Ingersoll-Rand R Series, Инструкция по установке, эксплуатации и обслуживанию

Страница: 11 / 77

11
• We recommend that you increase the superheat setting
of the new valve about 5º F from the factory setting.
Turning the stem 2 turns in should be sufficient.
• Position the sensing bulb of the new valve just where
the old one was. It is crucial that the suction line be
clean and the bulb well insulated.
Solenoid Valves : The suction solenoid valve rarely causes
any trouble because the pressure difference across it is
never great. Unloader solenoids operate with greater
differentials. The VCD Dryer uses valves with a rated life of
more than two million operations. When they finally wear
out, the usual symptom is failure to close. The valves can
usually be restored by installing a diaphragm repair kit
available from IR.
Drains
The draining of water from the separator is the most crucial
part of the whole process. A complaint of “there’s more
water in the air now than there was before the dryer was
installed” is usually a drain problem.
The VCD Dryer has a demand operated drain. Operate the
drain manually and be sure that air blows out of the drain
line. Clean the strainer and solenoid valve if not.
The MRD demand Drain has a SINGLE point hermetically
sealed float switch. This extremely simple mechanism
resists fouling and wear.
Normally a single point drain will not work because the
switch would be constantly short cycling on/off and the
solenoid or switch would fail, —but the MRD Solved the
problem with timed electronic delay that allows the drain to
empty the vessel without loss of Compressed air.
Caution – Warning: remove all pressure before servicing
drain. Remove all air pressure and disconnect electrical
power from the drain
The MRD is easily disassembled for cleaning by removing
the four main bolts.
Yearly (or sooner) disassemble and clean vessel.
After disassembly be sure the float switch is mounted in the
same position (check arrow on float)
The dew point temperature is sensed by a sensing probe
inserted in one of the evaporator tubes. When air passes
over the probe, the air temperature controls the dew point
normally. When there is little or no air flow, the controller
sees the evaporator temperature and is able to prevent it
from going below freezing.
A malfunction of the control system can be suspected if:
1) Suction pressure is very low even when controller reads
over the set point or unit appears to be pumped down
and stopped when it shouldn’t be.
2) Water freezes in the evaporator causing air pressure
drop.
3) There is erratic or out-of-range indication of dew point.
This is controller or sensor trouble. Consult factory for
details
4) Dryer won’t restart after you stopped it for a test. This is
normal if you stopped when it was below setpoint. It will
restart when the dew point temperature comes above the
controller setting.
Factory Assistance
Please do not hesitate to call the Ingersoll-Rand factory for
technical information and assistance. We have skilled
troubleshooting and engineering personnel who are thor-
oughly familiar with the equipment. A short call may save a
long troubleshooting experience. Call 1-800-526-3615.
Instructions for Ordering Parts
All parts orders should be placed with your local Ingersoll-
Rand Service provider.
When ordering parts specify dryer model and serial number
(See nameplate on unit). Please call 1-800-526-3615.