T7984 A,B,C ELECTRONIC MODULATING CONTROL THERMOSTATS
T7984A
Output 1 analog
2œ10V
Output 2
on/off
Mode input
jumper
Changeover input
for Out 1
Day/Night
mode (NSB)
Remote sensor
option
75°F setpoint
limit
Cooling and/or
heating
X
X
WIRING
To install a remote duct or room temperature sensor, adust DIP
the screw terminals and wire as shown.
switch S6 to 0 = off and wire as shown.
(If sensor is used, wire 1changeover sensor per
To reverse operation of output 1 to heating, install the
thermostat.)
changeover contact or the changeover sensor across
Fig. 2. T7984A Wiring
Input (2-10 Vdc)
24 Vac
Common
2-10 Vdc valve or VAV
analog actuator
Duct
or
Room
Not used
Remote
sensor input
(0 Vac)
Output 1
2-10 Vdc
Changeover
input for Out 1
Changeover
contact
OR
Changeover
sensor
24 Vac
Power supply
(0 Vac)
24 Vac Transformer
SEQUENCE
SETPOINT DIAL CENTERED
End
Heating mode
End
Opened
Cooling mode
Device
Device
changeover
100%
opened
opened
input active
10 Vdc
10 Vdc
50%
End
0%
Closed
End
Device
closed
closed
Device
Temperature increase
OUTPUT 1 ANALOG
Fig. 3. T7984A Sequence
DIP SWITCH SETTINGS
REMOTE SENSOR
MAIN SENSOR
S6
LOCAL INTERNAL
1
REMOTE SENSOR 0
<< Not used
ON = 1
OFF = 0 6 7 8
Fig. 4. T7984A Dip Switch Settings
95C-10815–2
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