11
Heat Controller
VFH InverterFlex
®
- Outdoor Ductless Mini-Split
Refrigerant Line Set Installation
Allowable Length and Height of Line Set
H1
H2
L
x
= Length of line set
from farthest indoor unit
VFH InverterFlex System Line Set Requirements
For systems with only one indoor unit, the maximum line set length (Lx) is:
Outdoor Model
Maximum Length (Lx) Max. Elevation Between Outdoor & Indoor Unit (H1)
A-VFH18/24/30 32.8ft (10m)
24.6ft (7.5m)
A-VFH36/42
82ft (25m)
49.2ft (15m)
For systems with more than one indoor unit, the entire system must pass BOTH requirements below.
Maximum Length Requirement based on Indoor Unit Capacity:
Indoor Model Maximum Length
B-VFH09
49.2ft (15m)
B-VFH12
65.6ft (20m)
B-VFH18/24
82ft (25m)
Total Allowable Length based on Outdoor Unit Capacity:
Outdoor Model Zoning Based on Actual Number of Indoor Units Installed
(See Note 2)
Max.
Elevation
Between
Indoor &
Outdoor (H1)
Max. Elevation
Difference
Between each
Indoor Unit
(H2)
Dual Zone
(L1+L2)
Tri-Zone
(L1+L2+L3)
Quad Zone
(L1+L2+L3+L4)
Penta Zone
(L1+L2+L3+L4+L5)
A-VFH18/24/30 98.4ft
(30m)
172.25ft (52.5m)
229.6ft (70m) N/A
24.6 ft (7.5m)
24.6 ft (7.5m)
A-VFH36/42
104.9ft
(32m)
157.5ft (48m)
209.9ft (64m) 262.5ft (80m)
49.2 ft(15m)
Single Zone Example:
An Outdoor A-VFH18 is installed with (1) B-VFH09 indoor unit. The line set must not exceed 32.8ft (10m) and the indoor
unit must not be more that 24.6 ft(7.5m) higher than the outdoor unit.
Multi-Zone Example:
Lx
