Heating Configuration; Heat Pump Defrost Mode; Checking Heat Anticipator Settings; Configuring The Variable Speed Blower - Nordyne iHybrid DF6SF Series Installation Instructions Manual

CoPPER WIRE SIZE — AWG
(1% VoltAGE DRoP)
SUPPlY WIRE lEnGtH-FEEt
200 150 100
6 8 10
4 6
4 6
4 4
3 4
3 4
2 3
2 3
2 3
1 2
notE: Wire Size based on N.E.C. for 60° type copper conductors.
Table 3. Copper Wire Size
terminal to energize the reversing valve coil in the cooling
mode of operation.

Heating Configuration

This furnace is factory configured for two stage heat pump
operation and as a 2 stage gas heating system when the
thermostat is set to the Emergency Heat position.

Heat Pump Defrost Mode

The Ignition/Blower Control board has an Automatic Heat
Staging jumper which can be repositioned to bring on the
second stage of gas heat after a pre-determined delay in
minutes that can be used to offset any cool air while the unit
may be in a prolonged defrost cycle. This feature should only
be used in applications where extreme outdoor coil icing
may occur. Reposition the automatic heat staging jumper
from factory setting "NONE" to 5 or 10 for the desired delay
in minutes before the gas furnace will automatically move
to high heat operation. See Figure 14 (page 30).

Checking Heat Anticipator Settings

• Add the current draw of the system components.
• Measure the current flow on the thermostat R-W circuit
after the circulating blower motor has started. Set the heat
anticipator according to the thermostat manufacturer's
instructions for heat anticipator settings.

Configuring the Variable Speed Blower

The variable speed blower has been designed to give
the installer maximum flexibility for optimizing system
performance, efficiency, and comfort. It is equipped with
a microprocessor-controlled variable speed motor that is
pre-programmed to deliver optimum airflow in a variety of
conditions and system configurations. Because the blower
can be configured in many ways, it is important to read and
follow all instructions carefully.
CAUtIon:
To avoid personal injury or property damage,
make certain that the motor leads cannot
come into contact with any uninsulated metal
components of the unit.
12
SUPPlY CIRCUIt
AMPACItY
50
14 15
8 12 20
8 10 25
6 10 30
6 8 35
6 8 40
4 6 45
4 6 50
4 6 55
3 4 60
OR
WIRE GAUGE WIRE lEnGtH (Ft) FRoM UnIt
22
20
18
16
Table 4. thermostat Wire Gauge
Before operation, the variable speed blower must be
configured to match the unit with the system, climatic
conditions, and other system options. With the blower
installed and configured properly, the furnace will gradually
change speed in response to changes in system variables
such as thermostat settings, duct static, filters, etc. The
variable speed blower is configured by setting the heat,
cool, and adjust jumpers located on the ignition control
board as described below. See Figure 14 (page 30).

Selecting Cooling Airflow

The cooling airflow is selected by setting the Cool and Adjust
jumpers on the ignition control board. Table 11 (page 27)
lists the recommended airflow values (CFM) and selector
tap settings for each nominal system capacity. All airflows
for other modes of operation (except secondary gas heat)
are determined by this basic setting. For maximum capacity,
generally, a selection at or near the top of the CFM range
for that nominal capacity is best.
notES:
• The CFM values listed in Table 11 are not dependent
on duct static pressure. The motor automatically
compensates (within the limits of the motor) for changes
in duct static pressure.
• If coil icing occurs, the basic cooling airflow selected
may be too low. Verify the selected setting is within the
range shown in Table 11 and the system is properly
charged. If icing continues, raise the selected airflow
to the next higher tap.
• For maximum dehumidification and energy efficiency,
select an airflow near the middle or bottom of the CFM
range for that nominal capacity.
• The 2-stage cooling feature of the unit requires
modulating the airflow. The unit will automatically adjust
the airflow to the appropriate rate when the unit capacity
changes.
Selecting Gas Heating Airflow
The heating airflow is selected by setting the heat jumper to
the desired tap (A,B,C, or D) located on the ignition control
board. Refer to Table 12 (page 27) and select a nominal
rise based on the furnace's nominal efficiency and firing
input. Follow across the table row to find the tap setting
and nominal air-flow. Verify the selected rise is within the
specification shown on the furnace rating label.
RECoMMEnDED MAXIMUM
to tHERMoStAt
45
70
115
180