Lennox International Inc LENNOX Elite Series XP13 Units HEAT PUMPS Using HFC−410A Weigh In Method

WEIGH−IN CHARGING

CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE

If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the unit. To calculate the total refriger-
ant charge:			Additional charge specified per
Amount specified on		Adjust amount. for variation in line set	match indoor air handler or coil	Total Charge
	nameplate	length listed on line set length table below.	listed in table 3.
		+	+	=

Refrigerant Charge per Line Set Length

LIQUID LINE SET DIAMETER

3/8" (9.5 MM)

OUNCES PER 5 FEET (GRAMS PER 1.5 METERS) ADJUST FROM 15 FEET (4.6 METERS) LINE SET*

3 OUNCE PER 5’ (85 GRAMS PER 1.5 M)

*If line length is greater than 15 feet (4.6 meters), add this amount. If line length is less than 15 feet (4.6 meters), subtract this amount.

NOTE	emperature
of the liquid line or when pressure drop is equal to or greater than 20 psig.

NOTE . Go to actual nameplate on outdoor unit for charge information.

Figure 18. Using HFC−410A Weigh In Method

OUTDOOR UNIT	DISTRIBUTOR
		NOTE − ARROWS INDICATE DIRECTION
		OF REFRIGERANT FLOW
	REVERSING VALVE
CHECK / EXPANSION
VALVE
	OUTDOOR
	COIL
BI−FLOW FILTER / DRIER		INDOOR UNIT
	MUFFLER
	TRUE SUCTION	VAPOR
	PORT
		SERVICE
		PORT
LIQUID LINE	COMPRESSOR
SERVICE PORT
		CHECK / EXPANSION VALVE

INDOOR

NOTE − Use gauge ports on vapor line valve and liquid valve for evacuating refrigerant lines andCOIL indoor coil. Use true suction port to measure vapor pressure during charging.

Figure 19. Heat Pump Cooling Cycle

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XP13 SERIES