Heat Controller DMH18DB-1 manual Charging, Important:Unit is critically charge

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 15m(50ft) 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/m(0.22oz/ft) of R-410A per meter(foot).

	Max total length			Max Elevation	Max elevation	Additional
		Max length of	Min length of	between each indoor
Capacity (Btu/h)	of all pipes				between indoor
	(A+B)	each pipe (A/B)	each pipe (A/B)	unit and outdoor unit	units (h2)	Refrigerant
				(h1)
18k	30m(100ft)	15m(50ft)	5m(16ft)	7.5m(25ft)	7.5m(25ft)	20g/m(0.22oz/ft)

Example: A 75ft line set is used for dual - zone 25 additional ft X 0.22 ounces per foot= add 5.5 ounces of R- 410A

Important:(Unit is critically charge)

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

Service Manual 33