Lennox XP17-024-230-01 Installation And Service Procedure page 78

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
XP17
verifying refrigerant charge.
Adjust amount. for variation
in line set length listed on
line set length table below.
nameplate
+
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 exampled nameplate is for illustration purposes only. Use data listed on actual unit
nameplate for charging.
Figure 49. Using HFC-410A Weigh In Method
Additional charge specified
per indoor unit match-ups on
unit charging sticker.
+
Refrigerant Charge per Line Set Length
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)
Page 78
SUBCOOLING
method for for
Total charge
=