Owners Manual

PRODUCT SPECIFICATIONS Split System Heat Pump: NXH6
6 428 51 6203 00
Specifications subject to change wi thout notice.
REFRIGERANT PIPING LENGTH LIMITATIONS
Maximum Line Lengths:
The maximum allowable total equivalent length for heat pumps varies depending on the vertical separation. See the tables below for
allowable lengths depending on whether the outdoor unit is on the same level, above or below the outdoor unit.
Maximum Line Lengths for Heat Pump Applications
MAXIMUM ACTUAL LENGTH
ft (m)
MAXIMUM EQUIVALENT LENGTH{
ft (m)
MAXIMUM VERTICAL
SEPARATION ft (m)
Units on equal level 200 (61) 250 (76.2) N/A
Outdoor unit ABOVE
indoor unit
200 (61) 250 (76.2) 200 (61)
Outdoor unit BELOW
indoor unit
SeeTable’Maximum Total Equivalent Length: Outdoor Unit BELOW Indoor Unit’
{ Total equivalent length accounts for losses due to elbows or fitting. See the Long Line Guideline for details.
Maximum Total Equivalent Length
{
- Outdoor Unit BELOW Indoor Unit
Unit
Size
Liquid
Line
Diameter
w/ TXV
HP with R- 410A Refrigerant - Maximum Total Equivalent Length{
Vertical Separation ft (m) Outdoor unit BELOW indoor unit;
0-20
(0 - 6.1)
21- 30
(6.4 - 9.1)
31- 40
(9.4 - 12.2)
41- 50
(12.5 - 15.2)
51- 60
(15.5 - 18.3)
61- 70
(18.6 - 21.3)
71- 80
(21.6 - 24.4)
18
HP with
R- 410A
3/8 250* 250* 250* 250* 250* 250* 250*
24
HP with
R- 410A
3/8 250* 250* 250* 250* 250* 250* 250*
30
HP with
R- 410A
3/8 250* 250* 250* 250* 250* 250* 250*
36
HP with
R- 410A
3/8 250* 250* 250* 250* 250* 250* 250*
42
HP with
R- 410A
3/8 250* 250* 250* 250* 250* 250* 150
48
HP with
R- 410A
3/8 250* 250* 250* 250* 230 160 --
60
HP with
R- 410A
3/8 250* 225* 190 150 110 -- --
* Maximum actual length not to exceed 200 ft (61 m)
{ Total equivalent length accounts for losses due to elbows or fitting. See the Long Line Guideline for details.
- - = outside acceptable range
LONG LINE APPLICATIONS
An application is considered Long Line when the refrigerant level in the system requires the use of accessories to maintain acceptable
refrigerant management for systems reliability. Defining a system as long line depends on the liquid line diameter, actual length of the
tubing, and vertical separation between the indoor and outdoor units.
For Heat Pump systems, the chart below shows when an application is considered Long Line. Beyond these lengths, long line
accessories are required:
HP WITH R- 410A REFRIGERANT LONG LINE DESCRIPTION ft (m)
Beyond these lengths, long line accessories are required
Liquid Line Size Units On Same Level Outdoor Below Indoor Outdoor Above Indoor
3/8 80 (24.4) 20 (6.1) vertical or 80 (24.4) total 80 (24.4)
Note: See Long Line Guideline for details
CHARGING SUBCOOLING (TXV- TYPE EXPANSION DEVICE)
UNIT SIZE REQUIRED SUBCOOLING _F(_C)
18 8 (4.44)
24 7 (3.89)
30 7 (3.89)
36 10 (5.56)
42 9 (5.00)
48 9 (5.00)
60 7 (3.89)