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Additional information on humidity control can be found
in the Humidistat and Delay Setting sections.
• 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
(positive) 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 Tables 7a or
7b (page 14) and that the the 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.
Dehumidification options
The motor control board (Figure 13, page 17) has a DHuM
connection that allows the system to increase the amount
of humidity that is removed from the circulating air. This
is accomplished by reducing the CFM and allowing the
cooling coil to become colder. This will only occur when
there is a call for cooling. There are many ways that this
can be electrically wired.
1. If the room thermostat incorporates a humidity sensor
and DHuM output, connect the DHuM on the thermostat
to the DHuM terminal on the motor control board. See
Figure 5.
2. If using a separate humidistat, connect the DHuM & R
terminals on the humidistat to the DHuM & R terminals
on the motor control board of the air handler. In this
option, the DHuM output of the humidistat must be set
to be normally open and closed when there is a call for
humidification.
3. If a humidistat is not available, it is an acceptable option
to connect the R & DHuM terminals on the motor
control board together with a field supplied wire. This
option causes the blower to run at a reduced CFM for
10 minutes after a call for cooling. NotE: If outdoor unit
is a heat pump, connect the o terminal to DHuM.
HUMIDISTAT
DHUM
R
Figure 5. DHuM Wiring configuration
cABINEt SIZE
A
B
C
table 3. Filter Sizes
Proper maintenance is most important to achieve the best
performance from a air handler. Some of the components
and their locations are shown in Figure 8 (page 12). If
any component of the air handler must be replaced, use
only factory authorized replacement parts specified in the
Replacement Parts List provided online.
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical power
• When servicing controls, label all wires prior
• These maintenance instructions are primarily intended
• Always reinstall the doors on the air handler after
• Verify that the thermostat is properly installed and is
• To achieve the best performance and minimize
Air Filter(s)
MOTOR
CONTROL BOARD
DHUM
R
B6BV series air handlers are not supplied with a single
air filter when shipped from the factory. It is recommended
that the filter be cleaned or replaced monthly. Newly built
FILtER SIZE
or recently renovated homes may require more frequent
12 x 20 x 1
changing until the construction dust has minimized. Filter
18 x 20 x 1
sizes shown in Table 3 are available at most local retailers.
20 x 20 x 1
Filters designed to remove smaller particles such as
pollen, may require additional maintenance.
uNIt MAINtENANcE
WARNING:
ELEctRIcAL SHocK, FIRE oR EXPLoSIoN
HAZARD
to air handler.
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
to assist qualified technicians experienced in the proper
maintenance and operation of this appliance.
servicing or cleaning/changing the filters. Do not operate
the air handler without all doors and covers in place.
not being affected by drafts or heat from lamps or other
appliances.
equipment failure, it is recommended that a yearly
maintenance checkup be performed. At a minimum,
this check should include the following items:
WARNING:
Never operate the air handler without a filter in
place. Dust and lint in the return air can build
up on internal components, resulting in loss of
efficiency, equipment damage, and possible fire.
11
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