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 4