National Comfort Products
539 Dunksferry Road • Bensalem, PA 19020 • (215) 244-1400 • 1-800-523-7138 • Fax: (215) 244-9579
SPLIT-SYSTEM HEAT PUMP INSTALLATION INSTRUCTIONS
1000
3000
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 specified 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 heat pumps may be used with indoor evaporator coils
5.
utilizing various expansion devices (TXV, capillary tube,
orifice piston). Self-equalizing components are required
to reduce compressor starting problems. If self-equalizing
components are not used, field 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
145-175/250
24,000 BTU
145-175/250
30,000 BTU
145-175/250
Start relays to be sized to µFd of capacitor used
.
The NCP heat pump is provided with a condensate pan in-
6.
cluding a 3/4” MPT drain connection. Provisions must be
made for field piping to the building drain system for con
-
densate disposal in accordance with local codes. Field pip-
ing to the drain connection must be pitched down and may
be done through the rear flange of the unit.
The unit must be installed with the top level front to rear
7.
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 field fabricated for locating and mounting
the unit in the wall.
Step 1 - Thru-the-Wall Installation
The wall opening across the top and bottom must be
3.
flashed. Bottom flashing 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.
If the optional wall sleeve is used, caulk the spaces between the
sleeve and the wall. Completely fill 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 flashing to unit
b. Floor drain
c. Additional field 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 flow obstructions or recirculation of heat pump
air flow.
Some architectural designs of buildings will require the unit
6.
to be mounted behind a decorative grille. The performance
(capacity and efficiency) of the unit may be reduced with
the use of these decorative grilles.
The less resistive these grilles are to air flow, 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.
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.
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