Carrier 30XW - Connections at the User Terminal Block

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3.9 - Connections at the user terminal block
Connections available at the user terminal block may vary
depending on the selected options.
Terminal block connections
Description Board Input/Output
Connector Remarks
On/O switch SIOB, circuit A DI-01 J1 Used for the unit on/o control if the unit is in Remote mode
Second setpoint switch SIOB, circuit A DI-02 J1 The contact is taken into consideration if the unit is in Remote mode
Demand limit switch 1 SIOB, circuit A DI-03 J1 Used to control demand limit. See section 7.7
Heat cool select status SIOB, circuit A DI-04 J1 Used to select heat cool mode
Condenser ow status (30XW only) SIOB, circuit A DI-08 J1 Used to control the condenser status
Setpoint reset control SIOB, circuit A AI-10 J9 Allows the customer to reset the currently selected setpoint
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
Optional
Occupancy override SIOB, EMM DI-01 J1 Enables 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 7.7
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 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
Heat reclaim condenser ow status (30XA only) SIOB, Heat reclaim DI-01 J1 Used to verify the water ow on the condenser side
Heat reclaim enable switch (30XA only) SIOB, Heat reclaim DI-02 J1 Used to switch between air-condenser (open contact) and water
condenser (closed contact) in Remote mode
Free cooling disable switch (30XA only) SIOB, Free cooling DI-01 J1 Used to control free cooling when the unit is in Remote mode
3.9.2 - Volt-free contact on/off/cooling/heating
If the unit operates in Remote mode, on/off contacts and
heating/cooling contacts operate as follows:
Without multiplexing
 Cooling Heating
On/O contact open closed closed
Cooling/heating contact - open closed
With multiplexing
 Cooling Heating Auto
On/O contact open closed closed open
Cooling/heating contact open open closed closed
Legend:
1. O: Unit is stopped
2. Cooling: Unit is allowed to start in Cooling
3. Heating: Unit is allowed to start in Heating
4. Auto: Unit can run in Cooling or Heating in accordance with the changeover
values.
3.9.3 - 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.
Cooling Heating
Setpoint 1 Setpoint 2 Setpoint 1 Setpoint 2
Setpoint selection contact open closed open closed
3.9.1 - General description
Some contacts can be accessed only when the unit operates
in Remote mode.
The following table summarises the connections at the user
terminal block.
3.9.4 - 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 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
The limits are dened in the SETPOINT menu.