Water Flow Control Valves; Electrothermal Actuator (On/Off); Replacing Actuators; Electrical Circuit Diagrams For Actuators - Carrier 42BJ ICM Installation Manual

8 - WATER FLOW CONTROL VALVES

8.1 - Electrothermal actuator (on/off)

This on/off type actuator is used with a Carrier room
thermostat (electromechanical controller) and the Carrier
numeric controller.
NOTE:
The electrothermal actuator is delivered in the normally
closed position regardless of the two-way or three-way valve
body used (way A-AB closed in the case of a three-way
valve).
Therefore to enable the installation to be filled with water, the
water circuits to be equalised and the units to be purged, the
valves will have to be opened by sending a command from the
wall thermostats.

8.2 - Replacing actuators

The actuators on both the chilled water and the hot water
valves may be replaced if either develops a fault.
a) Disconnect the power supply to the unit before carrying out
any work on a unit.
b) Disconnect the actuator power supply cable.
• On/off type actuator used with a Carrier numeric controller:
Disconnect the quick connect power supply cable on the
actuator.
• On/off actuator used with a wall-mounted thermostat:
Remove the plastic protection cap (held in place with two
hexagon head (8 mm AF) screws). Disconnect the quick
connect power supply cable on the actuator. This can be done
by using a screwdriver to press down on the spring tongue and
pulling out the wire from the appropriate terminal.
c) Uncouple the faulty actuator. Reverse the removal
procedure described above when installing the replacement
motor.
WARNING:
Ensure that the actuator is firmly screwed to the valve body
(maximum torque 15 N/m).

8.3 - Electrical circuit diagrams for actuators

8.3.1 - Carrier numeric controller
NOTE:
For further information, please refer to the selection
manual, installation manual and start-up handbook for the
Carrier numeric controller.
8.3.2 - Electromechanical controller with fan speed
controller
4 pipes
Brown
FM
2 pipes changeover
Black
FM
Blue
Actuator for heating
water valve
Actuator for cooling
water valve
Brown
Blue
Red
Brown
Actuator for cooling
Change-Over
water valve
19