Lennox VPA048H4 User Manual

22
Branch Pipe Kit Calculation
Add 1.60 ft. (488 mm) per EACH liquid line branch pipe (incoming pipe size only) for additional charge calculation.
Table 4. Refrigerant Charge Adjustment
Liquid Line
Pipe Size
Additional Refrigerant Per Foot of
Pipe Length
1/4 in. 0.015 lb.
3/8 in. 0.040 lb.
1/2 in. 0.080 lb.
5/8 in. 0.120 lb.
3/4 in. 0.181 lb.
7/8 in. 0.255 lb.
Additional Refrigerant Charge
When refrigerant piping connections have been
completed, it will be necessary to adjust the system
refrigerant charge based on the diameter and length
of the liquid line pipe between the outdoor and indoor
unit(s).
Table 4 lists the refrigerant piping sizes along with
the refrigerant adjustment required per foot of liquid
line pipe.
This system is suitable for use with R-410A
refrigerant only.
1. Calculate the additional refrigerant charge using
the diameter and length of the liquid pipe (only)
using Table 4 below.
2. Calculate the additional refrigerant charge for
each liquid line branch pipe kit.
3. If the ratio of VMDB or V33B Indoor unit capacity
exceeds 80% of all indoor units, use Table 5 to
determine the additional refrigerant charge to
add.
4. Total all calculations.
5. Add the calculated additional refrigerant to the
system.
Liquid Line Length Calculation
Calculate additional refrigerant charge using the diameter and length of the liquid pipe.
Incoming Pipe
Only use this pipe size to
determine the amount of
additional refrigerant charge for
EACH liquid line branch pipe.
Example: The branch pipe kit
has an incoming pipe size of 7/8”
and outgoing pipe sizes of 3/8”
and 5/8”. Use only the incoming
pipe size of 7/8” to calculate the
additional refrigerant charge for
this branch pipe kit.
Refrigerant Flow
Table 5. VMDB or V33B Indoor Unit Capacity Ratio over 80% of All Indoor Units
Additional Charge Amount
Outdoor Unit
Module
Pounds of additional refrigerant
if ratio of VMDB Indoor units
exceeds 80% of all indoor units.
Pounds of additional refrigerant
if ratio of V33B indoor units
exceeds 80% of all indoor units.
VPA036H4M-2P 1.76 2.64
VPA048H4M-2P 2.31 3.30
VPA060H4M-2P 2.75 3.30

Lennox VPA048H4 Specifications

General

Brand	Lennox
Model	VPA048H4
Category	Air Conditioner
Language	English