Sullair RD Series, User & Service Manual

Page: 35 / 268

SECTION 2 RH SERIES—HIGH TEMPERATURE
35
Water in system Clogged condenser fins Clean fins of all obstruc-
tions The clogged fins in the condenser will
restrict air passage and reduce refrig-
erant capacity causing water down-
stream.
Fins should be periodically checked
and cleaned
Shortage of refrigerant Fix the leak and add a
charge of refrigerant Loss of refrigerant will cause improper
functioning.
A qualified refrigeration specialist
should perform the necessary repairs,
or factory should be contacted if the
units is in warranty
Refrigeration system is
not functioning Double check if the
refrigerant compressor is
running To check if the compressor is running,
check compressor-on light.
It is possible for the fan to be operat-
ing but not the compressor.
Compressor not running can be
caused by several factors. A qualified
refrigerant technician should check all
refrigerant and electrical controls
Excessive pressure dew
point Readjust refrigerant
evaporating pressure The refrigerant pressure adjustment
valve is identified by a label.
Turning the adjustment screw coun-
terclockwise will decrease the refrig-
erant pressure and lower the dew
point.
Adjust valves in ¼ turn increments to
allow 15 minutes for pressure stabili-
zation with full air flowing. Be sure that
gauge indicates that pressure stays in
green zone
High pressure drop Excessive compressed
air flow or too low air inlet
pressure Check actual pressure
and flow through the
dryer This dryer is designed for a maximum
air flow. If too much air is pumped into
the dryer, water removal capacity may
not be sufficient, resulting in liquid
carryover downstream. Check the
rated output of the air compressor
Freeze up Ensure that the operat-
ing room temperature is
above 41°F/5°C
Readjust refrigeration
controls Frosting of the lines is an indication
that controls are set too low.
Controls may be adjusted in the field
by means of the hot gas bypass valve.
Turn the screw clockwise to increase
refrigerant pressure setting which will
increase pressure dew point.
Turn screw in ¼ turn increments until
frost disappears. Allow 15 minutes for
pressure stabilization with air flowing
Clogged heat exchanger Clean heat exchanger
with a reverse air flow
Dryers are supposed to be used with
compressed air free of any aggressive
contaminants. Some contaminants
and impurities may require a special
heat exchanger. Contact your dealer
with your application details.
PROBLEM POSSIBLE CAUSE REPAIR COMMENTS