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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:
Amount specified on
nameplate
*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
Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the temperature
of the liquid line or when pressure drop is equal to or greater than 20 psig.
NOTE
The above nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information.
OUTDOOR UNIT
CHECK / EXPANSION
VALVE
BI−FLOW FILTER / DRIER
LIQUID LINE
SERVICE PORT
NOTE − Use gauge ports on vapor line valve and liquid valve for evacuating refrigerant lines and
indoor coil. Use true suction port to measure vapor pressure during charging.
Adjust amount. for variation in line set
length listed on line set length table below.
+
Refrigerant Charge per Line Set Length
LIQUID LINE SET DIAMETER
3/8" (9.5 MM)
Figure 18. Using HFC−410A Weigh In Method
DISTRIBUTOR
OUTDOOR
COIL
MUFFLER
COMPRESSOR
Figure 19. Heat Pump Cooling Cycle
Additional charge specified per
match indoor air handler or coil
listed in table 3.
+
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)
REVERSING VALVE
TRUE SUCTION
PORT
CHECK / EXPANSION VALVE
Page 23
=
NOTE − ARROWS INDICATE DIRECTION
OF REFRIGERANT FLOW
INDOOR UNIT
VAPOR
SERVICE
PORT
Total Charge
INDOOR
COIL
XP13 SERIES
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