Heat Controller DMH24DB-1, DMC24DB-1 manual Charging, Max elevation

Charging

Charging

■Each outdoor unit is factory charged (nameplate charge) for the evaporator as well as a 7.5m(25ft) line set for each indoor line.

Any time total line set is used either shorter or longer then the nominal 22.5m(75ft: for tri-zone) line set length the refrigerant charge has to be adjusted.

■Whether the line set is made shorter or longer you must adjust the charge based on how many ft of tubing are either added or removed based on 20g(0.22oz) of R-410A per meter(foot).

	Max total length	Max length of	Min length of	Max Elevation	Max elevation	Additional
				between each indoor
Capacity (Btu/h)	of all pipes				between indoor
		each pipe (A/B)	each pipe (A/B)	unit and outdoor unit		Refrigerant
	(A+B)			(h1)	units (h2)
24k	30m(100ft)	15m(50ft)	3m(10ft)	7.5m(25ft)	7.5m(25ft)	20g/m(0.22oz/ft)

Example: A 80ft line set is used for dual - zone 5 additional ft X 0.22 ounces per foot= add 1.1 ounces of R-410A

Important:

If you are ever uncertain of the unit charge, reclaim, evacuate and weigh in the correct charge using the unit nameplate charge adjusting for line sets longer or shorter than 7.5m(25ft) for each indoor unit. Unit is critically charged.

Service Manual 33