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HEAT PUMP
WATER
HEATER
COMPRESSOR
CRI
TE
RI
A
PAGE
:
8/
30
8
Discharge
pi
pe
temper ature
Discharge
pi
pe
temper ature i
s
measured
at
a
di
stance 300mm from the
surf
ace of
compressor
and
should
be
less than
llo
·c
.
The
tip
of the thermocouple
i
s
fixed
by
sol
dering when
measuring
di schar
ge
pipe temper ature
.
Furthermore,
so
l
dering
point
i
s
covered
wi
th urethane
foam to
prevent the
effect
of
wi nd.
9 Dust
of
compressor hermetic
termi
nals
Compressor hermet
ic
terminal
s should
be mounted
wi
th spec ified
cover i
n right way to
prevent
dust
entering, and
shoul
d be used
in
direction which
dust is hard
to
enter
i n.
10
Lead
wire of
compressor hermetic
termi
nals
Measuring
the temperature
of
hermetic
terminal
s , lead
wire
should be
resist to
the temperature
and
be clamped so as not
in touch
wi
th
the
surface
of
compressor
and
pipe.
11 Star
t
-
stop
fre
quency
The frequency
should
be
less
than 6
times
per
hour.
Operating
time
from
start to stop
shoul
d
be more
than
3 minutes.
Stopping
time
shoul
d be
more
than
3minutes.
12 Rate of
r
otat
ional
speed change
The
rate
of compressor r
otat
ional
speed
(acceler
at
ion)
should
be
less
than
133min-'/
s,
But
if
The
var
i
abl
e
r
ange
is be
l
ow
120min-',
rate can a
l
so
be
less
than
600min-'
when
r otational
speed
i
s
reduced to avoid
tempor
ary
over-
current.
13 Air
and moisture
in refriger
at ing system
The
degree of vacuum
i
n refrigerating system
should
be
less than 20Pa
(150X10-
3
mmHg)
at
r
oom
temper ature j
ust
before char
ging
refriger
ant.
The quant ity
of
water
should
be
less
than 0. 15ml.
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