Specifications

d. HIGH SIDE
-
lower
pressure
LOW SIDE
-
in vacuum
WATTAGE
-
lower than
normal
The system is
probably
restricted
at
the
entrance of the
capillary tube. High
side
pressures
will take much longer
than
the
prescribed
7 to
10 minutes to
unload and balance with
the low side
after the compressor is
stopped.
e. HIGH
SIDE
-
higher
pressure
LOW SIDE
-
near normal
pressure
WATTAGE
-
higher than normal
These
findings indicate
air
in the
sys-
tem.
This is usually
the result
of a
low
side leak
being repaired
without the
system
being
thoroughly
purged
and
evacuated
before
recharging.
To
confirm the
existence
of air
in
the
system, check the temperatures
of the
condenser inlet
hnd
outlet. During
normal
operation,
the outlet
should be
from
15 to 20
degrees
colder than the
inlet. lf these
temperatures
do
not
vary
at least 15
degrees, the
presence
of air
is
almost certain.
Simply
purging
the
air
from the
system
is not
practical.
This
may result in
the
system
being
undercharged
due
to
the
loss
of
ref rigerant.
Purge, replace
drier,
evacuate,
and
recharge
the
sys-
tem.
f. HIGH
SIDE
-
higher
pressure
LOW
SIDE
-
higher
pressure
WATTAGE
-
higher than
normal
These
gauge
readings
usually indicate
an overcharge
of refrigerant.
The
ex-
tent
of the
pressure
increase
depends
on the amount
of
overcharge and room
temperature.
A
slight overcharge
may
not
cause trouble
in 70
degree tem-
peratures
whereas
in
90 degree tem-
peratures
a considerable
rise in
pressure
will result.
An
overcharge
may also
cause the
suction line to
be frosted
during the
run cycle.
Evacuate
and recharge
if
the system
is
overcharged.
g.
HIGH
SIDE
-
lower than normal
LOW
SIDE
-
higher
than normal
WATTAGE
-
lower
than normal
These
results indicate
an inefficient
compressor.
All
cooling surfaces
may
be covered
with
a
thin
film of frost,
but
the temperature
will
not descend to
cut
off
temperature
of the control,
even
with
continuous running.
Also the
con-
denser
will be noticeably
cooler to the
touch than
normal.
Once the confir-
mation
of
an
inefficient
compressor is
determined, it
should
be replaced.
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