Thermostat Connector (E2)
•
R
– 24VAC from the indoor unit 24VAC transformer (40 VA minimum)
•
C
– 24VAC Common from the indoor unit 24VAC transformer
• 1-Data: System Communications Line 1
• 2-Data: System Communications Line 2
Low Volt Fuse
• If required replace with 3 A automotive ATC style blade fuse
Low Pressure Control (LPC Input)
• Low-pressure control is factory installed
• Low pressure control is an automatic resetting device
High Pressure Control (HPC Input)
• High-pressure control is factory installed
• High pressure control is an automatic resetting device
Ambient Temperature Sensor (included with all applications)
• Included with all applications
TEST and SW2 Buttons
• TEST and SW2 buttons used to enter Test and Fault Recall Mode
Memory Card
• The memory card stores all unit information.
• The unit information is called shared data.
• The shared data is all the information needed for proper unit operation.
11.2
Comfort Control
2
System™
Control Wiring
The
Comfort Control
2
System™
consists of:
• Serial communicating heat pump or condensing unit equipped with the
Comfort
Control
2
System™
• Air handler or furnace equipped with the
Comfort Control
2
System™
•
Comfort Control
2
thermostat
IMPORTANT:
If the installed system does not meet these requirements, the system
must be wired using traditional control wiring, reference Section 11.7 Conventional
24VAC Thermostat Control Wiring.
The
Comfort Control
2
System™
requires four (4) control wires for unit operation:
R – 24VAC
C – 24VAC common
1 – Data wire 1
2 – Data wire 2
Note:
Comfort Control
2
System™
requires 18 AWG thermostat wire.
Note:
Term dip switches should be in “ON” position.
If the low voltage control wiring is run in conduit with the power supply, Class I insu-
lation is required. Class II insulation is required if run separate. Low voltage wiring
may be run through the insulated bushing provided in the 7/8 hole in the base
panel, up to and attached to the pigtails from the bottom of the control box. Conduit
can be run to the base panel if desired by removing the insulated bushing.
The
Comfort Control
2
air handler or
Comfort Control
2
furnace transformer is
equipped with a 24 volt, 50 VA transformer for proper system operation. See the
wiring diagram in Figure 5 for reference. Use Table 5 to size the 24-volt control
wiring.
The four 18AWG low voltage control wires must be installed from the thermostat to
the indoor unit and from indoor unit to the outdoor unit. The wire length between the
thermostat and indoor unit should not be greater than 100 feet. The wire length
between the indoor unit and outdoor unit should not be greater than 125 feet.
11.3
Comfort Control
2
System™
ICC Control Operation
Installation Verification
• 24V AC power on R&C must be present at the ICC for it to operate
18
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R
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L
2
S
Y
S
T
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™
C
O
N
T
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