LMU540HV Installation Guide

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MULTI F / MULTI F MAX Outdoor Unit Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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MULTI
F
MAX
MULTI
F
R410A Refrigerant
R410A refrigerant has a higher operating pressure in comparison to R22 refrigerant and, therefore, all piping system materials installed must
have a higher resisting pressure than the materials traditionally used in R22 systems.
R410A refrigerant is an azeotrope of R32 and R125, mixed at 50:50, so the ozone depletion potential (ODP) is 0.
WARNING
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Note
• Because R410A is a combination of R32 and R125, the required additional refrigerant must be charged in its liquid state. If the refrigerant is
charged in its gaseous state, its composition changes and the system will not work properly.
• Do not heat piping more than necessary during installation. Piping may become soft and fail when pressurized.
•
Do not use any piping that has not been approved for use in high-pressure refrigerant systems. Piping wall thickness must comply with
the applicable local, state, and federal codes for the 551 psi design pressure of R410A. Inadequate piping may fail when pressurized.
R410A REFRIGERANT