950-0289revB - 14 - July 22, 2022
CONNECTING LINE SET
CAUTION! IMPROPER CONNECTION OF THE LINE SETS WILL RESULT IN IMPROPER OPERATION OF
THE SYSTEM. MARK EACH LINE SET AND WIRING FOR IDENTIFICATION.
IDENTIFICATION LABELS
ARE INCLUDED WITH EACH OUTDOOR UNIT. ENSURE THAT THE WIRING AND THE LINE SETS ARE
ROUTED TO THE PROPER INDOOR ZONE.
INDOOR UNITS
Indoor Unit Type
Capacity
Liquid Line
Suction Line
Wall Mounted, Console, Cassette
Floor / Ceiling, Ducted, Air Handler
6K, 9K
1/4
”
3/8
”
12K, 18K
1/4
”
1/2
”
24K, 30K, 36K
3/8
”
5/8
”
OUTDOOR UNITS (adapters included)
Adapter
Refrigerant Tubing
1. After the outside unit is secured to the mounting location (Pad, Wall Brackets, etc.), route the line set(s)
from the Indoor unit to the outdoor unit, and secure with clamps or Plastic-Duct as required.
Installation Notes:
The MZ18H424ZMO / HMZ18H424ZMO Dual Zone unit are designed to run two indoor units. (See
page 6)
The MZ27H424ZMO / HMZ28H424ZMO Quad Zone unit are designed to run two or three units. DO
NOT use this system with one indoor unit. (See page 5)
The MZ36H424ZMO / HMZ36H424ZMO Quad Zone unit are designed to run two, three, or four indoor
units. DO NOT use this system with one indoor unit. (See page 5)
The MZ48H424ZMO / HMZ48H424ZMO Five Port unit is designed to run two, three, four or five indoor
units. DO NOT use this system with one indoor unit. (See page 6)
The outdoor unit is supplied with a sufficient refrigerant charge of R410A for a maximum Design
Length, no extra refrigerant required. Beyond this length additional refrigerant is required and must be
weighted in. (see specifications)
Indoor unit contains a small quantity of nitrogen. DO NOT remove the caps until the tubing is ready to be
installed.
NOTE
: An oil trap is recommended to be installed if the indoor unit is over 15 feet in height from the outdoor
unit. To prevent kinking, bend tubes using a tubing tool.
CAUTION! WHEN REMOVING THE VALVE CAPS, DO NOT STAND IN FRONT OF VALVES, AS THE
SYSTEM IS UNDER HIGH PRESSURE.
CAUTION! DO NOT BRAZE TUBING OR USE THREAD SEALANT. USE FLARE CONNECTIONS ONLY.
Outdoor Unit Type
Port A
liquid-suction
Port B
liquid-suction
Port C
liquid-suction
Port D
liquid-suction
Port E
Liquid-suction
18K Dual Zone
1/4”-3/8”
1/
4”-3/8”
N/A
N/A
N/A
27K Triple Zone
1/4”-3/8”
1/4”-3/8”
1/4”-3/8”
N/A
N/A
28K Triple Zone
(Peak Heat)
1/4”-3/8”
1/4”-3/8”
1/4”-1/2”
N/A
N/A
36K Quad Zone
1/4”-3/8”
1/4”-3/8”
1/4”-3/8”
1/4”-1/2”
N/A
36K Quad Zone (Peak Heat)
1/4”-3/8”
1/4”-3/8”
1/4”-1/2”
1/4”-1/2”
N/A
48K Five Port
1/4”-3/8”
1/4”-3/8”
1/4”-3/8”
1/4”-1/2”
1/4”-1/2”
Figure 10
