Ingersoll-Rand D1700IN, Руководство оператора

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8 Non-cycling Refrigerated Dryer
MODELS D1700IN, D2040IN, D2720IN, D3400IN, D4080IN
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7.5 CONTROLS
Ingersoll Rand Refrigerated Compressed Air Dryers are
equipped with a Microprocessor Controller. This advanced
microprocessor-based Controller has been engineered by
Ingersoll Rand for use with Ingersoll Rand Compressed Air
Dryers.
For Non-Cycling dryers, the Controller displays the
temperature of the air at the coldest point in the air stream,
providing an indication of the outlet pressure dew point of
the dryer. In addition, the Controller permits monitoring of
dryer parameters and enunciation of alarm conditions.
The list below summarize the features the Controller:
2 X 16 Character Backlit LCD Display - Easy-to-
read display provides continuous indication of
dryer default parameter. Standard backlight
permits viewing of critical information in low light
environments.
Electronic Drain with On/Off Time Adjustment:
Included with dryer is a solenoid drain valve. Control
of the open and close time of the valve is set via the
Controller.
Remote Start / Stop: The Controller offers a unique
remote start / stop feature. This feature allows the
dryer to be operated via a remote user-supplied
switch.
Remote Alarm Contact: Controller includes a remote
alarm contact to provide indication of any of the
dryers alarms described later in this manual. Contact
rated for 2A / 120V max.
The Controller features three levels of access. The default
level CUSTOMER MODE permits adjustment of dryer
parameters to address seasonal variations for drain. A
protected TECHNICIAN MODE permits access to and
manipulation of additional parameters to address the initial
machine set up. A password protected FACTORY MODE
is also included for use by Factory Service Personnel for
troubleshooting the dryer.
Ingersoll Rand non-cycling dryers include a Hot Gas By-Pass
Valve to maintain suction pressure and temperature. Refer
to Figures 2A and 2B. This valve is necessary during low load
applications to prevent freeze-up in the chiller section. The
normal suction pressure for no load conditions should never
drop below 72 psig. This setting may need adjustment to
match the load/ambient conditions encountered.
NOTICE
This adjustment is not a procedure covered under
warranty as it is typically required for application-
specific conditions.
For Hot Gas By-Pass Valve adjustment, note the following:
Turning the adjustment screw clockwise raises suction
pressure and exchanger temperature viewed from the
top of the adjustment screw.
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Turning the adjustment screw counter-clockwise
reduces suction pressure and exchanger temperature.
All adjustments should be made without air flow
(load) on the dryer.
FIgURE 2a - HOT gaS BYPaSS VaLVE
(D1700IN,D2030 IN, & D2720 IN)
FIgURE 2B - HOT gaS BYPaSS VaLVE
(D3400IN - D4800 IN)
CAUTION
Do not rotate Hot gas By-Pass Valve adjustment
fully clockwise. Full clockwise rotation may result in
refrigerant compressor damage. any suction pressure
setting above 90 psig is not recommended.
Ingersoll Rand air cooled models utilize a microprocessor-
controlled fan contactor to control the condensing
temperature. This contactor controls the condensing
temperature by cycling the fan based on refrigerant
discharge pressure. When the unit reaches 275 psig, the
microprocessor energizes the fan contactor that will run the
primary fan until the discharge pressure is reduced to 195
psig. Should the discharge pressure continue to rise, the
remaining fan(s) will energize at 335 psig and continue to
operate until the discharge pressure has been reduced to
235 psig.
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7.0 PRINCIPLES OF OPERaTION
ADJUSTMENT SCREW LOCKING
NUT
ADJUSTMENT SCREW
ADJUSTMENT SCREW