T7984 A,B,C ELECTRONIC MODULATING CONTROL THERMOSTATS

T7984C

Output 1 analog

2œ10V

Output 2

analog 2œ10V

Mode input

jumper

Changeover input

for Out 1

Day/Night

mode (NSB)

Remote sensor

option

75°F setpoint

limit

Cooling and

Heating

Heating only X X 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

Duct
or
Room
NSB contact
from a central timer NSB input
Remote
sensor input
(0 Vac)
Output 1
2-10 Vdc
Output 2
2-10 Vdc
Changeover
input for Out 1
24 Vac
Power supply
(0 Vac)
Changeover
contact OR Changeover
sensor
Input (2-10 Vdc)
24 Vac
Common
Input (2-10 Vdc)
24 Vac
Common
2-10 Vdc valve or VAV
analog actuator
24 Vac Transformer

Fig. 9. T7984C Wiring

SEQUENCE

SETPOINT DIAL DEFINITION SETPOINT DIAL DEFINITION
SETPOINT SETPOINT
HEATING COOLING HEATING COOLING
SETPOINT CENTERED SETPOINT SETPOINT CENTERED
End
End
Device
closed
2 Vdc
IN ZERO
ENERGY BAND
OUTPUT 2
ANALOG OUTPUT 1
ANALOG
SETPOINT
End IN ZERO End
End
Device
Device
100% ENERGY BAND 100% Device
Device
opened
10 Vdc
50%
End
Device
closed
0%
OUTPUT 2
ANALOG
2 Vdc
opened
10 Vdc opened
10 Vdc
opened
10 Vdc
50%
End
Device
closed
2 Vdc 0%
OUTPUT 1
ANALOG
End
Device
closed
2 Vdc
ZERO ENERGY BAND ZERO ENERGY BAND
Temperature increase Temperature increase

Fig. 10. T7984C Sequence

DIP SWITCH SETTING

DEFINITION S3 S4
75°F OVERRIDE 1 1
HEATING DIAL 0 1
COOLING DIAL 1 0
CENTERED HC 0 0
SETPOINT DIAL DEFINITION
ON = 1
HEAT SETBACK
10°F (5°C)
5°F (3°C)
COOL SETUP
20°F (10°C)
5°F (3°C)
S5
1
0
DAY/NIGHT SETBACK
ZERO ENERGY BAND
ZEB S2
5°F (3°C) 1
3°F (1.5°C) 0
REMOTE SENSOR
MAIN SENSOR S6
LOCAL INTERNAL 1
0
REMOTE SENSOR
OFF = 0 2 3 4 56

Fig. 11. T7984C Dip Switch Setting

95C-10815–2 6