National Comfort Products NCHP-018-1019 User manual

Defrost Board
Replacement Kit
Please read the entire installation guide before starting the installation.
All phases of this installation must comply with National, State and Local codes.
This manual must be left with the homeowner for future reference.
National Comfort Products
A Division of National Refrigeration and Air Conditioning Products, Inc.
539 Dunksferry Road • Bensalem, PA 19020-5908
[phone] • Fax [phone]
www.nationalcomfortproducts.com
HEATING & A/C EQUIPMENT
NATIONAL
COMFORT
PRODUCTS
®
Go Thru-the-Wa
HEATING & A/C EQUIPMENT
NATIONAL
COMFORT
PRODUCTS
®
Installation
Guide
Thru-the-Wa Comfort for a types of Multi-Family Construction

Important: This document is customer property and is to remain with this unit.
DO NOT DESTROY OR THROW AWAY THIS MANUAL.
IT SHOULD BE KEPT IN A SAFE PLACE FOR FUTURE REFERENCE.
.

3
Installation Guide |Defrost Board Replacement Kit
Safety Warnings.......................................................................................... Page 4
Defrost Board Replacement Kit Compatibility.............................................. Page 4
Defrost Board Replacement Kit Installation................................................. Page 5
Defrost Board Wiring Diagram..................................................................... Page 9
Defrost Board Replacement Parts Guide...................................................... Page 10
Table of Contents

4
Installation Guide |Defrost Board Replacement Kit
• ENSURE THAT ALL POWER IS DISCONNECTED
PRIOR TO ATTEMPTING INSTALLATION OF THIS
HEATER KIT. THERE MAY BE MORE THAN ONE
DISCONNECT SERVICING THE UNIT.
• A MEANS OF STRAIN RELIEF AND CONDUCTOR
PROTECTION MUST BE PROVIDED AT THE
SUPPLY WIRE ENTRANCE INTO CABINET.
• USE COPPER CONDUCTORS ONLY.
• INSTALLATION MUST FOLLOW NATIONAL
ELECTRIC CODE ANDOTHER APPLICABLE
CODES.
If this appliance is installed in an enclosed area
such as a garage or utility room with any carbon
monoxide producing appliance, ensure the area is
properly ventilated.
Safety Warnings!
Defrost Board Replacement
Kit Compatibility
Replacement Models:
NCHP-018-1019
NCHP-018-3019
NCHP-024-1019
NCHP-024-3019
NCHP-030-1019
NCHP-030-3019
NHPA-418-3019
NHPA-418-5019
NHPA-424-3019
NHPA-424-5019
NHPA-430-3019
NHPA-430-5019
ATTENTION INSTALLING PERSONNEL
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
!WARNING
!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.
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.
!CAUTION
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.
Be sure that the electrical service provided to the building can handle
the load imposed by the unit.
“USE COPPER SUPPLY WIRES ONLY”
DSHP models may require further modication
*Only compatible with models that use the ICM 321
Defrost Board.
*List is subject to change without notice.

5
Installation Guide |Defrost Board Replacement Kit
Defrost Board Replacement Kit Installation (For Compatibility List See Page 4)
1. Remove the access panel from the cabinet.
2. Disconnect all wires from the control board. Remove
the four fasteners securing the board to the control
box and remove the board.
3. Align the defrost board bracket with the four holes
in the control box and secure it using the four sheet
metal screws.
4. Carefully insert the four plastic standoffs to the
new control board.

6
Installation Guide |Defrost Board Replacement Kit
5. Insert the plastic standoff in the center four holes of
the metal bracket.
(Ensure orientation of the control board matches gure)
6. Attach the brass temperature sensor to the second
capillary tube coming out of the TXV using the
provided clip. Secure using a zip tie and completely
cover the sensor with cork tape.
7. Feed the white plastic temperature sensor through
the 3/8” hole on the right side of the coil. Push
through the grille.
8. Alternatively, if the model does not have a 3/8” hole
on the right side of the coil run the white temperature
sensor over the fan deck and hang on the outside
of the grille. Use the entire length of the wire getting
the sensor as far down the back side of the unit as
possible. On the fan deck use foil tape to secure the
wire.
Make sure the wire is out of the path of the fan blades.

7
Installation Guide |Defrost Board Replacement Kit
9. Connect the wires to the control board.
(Refer to the wiring diagram included with the kit or on
page 9 of this manual)
10. Change the defrost curve setting on the control
board to match your unit.
(Refer to page 8 for defrost curve settings)
11. Reattach access panel
ON CTS
12
ON CTS
12

8
Installation Guide |Defrost Board Replacement Kit
Demand Defrost Curves:
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
100
OAT (°F)
OCT (°F)
DEFROST CURVES
Defrost Curve_1 Defrost Curve_2 Defrost Curve_3 Defrost Curve_4 Inhibitor Set point Termina�on Set point
Timed defrost
Demand Defrost
Inhibit Defrost Cycle
Terminate Defrost Cycle
4 3 2 1
Dip Switch setting On Defrost Board
Defrost Curve Dip Switch 1 Dip Switch 2
1 Off Off
2 On Off
3 Off On
4 On On
Demand Setting
Defrost Test
ON CTS
12
The demand defrost curve setting is important for system performance
and equipment protection. During heating operation, the outdoor coil
accumulates frost. Each system can accumulate frost on the outdoor coil at
different rates. It is NECESSARY for the installer to check that the appropriate
defrost curve is selected for your system by referencing the defrost curve
plot above. For defrost curve adjustments refer to the dip switch setting
table dip switch positions to select the desired curve. A defrost test can be
initiated by pressing the button provided on the defrost control board. Once
the button is pressed the system will go into a 60 second timed defrost.
Note: Adjustment of the defrost curve may be necessary to provide
complete defrost for your climate zone. Refer to the defrost curve plot
above to select the appropriate defrost settings for your climate zone. If using ALTERNATIVE POSITION of the ambient temperature sensor
select DEFROST CURVE 1 for the dip switch settings.

9
Installation Guide |Defrost Board Replacement Kit
CFM
LEGEND
CC T1 - CONTACTOR LOAD SIDE 1
CFM - CONDENSER FAN MOTOR
DB - DEFROST BOARD
HPS - HIGH PRESSURE SWITCH
LPS - LOW PRESSURE SWITCH
OAT - OUTDOOR AIR TEMP. SENSOR
OCT - OUTDOOR COIL TEMP. SENSOR
RV - REVERSING VALVE
14262099-KIT
1/6/2023
JOB NUMBER
DATE
DRAWN BY
BS
WIRING DIAGRAM
14299236
CC Coil
HPS LPS
Defrost Board Replacement Kit
C C RV CC
OR Y C
OCT
CFM Fan
OCT
C
NC
DB
FAX: [phone]
Phone: [phone]
Bensalem, Pa. 19020
539 DUNKSFERRY RD.
HPC LPC
In Out In Out
Demand Setting
Defrost Test
W
OAT
Y W RC O
OAT
ORANGE
RED
WHITE
YELLOW
BLACK
ON CTS
12
CC L1
RV Solenoid
*Use jumper when HPS is not used

Installation Guide |Defrost Board Replacement Kit
Defrost Board Replacement Parts Guide
Item Part Description Part Number
1Part Bag (9x12) 5-394
2NHPA Icm321 5 Wire Harness 142-30-058
3NHPA Coil Defrost Sensor 142-60-025
4NHPA Ambient Defrost Sensor 142-60-026
5NHP Defrost Control Board 142-62-099
6Defrost Board Replacement IOM 142-99-242
7Part Bag (7x8) 5-386
88"Wire Tie T59-033
9Cork Insulation Tape 142-31-001
10 3/4” Nylon Circular Board Mounts 142-62-061
11 Screw #12 Hwh Sertd Flange 142-95-037
12 Defrost Board Bracket 143-56-061
13 Label 142-62-099-Kit 142-99-241
10

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14299242 Defrost Board Replacement Kit 04/2023
HEATING & A/C EQUIPMENT
NATIONAL
COMFORT
PRODUCTS
®
National Comfort Products®
A Division of National Refrigeration & Air Conditioning Products, Inc.
539 Dunksferry Road |Bensalem, PA 19020
1-800-523-7138 |Fax: [phone]
www.nationalcomfortproducts.com