Lennox XP16 Series Unit Information page 28

WEIGH IN
Use method for adding initial refrigerant charge, and then use
WEIGH IN
CHARGING METHOD
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 refrigerant charge:
Amount specified on
nameplate
refrigerant charge.
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)
*If line length is greater than 15 ft. (4.6 m), add this amount.
If line length is less than 15 ft. (4.6 m), 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.
Figure 18. Using HFC−410A Weigh In Method
Page 28
SUBCOOLING
Additional charge
specified per indoor unit
match−ups
+
=
Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*
3 ounce per 5' (85 g per 1.5 m)
method for verifying
Total charge
XP16