Airease 95G2UHV, Installation Instructions Manual

Page: 44 / 62

506878-01 Page 44 of 62 Issue 1139
Connect the desired speed tap to the “EAC” terminal and the
neutral tap to the neutral terminal on the ignition control (refer
to the furnace wiring diagram). The ignition control will control
the motor’s operation, including a nominal 20 second “on” delay
with a call for heat and a nominal 180 second “off” delay when
the thermostat is satisfied. It will also operate the motor on a
call for cooling, with no “on” or “off” delays.
Verify that the unit is operating at the desired speed and
within the rise range as shown on the unit rating plate.
The correct replacement motor must be installed as
soon as possible to ensure continued satisfactory
operation of the furnace.
Control Diagnostics
Troubleshooting
Make the following visual checks before troubleshooting:
1. Check to see that the power to the furnace and the
integrated ignition/blower control board is ON.
2. The manual shutoff valves in the gas line to the furnace
must be open.
3. Make sure all wiring connections are secure.
4. Review the Sequence of Operation.
Start the system by setting thermostat above room
temperature. Observe system response. Then use the
information provided in this section to check the system
operation.
The furnace has a built-in, self-diagnostic capability. If a
system problem occurs, a fault code is shown by a red LED
on the control board. The control continuously monitors its
own operation and the operation of the system. If a failure
occurs, the LED will indicate the failure code. The flash
codes are presented in Table 10.
Fault Code History Button
The control stores the last five fault codes in memory. A
pushbutton switch is located on the control. When the
pushbutton switch is pressed and released, the control
flashes the stored fault codes. The most recent fault code
is flashed first; the oldest fault code is flashed last. To clear
the fault code history, press and hold the pushbutton switch
in for more than 5 seconds before releasing.
FAILURE CODES - Red LED
Table 10
LED Status Fault Description
LED Off
LED On
1 Flash Flame Present with gas valve off
2 Flashes
Pressure switch closed with
inducer off
Normal operation
No power to control or control
hardware fault detected
3 Flashes
Low-fire pressure, rollout, or aux
limit switch open
4 Flashes
High limit switch open
5 Flashes Not used
6 Flashes Pressure switch cycle lockout
7 Flashes Lockout due to no ignition
8 Flashes
Lockout due to too many flame
dropouts
9 Flashes Incorrect polarity and phasing
HIGH HEAT STATE - Green LED
Table 11
LED
Status
Description
LED Off
LED On
LED Flashing
No demand for high heat
High heat demand, operating
normally
High heat demand, high pressure
switch not closed