3.6 - Terminal block connections
Connections available at the user terminal block may vary
depending on the selected options. The following table summarizes
the connections at the user terminal block.
IMPORTANT: Some contacts can be accessed only when the
unit operates in Remote mode.
Terminal block connections
Description Board Input/Output Connector Remarks
On/Off switch SIOB, circuit A DI-01 J1 Used for the unit on/off control (Remote mode)
Heat/Cool switch SIOB, circuit A DI-04 J1
Used to switch between cooling and heating when the unit is in Remote
mode (Heat pumps only)
Second setpoint switch SIOB, circuit A DI-02 J1 Used to switch between setpoints
Demand limit switch 1 SIOB, circuit A DI-03 J1 Used to control demand limit. See section 3.6.3
Alarm relay SIOB, circuit A DO-05 J23 Indicates alarms
Running relay SIOB, circuit A DO-06 J22 Indicates if the unit is ready to start or operating
Variable speed pump
command
SIOB, circuit A AO-01 J10 Used to manage the customer variable speed pump (0 to 10V)
Lock switch SIOB, circuit B DI-02 J1 Used for the customer safety loops
Customer pump 1 SIOB, circuit B DO-05 J23
The control can regulate one or two single speed evaporator pumps and
automatically change over between the two pumps
Customer pump 2 SIOB, circuit B DO-06 J22
The control can regulate one or two single speed evaporator pumps and
automatically change over between the two pumps
Optional
Setpoint reset control SIOB, circuit A AI-10 J9
Allows the user to reset the currently selected setpoint (only units with
optional EMM)
Desuperheater demand SIOB, circuit B DI-04 J1 Heat recovery is allowed
Occupancy override SIOB, EMM DI-01 J1
Used to switch between occupied (closed contact) and unoccupied mode
(open contact)
Demand limit switch 2 SIOB, EMM DI-02 J1 Used to control demand limit. See section 3.6.3
Customer interlock SIOB, EMM DI-03 J1 Used for the customer safety loops
Ice done contact SIOB, EMM DI-04 J1 Used to control the setpoint according to the occupancy schedule
Capacity limit control SIOB, EMM AI-10 J9 Used for capacity limitation
Chiller partially shutdown SIOB, EMM DO-05 J23 Indicates the shutdown of one of the circuits
Chiller totally shutdown SIOB, EMM DO-06 J22 Indicates the unit shutdown
Chiller capacity running
output (0 to 10 V)
SIOB, EMM AO-01 J10 Reports the capacity percentage of the unit
Desuperheater customer
pump
SIOB, EMM
DO-01 J2
The control can regulate a customer pump for heat recovery.
The connection has to be done between the pin DO-01 of connector J2
and the pin IN-01 of connector J4
IN-01 J4
Free Cooling disable switch SIOB, Free Cooling DI-01 J1
When the control is under remote operating type and this contact is
opened, free cooling is allowed
3.6.1 - Volt-free contact (on/off and cooling/heating)
For chillers with a boiler or heat pumps, on/off contacts and cooling/
heating contacts are as follows:
Contact Off Cooling Heating Auto
On/Off contact open closed closed open
Cooling/heating contact open open closed closed
Off: Unit is stopped
Cooling: Unit is allowed to start in Cooling
Heating: Unit is allowed to start in Heating (chiller with boiler control or heat pump)
Auto: Unit can run in Cooling or Heating in accordance with the changeover
values. If the automatic changeover is enabled (Heat/Cool Select, GENUNIT
– General Parameters), the operating mode is selected based on OAT.
3.6.2 - Volt-free setpoint selection contact
This dry contact input is used to switch between setpoints. It is
active only when the control is in Remote mode.
Contact
Cooling Heating
Stp 1 Stp 2 Auto Stp 1 Stp 2 Auto
Setpoint selection
contact
open closed - open closed -
3.6.3 - Volt-free demand limit selection contact
Up to two dry contacts can be used to limit unit capacity. Note that
the second contact is available only for units with the energy
management module.
Capacity limitation with two contacts is as follows:
Contact 100% Limit 1 Limit 2 Limit 3
Demand limit 1 contact open closed open closed
Demand limit 2 contact open open closed closed
3.6.4 - Ice storage (EMM option)
For units with EMM option, the control includes an additional
setpoint (Ice setpoint) used for ice storage control.
Contact
Cooling setpoint
CSP1 CSP2 ICE_STP
Occupancy schedule occupied unoccupied unoccupied
Ice done switch open/closed closed open
3 - HARDWARE
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