T7984 A,B,C ELECTRONIC MODULATING CONTROL THERMOSTATS
T7984B
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 Heating Mode A (Jumper out) X X X
Heating Cooling Mode B (Jum per in)

WIRING

To install a remote duct or room temperature sensor, adjust * To enable mode B of operation, install a jumper across the
DIP switch S6 to 0 = off and wire as shown. screw terminals and wire as shown
Duct or NSB contact from a central timer

SEQUENCE

Mode A (jumper not installed)
Output 1 analog in cooling mode Output 2 on/off in heating mode Room Remote sensor input (0 Vac) NSB input SETPOINT DIAL DEFINITION
HEATING
End SETPOINT
SETPOINT
Device CENTERED
Output 2 On/off Output 1 2-10 Vdc Mode input 24 Vac Power supply (0 Vac)
Fig. 5. T7984B Wiring
on IN ZERO Device
100% ENERGY BAND opened
10 Vdc
50%
Device
Device closed
off 2 Vdc
0%
OUTPUT 2
ON/OFF OUTPUT 1
ANALOG
ZERO ENERGY BAND
Temperature increase
Fig. 6. T7984B Sequence (Mode A)

DIP SWITCH SETTINGS

DEFINITION S3 S4
75°F OVERRIDE 1 1
HEATING DIAL 0 1
COOLING DIAL 1 0
CENTERED HC 0 0
SETPOINT DIAL DEFINITION
ZEB S2
5°F (3°C)
3°F (1.5°C)
1
0
ZERO ENERGY BAND
CYCLES/HOUR S1
FAST 8 CPH 1
SLOW 4 CPH 0
OUTPUT 2 ON/OFF CPH
ON = 1
123 4 56
OFF = 0
COOLING
SETPOINT
End
Input (2-10 Vdc) 24 Vac Common 2-10 Vdc valve or VAV analog actuator 24 Vac on/off relay or valve 24 Vac Transformer

R

Mode B (jumper installed)
Output 1 analog in heating mode
Output 2 on/off in cooling mode SETPOINT DIAL DEFINITION
HEATING
Device
End SETPOINT
CENTERED
SETPOINT
opened IN ZERO Device
100% 10 Vdc ENERGY BAND on
50%
Device
closed Device
2 Vdc off
0%
OUTPUT 2
ON/OFF
ZERO ENERGY BAND
Temperature increase
OUTPUT 1
ANALOG
Fig. 7. T7984B Sequence (Mode B)
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
REMOTE SENSOR
MAIN SENSOR S6
LOCAL INTERNAL 1
0
REMOTE SENSOR
COOLING
SETPOINT
End
Fig. 8. T7984B Dip Switch Settings
5 95C-10815–2