Carel plug-in User Manual download pdf (Page 29)

plug-in

Cod. +030221881 rel. 1.3 - 03/05/2006

A7: external alarm detection delay (multifunction input)

Sets the delay (in minutes) for detecting the external alarm when A4=1.

Def.: A7=0. Available on all models.

4.9 F = evaporator fan management parameters

alarm parameters type min max uom def

fans subject to the fan controller (0=no, 1=yes) C 0 1 flag 0

fan shut-down temperature (effective temperature °C - °F) F -50 +127 °C/°F 5

stop fan when compressor off (0=no, 1=yes) C 0 1 flag 1

stop fans for defrost (0=no, 1=yes) C 0 1 flag 1

post dripping off F 0 15 min 1

Tab. 4.9.1

F0: fans subject to the fan controller

The fans can be subject to the fan controller, which manages them according to the temperature measured by the defrost probe.

Alternatively, the fans are always on during a defrost (see parameter F3), with the possibility of switching them off when the

compressor is off (see parameter F2), during the dripping period (see parameter dd) and for a further post dripping period (see

parameter Fd). The values allowed for this parameter are:

F0=0 (=no). In this case the fans are not subject to the fan controller, and are always on, except for the limits set by F2, F3, Fd

and, if necessary, by dd.

F0=1 (=yes). The fans are subject to the fan controller (see parameter F1) and parameters F3 and Fd, which have priority over

the controller.

Remember that if there is a dripping period (parameter dd), the fans are off in any case.

Def.: F0=0, not subject to the fan controller. Available on PJ32C.

F1: fan shut-down temperature (parameter operative only if F0=1).

The controller activates the fans only when the temperature of the evaporator is lower than the value set for F1. F1 is the

effective (real) temperature and not the difference from the set point. Once off, the fans start again when the difference

between the probe and the set point is equal to +A0, where A0 is the fan control differential (see the figure below).

Temp.evapor.

Fig. 4.9.1

Def.: F1=5, as shown in the figure, the fans stay on until the evaporator temperature is less than 5°C. Available on PJ32C.

F2: stop fans with compressor off

Decides if the fans must be always on (excluding F3, dd and Fd) or only when the compressor is on.

F2=0 (= no): The fans are also on when the compressor is off

F2=1 (= yes): The fans are off when the compressor is off.

Def.: F2=1, fans off when the compressor is off. Available on PJ32C.

F3: stop fans for defrost

Decides if the fans must operate or not during defrost.

F3=0 (= no): the fans operate during the defrost.

F3=1 (= yes): the fans do not operate during the defrost.

Remember that during the dripping time, if featured, the fans are always off.

Def.: F3=1, evaporator fans off during defrost. Available on PJ32C.

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 55 56

No comments

Carel plug-in User Manual Page 29