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Dip switch position
0 to 135 Ω control signal
Modulating Room Thermostat
5 0
6 0
7 0
8 0
0 to 135 Ohms
9 0
5 0
6 0
7 0
8 0
9 0
Modulating Supply Air Control Thermostat
0 to 135 Ohms
Dip switch position
4 to 20 mA control signal
Modulating Signal From BAS System
4 to 20 mA
24 VAC POWER & WIRING
•
It is not necessary to ground any leg of the transformer to earth with the controller card.
•
The controller uses internally a half wave rectifier bridge. On 0 to 10 Vdc control signal, the reference of the control signal is the
Common of the power supply of the SCR controller card.
•
Use a Class 1 ( properly fused ) or Class 2, CSA or UL recognized transformer.
Viconics Electronics Inc. 9245, Langelier Blvd, St-Leonard, Quebec, Canada H1P 3K9
0 To 135 Ω Room Or Duct Thermostat Control
S1
S2
S3
S4
On
On
Off
Off
4 To 20 mA From a Building Automation System
S1
S2
S3
S4
Off
Off
On
Off
L1
0 Ohms = 0% capacity
135 Ohms = 100% capacity
W
R
B
L2
L3
L1
4 mA = 0% capacity
20 mA = 100% capacity
-
+
L2
L3
LIT-R820X-E02
( controlled leg )
1
Common
2
24 Vac
3
Input
( controlled leg )
2nd SSR on 3 phase
models only
To load
( uncontrolled leg )
( controlled leg )
1
Common
2
24 Vac
3
Input
( controlled leg )
2nd SSR on 3 phase
models only
( uncontrolled leg )
www.viconics.com
sales@viconics.com
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