9
System
System Operating
Mode
Airflow
Demand Source
Cooling
Heat Pump
Heat Pump Heating
Only
Heat Pump
HP + Electric Heat
Strips
> of Heat Pump or Air
Handler Demand
Electric Heat Strips
Only
Air Handler
Continuous Fan
Thermostat
Cooling
Heat Pump
Heat Pump Heating
Only
Heat Pump
Auxiliary Heating
Furnace
Continuous Fan
Thermostat
Heat Pump + Air
Handler
Heat Pump +
Furnace
For example, assume the system is a heat pump matched with an
air handler. With a call for low stage cooling, the heat pump will
calculate the system’s low stage cooling airflow demand. The
heat pump will then send a fan request along with the low stage
cooling airflow demand to the air handler. Once received, the air
handler will send the low stage cooling airflow demand to the
ECM motor. The ECM motor then delivers the low stage cooling
airflow. The table at right lists the nominal high and low stage
airflow for the ComfortNet™ heat pumps.
High
Low
High
Low
DZ16TC0241
800
600
800
600
DZ16TC0361
1200
800
1200
800
DZ16TC0481
1550
1100
1550
1100
DZ16TC0601
1800
1210
1800
1210
DZ18TC0241
850
550
850
550
DZ18TC0361
1250
850
1250
850
DZ18TC0481
1750
1210
1750
1210
DZ18TC0601
1750
1210
1750
1210
Models
Cooling
Heating
C
ONTROL
W
IRING
NOTE:
Refer to section
Electrical Connections - High Voltage
Connections
for 208/230 volt line connections to the air conditioner
or heat pump.
NOTE:
A removable plug connector is provided with the control
board
to make thermostat wire connections. This plug may be
removed, wire connections made to the plug, and replaced. It is
strongly
recommended that you do not connect multiple wires
into a single terminal. Wire nuts are recommended to ensure one
wire is used for each terminal. Failure to do so may result in
intermittent operation.
Typical 18 AWG thermostat wire may be used to wire the system
components. 150 feet is the maximum recommended length of
wire between indoor unit and outdoor unit, or between indoor
unit and thermostat.
When installed as a communicating system, only data lines 1 and
2 are required between the indoor and outdoor units.
R
C
G
Y
Optional
Optional
Optional if
feature
supported by
thermostat
INDOOR
BOARD TERMINAL
CONNECTIONS
OUTDOOR
BOARD TERMINAL
CONNECTIONS
OUTDOOR
TRANSFORMER
1
2
C
R
C
G
Y
1
2
C
L
EGACY
C
ONTROLS
W
IRING
The intergrated control board on this unit is factory-equipped
with a 4-pin connector for low voltage contols wiring for commu-
nicating systems. If the system is installed as a non-communicat-
ing (legacy) system, remove the 4-pin connector and disconnect
the transformer low voltage and line voltage wiring. Then, install
the 7-pin connector that is supplied in the literature/accessories
bag into the intergrated control board in the appropriate location
indicated by the color-coded labels found on both the control
board and pin connector plug.
R
C
G
O
R
C
G
O
R
C
G
O
1
2
System Wiring for legacy controls
C
OMFORT
N
ET
™ S
YSTEM
A
DVANCED
F
EATURES
The ComfortNet system permits access to additional system infor-
mation, advanced setup features, and advanced diagnostic/
troubleshooting features. See indoor equipment installation
manual for directions on how to access the menus.
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