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Dip switch position
0 to 135 Ω control signal
Modulating R oom T hermos tat
50
60
70
80
0 to 135 Ohms
90
50
60
70
80
90
Modulating S upply A ir C ontrol T hermos tat
0 to 135 Ohms
Dip switch position
4 to 20 mA control signal
Modulating S ignal F rom B A S S ys tem
4 to 20 mA
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
LIT-R820_REV2-E03
0 O hms = 0% capacity
135 Ohms = 100% capacity
L1
1
2
3
W
R
B
L2
L3
4 mA = 0% capacity
20 mA = 100% capacity
L1
1
2
3
-
+
L2
L3
2nd S S R
on 3 phas e
models only
2nd S S R
on 3 pha se
models only
4
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