MT Series DryLine
®
Dehydrator User Manual
14
Pressure Monitoring and Control
Pressure Monitoring Points
Dehydrator output pressure is monitored at the
transmission line on all models by the “Remote
Sense” port on the top of the unit.
CAUTION:
Do not operate the unit without the
Remote Sense line connected, this
may cause an over pressure condition
that may damage the waveguide.
Dehydrator Duty Cycles
The dehydrator is programmed at the factory to
start when the output pressure of the dehydrator
drops to 3 kPa (1 lb/in2) and stops when the
pressure reaches 28 kPa (4 lb/in2). That is the
recommended pressure range for most antenna
and transmission line components, which have a
rating of 35 kPa (5 lb/in2).
Some system components, however, have
lower pressure ratings. If this is the case please
contact CommScope Customer service.
Hour Meter Display. This shows the total
run time for the compressor since it left the
factory. The total run time should be monitored
to determine the duty cycle of the dehydrator
and for compressor maintenance scheduling.
No adjustments are necessary and none are
provided.
Alarm Conditions
Alarm conditions, except Excess Run, are
factory set and cannot be altered. Alarm
contacts are included in the unit and wiring
terminals are located on the inside of the door.
When an alarm condition exists, the normally
open contacts are closed, thereby activating
a remote alarm (not included). Also the alarm
condition will be displayed on the series of LEDs
on the front panel
Excess Run Time Alarm Setting JP1. The
dehydrator will signal an alarm condition
when the dehydrator operates longer than the
selected, in minutes. The alarm indicates that
there is either a substantial leak in the system or
that the dehydrator is not supplying a sufficient
volume of dry air. The initial factory setting is
120 minutes. The alarm should be set for a time
about twice the anticipated normal running time.
NOTE:
To clear the Excess Run alarm turn the
power off and then on.
When removing your dehydrator from service,
you may need a substitute dry air source. Call
CommScope Technical Service. Telephone
numbers are listed in Section 9.
Before turning off the unit, notify personnel that
alarms may be activated.
To shut down the MT Series unit, turn the ON-
OFF power switch to the OFF position and close
the isolation shutoff valves located in the output /
input lines to retain system pressure.
Disconnect by unscrewing the poly tube
compression fittings located at the top of the
unit.
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