Page 19
Single Zone Line Set Specifications
mrcool.com
Number of units that can be
used together
Compressor start/stop frequency
Power Source Voltage
Connected units
Stop time
1 unit
Unit: feet (meters)
When installing a single-zone system ensure that the length of the refrigerant pipe and the drop height
between the indoor and outdoor units meet the requirements in the table above and illustrated in
Fig. 4.2 below:
9K
Condenser
12K
Condenser
Max. piping length
for indoor & outdoor unit
82.02 ft
(25 m)
82.02 ft
(25 m)
Max. height difference
between indoor & outdoor unit
32.81 ft
(10 m)
32.81 ft
(10 m)
18K
Condenser
24K
Condenser
98.43 ft
(30 m)
164.04 ft
(50 m)
65.62 ft
(20 m)
82.02 ft
(25 m)
3 minutes or more
Within ±10% of rated voltage
Within ±15% of rated voltage
Within ±3% of rated voltage
Voltage fluctuation
Voltage drop during start
Interval Unbalance
Single-Zone
(Hyper Heat & E-Star)
Refrigerant Piping
Length Requirements
Single-Zone Refrigerant Piping Length & Condenser Specifications
Indoor unit
Indoor unit
Indoor unit Outdoor unit
9K-12K Condenser
32.81 ft (10 m)
18K Condenser
65.62 ft (20 m)
24K Condenser
82.02 ft (25 m)
9K-12K Condenser
32.81 ft (10 m)
18K Condenser
65.62 ft (20 m)
24K Condenser
82.02 ft (25 m)
Maximum Height
Difference Between
Indoor & Outdoor Unit
Fig. 4.2
NOTE: The length of refrigerant piping will
affect the performance and energy efficiency
of the unit. Nominal efficiency is tested on
units with a pipe length of 16.5 ft (5 m). The
standard pipe length in North America is
25 ft (7.5 m). The refrigerant piping should
be a minimum 9.84 ft (3 m) to minimize
excessive noise & vibration.