Reznor P6SD (3ph) Unit Installation Manual - Manual (Page 11)

11
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 fi eld 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 an
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. See table 1 for
factory settings. To change the blower speed:
If Standard Motor:
1. Disconnect all electrical power to the
unit and remove the service panel.
2. Remove the motor lead from terminal #4 of
the blower relay. Cut the wire tie holding the
motor lead bundle. The motor leads are
color coded as shown in Figure 7.
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 (fi eld supplied) to bundle the remaining
motor leads.
If Fixed Torque Motor:
1. Disconnect all electrical power to the unit
and remove the blower panel.
2. Locate the orange and red wires terminated
to the blower motor. The orange wire controls
cooling operation while the red wire controls
heating operation.
3. Verify the required speed from the airfl ow
data found in table 1. Place appropriate wire
on the appropriate motor speed tap for the
required airfl ow point.
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.
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.
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 us-
ing 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.
Field Installed Electric Heat — This
Packaged Air Conditioner is designed to allow
optional electric heat to be fi eld installed as re-
quired by the building’s particular heating load.