National Comfort Products
539 Dunksferry Road • Bensalem, PA 19020
(215) 244-1400 • 1-800-523-7138 • Fax: (215) 244-9579
SPLIT-SYSTEM CONDENSING UNIT INSTALLATION INSTRUCTIONS
1000 3000 4000 SERIES
Before Installing Unit
Check all local codes and ordinances that could affect in-1.
stallation. The manufacturer assumes no responsibility for
equipment installed in violation of any code requirements.
Be sure that the electrical data specied on the unit rating 2.
plate corresponds to what is available at the installation site
and NEC for installation requirements.
Be sure that the electrical service provided to the building 3.
can handle the load imposed by the unit.
This unit should be installed in an outside wall for thru-the-4.
wall installation ONLY.
NCP condensing units may only be used with indoor evapo-5.
rator coils utilizing an expansion (TXV) valve. Self-equaliz-
ing components are required to reduce compressor starting
problems. If self-equalizing components are not used, eld
installed hard start kits will be required.
Hard start kits must be compatible with Bristol compres-
sors.
Start Cap for Various Sizes µFd/Volts
18,000 BTU 145-175/330
24,000 BTU 145-175/330
30,000 BTU 145-175/330
Start relays to be sized to µFd of capacitor used.
The unit must be installed with the top level front to rear 6. and
left to right.
In thru-the-wall installation, due to the various types of wall con-
struction, it is not possible to provide detailed instructions. The
following is a list of general requirements and cautions for in-
stalling these units.
Masonry walls must have a lintel to support the wall.1.
Extend the unit approximately 3/4” beyond outside surface 2.
of the wall. Optional mounting angles can be purchased
from the factory or eld fabricated for locating and mounting
the unit in the wall.
The wall opening across the top and bottom must be 3.
ashed. Bottom ashing to cover the full foot print of unit
and extend up 2’’ on 3 sides. All openings around the top,
sides and bottom must be caulked and sealed. Care must
be taken not to plug the openings in the front of the base
pan of the unit.
Step 1 - Thru-the-Wall Installation
If the optional wall sleeve is used, caulk the spaces between the
sleeve and the wall. Completely ll the clearance between the
unit and the wall sleeve with a polyurethane foam sealant (Fol-
low manufacturer’s suggested application manual).
During periods of rain and wind the primary drainage path 4.
may not be adequate to handle the load. Secondary pre-
cautions may also be required but not limited to the follow-
ing:
a. Seal ashing to unit
b. Floor drain
c. Additional eld sealing of sheet metal joints
d. Sealing of unused access opening
Clearances to air inlets and outlets must be adequate to en-5.
sure no air ow obstructions or recirculation of condenser
air ow.
Some architectural designs of buildings will require the unit 6.
to be mounted behind a decorative grille. The performance
(capacity and efciency) of the unit may be reduced with
the use of these decorative grilles.
The less resistive these grilles are to air ow, the better the units
performance will be.
Outdoor louvers provided by others must be approved by NCP
to maintain unit performance and warranty. Care must be taken
to locate coil intake side of unit away from loose debris that may
clog intake.
If the unit is mounted behind a decorative grille, one or both 7.
of the following items must be done to eliminate recircula-
tion of air to the unit:
a. The front of the unit must be mounted tight to the inside
of the architectural grille
b. A barrier must be provided to prevent recirculation of air
to the unit (mixing of inlet and outlet air) when the front
of the unit is mounted back from the inside of the arch-
tectural grille
The unit 8. must not be mounted in dead-end hallways or ar-
eas where there is no fresh outside air circulation. Cool
fresh outside air must be provided for best unit operation.
Thru-the-wall units may not be located where hot exhausts
from clothes dryer vents, kitchen vents, steam vents or cor-
rosive fumes could come in contact with coil side of unit.
30” clearance is required for service accessibility on the in-9.
side. If more than one unit is to be installed in the same
area a min. of 48’’ vertical must be maintained between
units to minimize recirculation of condenser exhaust air.
THE UNIT MUST NEVER BE PLACED ON ITS SIDE OR UPSIDE DOWN AS THE COMPRESSOR OIL WILL RUN IN THE COOLING
CIRCUIT AND SERIOUSLY DAMAGE THE UNIT. BASE PAN MUST ALWAYS BE ON THE BOTTOM OF THE INSTALL.
1
14299706 09/10
R410a
PLEASE NOTE: ALL 2.5 TON UNITS (430 MODELS)
HAVE BEEN DISCONTINUED.
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