9
Use a separate branch electrical circuit for this
unit. A means of electrical disconnect must be
located within sight of and readily accessibility
to the unit. Internally mounted circuit breakers
are available as field installed options. These
circuit breakers can be used as an electrical
disconnect.
Provide power supply (or supplies) for the unit in
accordance with the unit wiring diagram, and
the unit rating plate. Connect the line-voltage
leads to the corresponding terminals on the
contactor (or the circuit breaker when the field
installed circuit breaker kits are used) inside the
control compartment. Use only copper wire for
the line voltage power supply to this unit. Use
proper code agency listed conduit and a conduit
connector for connecting the supply wires to the
unit and for obtaining proper grounding.
Grounding may also be accomplished by using
the grounding lug provided in the control box.
!
WARNING:
The unit cabinet must have and
uninterrupted or unbroken electrical
ground to minimize personal injury if an
electrical fault should occur. This
ground may consist of electrical wire or
approved conduit when installed in
accordance with existing national or
local codes.
Blower Speed — The blower speed is preset at
the factory for operation at the same speed for
heating and cooling. For optimum system
performance and comfort, it may be necessary
to change the factory set speed. To change the
blower speed:
1. Disconnect all electrical power to the unit
and remove the service panel.
2. Cut the wire tie holding the motor lead
bundle. See Figure 9 for detailed
information on the appropriate model and
speed desired.
3. If the desired heating blower speed is
different than the cooling speed, remove
and discard the jumper wire between
terminals #6 and #4. on the blower relay.
Place the desired heating blower speed
lead on terminal #6 and the desired
cooling blower speed lead on terminal
#4 of the blower relay. Use another wire
tie (field supplied) to bundle the
remaining motor leads.
!
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
connections to be sure none loosened during
shipping or installation.
Low Voltage Connections
Room Thermostat — Several options are avail-
able for a room thermostat depending on the
accessories installed with the unit. The avail-
able thermostats recommended for use with the
Q4 units are listed with the accessories in Table
5. Select a thermostat which operates in con-
junction with the installed accessories. The
thermostat should be mounted about five feet
above the ground on an inside wall. The ther-
mostat should be kept away from drafts, slam-
ming doors, lamps, direct sunlight, or in line with
the supply air flow.
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 10. A
system wiring diagram is also provided on
the inside of the control panel cover and in
Figure 8 of these installation instructions.
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
