A
B
max. 4 m
U-trap
max. 4 m
4m/s or more
Evaporator
8 to 12 m/s
4 m/s or more
0.5% slope
0.5% slope
Fig. 1
Fig. 2
Fig. 3
4 Cyl.
1 & 2 Cyl.
Fig. 4
IN
OUT
Fig 5
Fig 5
Fig 6
A
B
C
max. 4 m
8510223 P01-A © Danfoss Commercial Compressors March 2006
Instructions
Short frequency converter recommendations
Application Envelopes
Suction riser dimension
Suction pipe selection
VTZ038 VTZ054 VTZ086 VTZ121 VTZ171 VTZ215 VTZ242
R404A
-10/+45°C
Mini riser (A)
1/2"
1/2"
5/8"
3/4"
7/8"
1"1/8
1"1/8
Max riser (B)
5/8"
3/4"
7/8"
1"1/8
1"3/8
1"3/8
1"3/8
Suct. Header (C)
3/4"
7/8"
1"1/8
1"3/8
1"5/8
1"5/8
1"5/8
d
d
d
d
.
175ZA786.1
0
• Installation
Make always sure that there is no possibility of
exhaust hot air by-pass from the drive. This will
lead to overheating thermal trip of the inverter.
The wiring of a variable speed system is to be
done in a very professional way.
The main precautions on assembly has to be
done in relation with the present drawings.
Generally speaking shielded cables have to be
used all over the frequency converter and va-
riable speed compressor, except network line to
frequency converter.
For the application envelopes of the different va-
riable speed compressors and applicable refrige-
rant refer to the Danfoss Commercial Compres-
sors dedicated application guidelines.
