Data Sheet for Product

11/12

Siemens Building Technologies Heat-pump controller for wall mounting ACR12.481 CE1N3577en

HVAC Products 27.05.2004

• The connecting wires inside the controller must be placed such that no pressure

will be exerted on components when the cover of the controller is closed

(also refer to Installation Instructions G3577).

• The outputs to the fan motor are micro interruptions only. This means, that in error

cases more than one output can be switched on at the same time. If this happens,

the short circuit current between two windings of the fan motor (and therefore two

outputs) can be essentially greater than the maximum allowed 10 A, due to the spe-

cial design of the fan motors. This short circuit current of two (or even three) wind-

ings is not protected by the fuse in the supply line of the controller. Therefore it must

be either clear (verified through tests) that the erroneous currents are below 10 A or

an (external) over-current protection must be installed in the connection lines of the

fan motor.

• If an electric heater is used, it must be protected against overheating by an inde-

pendent thermal switch or thermal fuse installed directly into the supply lines to the

heater (see also EN 60 335-2-73)

• The switching contacts for signal inputs must be suited for low power.

• The changeover inputs of different controllers must not be connected in parallel.

This means, one switching contact must be used per input. Remember that this in-

put is not isolated from 230V.

The controller is not approved for mounting on metallic surfaces unless the sur-

face is permanently connected to a protective earthing.

Safety instructions

The controller must be installed by the customer according to the safety regula-

tions VDE 0700 / EN 60 335-2-73.

If any safety device of the system is activated, the installation must be thoroughly

checked before the system is reset.

The controller may be opened only when separated from the mains supply.

Check the currents on the motor side when all 3 fan steps are supplied with 230 V

(maximum failure current). These currents must not be higher than the max. 10 A

the controller is designed for.

230V AC

3 speed fan motor

The currents of all three connections to the fan motor (measured with the current me-

ters A) must be below 10 A when they are connected simultaneously to 230V.

Important:

Safety check

Important

Important applica-

tion instruction: