Airease 95G2UHV, Installation Instructions Manual

Page: 41 / 62

506878-01 Page 41 of 62 Issue 1139
Single Stage Thermostat Operation
(A95UH2V and 95G2UHV Models )
The automatic heat staging option allows a single stage
thermostat to be used with two stage furnace models
(A95UH2V or 95G2UHV). To activate this option, move the
jumper pin (see Figure 53) to desired setting (5 minutes or
10 minutes). The furnace will start on 1st stage heat and
stay at 1st stage heat for the duration of the selected time
before switching to 2nd stage heat.
W1 on the control board must be connected to W1 on the
thermostat.
Humidifier
Terminals are provided on the integrated ignition/blower
control board for connection to a 120-volt humidifier. The
“HUM” terminal is energized whenever the thermostat calls
for heat. See the furnace wiring diagram for specific
connection information.
Electronic Air Cleaner
Terminals are provided on the integrated ignition/blower
control board for connection of a 120-volt electronic air
cleaner. The “EAC” terminal is energized whenever the
thermostat calls for heat, cooling, or continuous blower. See
furnace wiring diagram for specific connection information.
Variable Speed Features
This furnace is equipped with a variable speed circulation
air blower motor that will deliver a constant airflow within a
wide range of external static pressures. Other features of
this variable speed motor include:
Soft Start
The variable speed motor will slowly ramp up to normal
operating speed. This minimizes noise and increases
comfort by eliminating the initial blasts of air encountered
with standard motors.
Soft Stop
At the end of a cooling or heating cycle, the variable speed
motor will slowly ramp down after a short blower “off” delay.
If continuous blower operation has been selected, the
variable speed motor will slowly ramp down until it reaches
the airflow for that mode.
Passive and Active Dehumidification
Passive Dehumidification
For situations where humidity control is a problem, a
dehumidification feature has been built into the variable
speed motor. At the start of each cooling cycle, the variable
speed motor will run at 82% of the rated airflow for 7.5
minutes. After 7.5 minutes has elapsed, the motor will
increase to 100% of the rated airflow.
Active Dehumidification
To achieve additional dehumidification, clip the jumper wire
located below the DEHUM terminal on the integrated ignition/
blower control board and connect a humidity control that
opens on humidity rise to the DEHUM and R terminals. The
DEHUM terminal on the control board must be connected
to the normally closed contact of the humidity control so that
the board senses an open circuit on high humidity. In this
setup, the variable speed motor will operate at a 30%
reduction in the normal cooling airflow rate when there is a
call for dehumidification.
Both the passive and active dehumidification methods
described above can be utilized on the same furnace.
Circulating Airflow Adjustments
Cooling Mode
The units are factory set for the highest airflow for each model.
Adjustments can be made to the cooling airflow by
repositioning the jumper plug marked COOL – A, B, C, D
(see Figure 54). To determine what CFM the motor is
delivering at any time, count the number of times the amber
LED on the control board flashes. Each flash signifies 200
CFM; count the flashes and multiply by 200 to determine the
actual CFM delivered (for example: 5 flashes x 200 = 1000
CFM).
Heating Mode
These units are factory set to run at the middle of the heating
rise range as shown on the unit rating plate. If higher or
lower rise is desired, reposition the jumper plug marked
HEAT - A, B, C, C (see Figure 54) . To determine what CFM
the motor is delivering at any time, count the number of times
the amber LED on the control board flashes. Each flash
signifies 200 CFM; count the flashes and multiply by 200 to
determine the actual CFM delivered (for example: 5 flashes x
200= 1000
.
AUTOMATIC HEAT STAGING JUMPER
Figure 53