OSTBERG HERU 400-2400 S, User Manual

Page: 47 / 120

47 / 120
2018-02-13 Climatix HERU® 400-2400
External components basic unit
Damper motors
There are two different types of actuators for damper control.
-
Spring return (2-point)
- On/Off (3-point)
The On/Off actuator is only designed to be combined with electric air heater EHC.
If the air heater is a water heater, the system must be equipped with a spring-return
(2-point) actuator. If not, the coil and/or the fluid piping system can freeze. Natural
draught can occur in the ventilation ducts at the same time as frost protection
regulation with related circulation pumps is put out of operation due to power failure.
Connection of spring - return motor
54
Damper control
Outside/s upply
air
Red
Black
ST1
55
56
Damper control
Extract air
ST2
51
52
53
Red
Black
2-pos ition 24V AC
2-pos ition 24V
AC
If the damper motor turns the wrong way when HERU® CX is started, flip the damper
actuator.
993061001 Damper motor spring 24 VAC
Connection On/Off motor
54
Damper control
outside/Supply
air
Orange
Black
ST1
Violet
55
56
Damper control
Extract air
ST2
51
52
53
3-läges 24V AC
3-pos ition 24V AC
G0
Orange
Black
Violet
G0
If the damper motor is turned the wrong way when HERU® CX is started, switch
Violet/Orange.
ST1, ST2
Important!
Connection
Part no.:
Connection