Terminal Block Connections - Carrier SmartVu control Manual

3 - HARDWARE DESCRIPTION

3.8 - 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.
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
External Variable Speed Pump
Electrical Heat Stage #1
Electrical Heat Stage #2
Electrical Heat Stage #3
Boiler or Electrical Heat Stage #4 SIOB #2
NOTE: Please refer to the electrical scheme for more
information about electrical terminal identification.
3.8.1 - 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:
Contact
On/Off contact
[ON_OFF_SW]
Cooling/heating contact
[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)
Unit can run in Cooling or Heating in accordance with the changeover
Auto:
values. If the auto changeover is enabled (auto_sel, GENUNIT),
the operating mode is selected based on OAT.
8
Connector
Board
/ 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 #1 J10 / AO-01
SIOB #2 J6 / DO-03
SIOB #2 J6 / DO-04
SIOB #2 J23 / DO-05
J22 / DO-06
Off Cooling Heating
open closed closed
open open closed
Terminal Remarks
32-33 Used for the unit on/off control (Remote mode)
65-66 Used to switch between setpoints. See section 3.8.2
73-74 Used to control demand limit. See section 3.8.3
75-76 Used to control demand limit. See section 3.8.3
Used to switch between cooling and heating when the unit is in
63-64
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
The control can regulate the water flow via the external variable
-
speed pump (0-10 V)
- 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)
3.8.2 - 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.
Auto
Contact
open
Setpoint selection contact
[SP_SW]
closed
3.8.3 - Volt-free demand limit selection contact
Three demand limits based on two dry contacts can be used to
limit unit capacity.
Contact
Demand limit switch 1
[LIM_SW1]
Demand limit switch 2
[LIM_SW2]
NOTE: When Demand Limit Switch 1 is closed, then electric
heating stages are disabled.
Cooling Heating
Stp 1 Stp 2 Stp 1
open closed open
100% Limit 1 Limit 2
open closed open
open open closed
Stp 2
closed
Limit 3
closed
closed