Installation Guide for NHPA Split-System Heat Pumps
5
Unit Location Considerations
In thru-the-wall installation, due to the various types of wall
construction, it is not possible to provide detailed instructions.
The following is a list of general requirements and cautions for
installing these units.
The unit must be installed level, both -
top front to back and left to right.
1.
Masonry walls must have a lintel to support the wall.
2.
Extend the unit approximately 3/4
"
beyond outside surface of
the wall. Optional mounting angles can be purchased from the
factory or field fabricated for locating and mounting the unit in
the wall.
3.
The wall opening across the top and bottom must be 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.
4.
During periods of rain and wind the primary drainage path
may not be adequate to handle the load. Secondary precautions
may also be required but not limited to the following:
a. Seal flashing to unit
b. Floor drain
c. Additional field sealing of sheet metal joints
d. Sealing of unused access opening
5.
Clearances to air inlets and outlets must be adequate to ensure
no air flow obstructions or recirculation of condenser air flow.
6.
Some architectural designs of buildings will require the unit
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.
7.
If the unit is mounted behind a decorative grille, one or both
of the following items
must be
done to eliminate recirculation 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
architectural grille
8.
The unit must not be mounted in dead-end hallways or areas
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 corrosive fumes could come in
contact with coil side of unit.
9.
30
"
clearance is required for service accessibility on the inside
service panel.
10
. 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.
11.
Care must be taken when locating the unit. Locate away form
bedrooms as operational sounds may be objectionable. (See
sound cover on page 18).
12.
The NCP heat pump is provided with a condensate pan
including a 3/4” MPT drain connection. Provisions must be
made for field piping to the building drain system for condensate
disposal in accordance with local codes. Field piping to the drain
connection must be pitched down and may be done through the
rear flange of the unit.).
Refrigerant Piping Limits
1. The maximum length of refrigerant lines from the through the
wall unit to indoor unit should NOT exceed fifty (50) feet without
contacting the manufacturer.
2. The maximum vertical change should not exceed twenty (20)
feet without contacting the manufacturer.
Liquid Line
Vapor Line
Insulation
IMPORTANT: THE VAPOR LINE MUST
ALWAYS BE INSULATED. DO NOT
ALLOW THE LIQUID LINE AND VAPOR
LINE TO COME IN DIRECT (METAL TO
METAL) CONTACT.
