Aircel DHT-100, Инструкция по установке и эксплуатации

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High Inlet Temperature Refrigerated Air Dryer
13
Preliminary Start-Up Checklist
Notice: For all models, wait at least 6 hours
after transporting or moving of dryer system
before starting the dryers. Turn the main power
switch to the dryer on, but do not turn
the dryer on/off switch to the on
position until 6 hours have passed. The
power indicating light will be on.
1. Check that the inlet and outlet connections
are the correct size and pressure rating, and
tightened securely.
2. Check that the correct power supply is
connected to the high inlet temperature series
refrigerated air dryer system with an adequate
disconnect switch.
3. Check that all compressed air line service valves
are open and that compressed air is available to
be supplied to the high inlet temperature series
refrigerated air dryer system.
4. Check that all liquid drain service valves are
open. This is to ensure that any residual bulk
condensate that may have accumulated in the
compressed air lines is discharged immediately
upon start up. These drains must be closed
once system is brought on line for use. The
drain valve on the refrigerated air dryer can be
opened by pushing the test button located on
the front control panel.
5. With the customer-supplied compressed air
to the system, OPEN the inlet valve slowly to
gradually pressurize the system. Do not open
valve too quickly. Opening valve and suddenly
pressurizing the system can cause damage to the
dryer heat exchanger and other components.
6. Check the complete air system piping
connections and dryer system connections for
leaks at this time. Repair and retest all leaks.
7. Verify that all instrumentation (pressure
gauge/s) and drain air tubing fittings are tight.
8. Ensure that the air system has come up to
full pressure and has filled the high inlet
temperature series refrigerated air dryer with
compressed air. Before opening the outlet valve
on the system and after the dryer has been
started under no load, let the dryer run for at
least fifteen (15) minutes to allow stabilization
of the system. Verify the following:
a. The dryer is designed to run continually
and should not be cycling on and off with
the air compressor. The non-cycling
operation of the dryer is controlled by an
automatic expansion valve or a thermostatic
expansion valve / hot gas by-pass valve. The
valves will open and close automatically
depending on the amount of heat load to the
evaporator, thus maintaining the desired
pressure dew point.
b. Check the inlet compressed air temperature
and pressure to the dryer and verify that it
meets the specified requirements.
c. Fan rotation, for dryers with an air-cooled
condenser, rotation should be in accordance
with the fan rotation shown on the details
located on top and back of the condenser.
Cooling air is drawn through the condenser
coils. If the motor rotation is not correct,
turn off the power switch and put the main
power supply disconnect in the “off”
position; lock and tag; check the wiring;
correct the wire lead locations; recheck for
correct rotation (3 phase unit only).
d. The refrigeration gauge readings should be as
follows:
• Refrigerant suction pressure R-134a
= 28-40 psig
• Refrigerant discharge pressure R-
134a = 160-250 psig
Notice: The above discharge pressures depend
upon ambient temperature and can
vary slightly according to temperature
fluctuations.
9. After all of the preliminary start up checklist