10
OPTIONAL HUMIDISTAT
The optional humidistat may be installed in the
return air duct to provide excellent humidity
control when needed and maximum system
capacity and energy effi ciency when humidity
levels are normal. The humidistat senses when
humidity in the return air stream is above a preset
level (fi eld adjustable) and sends a signal to the
motor to reduce the airfl ow so that more moisture
may be removed until the humidity level drops. The
packaged heat pump unit is pre-programmed for
humidistat operation. Remove jumper connector
installed between the two terminals marked
“HUM” on the circuit board.
Installation—
Install the humidistat in the return
air duct as directed in the installation instructions
included with the kit. Wire the humidistat through
the low-voltage wire entrance in the packaged
heat pump unit to the quick-connect terminals
marked “HUM”. Wire the humidistat to open on
rise in humidity.
OPTIONAL BONNET
CONTROL SWITCH
The optional bonnet control switch and relay
is recommended in variable speed heat-pump
systems where supply air temperatures may
drop below a comfortable level during normal
operation. The bonnet control switch senses
when the supply air temperature is below a
preset comfort level (set by installer) and sends
a signal to the motor to reduce the airfl ow. The
supply air temperature increases when the airfl ow
is reduced. Airfl ow will resume to normal levels if
electric strip heat is energized. The air handler is
pre-programmed to accept bonnet switch inputs.
Remove jumper connector installed between “B1”
and “B2” on the circuit board. The bonnet switch
will not affect the cooling cycle.
Installation
— Install the bonnet control switch in
the supply air duct as directed in the installation
instructions included with kit. Locate the bulb
close to the unit, but not within the sight of the
heating elements. Wire the bonnet control switch
to the circuit board and through the low-voltage
wire entrance in the packaged heat pump unit,
and remove jumper connector between “B1” and
“B2” wire switch to close on temperature rise. Set
the thermostat as desired near 105°F.
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.
Check all factory wiring per the unit wiring
diagram and inspect the factory wiring connec-
tions to be sure none loosened during shipping
or installation.
Low Voltage Connections
Room Thermostat —
Several options are
available for a room thermostat depending on
the accessories installed with the unit. Select a
thermostat which operates in conjunction with
the installed accessories. The thermostat should
be mounted about fi ve feet above the ground on
an inside wall. The thermostat should be kept
away from drafts, slamming doors, lamps, direct
sunlight, or in line with the supply air fl ow.
To install the thermostat:
1. Position the sub base on an inside wall and
mark the mounting holes and thermostat
cable openings.
2. Cut out the cable opening and route the
thermostat cable from the unit’s low voltage
compartment to the thermostat location.
The thermostat cable is supplied by the
installer.
3. Connect the cable leads to the sub base
or thermostat terminals and to the unit’s
low voltage pigtails as shown in
Figure 8
.
A system wiring diagram is also provided
on the inside of the control panel cover.
4. Secure sub base or thermostat to the
wall using screws provided with the
thermostat.
5. If sub base is used, install the correct
thermostat housing to sub base.
6. Refer to thermostat instruction sheet for
complete detailed mounting information.
Defrost Cycle Timer —
The defrost cycle timer
controls the time interval of the hot gas defrost
after the defrost sensor closes. It is located in
the lower left corner of the defrost control board
on the low voltage side of the control box. Three
interval settings are available: 30 minutes, 60
minutes, and 90 minutes. Time setting selection
is dependent on the climate where the unit is
being installed.
