Concealed Ducted Air Handler Installation Manual
Oblique RoughW
arped
90
°
Fig 5.1
Refrigerant Piping
Connection
Page 23
Revised 5/14/2020
Be extra careful not to damage, dent, or deform the pipe while cutting. This will drastically reduce the
heating eciency of the unit.
DO NOT DEFORM PIPE WHILE CUTTING
If the outdoor unit is installed higher than the indoor unit:
-It is recommended that vertical suction risers not be upsized. Proper oil return to the
compressor should be maintained with suction gas velocity. If velocities drop below 1500fpm
(feet per minute), oil return will be decreased. An oil trap should be installed every 20ft of vertical
suction line riser.
CAUTION
The outdoor unit is installed higher than the
indoor unit
Indoor unit
Outdoor unit
Gas piping
Oil trap
20 ft
20 ft
Liquid
piping
Connection Instructions – Refrigerant Piping
Step 1: Cut pipes
When preparing refrigerant pipes, take extra care
to cut and are them properly. This will ensure
ecient operation and minimize the need for
future maintenance.
1. Measure the distance between the indoor and
outdoor units.
2. Using a pipe cutter, cut the pipe a little longer
than the measured distance.
3. Make sure that the pipe is cut at a perfect 90°
angle. Refer to Fig. 5.1 for bad cut examples.