - Ice storage (EMM)
For units with EMM option, the control includes an additional
setpoint (“ice setpoint”) used for ice storage control.
Cooling setpoint
CSP1 CSP2 ICE_STP
Occupancy schedule occupied unoccupied unoccupied
Ice done switch open/closed closed open
csp = cooling setpoint
ice_stp = ice setpoint
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