Nordyne Outdoor Heat Pump Two Stage Split System R-410A - Manual (Page 8)

8
• The maximum recommended interconnecting
refrigerant line length is 75 feet, and the vertical
elevation difference between the indoor and
outdoor sections should not exceed 20 feet.
• If precise forming of refrigerant lines
is required, a copper tubing bender is
recommended. Avoid sharp bends and contact
of the refrigerant lines with metal surfaces.
Filter Drier Installation
A fi lter dryer is provided with the unit and must
be installed in the liquid line of the system. If the
installation replaces a system with a fi lter dryer
already present in the liquid line, the fi lter dryer
must be replaced with the one supplied with the
unit. The fi lter dryer must be installed in strict
accordance with the manufacturer’s installation
instructions.
Optional Equipment
Optional equipment such as liquid line solenoid
valves, twinning kit, low ambient, etc., should
be installed in strict accordance with the
manufacturer’s installation instructions.
Roof Mount
WARNING:
To avoid the risk of property damage,
personal injury, or death, it is the
installer’s responsibility to ensure that
whatever means are used to move or lift
the unit are safe and adequate:
Keep the unit in an upright position at
all times.
The method of mounting should be designed
so as not to overload roof structures or transmit
noise to the interior of the structure. Refrigerant
and electrical lines should be routed through
suitably waterproofed openings to prevent water
leaking into the structure.
CONNECTING REFRIGERANT TUBING
BETWEEN THE INDOOR & OUTDOOR UNIT
CAUTION:
This system uses R-410A refrigerant
with POE oil. When servicing, cover or
seal openings to minimize the exposure
of the refrigerant system to air to prevent
accumulation of moisture and other
contaminants.
General Information
After outdoor and indoor unit placement has been
determined, route refrigerant tubing between the
equipment in accordance with sound installation
practices.
• When connecting refrigerant linesets together,
it is recommended that dry nitrogen be fl owing
through the joints during brazing. This will
prevent internal oxidation and scaling from
occurring.
• Refrigerant tubing should be routed in a
manner that minimizes the length of tubing
and the number of bends in the tubing.
• Refrigerant tubing should be supported in
a manner that the tubing will not vibrate or
abrade during system operation.
• Tubing should be kept clean of foreign debris
during installation.
• Every effort should be made by the installer
to ensure that the fi eld installed refrigerant
containing components of the system have
been installed in accordance with these
instructions and sound installation practices to
insure reliable system operation and longevity.
ELECTRICAL CONNECTIONS
WARNING:
Shut off all electrical power to the unit
before performing any maintenance or
service on the system. Failure to comply
may result in personal injury or death.
Pre-Electrical Checklist
 Verify that the voltage, frequency and phase
of the supply source are the same as those
specifi ed on the unit rating plate.
 Verify that the service provided by the utility is
suffi cient to handle the additional load imposed
by this equipment.
 For minimum circuit ampacity and maximum
overcurrent protection, see unit rating plate.
Wiring Diagram / Schematic
A wiring diagram/schematic is located on the
inside cover of the electrical box of the outdoor
unit. The installer should become familiar with
the wiring diagram/schematic before making
any electrical connections to the outdoor unit.
Line Voltage
• Electrical power wiring must comply with the
current provisions of the NEC (ANSI/NFPA
70) and with applicable local codes having
jurisdiction.
• Provide power supply for the unit in accordance
with the unit wiring diagram, and the unit rating
plate.