SERVICING
44
4. Provide a thermostat demand for high stage auxiliary
heat (W1 + W2). Measure the voltage between
circuits 1 and 3 at the on-board electric heat connector.
Measure the voltage between circuits 2 and 3 at the on-
board electric heat connector. Voltage should measure
24VAC. Replace control if no voltage is present.
The integrated air handler control has some on-board tools
that may be used to troubleshoot the network. These tools
are: red communications LED, green receive (Rx) LED,
and learn button. These are described below:
A. Red communications LED – Indicates the status of
the network. Refer to the Network Troubleshooting
Chart for the LED status and the corresponding
potential problem.
B.
Green receive LED – Indicates network traffic. Refer
to the Network Troubleshooting Chart for the LED
status and the corresponding potential problem.
C. Learn button – Used to reset the network. Depress
the button for approximately 2 seconds to reset the
network.
Voltages between the two data lines and between each
data line and common may be used to determine if the
network is operating properly.
Do the following to measure the voltages on the
communications data lines.
WARNING
Line voltage now present
Data Line Voltage Troubleshooting and
Bias Switches
Proper data voltage is essential to robust and reliable
communication on the
communicating
system. Any wiring
issues must be corrected for good communication.
• Poor wiring connections at the terminal blocks
• Low voltage wires that are shorted, grounded or
broken.
• Communicating wires that are not connected to the
proper terminals at the connector.
• 24 volt common outside and inside are not at the
same ground potential
• It is STRONGLY recommended that you do not
connect multiple wires into a single terminal on the
wiring connector.
• Wire nuts are recommended to connect multiple
wires to connector ensuring 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. One hundred feet is the
maximum length of wire between indoor and outdoor
units or between indoor unit and thermostat.
• When outdoor transformer is used and there at least
three thermostat wires running to the outdoor unit
use one of the extra wires to connect the two 24
volt commons together. This will ensure both 24 volt
commons are at the same ground potential.
• When outdoor transformer is used and there are
only two thermostat wires running to the outdoor
unit ground the 24 volt common “C” of the outdoor
transformer to a chassis ground (earth ground. This
is not as good as the third wire but it is better than
leaving the outdoor 24 volt common floating.
Electric Heater (Optional Item)
Optional electric heaters may be added, in the quantities
shown in the specifications section, to provide electric
resistance heating. Under no condition shall more heaters
than the quantity shown be installed.
The low voltage circuit in the air handler is factory wired
and terminates at the location provided for the electric
heater(s). A minimum of field wiring is required to complete
the installation.
Other components such as a Heating/Cooling Thermostat
and Outdoor Thermostats are available to complete the
installation.
The system CFM can be determined by measuring the
static pressure external to the unit. The installation manual
supplied with the blower coil, or the blower performance
table in the service manual, shows the CFM for the static
measured.
Alternately, the system CFM can be determined by
operating the electric heaters and indoor blower WITHOUT
having the compressor in operation. Measure the
temperature rise as close to the blower inlet and outlet as
possible.
If other than a 240V power supply is used, refer to the
BTUH CAPACITY CORRECTION FACTOR
chart below.
BTUH CAPACITY CORRECTION FACTOR
SUPPLY VOLTAGE
250
230
220
208
MULTIPLICATION FACTOR 1.08
.92
.84
.75
EXAMPLE:
Five (5) heaters provide 24.0 KW at the rated
240V. Our actual measured voltage is 220V, and our
measured temperature rise is 42°F. Find the actual CFM:
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