9
1.6
Control Circuit Connections
1.6.1
Control Circuit Wiring
Use a dedicated, earthed metal conduit for both the
control signal cable and the security circuit cables,
sharing the same conduit if practicable.
Use screened cable for all control and security circuit
connections to minimise risk of electrical interference.
The screen should be grounded at the VAPANET end
only. See detail on page
9.
1.6.2
On/Off Control
LFE models can be operated by a single step
humidistat which has Volt-free contacts.
Note: See 1.6.4 Control Signal Selection below.
1.6.3
Proportional Control
The VAPANET Electrode Boiler (LFE) models can all
be operated by either a potentiometric signal or by
one of the following standard proprietary DC analogue
signals.
Input signal:
Standard
On/Off
1
0-5 V dc
2
0-10 V dc
3
2-10 V dc
4
1-18 V dc
5
0-20 V dc
6
4-20 mA
7
Pot
Response:
20 -100%
NB. The control signal is connected to ground at
the PCB –
if the controller output is referenced to
ground, then the “leg” which is ground must be
the one linked to terminal 5.
5
6
8
9
10
10
9
8
6
5
5
6
8
9
10
- +
Proprietary
DC Analogue
Signal.
Potentiometric
Control
Hygrostat with
Volt Free contacts
Min. 135 Ohms
Max 10k Ohms
Max resistance of external
connection 100 Ohms.
NB
Terminal 5
is connected to
ground!
Summary of Contents for VapaNet LFE Series
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