4.7
Terminal block 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.
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
Alarm relay
SIOB, circuit A
DO-05
J23
Indicates alarms
Running relay
SIOB, circuit A
DO-06
J22
Used to signal a running status (at least one compressor started)
Desuperheater demand
SIOB, circuit B
DI-04
J1
Heat recovery is allowed
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 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 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
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
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 for ice storage in unoccupied mode
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
4 - HARDWARE
4.7.1 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:
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.
4.7.2 Volt-free setpoint selection contact
This dry contact is used to switch between setpoints. It is active
only when the control is in Remote mode.
Cooling
Heating
Stp1 Stp2 Auto Stp1 Stp2 Auto
Setpoint selection contact
open closed
-
open closed
-
4.7.3 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:
100% Limit 1 Limit 2 Limit 3
Demand limit 1 contact
open
closed
open
closed
Demand limit 2 contact
open
open
closed
closed
Please note that limit thresholds can be defined via the user
interface in the Setpoint menu (see section 7.1).
4.7.4 Ice storage (Energy Management Module)
For units with the optional Energy Management Module, 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
EN-9
AQUACIAT
POWER
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