Use and Care Manual
Page 19
Line Set Length Specifications
mrcool.com
18K
2-Zone
Condenser
27K
3-Zone
Condenser
Maximum combined line set
length for all rooms
123 ft
(37.5 m)
172.2 ft
(52.5 m)
Maximum line set length
for one indoor unit
73.8 ft
(22.5 m)
73.8 ft
(22.5 m)
Maximum height difference
between indoor & outdoor unit
33 ft
(10 m)
33 ft
(10 m)
Maximum height difference
between indoor units
33 ft
(10 m)
33 ft
(10 m)
36K
4-Zone
Condenser
48K
5-Zone
Condenser
221.5 ft
(67.5 m)
73.8 ft
(22.5 m)
73.8 ft
(22.5 m)
221.5 ft
(67.5 m)
33 ft
(10 m)
49.2 ft
(15 m)
33 ft
(10 m)
33 ft
(10 m)
Line Set Length & Height Specifications
When installing the ceiling cassette as part of a single-zone (18K capacity cassette & condenser only) or
multi-zone system (9K, 12K, & 18K capacity cassettes can be used with multi-zone condensers), ensure that
the length of the refrigerant pipe and the drop height between the indoor and outdoor units meet the
requirements listed in the tables below:
Units: feet (meters)
18K
Single-Zone Condenser
Maximum line set length
System Capacity
Condenser Capacity
98 ft
(30 m)
Maximum height difference
between indoor & outdoor unit
66 ft
(20 m)
Maximum Line Set Length and Height Specications
18K Ceiling Cassette & 18K Single Zone Condenser
9K, 12K, & 18K Ceiling Cassette when used with a Multi-Zone Condenser
The tables below represents the maximum length and height that the refrigerant line sets can be for each
system based on its respective capacity. In order to achieve some of these lengths, if needed for your
application, line set coupler kits and additional line sets must be used (not included, sold separately). Any
attempt to increase the line set length beyond what is specified in these tables, could result in reduced
heating/cooling performance, system damage or failure, and WILL VOID THE WARRANTY.
IMPORTANT!
Units: feet (meters)