Actuators; Terminal Block Connections - Carrier Touch Pilot Control Series Control Manual

4 - HARDWARE DESCRIPTION

4.6 - 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.
■ Staging valve: The staging valve is used during the start of
the compressor to route its flow through a bypass and to enable
the compressor start in proper conditions.
■ Evaporator flow switch: A flow switch is mounted to ensure
that the minimum flow rate required for the correct operation and
protection of the system is maintained. If the flow switch fails, the
alarm condition shuts off the unit. The flow switch can also be
added in the condenser exchanger (not provided with the unit).
■ Variable-speed water pumps: The controller provides a
command of speed for the evaporator water loop. The water
flow control is based on the heat exchanger temperature
difference.
■ Water pumps (optional): The unit can be fitted with one
evaporator and one condenser pump. The controller can
independently regulate each water heat exchanger pump.

Terminal block connections

Description
On/Off switch
Heat/Cool Switch
Demand Limit Switch #1
Customer interlock
Setpoint Switch
Setpoint reset
Alarm relay *
Running Relay
External Pump Speed Command
of the evaporator
3-way valve control
Occupied Override Switch
Demand Limit Switch #2
Ice setpoint
Condenser flow switch
Space temperature for reset
control
Capacity limit control
Chiller Alert state *
Chiller shutdown state *
Chiller capacity running output
(0 to 10V)
* These signals can be reversed by setting the parameter al_rever to "yes" in the GEN_CONF table.
8
Board Connector
SIOB #1 DI-01, 32-33
SIOB #1 DI-02, 63-64
SIOB #1 DI-03, 73-74
DI-04, 34-35
SIOB #1
- Bypass
SIOB #1 DI-05, 65-66
SIOB #1 AI-10, 71-72
SIOB #1 DO-05, 30A-31A
SIOB #1 DO-06, 37-38
SIOB #1 AO-01, 90+ 90 -
AUX1 #1 Ch 9, 80+ 80-
SIOB #3 DI-01, 77-78
SIOB #3 DI-02, 73A-74A
SIOB #3 DI-03, 75-76
DI-05, 96-97
SIOB #3
- Bypass
SIOB #3 AI-01, 71A-72A
SIOB #3 AI-10, 67-68
SIOB #3 DO-05, 30B-31B
SIOB #3 DO-06, 30-31
SIOB #3 AO-01, 79+ 79-
4.7 - Terminal block connections
The "Terminal block connections" table given below summarizes
connections at the user terminal block. Connections available at
the user terminal block may vary depending on the selected options.
IMPORTANT: Some contacts can be accessed only when the
unit operates in Remote mode.
4.7.1 - Volt-free contact (on/off and cool/heat)
Contact
On/Off switch
Heat/Cool switch
4.7.2 - Volt-free setpoint selection contact
When the unit is under remote control, the volt-free contact is used
to determine the active setpoint. This dry contact is used to switch
between setpoints.
Contact Setpoint 1
Setpoint switch open
* Ice done contact must be open to enable "setpoint 3"
4.7.3 - Volt-free demand limit selection contact
Two dry contacts can be used to limit unit capacity.
Contact 100%
Demand limit switch #1 open
Demand limit switch #2 open
Remarks
Used for the unit on/off control (Remote mode only):
open = unit is Off
closed = unit is on
Used to switch between heating and cooling (Remote mode only)
Used to control demand limit:
open = 100% capacity can be used, no demand limitation is applied
closed = demand limitation applied
Used to control unit start/stop:
open = unit shuts down
closed = unit is allowed to operate
When the unit is under remote control, the volt-free contact is used to
determine the active setpoint (see section 8.4.1)
4-20 mA signal to offset the active setpoint of the unit
Used to signal an alarm:
open = inactive (no alarms active)
closed = alarm(s) active
Used to signal a running status (at least one compressor start)
Used to control the speed of a pump by a 0-10V signal
Used to control a three way valve on the condenser water loop (optional)
In Remote mode closing this switch set occupancy to "yes"
In remote mode enables the 2nd capacity limit setpoint
Closing this input disables the ice setpoint
Used to detect the flow on the condenser side. It should be closed to
authorise the unit to start
Space temperature for reset control
4-20 mA signal to set the demand limit of the unit
Closed if an alert is present
Closed if chiller is shutdown
Used to transmit the voltage level corresponding to unit production
(10V = production at full capacity)
Off Cooling Heating
open closed closed
open open closed
Setpoint 2 Setpoint 3
closed closed
Limit 1 Limit 2
[lim_sp1] [lim_sp2]
closed open
open closed
Limit 3
[lim_sp3]
closed
closed