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Thru-the-Wall Comfort for all types of Multi-Family Construction
Installation
Guide
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.
Go Thru-the-Wall
National Comfort Products
NATIONAL
®
A Division of National Refrigeration and Air Conditioning Products, Inc.
COMFORT
PRODUCTS
539 Dunksferry Road • Bensalem, PA 19020-5908
(800) 523-7138 • Fax (215) 639-1674
www.nationalcomfortproducts.com
HEATING & A/C EQUIPMENT
NATIONAL
®
COMFORT
PRODUCTS
HEATING & A/C EQUIPMENT
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Summary of Contents for National Comfort Products NCHP-018-1019
- Page 1 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 Go Thru-the-Wall NATIONAL ®...
- Page 2 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.
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Page 3: Table Of Contents
Installation Guide | Defrost Board Replacement Kit Table of Contents 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... -
Page 4: Safety Warnings
Failure to follow these instructions may result in improper installation, adjustment, service or maintenance possibly resulting in fire, electrical shock, property damage, personal injury or death. Replacement Models: NCHP-018-1019 WARNING NCHP-018-3019 NCHP-024-1019 Installation and repair of this unit should be performed ONLY by NCHP-024-3019 individuals meeting the requirements of an “entry level technician”... -
Page 5: Defrost Board Replacement Kit Installation
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. 3. Align the defrost board bracket with the four holes in the control box and secure it using the four sheet metal screws. - Page 6 Installation Guide | Defrost Board Replacement Kit 5. Insert the plastic standoff in the center four holes of 7. Feed the white plastic temperature sensor through the metal bracket. the 3/8” hole on the right side of the coil. Push through the grille.
- Page 7 Installation Guide | Defrost Board Replacement Kit 9. Connect the wires to the control board. 11. Reattach access panel (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.
- Page 8 Installation Guide | Defrost Board Replacement Kit Demand Defrost Curves: DEFROST CURVES Defrost Curve_1 Defrost Curve_2 Defrost Curve_3 Defrost Curve_4 Inhibitor Set point Termina�on Set point Terminate Defrost Cycle Inhibit Defrost Cycle Timed defrost Demand Defrost OCT (°F) The demand defrost curve setting is important for system performance and equipment protection.
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Page 9: Defrost Board Wiring Diagram
Installation Guide | Defrost Board Replacement Kit Y W R CC L1 CFM Fan Demand Setting Defrost Test C C RV CC In Out In Out RV Solenoid CC Coil *Use jumper when HPS is not used LEGEND WIRING DIAGRAM CC T1 - CONTACTOR LOAD SIDE 1 CFM - CONDENSER FAN MOTOR 539 DUNKSFERRY RD. -
Page 10: Defrost Board Replacement Parts Guide
Installation Guide | Defrost Board Replacement Kit Defrost Board Replacement Parts Guide Item Part Description Part Number Part Bag (9x12) 5-394 NHPA Icm321 5 Wire Harness 142-30-058 NHPA Coil Defrost Sensor 142-60-025 NHPA Ambient Defrost Sensor 142-60-026 NHP Defrost Control Board 142-62-099 Defrost Board Replacement IOM 142-99-242... - Page 11 This Page Left Intentionally Blank...
- Page 12 NATIONAL ® COMFORT PRODUCTS HEATING & A/C EQUIPMENT National Comfort Products ® A Division of National Refrigeration & Air Conditioning Products, Inc. 539 Dunksferry Road | Bensalem, PA 19020 1-800-523-7138 | Fax: (215) 639-1674 www.nationalcomfortproducts.com 14299242 Defrost Board Replacement Kit 04/2023...
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