NCP 1000 Series User manual

Please ll in the following information and le it for
future reference.
MODEL NO.______________________________
SERIAL NO.______________________________
INSTALL DATE ___________________________
This unit should be installed in an
Outside Wall For
Thru-The-Wall
Installation Only!
All Units Department of Energy Listed
*Please consult the DOE Compliance Certification Database (https://tinyurl.com/NCPCondensers)
for a list of rated combinations of indoor and outdoor units.
NCP
Series:
1000
3000
4000
5000
Installation Guide
Thru the Wall
Condensing Unit
Read Installation Manual
Prior To Starting The Installation.
This manual must be left with the homeowner for future reference.
HEATING & A/C EQUIPMENT
NATIONAL
COMFORT
PRODUCTS
®
Thru-the-Wall Comfort for all types of Multi-Family Construction
National Comfort Products
A Division of National Refrigeration and Air Conditioning Products, Inc.
539 Dunksferry Road • Bensalem, PA 19020-5908
[phone]
www.nationalcomfortproducts.com
HEATING & A/C EQUIPMENT
NATIONAL
COMFORT
PRODUCTS
®
Go Thru-the-Wa

2

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Installation Guide |Thru the Wall Condensing Units NCP Series 1000/3000/4000/5000
Page
Nomenclature................................................................................................................................................................ 4
Safety Warning ............................................................................................................................................................. 5
Before You Start............................................................................................................................................................ 6
High Voltage and Power Supply.................................................................................................................................... 7
Check for Clearances .................................................................................................................................................... 7
Unit Location Considerations........................................................................................................................................ 7
Refrigerant Piping Limits .............................................................................................................................................. 8
Leak Checking............................................................................................................................................................... 9
Evacuation, Electrical Connections................................................................................................................................ 10
Start Up, Sequence of Operations................................................................................................................................. 11
Refrigerant Charging..................................................................................................................................................... 12
Maintenance, Checkout Procedure................................................................................................................................ 14
Noise, Insulated Sound Cover....................................................................................................................................... 15
Important! Before Removing a Warranty Compressor.................................................................................................. 16
Wiring Diagrams........................................................................................................................................................... 17
Specifications, Dimensional Drawings .......................................................................................................................... 18-19
Matched systems with Cased Coils............................................................................................................................... 20
Matched systems with Air Handlers.............................................................................................................................. 20
Replacement Parts - NCP 1000 Series.......................................................................................................................... 21
Replacement Parts - NCP 3000 Series.......................................................................................................................... 22
Replacement Parts - NCP 4000 Series.......................................................................................................................... 23
Replacement Parts - NCP 5000 Series.......................................................................................................................... 24
Warranty ....................................................................................................................................................................... 25-26
IMPORTANT NOTE: DO NOT DESTROY OR THROW AWAY THIS MANUAL.
IT SHOULD BE KEPT IN A SAFE PLACE FOR FUTURE REFERENCE.

Installation Guide |Thru the Wall Condensing Units NCP Series 1000/3000/4000/5000
4
Split System Condensing Unit Nomenclature
NCP
NCP = Condensing Unit
4
Refrigerant
4 = R410A
18
Capacity
18 = 1.5 Ton
24 = 2 Ton
30 = 2.5 Ton
1000
Series
1000
3000
4000
5000
B A
Option
A = Standard
D = Deluxe
C = Crankcase Htr
L = Low Ambient
1
Factory Use
-
Generation

5
Installation Guide |Thru the Wall Condensing Units NCP Series 1000/3000/4000/5000
Safety Warnings!
This appliance is not intended for use by those (including children)
with reduced physical, sensory or mental capabilities, or lack of
experience and knowledge, unless they have been given supervision
or instructions concerning use of the appliance by a person
responsible for their safety. Children should be supervised to ensure
that they do not play with the appliance.
This appliance is intended to be installed up to 10,000 ft
(3,000 m) above sea level.
This appliance is only compatible with an Indoor unit that uses
R410A refrigerant.
Wheninstalling thisunitwithan indoorevaporatingunit, themaximum
operating pressure is to be considered during the installation. The
maximum operating pressure of the system should not exceed the
value as indicated on the nameplate of this condensing unit.
This model series NCP4*******-** is a PARTIAL UNIT air-
conditioner, complying with PARTIAL UNIT requirements of
the International Standard of UL-60335-2-40, and must only be
connected to the other units that have been confirmed as complying
to corresponding PARTIAL UNIT requirements of the International
Standard of UL-60335-2-40.
This is a safety alert symbol. When you see this symbol on
labels or in manuals, be alert to the potential for personal injury.
Pay particular attention to words such as DANGER, WARNING or
CAUTION.
DANGER indicates an imminently hazardous situation, which will
result in serious injury or death
WARNING indicates a potentially hazardous situation, which could
potentially result in serious injury or death
CAUTION indicates a potentially hazardous situation, which may
result in minor or moderate injury. It is also used to alert against
practices that are unsafe and can result in property damage.
!WARNING
HIGH VOLTAGE! Disconnect ALL power before servicing.
Multiple power sources may be present. Failure to do so may
result in property damage, personal injury or death.
!WARNING
These instructions are intended as an aid to qualied, licensed
service personnel for proper installation, adjustment and operation of
this unit. Read these instructions thoroughly before attempting
installation or operation. Failure to follow these instructions may
result in improper installation, adjustment, service or maintenance
possibly resulting in re, electrical shock, property damage, personal
injury or death.
!WARNING
!WARNING
!WARNING
!CAUTION
!CAUTION
Installation and repair of this unit should be performed ONLY by
individuals meeting the requirements of an “entry level technician” as
specied by National Codes. Attempting to install or repair this unit
without such background may result in product damage, personal
injury or death.
Do not use oxygen to purge lines or pressurize system for leak
test. Oxygen reacts violently with oil, which can cause an explosion
resulting in severe personal injury or death.
The unit must be permanently grounded. Failure to do so can cause
electrical shock resulting in severe personal injury or death.
Use care when handling scroll compressors. Some temperatures
could be hot!
Scroll compressors should NEVER be used to evacuate the air
conditioning system. Vacuums this low can cause internal electrical
arcing resulting in a damaged or failed compressor.
“USE COPPER SUPPLY WIRES ONLY”
!WARNING
Extreme caution should be exercised when opening the Liquid Line
Service Valve. Turn counter clockwise until the valve stem just
touches the rolled edge. No torque is required. Failure to follow this
warning will result in abrupt release of system charge and may result
in personal injury and /or property damage.

Installation Guide |Thru the Wall Condensing Units NCP Series 1000/3000/4000/5000
6
Installation Guide |Thru the Wall Condensing Units NCP Series 1000/3000/4000/5000
IMPORTANT — This Document is customer property and is to remain
with this unit. Please refer to service information pack upon completion
of work to register the unit’s warranty. These instructions do not cover all
variations in systems or provide for every possible contingency to be met
in connection with the installation. Should further information be desired
or should particular problems arise which are not covered sufficiently for
the purchaser’s purposes, the matter should be referred to your installing
dealer or local distributor before contacting the manufacturer.
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.
Note: The manufacturer recommends installing only approved matched
split systems. Our split systems are A.H.R.I. and DOE rated only with
TXV indoor systems. (Please consult the DOE Compliance Certification
Database (https://tinyurl.com/NCPCondensers) for a list of rated
combinations of indoor and outdoor units. Combinations of outdoor
and indoor units that are not rated will require factory testing and listing
with DOE. Please consult the factory.) Some of the benefits of installing
approved matched split systems are maximum efficiency, optimum
performance and the best overall system reliability. 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 compressors.
Hard start kits MUST be compatible with Copeland compressors -
88-106/330 µF/Volts
Start relays to be sized to µF of capacitor used.
Before You Start
ALL phases of this installation must comply with NATIONAL, STATE
AND LOCAL CODES. The manufacturer assumes no responsibility for
equipment installed in violation of any code requirements.
Be sure that the electrical data specied on the unit rating plate
corresponds to what is available at the installation site and NEC for
installation requirements.
This unit MUST be installed in an outside wall for thru-the-wall installation
ONLY. No pad mounts.
Be sure that the electrical service provided to the building can handle the
load imposed by the unit.
Electrical - Low Voltage
Low Voltage Hook-up Diagram
Make all electrical connections in accordance with the National Electrical
Code and any pertinent local codes or ordinances. Use a separate branch
electrical circuit for this unit. Locate a disconnecting means within sight of
and readily accessible to the unit.
a. Line Voltage Connections
b. Connect the single phase power supply to unit contactor
terminal L1 and L2
c. Connect ground wire to lug
d. Low Voltage Connections
Consult the indoor unit installation instructions for thermostat connections.
Use a 2-wire thermostat cable between the units.
When locating the room thermostat, it should be in the natural circulating
path of room air. Avoid locations where the thermostat would be exposed to
cold air infiltration; drafts from windows, doors or other openings leading to
the outside; exposure to air currents from warm-or-cold air registers or to
exposure where the natural circulation of the air is cut off, such as behind
doors, above or below mantels, shelves, etc.
Low Voltage Maximum Wire Length:
Table defines the maximum total length of low voltage wiring from the
condensing unit to the indoor unit and to the thermostat.
24 VOLTS
WIRE SIZE MAX. WIRE LENGTH
18 AWG 150 ft.
16 AWG 225 ft.
14 AWG 300 ft.
Contactor
Field Wiring Low Voltage
White
Red
Blue

7
Installation Guide |Thru the Wall Condensing Units NCP Series 1000/3000/4000/5000
High Voltage Power Supply
Electrical - High Voltage
NOMINAL
VOLTAGE
MINIMUM
VOLTAGE
MAXIMUM
VOLTAGE
208-230 196 244
!WARNING
LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing and troubleshooting of this
product, it may be necessary to work with live electrical components.
Failure to follow all electrical safety precautions when exposed to live
electrical components could result in death or serious injury.
The high voltage power supply must agree with the equipment nameplate.
OR
Make certain that the volts, hertz, and phase correspond to that specified on
the unit rating plate, and that the service provided by the utility is sufficient
to handle the additional load imposed by this equipment.
Power wiring must comply with national, state, and local codes.
Follow instructions on unit wiring diagram located on the inside of the
access door, or cabinet and in the wiring diagrams included with the unit.
ON
OFF
Disconnect Switch
Thru-the-Wall
Condensing Unit
Install a separate disconnect
switch at the location of the
through the wall unit.
Ground the unit per national, state,
and local code requirements.
Minimum 48"
Vertical Clearance
Between Units
Minimum 12"
Horizontal Clearance
Between Units
Check for Clearances
Unit Location Considerations
WARNING: Warranty will be void on all units installed behind
brick facades (e.g. pigeon holes) or connected to ductwork
(See Note 1 below). All obstacles added to impede air ow
of the condensing unit will decrease performance, cause
premature equipment failure, and void all warranties. Consult
factory with any questions.
Note 1: No ducts are permitted to be connected to the intake or discharge
of the unit.
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.

Installation Guide |Thru the Wall Condensing Units NCP Series 1000/3000/4000/5000
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Installation Guide |Thru the Wall Condensing Units NCP Series 1000/3000/4000/5000
3. The wall opening across the top and bottom must be flashed. Bottom
flashing to cover the full footprint 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 ll 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. Care must be taken to
locate the coil side of the unit away from loose debris that may clog airflow
inlet or outlet.
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.
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. A minimum 48"of vertical clearance and 12"of horizontal clearance
between units is required to minimize recirculation of condenser exhaust
air. For horizontal clearances less than 12", please consult National Comfort
Products.
11. Care must be taken when locating the unit. Locate away form bedrooms
as operational sounds may be objectionable. (See sound cover on page 15)
Refrigerant Piping
1. The maximum length of refrigerant lines from the through the wall unit
to indoor unit should NOT exceed fty (50) feet without contacting National
Comfort Products.
2. The maximum vertical change should not exceed twenty (20) feet without
contacting National Comfort Products.
Maximum Allowable Liquid Line Pressure Drop = 50 PSI
Subtract .43 PSI for each foot of Liquid Lift (if any)
Do Not Exceed this value when selecting Liquid Line
*Call National Comfort Products
for Greater Line Lengths
Air
Handler
or Coil
3. The unit has internally mounted service valves. Field tubing may be
routed through the locations provided in either the top or rear panels. Care
should be taken not to block access to internal components. Seal unused
knockouts with high grade sealant. Gaskets are provided for liquid and
suction lines.
Air
Handler
or Coil
Air
Handler
or Coil

9
Installation Guide |Thru the Wall Condensing Units NCP Series 1000/3000/4000/5000Installation Guide |Thru the Wall Condensing Units NCP Series 1000/3000/4000/5000
4. Run refrigerant lines as directly as possible. Field piping inside the
condensing unit should not block access to major components. Refrigerant
lines should not be in direct contact with the floor or ceiling joists. Use
insulated or suspension type hangers. When refrigerant lines run through
a wall, seal openings around the lines with a flexible material to avoid
vibration to the structure.
Note: Always use refrigeration grade copper tubing that is internally
clean and dry for refrigerant lines. Use clean hard drawn copper tubing
if no appreciable amount of bending is necessary. If soft copper is used,
avoid sharp bends which may cause a restriction. Always use heat
sink materials during brazing to prevent damage to service valves (See
page 10).
Note: Take precautions to prevent noise within the building structure due
to vibration transmission from the refrigerant lines For example:
When the refrigerant lines have to be fastened to floor joists or other
framing in a structure, use isolation type hangers.
Isolation hangers should also be used when refrigerant lines are run in
stud spaces or enclosed ceilings.
Where the refrigerant lines run through a wall or sill, they should be
insulated and isolated.
Isolate lines from all ductwork.
Minimize the number of 90� turns.
5. Standard refrigeration piping practices must be employed when installing
traps. When installing the condenser below the evaporator, the suction line
must be trapped with an inverted trap the height of the evaporator coil.
Consult the factory when total equivalent length of refrigerant lines exceeds
50 ft.
6. Insulate the vapor line with a minimum 1/2"foam rubber or other type
insulation having an adequate vapor barrier. For indoor units with a TXV,
a liquid line filter drier must be installed (SPORLAN #C-083-S or similar).
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.
7. Install the refrigerant lines using the following procedure (See Steps 1
thru 4.)
a. Remove the service port caps and Schrader Cores of the liquid line
service valve and the vapor line service valve of the condensing unit.
Connect low pressure dry nitrogen to the liquid line valve service
port.
CAUTION: Dry nitrogen should always be supplied through
the tubing while it is being brazed, as the high temperature
required for brazing will cause oxidation of the copper unless
an inert atmosphere is provided. The ow of dry nitrogen
should continue until the joints have cooled. Always use a
pressure regulator and safety valve to ensure that only low
pressure nitrogen is introduced into the tubing. Only a small
ow is necessary to displace air and prevent oxidation.
b. Provide a heat sink at the service valve such as wrapping a wet rag
around it, to prevent damage during the brazing operation
c. Braze the liquid line to the service valve. Allow the nitrogen to keep
flowing when brazing the refrigerant line until all brazed joints are
completed.
d. Provide a heat sink to the vapor line service valve of the condensing
unit
e. Braze the vapor line to the service valve
f. When tubing installation is complete, seal openings around tubing
where tubing enters the unit cabinet.
Step 1:
The tubing should be cut
square. Make sure it is
round and free of burrs
at the connecting ends.
Clean the tubing to prevent
contaminants from entering
the system.
Step 2:
Wrap a wet rag around the
copper stub of the service
valve before brazing.

Installation Guide |Thru the Wall Condensing Units NCP Series 1000/3000/4000/5000
10
Step 3:
Flux the copper tube and
insert into the stub. Braze the
joint. No ux is necessary if a
low to zero-silver braze alloy
is used.
Step 4:
After brazing, quench with a
wet rag to cool the joint and
remove any ux residue.
Leak Checking
Leak checking of refrigerant line braze joints and evaporator unit using
dry nitrogen. (See Step 5a)
1. Replace service port cap of the vapor line service valve (cap was removed
for brazing operations).
2. Connect dry nitrogen source to the service port of the liquid line service
valve. Pressurize refrigerant lines and indoor coil to approximately 100 psig.
3. Check for leaks using a liquid soap solution. If any leaks are detected,
purge the nitrogen, repair the leak(s) and repeat the leak check procedure.
Leak checking of refrigerant line braze joints and evaporator unit using
R410a refrigerant. (See Step 5b)
1. Connect R410a source to the service port of the liquid line service valve.
Use of a manifold gauge set will facilitate connecting and disconnecting of
the refrigerant source for leak checking. Pressurize refrigerant lines and
indoor coil with refrigerant gas.
2. Leak check with an electronic leak detector or liquid soap solution. If
any leaks are detected, use a refrigerant recovery system to remove the
refrigerant. Repair the leak(s) and repeat the leak check procedure.
Step 5a:
Step 5b:
Apply liquid soap solution to check for leaks
Bubbles forming in the liquid soap solution indicates a leak
Using a liquid soap solution
Using an electronic leak detector
Leak check with an
electronic leak detector
1. Connect the vacuum pump to the service ports of the liquid line and vapor
line service valves. If the vacuum pump lines do not contain shut-off valves,
hook up the vacuum pump through a manifold gauge set, as the vacuum
pump lines must be closed for step 4 below.
a. If the evacuation is being performed on a new system installation, the
condensing unit service valves should be kept in the closed position.
The vacuum pump will then be able to evacuate the refrigerant lines
and evaporator coil.
Evacuation