Refrigerant vertical risers height restrictions
Refrigerant vertical risers height restrictions
(OP)
Commonly manufacturers (of DX split systems) appear to indicate that the height of a vertical refrigerant risers can be installed as long as a trap in installed for every, say 25 feet, of vertical rise BUT then state in that there is a restriction on the vertical rise of only 20 feet, no traps to extend this height, flat out 20 feet only. Why state for a riser "every 25 feet install a trap" if the riser can only be 20 foot max. to start?
There are a lot of split systems out there that are installed, operating and breaking this rule.
There are a lot of split systems out there that are installed, operating and breaking this rule.





RE: Refrigerant vertical risers height restrictions
RE: Refrigerant vertical risers height restrictions
However, Mitsubishi (Mr. Slim type units) indicate a height as much as 164 feet and a one way length of also 164 feet. It indicates a derating factor as you go beyond 25 feet.