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2.6.2.
AC/HP size
Select System Size Installed
The factory setting for air conditioner or heat pump size is
the largest outdoor unit that can be used with the furnace.
Installer needs to select air conditioner or heat pump size to
ensure that airflow delivered falls within proper range for the
size unit installed.
The select pins are marked 036, 030, 024, 018 for furnace
equipped with ½ HP ECM motor and 060, 048, 042, 036 for
furnace equipped with 1.0 HP ECM motor. Refer to the unit
wiring diagram and select the pin for the outdoor unit size
being used (Refer to Figures 9 and 15).
2.6.3.
System type
Select System Type Installed AC or HP
The type of system must be selected:
1.
AC – Air Conditioner provides approximately 400 CFM
per ton for greater efficiency and humidity control with
the AC/HP CFM ADJUST set to the nominal (NOM) tap.
To achieve more or less than 400 CFM per ton, move
tap to (HI) or (LO) position respectively.
appropriate airflow tables for exact CFM setting.
2.
HP-COMFORT
–
Heat
approximately 350 CFM per ton for higher than normal
heating air delivery temperature.
3.
HP-EFF – Heat Pump Efficiency provides same airflow
for heating and cooling modes to increase overall HP
efficiency; approximately 400 CFM per ton with the
AC/HP CFM ADJUST set to the nominal (NOM) tap.
The factory setting is AC (Refer to Figures 9 and 15).
2.6.4.
AC/HP CFM adjust
Select Medium, Low, or High Airflow
To provide airflow at rates described above, the AC/HP
ADJUST select is factory set to the nominal (NOM) tap. The
adjust selections HI/LO will regulate airflow supplied for all
operational modes.
HI provides 10% airflow over nominal unit size selected and
LO provides 10% airflow below nominal unit size selected.
Adjust selection options are provided to adjust airflow
supplied to meet individual installation needs for such thins
as noise, comfort, and humidity removal. (Refer to Figures 9
and 15)
2.6.5.
ON/OFF delay
Select desired time delay profile
NOTE: Delay selections are active in cooling and heat pump
heating modes only. Electric heating modes have a one (1)
minute OFF delay at 50% airflow and zero (0) ON delay
programmed into the ECM motor that cannot be overridden.
Four (4) motor operation delay profiles are provided to
customize and enhance system operation. (Refer to Figures
9 and 15).
Selection options are:
1.
0/90: No ON delay and 90 second OFF delay at 100%
airflow (factory setting).
Refer to
Pump
Comfort
provides
2.
30/90: 30 second ON delay with no airflow and 90
second OFF delay at 100% airflow profile. Used when it
is desirable to allow system coils time to heat-up/cool-
down in conjunction with the airflow.
3.
0/0: No delay option. Used for servicing unit or when a
thermostat is utilized to perform delay functions.
4.
ENH: enhanced selection provides a 30 second ON
delay with no airflow followed by 150 seconds at 70%
airflow, and no OFF delay for added comfort.
profile will minimize cold blow in heat pump operation
and could enhance system efficiency.
2.6.6.
Continuous fan
NOTE: If installed with a two-stage outdoor unit, do not
select HI speed continuous fan. If HI is selected, low stage
compression will also run HI fan speed possibly resulting in
insufficient dehumidification.
Select desired fan speed when thermostat is set on
continuous fan. (Refer to Figures 9 and 15)
1.
LO speed – factory setting, 50% cooling mode airflow.
2.
MED speed – move connector to MED, 80% cooling
mode airflow.
3.
HI speed – move connector to HI, 100% cooling mode
airflow.
2.6.7.
Low-voltage circuit
Fusing and Reference
The low-voltage circuit is fused by a board-mounted 5-amp
automotive fuse placed in series with the transformer SEC2
and the R circuit.
referenced to chassis ground through a printed circuit run at
SEC1 connected to metal standoff marked with ground
symbol.
2.6.8.
Basic furnace configuration
The following basic configuration of the furnace will provide
ARI rated performance of an air conditioner:
1.
HEAT KW/CFM – Select the heater range for the size
electric heater installed.
2.
AC/HP SIZE – Select system size installed.
3.
SYSTEM TYPE – Select system type AC
4.
AC/HP CFM ADJUST – Select NOM.
5.
ON/OFF DELAY – Select 0/90 profile.
6.
CONTINUOUS FAN – Select desired fan speed when
thermostat is set to continuous fan.
The following basic configuration of the furnace will provide
ARI rated performance of a heat pump:
1.
HEAT KW/CFM – Select the heater range for the size
electric heater installed.
2.
AC/HP SIZE – Select system size installed.
3.
SYSTEM TYPE – Select system type HP-EFF
4.
AC/HP CFM ADJUST – Select NOM.
5.
ON/OFF DELAY – Select 0/90 profile.
6.
CONTINUOUS FAN – Select desired fan speed when
thermostat is set to continuous fan.
7
The C circuit of the transformer is
This
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