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• Scroll Condensing Unit • JEHSCU
• Scroll Condensing Unit • JEHSCU
18
9
Installation & Commissioning
Installation Clearance
•
The installation location should allo
w
su
ff
icient space
f
or air
f
lo
w
and maintenance around the unit.
•
To allo
w
su
ff
icient space
f
or doing service or installation.
Field Piping
Important Note
Line sizing should only be determined by quali
f
ied personnel.
A
ll local codes o
f
practice must be observed in the installation o
f
re
f
rigerant piping
To ensure satis
f
actory operation and per
f
ormance, the
f
ollo
w
ing points should be noted
f
or
f
ield piping arrangements,
•
Couples one indoor unit
w
ith one outdoor condensing unit only.
•
Release all the pre-charged nitrogen be
f
ore pipe
w
or
k
connection.
•
Connecting pipe size
f
or suction and liquid line must same as attaches to the condensing unit. Correct line sizing
w
ill minimize the pressure drop
and maintain su
ff
icient gas velocity
f
or proper oil return.
•
Pipe
w
or
k
routes must be as simple and as short as possible.
A
void lo
w
points on pipe
w
or
k
w
here oil can accumulate.
•
Use only clean, dehydrated re
f
rigeration grade copper tube
w
ith large radius elbo
w
s. The piping shall be
k
ept
w
ith enough bending radius.
•
Braze
w
ithout over
f
illing to ensure there is no excess solder into the tube.
•
To prevent oxidation, blo
w
nitrogen through pipe
w
or
k
w
hen brazing.
•
Install insulation on all suction lines a
f
ter pressure test.
•
A
dequately support all pipe
w
or
k
at a maximum o
f
2 meter intervals.
•
For the condition
w
here the outdoor condensing unit is above the indoor unit, the height di
ff
erence bet
w
een units shall be less than 25 m and install
oil trap on suction pipe every 4 m height. The suction pipe must al
w
ays be
f
itted
w
ith U-trap at the bottom.
•
For the condition
w
here the outdoor condensing unit is belo
w
the indoor unit, the height di
ff
erence bet
w
een units shall be less than 4 m. Pipe trap
shall be installed up
w
ard on outlet o
f
indoor unit (suction pipe).
•
The recommended piping length is 25 m or less.
•
In horizontal pipe
w
or
k
, suction pipe is not required any liquid trap.
•
A
dditional oil might be required i
f
piping length exceeds 20m or
w
ith many oil traps. Chec
k
the oil level o
f
the compressor to decide to add the oil
a
f
ter minimum 2 hours operation.
•
For systems operating
w
ith lo
w
evaporating temperature units (eg. JEHSCUXXXXLX),
w
e recommend using an expansion valve
f
itted
w
ith MOP
(Maximum Operation Pressure), to protect the compressor against high pressures in suction during the start procedure especially a
f
ter de
f
rosts
cycle.
Nevertheless, it is recommended as
w
ell to install the MOP (Maximum Operation Pressure), expansion valve
f
or medium evaporating temperature
units (eg. JEHSCUXXXXMX) i
f
the
w
or
k
ing suction pressure during start procedure especially a
f
ter de
f
rost cycle, is out o
f
the limit, as re
f
er to the table
provided.
EE
D
E
N
1
3
-
780A
_
Scro
ll
Condensing
U
nits
- JEH
SC
U.p
d
f 2
0
30
/
0
4/2
0
1
3
16:11:11