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HEAT
PUM
P
WATE
R
HEATER
COMP
RE
SSO
R
CR
ITERIA
PAGE:
9/
30
14
I
mpurities
in
refrigerating system
( 1)
The
we
ight of
residue
on the
inside
surface of the heat
exchanger and tube
should
be
l
ess
than
0.
Olg/
m
2
•
But
metallic
dust should
not
be
permitted
in
the
system.
Thi
s
val
ue means
the
wei
ght
of
foreign residue col
l
ected by
filer
paper after
washing inside
surface of
the
heat exchanger tubes
with
R-
11.
(2)
Prevent the impurities from entering
into
the enclosed unit
system used
R410A.
When
the
impurities
entered into the enclosed
system,
it
will damage the
moving mechanism parts and
resul
t
in the
cap illary
depositing.
(3)
El
iminate all
system
contaminants
such
as
trichl
orethyl
ene, a
l
kalies,
soaps, oi
l
,
acids
&
washing
flui
d
used at machining heat exchanger and tubes.
15
Compressor
vacuum
operation
Compressor
shoul
d
never be
operated wh
ile
under
vacuum.
Otherwise,
internal
arcing can
cause
damaging
parts.
16 The compressor
shoul
d be
operated
f or
more
than 20 seconds
wi
th
in
15
minutes
af
ter charging
refrigerant into the
system so
proper
lubricat
ion
resul
ts.
17
Liquid
refrigerant
return
limitations
(1)
Liquid refrigerant
l
eve
l
in
s-
tank
shoul
d be
l
ower
than
the top
of
s-
pipe in
s-
tank.
(see chart at
right)
(2)
There
shoul
d
not exist noise
of
the liquid
refrigerant
compression, current and
vi
brancy
increase.
System
can append the assistant
stank
or reduce the amount
of
refri
gerant
to
prevent
from
liquid
refrigerant
compression.
Refrigerant
system
forbid
liquid
refrigerant
fr
om
flowing
back
compressor in any
case.
In
normal
condition
the
overheat
gas
refrigerant
shoul
d
f
l
ow back compressor
.
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