Basic Heating Airflow For Variable & Fixed Speed; Basic Cooling / Heat Pump Airflow For Variable & Fixed Speed; Refrigerant Charging - Nordyne B6VM Series Installation Instructions Manual

change speeds during start-up, shut down, when thermostat
inputs change, and when the duct static pressure changes
(vents closed or opened, filter clogging, etc.). The air handler
is configured by setting the selector switches and removing
jumper connectors.
Basic Heating Airflow for Variable & Fixed Speed
Fixed & variable speed motor control boards
27) & Figure 18) contain a set of dip switches for setting
the blower speed. For B6EM models, pins 1-4 set the speed
for heating. For B6VM models, the A/B switch must be set for
the appropriate cabinet size (either setting can be used for
C-size cabinets). The airflow is set automatically based on
the amount of installed heat. To determine the appropriate
switch settings for your installation, see
Table 7, (page 19), or Table 9, (page
Basic Cooling / Heat Pump Airflow for Variable & Fixed
Speed
The basic cooling/heat-pump airflow is controlled by setting
switches 5 - 8 on the motor control board (mounted on the
blower). All airflows for other modes of operation (except
electric heat) are determined by this basic setting. FAN ONLY
would deliver 50% of the selected cooling airflow.
(page 19) lists the basic airflow values versus the airflow
selector switch settings and ranges of basic air flow settings
recommended for each nominal system capacity.
• When operating in the heat pump mode, a higher basic
airflow setting will increase the energy efficiency and
capacity but will also decrease the supply air temperature.
• For maximum capacity and energy efficiency, select an
airflow at or near the top of the range for that nominal
capacity. See Table 8, (page
• For maximum dehumidification, select an airflow near the
middle or bottom of the range for that nominal capacity.
Additional information on humidity control can be found
in the Dehumidication Options section on
• For thermostats with a dehumidifier output, use a field
supplied wire to connect the thermostat's dehumidifier
output to the terminal marked DHuM. The thermostat
should be set so that the DHuM output should be high
(energized) when dehumidification is needed. See also
Dehumidification Options section.
IMPoRtANt! If coil icing is observed, the basic cooling/
heat-pump airflow selected may be too low. Verify the setting
selected is within the range shown in
system is properly charged. Please refer to the instructions
supplied with the outdoor unit. If icing continues to occur,
raise the selected airflow one or two steps.
NotE: Variable speed air handlers with SEER ratings higher
than 15 are matched with a 2-stage cooling outdoor unit.
They are programmed to operate at 75% of the selected
airflow while the system is in the lo-cool mode and 100% of
the selected airflow while in hi-cool mode.
(Figure 17 (page
Table 6, (page 18),
20).
Table 8,
19).
page 11.
Table 8 and that the the

REFRIGERANt cHARGING

WARNING:
the evaporator coil is shipped from the factory
with a nitrogen charge. use caution when
preparing coils for field connections. If repairs
make it necessary for evacuation and charging,
it should only be attempted by qualified,
trained personnel thoroughly familiar with this
equipment. Some local codes require licensed
installation service personnel to service this
type of equipment. under no circumstances
should the equipment owner attempt to install
and/or service this equipment. Failure to comply
with this warning could result in equipment
damage, personal injury, or death.
The system refrigerant charge can be checked and adjusted
through the service ports provided at the front panel of the
outdoor unit. Use only gauge lines which have a Schrader
depression device present to actuate the valve.
NITROGEN
1
HEALTH
0
FLAMMABILITY
0
REACTIVITY
0 Minimal Hazard 1 Slight Hazard
13