York 251934-YTG-J-0910 manual ZJ/ZR/ZF180-300 Wiring Diagrams, ZJ180-300 Typical Control Diagram

W1

W2

1

Y1

Y2

Y3

Y4

G

R

C

3

RC

W1

W2

Y1

G

OCC

P

P1

Y2

X

R

SD

C

EXPANSION

BOARD

Smoke

Detector

SD

SD

24 VAC

4

OCC

5

X

TERMINAL

BLOCK

Y3

Y4

C

Class 2

1

2

3

4

5

Second stage heating not required on single stage heating units. Jumper is required if there is no Smoke Detector circuit. Jumper is required for any combination of R, RC, or RH.

OCC is an output from the thermostat to indicate the Occupied condition. X is an input to the thermostat to display Error Status conditions.