10
Earthed 24 V a.c.
3.4.14 - Connection to the CCN
An RS485 bus is used for connection to the CCN. The CCN
connector is located inside the control box on the right hand
side of the customer terminal block. It is a three-pin connector:
Pin 1: signal
Pin 2: ground
Pin 3: signal
3.4.15 - Heat reclaim condenser water valve connection
This output is used on air-cooled units with the heat reclaim
option. It delivers a 4-20 mA or 0-10 V d.c. signal, depending
on the configuration (which must be carried out by Carrier
Service).
Condenser water flow/thermostat box control contact
connection
0-10 Volt signal generator
NOTE: Setpoint reset and demand limit based on an external
0-10 V d.c. signal cannot be used at the same time. Reset takes
precedence over demand limit.
NOTE: If the source of the 0-10 V d.c. signal is a temperature
sensor with a 24 V a.c. supply, it is essential to connect the
power supply for this sensor to the earthed 24 V a.c. supply
(wires 11-12) and not to the floating 24 V a.c. supply for the
basic board.
3.4.12 - Condenser water valve control contacts
This output can be used on water-cooled units that have the
condenser water valve control option installed. It delivers a
4-20 mA or 0-10 V d.c. signal, depending on the configuration
(which must be carried out by Carrier Service).
Water valve connections
3.4.13 - 24 V a.c. contact
Terminals 11 and 12, located at the end of the customer terminal
block, deliver an earthed 24 V a.c. with a maximum 1 A current.
Earthed 24 V a.c. output
1 Condenser
2 Signal
3 Fuse
Condenser water flow/thermostat box control contact
3.4.11 - 0-10 V d.c. input for setpoint reset or demand limit
This 0-10 V d.c. input is used either to reset the setpoint or limit
demand on a unit (see configuration, section 4.2.10). This input
is active whatever the operating type of the unit. This 0-10 V
signal can be delivered by a customer-specific controller or by
a 0-10 V temperature sensor.
0-10 Volt signal connection
Heat reclaim condenser water flow control contact
connection
Heat reclaim condenser water flow control contact
1 Condenser
2 Signal
3 Fuse
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