Actuators; Terminal Block Connections - Carrier Touch Pilot Junior Manual

4.7 - Actuators

Electronic expansion valve
The electronic expansion valve (EXV) is used to adjust the
refrigerant flow to changes in the operating conditions of
the machine. The high degree of accuracy with which the
piston is positioned provides precise control of the
refrigerant flow and suction superheat.
Water flow switch
For units without internal pumps, the water flow switch
configuration allows for the automatic control of the
minimum water flow setpoint of the water flow switch. The
configuration depends on the unit size and is made
automatically at the start-up. If the flow switch fails, the
alarm condition shuts off the unit.
Description
On/Off Switch
Second Setpoint Switch
Limit Switch #1
Limit Switch #2
Heat/Cool Select
Desuperheater Switch
power_input_stable
Water Pump #1
Water Pump #2
Running Relay
Alarm Relay
Limit Analog Signal
Electrical Heat Stage #1
Electrical Heat Stage #2
Electrical Heat Stage #3
Boiler or Electrical Heat Stage #4
4.8.1 - 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
On/Off contact
open
[ON_OFF_SW]
Cooling/heating contact open
[HC_SW]
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 auto changeover is enabled (Heat/Cool Select
[HC_SEL], GENUNIT), the operating mode is selected based on OAT.
8
Board Connector / Input / Output
SIOB #1 J1 / DI-01
SIOB #1 J1 / DI-02
SIOB #1 J1 / DI-03
SIOB #1 J1 / DI-04
SIOB #1 J3 / DI-06
SIOB #1 J3 / DI-07
SIOB #1 J3 / DI-08
SIOB #1 J6 / IN03-DO-03
SIOB #1 J6 / IN04-DO-04
SIOB #1 J23 / DO-05
SIOB #1 J22 / DO-06
SIOB #1 J9 / AI-10
SIOB #2 J6 / DO-03
SIOB #2 J6 / DO-04
SIOB #2 J23 / DO-05
SIOB #2 J22 / DO-06
Cooling Heating Auto
closed closed open
open closed closed
Water heat exchanger pumps (optional)
The controller can regulate one or two fixed speed or
variable speed water heat exchanger pumps and takes care
of the automatic changeover between these pumps (see
also section 8.5).
Four-way valve (heat pumps only)
The control actuates the four-way valve for cooling /
heating mode and defrosts sessions.

4.8 - 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 Remarks
Used for the unit on/off control (Remote mode)
32-33
65-66 Used to switch between setpoints See section 4.8.2
73-74 Used to control demand limit. See section 4.8.3
75-76 Used to control demand limit. See section 4.8.3
63-64 Used to switch between cooling and heating when the unit is in
Remote mode (Heat pumps only)
49-49A Heat recovery is allowed
-
- The control can regulate one or two evaporator pumps and
automatically change over between the two pumps
- The control can regulate one or two evaporator pumps and
automatically change over between the two pumps
37-38 Indicates if the unit is ready to start or operating
30-31 Indicates alarms
43-44 Used for Setpoint Reset
- Used to manage electric heating stage (1)
- Used to manage electric heating stage (2)
- Used to manage electric heating stage (3)
- Used to manage boiler heating or electric heating stage (4)
4.8.2 - 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.
Setpoint selection contact
[SP_SW]
4.8.3 - Volt-free demand limit selection contact
Three steps demand limit based on two dry contacts can be
used to limit unit capacity.
100%
Demand limit switch 1 open
[LIM_SW1]
Demand limit switch 2 open
[LIM_SW2]
Cooling Heating
Stp 1 Stp 2 Stp 1 Stp 2
open closed open closed
Limit 1 Limit 2
closed open
open closed
Limit 3
closed
closed