Modulating Furnace With Communicating Ac Or Hp; Modulating Furnace With Communicating Thermostat And Non-Communicating Ac - Johnson Controls TP9C C Installation Manual

681292-UIM-A-0211
CONTROL WIRING USING COMMUNICATING
CONTROLS
Use the wiring diagram below to connect the furnace control, Communi-
cating Control (wall thermostat) and communicating outdoor unit. Be
sure that all of the "A" terminals are connected together, all of the "B"
terminals are connected together, all of the "GND" or "C" terminals are
connected together and all of the "R" terminals are connected together.
See Figure 19. When using a fully communicating system, the large
screw terminals (C, G, R, etc.) on the furnace control are not used. The
four small screw terminals in the terminal block on the end of the fur-
nace control should be used.
Touch Screen Modulating Furnace
Communicating control Communicating control
A+
R
C
B-
FIGURE 19: Modulating Furnace with Communicating AC or HP
Touch Screen Modulating Furnace
Communicating control Communicating control
A+
R
C
B-
FIGURE 20: Modulating Furnace with Communicating Thermostat and
Non-Communicating AC
14
Air Conditioner/Heat Pump
Communicating control
A+
A+
R
R
GND or C GND
B- B-
LO
COMP
HI
COMP
O
DHUM
Y1
Y/Y2
W
R
G
C
Non- Communicating
Air Conditioner
A+
R
GND or C
B-
LO
Y
COMP
HI
Y2
COMP
O R
DHUM C
Y1
Y/Y2
W
R
G
C
When connecting the Communicating Control (wall thermostat) and fur-
nace control to a non-communicating outdoor A/C or heat pump, use
the wiring diagram in Figure 20. The thermostat and furnace will be con-
nected exactly as shown above, but the conventional 24 volt R, C and
Y/Y2 terminals will be used to control the outdoor unit.
CONVENTIONAL LOW VOLTAGE CONTROL WIRING
CONNECTIONS
Install the field-supplied thermostat by following the instructions that
come with the thermostat. With the thermostat set in the OFF position
and the main electrical source disconnected, connect the thermostat
wiring from the wiring connections on the thermostat to the terminal
board on the ignition module, as shown in Figures 21-26. Electronic
thermostats may require the common wire to be connected. Apply
strain relief to thermostat wires passing through cabinet. If air condition-
ing equipment is installed, use thermostat wiring to connect the Y and C
terminals on the furnace control board to the proper wires on the con-
densing unit (unit outside).
Set the heat anticipator in the room thermostat to 0.1 amps. Setting
it lower will cause short cycles. Setting it higher will cause the room
temperature to exceed the set points.
Some electronic thermostats do not have adjustable heat anticipa-
tors. They should be set to six cycles per hour. Follow the thermo-
stat manufacturer's instructions.
The 24-volt, 40 VA transformer is sized for the furnace components
only, and should not be connected to power auxiliary devices such as
humidifiers, air cleaners, etc. The transformer may provide power for an
air conditioning unit contactor.
AIR CONDITIONER CONNECTIONS
This furnace may be used with single-stage or two-stage air condition-
ing units.
For Single-Stage A/C - Connect the low voltage wiring as shown in
Figure 21.
For Two-Stage A/C - Use a two-stage thermostat, connect the low volt-
age wiring as shown in Figure 22.
For Two-Stage A/C using a Single-Stage Thermostat - connect the
low voltage wiring as shown in Figure 23.
This furnace control board can control a two-stage A/C using only a sin-
gle-stage thermostat. In this case, the furnace control switches between
high cool and low cool based on the calculated cooling load.
Johnson Controls Unitary Products