1
User manual
ALFA 55 RTDF and
ALFANET 55 RTDF
Cool/Defrost
thermostat with
fan-control and
realtime defrost.
VDH doc. 030087
Version: v2.1
Date: 10-03-2008
SW: 992649_ALFA(NET) 55/65/75 RTDF
File: Do030087.wpd
Range: -50,0/+50,0
C pro 1
C
* Description.
The
ALFA(NET) 55 RTDF
is a cool/defrost thermostat for rail-mounting, with various defrost-, and fan-
control settings. The thermostat has 6 Real-Time DeFrost time settings a day available.
The
ALFA
NET
55 RTDF
has a RS 485 network connection so it can be read out and adjusted on the
Alfanet.
* Installation.
On the connection diagram of the
ALFA(NET) 55 RTDF
is shown how the sensor, power supply and
relays has to be connected.
After connecting the
ALFA(NET) 55 RTDF
to the power supply, a self test function is started. As this
test is finished, the measured temperature of the control-sensor appears in the display.
* Control.
The
ALFA(NET) 55 RTDF
thermostat can be controlled by four push buttons on the front. These keys
are:
SET
- view / change the setpoint.
UP
- increase value.
DOWN
- decrease value.
MODE
- relay status key.
* View setpoint.
By pushing the
SET
key the setpoint appears in the display. The decimal point of the last display starts
blinking to indicate this. After a few seconds after releasing the
SET
key the setpoint disappears and
the measured temperature is shown again.
* Changing setpoint.
Push the
SET
key and the setpoint appears in the display. Release the
SET
key. Now push the
SET
key again together with the
UP
or
DOWN
keys to change the setpoint. After a few seconds after
releasing the
SET
key the setpoint disappears and the measured temperature is shown again.
* Status of the Relays.
By pushing the
MODE
key, the display shows the status of the relays. Each display segment shows the
status of the relay output, showing =off,
=on and on the last segment=natural defrost active.
The code
means relay 1(compr.) and 2(fan) are on and relay 3(defr.) is off.
Содержание ALFANET 55 RTDF
Страница 6: ...6 Dimensions...
Страница 7: ...7 Connections...
