ZEKS CFX NC Series, Technical Manual

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For NonCycling dryers, the DPC™ diplays 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 DPC™ permits monitoring of dryer parameters and enuncia-
tion of alarm conditions.
The list below summarize the features the DPC™:
• 1 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 DPC™-equipped
HeatSink™ and NonCycle dryers is a solenoid drain valve. Control of the open and
close time of the valve is set via the DPC™ Controller.
• Remote Start / Stop: DPC™-equipped dryers offer a unique remote start / stop
feature. This feature allows the dryer to be operated via a remote user-supplied
switch.
• Remote Alarm Contact: DPC™-equipped dryers include 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 DPC™ Controller features three levels of access. The default level CUSTOMER
MODE permits adjustment of dryer parameters to address seasonal variations for
drain timing. 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 ZEKS Service Personnel for
troubleshooting the dryer.
All ZEKS Non-Cycling dryers include a Hot Gas By-Pass (HGBP) Valve to maintain
suction pressure and temperature. 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 76 psig.
* This setting may need adjustment to
match the load/ambient conditions encountered.
*This adjustment is not a procedure covered under warranty as it is typically required for applica-
tion specific conditions.
FIGURE 2 - HGBP VALVE
For HGBP Valve adjustment note the following:
• Turning the adjustment screw clockwise raises
suction pressure and exchanger temperature.
• Turning the adjustment screw counter-clockwise
reduces suction pressure and exchanger tempera-
ture.
• All adjustments should be made without air flow
(load) on the dryer.