Electrical Connections; System Operation - Nordyne R-410A User Manual And Installation Instructions

High Voltage
Low Voltage
Figure 9. Power Entry

ELECTRICAL CONNECTIONS

1. ELECTRICAL SERVICE
High Voltage
a. Install a branch circuit disconnect of ad-
equate size per NEC. Locate the disconnect
within sight of the unit.
b. Extend leads through power wiring hole
provided. Connect L1 and L2 directly to the
contactor. (See Figure 9).
c. Ground the air conditioning unit using the
green grounding screw provided in the
control panel.
Low Voltage
a. Route 24v control wires through the sealing
grommet near the power entrance.
b. Connect the control wires to the leads in
the low voltage area. (See Figure 10).
2. OVERCURRENT PROTECTION
In general, the best fuse or breaker for any air
conditioner is the smallest size that will permit
the equipment to run under normal use and
service without nuisance trips. Such a device,
sized properly, gives maximum equipment
protection. The principal reason for specifying
a time delay type is to prevent nuisance trips
when the unit starts.
In the event that a fuse does blow or a breaker
trips, always determine the reason. Do not arbi-
trarily put in a larger fuse or breaker and do not,
in any case, exceed the maximum size listed on
the data label of the unit.
3. LOCATING THE THERMOSTAT
Locate the thermostat away from drafts and
slamming doors and place it where there is a free
fl ow of air. Mount on an inside wall approximately
fi ve feet from the fl oor.
Do not locate near a lamp, kitchen range, direct
sunlight, or in line with air fl ow from supply
registers.
These units are two stages Cooling and Heat-
ing units. They require a 2-stage Cooling/
Heating thermostat. The heat-cool thermostat
is equipped with a system HEAT-COOL switch,
which provides a positive means of preventing
simultaneous operation of the heating and
cooling units. The thermostat is also equipped
with on ON-AUTO fan switch which allows the
home owner to operate the indoor blower when
air circulation is desired.
Connect the low voltage wires to the respective
terminals on the thermostat base. See thermostat
instruction sheet for more detailed information.
(See Figure 10).
Refer to furnace installation instructions for
required connections and proper heat anticipa-
tor setting when installing unit with an external
furnace.
If two stage heating is desired, an optional
outdoor thermostat may be installed: Connect
the thermostat to the orange low voltage wire and
the W terminal on the indoor thermostat base
(See Figure 10). See the thermostat instructions
for details on setting the outdoor thermostat.
4. ELECTRIC HEAT PACKAGE (OPTIONAL)
The air conditioner is shipped without an auxil-
iary electric heat kit installed. If electric heat is
desired, an accessory Heater Kit must be fi eld
installed. See Specifi cations Sheet for available
kits and their applications.
• Select the correct size heat package for the
installation.
• Follow installation instructions provided with
each heater kit.
• Installation is most easily accomplished
before making duct or electrical connec-
tions.
• The blower must be set to high speed for
electric heat operation.

SYSTEM OPERATION

1. PRE-START CHECK LIST
The following check list should be observed prior
to starting the unit.
Is the unit level? It should be level or slightly
slanted toward the drain for proper conden-
sate drainage.
Is the unit installed with the proper clear-
ances (See Figure 2)?
Is the wiring correct according to the wiring
diagram and electrical codes?
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