Heating-Cooling - Johnson Controls T28 Installation Instructions

Wiring
Make wiring connections using wire nuts or other
approved solderless connectors. See wiring diagrams
for proper connections.
!
WARNING: Risk of Electrical Shock.
Disconnect the electrical power supply before
making the wiring connections to avoid possible
electrical shock or damage to the equipment. On
multiple circuit units, more than one circuit may have
to be disconnected.
Cooling
HI
LO
Off
Orange (hot) to L
Figure 4: T28BD Cooling Thermostat with
"Off-HI-MED-LO" Fan Switch

Heating-Cooling

HI
LO
Off
Orange
(hot) to L
Figure 5: T28CD Heating-Cooling Thermostat with
"Off-HI-MED-LO" Fan Switch
Sequenced Heating-Cooling
Note: Sequenced heating-cooling models have a
deadband allowing automatic changeover on
three-pipe or four-pipe systems.
Yellow
Tan to Fan
Blue
h
Red to
Cooling
1
Yellow
Tan to Fan
Blue
h
Red to
Brown Cooling
to Heating
1
No Fan Selector
HEATING - COOLING
h
Figure 6: T28DA Sequenced Heating-Cooling
Thermostat
Fan "OFF" Closes Cooling Valve
Off
On
Orange
(hot) to L
Figure 7: T28DB Sequenced Heating-Cooling
Thermostat with "Off-On" Fan Switch
HI
LO
Off
On
Orange
(hot) to L
Note: Fan "OFF" Closes Heating
and Cooling Valves
Figure 8: T28DD Sequenced Heating-Cooling
Thermostat with "Off-HI-MED-LO" Fan Switch
HI
LO
Off
On
Orange
(hot) to L
Figure 9: T28DG Sequenced Heating-Cooling
Thermostat with "Off-HI-MED-LO" Fan Switch
T28 Fan Coil Thermostat Installation Instructions
Brown to Heating
Orange (hot) to L
1
Red to Cooling
Blue to Fan
h
Red to
Cooling
Brown
to Heating
1
Yellow
Tan to Fan
Blue
h
Red to
Cooling
Brown
to Heating
1
Yellow
Tan to Fan
Blue
h
Red to
Cooling
Brown
to Heating
1
3