Johnson Controls Hitachi MW-NP282A3 Installation Manual
Johnson Controls Hitachi MW-NP282A3 Installation Manual

Johnson Controls Hitachi MW-NP282A3 Installation Manual

Multi-kits

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Installation Manual for Multi-Kits
Line Branch Models: MW-NP282A3, MW-NP452A3, MW-NP692A3, MW-NP902A3
After installation, it is recommended to give this manual to customer for future reference.
1. Applicable Outdoor Units
These multiple line branches can be applied to the R410A VRF systems.
2. Transportation
Transport this product as close to the installation site as practical before unpacking. Do not discard any foam
packaging as it is used as insulation for the joint kits after pressure testing is complete.
Important Notice
Johnson Controls-Hitachi Air Conditioning pursues a policy of continuing improvement in design and
performance of its products. As such, Johnson Controls-Hitachi Air Conditioning reserves the right to make
changes at any time without prior notice.
Johnson Controls-Hitachi Air Conditioning cannot anticipate every possible circumstance that might involve a
potential hazard.
This heat pump air conditioning unit is designed for standard air conditioning applications only. Do not use
this unit for anything other than the purposes for which it was intended for.
electrical codes. The following standards may be applicable, if local regulations are not available. International
Organization for Standardization: (ISO 5149 or European Standard, EN 378). No part of this manual may be
reproduced in any way without the expressed written consent of Johnson Controls-Hitachi Air Conditioning.
This heat pump air conditioning unit will be operated and serviced in the United States of America and comes
with a full complement of the appropriate Safety, Danger, and Caution, warnings.
If you have questions, please contact your distributor or dealer.
This manual provides common descriptions, basic and advanced information to maintain and service this heat
pump air conditioning unit which you operate as well for other models.
This manual should be considered as a permanent part of the air conditioning equipment and should remain
with the air conditioning equipment.
Product Inspection upon Arrival
1. Upon receiving this product, inspect it for any damages incurred in transit. Claims for damage, either apparent
2. Check the model number, electrical characteristics (power supply, voltage, and frequency rating), and any
accessories to determine if they agree with the purchase order.
3. The standard utilization for this unit is explained in these instructions. Use of this equipment for purposes
other than what it designed for is not recommended.
4. Please contact your local agent or contractor as any issues involving installation, performance, or
by a customer without the written consent of Johnson Controls-Hitachi Air Conditioning. Performing any
mechanical alterations on this product without the consent of the manufacturer will render your warranty null
and void.
NOTICE
Do not place any material on this product.
1
P5416959

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Summary of Contents for Johnson Controls Hitachi MW-NP282A3

  • Page 1 Important Notice Johnson Controls-Hitachi Air Conditioning pursues a policy of continuing improvement in design and performance of its products. As such, Johnson Controls-Hitachi Air Conditioning reserves the right to make changes at any time without prior notice. Johnson Controls-Hitachi Air Conditioning cannot anticipate every possible circumstance that might involve a potential hazard.
  • Page 2: Signal Words

    Never bypass or jump-out any safety device or switch. Johnson Controls-Hitachi Air Conditioning will not assume any liability for injuries or damage caused by not Conditioning products are prohibited as they…...
  • Page 3: Installation Precautions

    When a wireless controller is used, locate at a distance of at least 3.3 ft. (1m) between the indoor unit and Do not install the unit in any location where animals and plants can come into direct contact with the outlet air Do not install the unit with any downward slope to the side of the drain adapter.
  • Page 4: Electrical Precautions

    When shielded cabling is applied, proper bonding and termination of the cable shield is required as per Johnson Controls-Hitachi Air Conditioning guidelines. Plenum and riser ratings for communication cables must be considered per application and local code requirements.
  • Page 5: Before Installation

    Make sure that the terminals do not come into contact with the surface of the electrical box. If the terminals are too close to the surface, it may lead to failures at the terminal connection. Turn OFF and disconnect the unit from the power supply when handling the service connector. Do not open the service cover or access panel to the indoor or outdoor units without turning OFF the main power supply.
  • Page 6: Installation Work

    4. Installation Work 4.1 Piping Connection Size the pipe size. Allow adequate space for elbow, angled, and irregular piping arrangements to compensate for expansion and contraction brought on by temperature change. Unit: inch, ID: Inner Diameter, OD: Outer Diameter Branch Pipe for Branch Pipe for Reducer for Reducer for...
  • Page 7 4.2 Installation Position Horizontal Installation Locate the “Y” union pipe section on the same horizontal plane. (Inclination within 30 Make the straight section a minimum of 1.6ft (0.5m) after the vertical bend. Upward Total Straight Section Inclination Min. 1.6ft (0.5m) within 30 Horizontally Inclination...
  • Page 8 4.3 Connection Procedure for Piping Joint When connecting liquid piping for the unit with a capacity 15 MBH or smaller, and when the length of piping is 49.2ft (15m) or longer, use a piping diameter size of 3/8 inch (9.52mm). Secure the connecting pipe as shown below.
  • Page 9 Make sure that all stop valves for the outdoor unit are closed completely. Blow-out the inside of the pipes with nitrogen gas before brazing. Bleed nitrogen gas through piping during brazing. Pressure not to exceed 2.9psi (0.02MPa). Make sure that a test for leakage of refrigerant gases has been performed. The refrigerant used for this The airtight test pressure for this product is 601psi (4.15MPa).
  • Page 12 © 2017 Hitachi-Johnson Controls Air Conditioning, Inc. P5416959-rev.2 Code No. LIT-1202411 Revised January 2020...

This manual is also suitable for:

Hitachi mw-np452a3Hitachi mw-np692a3Hitachi mw-np902a3

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