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251934-YTG-J-0910
94 Johnson Controls Unitary Products
ZR180-300 Typical Control Diagram
THERMOSTAT
1
TERMINALS
( RCB )
REHEAT
CONTROL BOARD
RC
RH
Y1
Y2
W1
W2
G
C
X1
X3
X4
A1
A2
T
T
R
Y1
Y2
W1
W2
G
C
OCC
HUM
1
2
3
4
HUM
TERMINAL BLOCK
RH
3
2
1
Electronic programmable Thermostat 2ET0770010024
( includes subbase).
2
Terminals A1 and A2 provide a relay output to close the
outdoor economizer dampers when the thermostat
switches to the set-back position.
3
TO REMOTE SENSOR
2ET04701324 IF USED
DEHUMIDISTAT
Dehumidistat closes on rise in humidity.
RC
RH
Y1
Y2
G
W1
W2
C
C
W2
W1
G
Y2
Y1
R
OCC
( RCB )
REHEAT
CONTROL
BOARD
HUM
TERMINAL
BLOCK
RH
1
1
2
3
4
1
DEHUMIDISTAT
Dehumidistat closes on rise in humidity.
TYPICAL
THERMOSTAT