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9
WIRING
DIAGRAM (US4020)
US4020/US4120
Figure 1c
1
For communication wiring, use 3-con-
ductor, twisted/shielded 22 AWG.
4
Dry contact. Must not be powered.
2
Control signals may be up to nominal
28 VAC from equipment transformer.
5
For sensor input wiring, use 2-conductor,
twisted/shielded 18 AWG.
3
24 VAC transformer. See powering
instructions
9
Unused terminal on this model.
