Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Hitachi Shirokuma A...
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

Hitachi Shirokuma Air2Air HP

 
Air Source Heat Pumps (ASHPs)
Last Post by Edin67 10 months ago
1 Posts
1 Users
0 Reactions
744 Views
RSS
 Edin67
(@edin67)
New Member Member
Joined: 10 months ago
Posts: 1
Topic starter 19/09/2025 11:05 am   [#2468]

Good day everyone. I'm new here and have a few questions. I want to buy a Hitachi Shirokuma floor mounted model, but I'm not sure if it's a good option.

The distributors here in Bosnia are insisting that, for the proper operation of Shirokuma units (and other Hitachi equipment), a minimum of three meters of piping is required. They further claim that otherwise the warranty would be void.

As a mechanical engineer specializing in energy systems and HVAC, I find this explanation insufficient. In a regulated AC system equipped with an accumulator upstream of the compressor, prescribing a three-meter installation length seems unjustified (“so that all refrigerant could evaporate” – but then, where is the superheat? – my counter-question to which they have no reply).

I have written several times to Johnson Controls - Hitachi Air conditioning Company, UK, asking for instructions, but they have not responded. My questions are as follows:

  • Is the three-meter piping requirement necessary for correct system operation, or is it related to vibration damping?

  • How should I proceed if the unit must be mounted on the same wall, only 35 cm thick, with both indoor and outdoor units back-to-back?

  • What should be done with any excess piping in that case?

  • Finally, would installing only one meter of piping invalidate the warranty?

No answer...

Does this requirement imply that other manufacturers’ units, which do not mandate three meters, are superior to Hitachi? 

Big dilemma... I'm asking anyone who can help me, suggest something else...

Regards, Edin



   
Quote
Topic Tags
Hitachi Shirokuma 3 meters piping
Forum Jump:
  Previous Topic
Next Topic  
Related Topics
Topic Tags:  Hitachi (2) , Shirokuma (1) , 3 meters piping (1) ,
Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Click to access the login or register cheese
Protected By
Shield Security PRO