Nordyne 460/575 Volt Single Package Convertible Air Conditioner User Manual And Installation Instructions page 8

Line Voltage — Before proceeding with the
electrical connections, make certain that the
voltage, frequency, and phase of the supply
source are the same as those specified on the
unit rating plate. Also verify that the service
provided by the utility is sufficient to handle the
additional load imposed by this equipment.
See the unit wiring label for proper high and low
voltage wiring. Make all electrical connections
in accordance with all applicable codes and
ordinances.
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. For maximum ampacity and over
current protection, see the unit rating plate.
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
3 Ton Blower Wiring
BR T( ) - Blower Relay Terminal (number)
TB T( ) - Terminal Block Terminal (number)
4 and 5 Ton Blower Wiring
BR T( ) - Blower Relay Terminal (number)
TB T( ) - Terminal Block Terminal (number)
8
Blower Leads Low
Red BR T3
Black TB T1
Gray TB T1
Blue ISOLATE
Violet ISOLATE ISOLATE ISOLATE
Blower Leads Low
Red BR T3
Black TB T2
Gray TB T2
Blue TB T1
Violet TB T1
Figure 7. Motor Lead Connections
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 medium speed.
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. Connect motor leads as shown in
Figure 7.
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.
Blower Speed
Medium High
ISOLATE ISOLATE
TB T1 BR T3
TB T1 ISOLATE
BR T3 ISOLATE
Blower Speed
Medium High
ISOLATE ISOLATE
TB T1 BR T3
TB T1 ISOLATE
BR T3 ISOLATE
ISOLATE ISOLATE