VDH ALFANET 71 User Manual

1 Function
The ALFA(NET) 71 is a panel mount thermostat-unit. The thermostat has also three relays outputs
selectable for function cooling, heating or alarm. The temperature is measured by sensor-1 unless
sensor-2 is active as control sensor (P05=1), in this case the average temperature of both sensors
(SM 811 2-wire) is displayed and used for control.
The ALFANET 71 is provided with an RS-485 network connection allowing to read out and set this
unit on the ALFANET.
2 Installation
On the connection diagram of the ALFA(NET) 71 is shown how the sensor(s), power supply, relays,
and optional network should be connected. After connecting the ALFA(NET) 71 to the power supply,
a self-test program is started. As the test is finished the measured temperature appears in the
display.
3 Control
The ALFA(NET) 71 thermostat can be controlled by four pushbuttons on the front.
These keys are;
SET
8
∏ UP
π DOWN
°C STATUS
Description: Alfa(net) 71 12Vac 0/+100°C
Type: Manual
File: Do170982 ALFANET 71 0_+100°C Flash
V10 EN.docx
VDH Products BV
User manual
0/+100°C
- view / change the set value and reset alarm.
- increase the set value.
- decrease the set value.
- relay status key.
ALFA(NET) 71
Pages: 8
By: BVDB
Paraph:
Doc. No.: 170982
Version: 1.0
Date: 17-08-2017