ClimaCool UCR 30, 50 and 70 tons Manual - Manual (Page 61)

61
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Pressure Diff erential Alarm Package Option
The pressure diff erential alarm option continually monitors
and displays the strainer’s inlet and outlet diff erential
pressure. When the strainer element (conical strainer
basket) becomes signifi cantly clogged, the pressure
diff erential switch-gauge will trigger an audible siren and
a visual fl ashing alarm light. These alarms are intended to
alert maintenance personnel that the strainer element must
be removed and cleaned (See page 59 - Strainer Element
Cleaning).
Figure 6
PSID High
PSID Low
PRESSURE DIFFERENTIAL ALARM PACKAGE
Alarm Reset Button
FRONT
VIEW
LEFT SIDE
VIEW
Power To ATF
110 Volt/12 Volt DC
Wall Transformer
Visual
Alarm
Audible
Alarm
Pressure Differential
Switch-Gauge
LED Power Indicator
Differential
Set-Point Contact
Cover-Plate Screw (4) in Corners of
Box (DO NOT REMOVE).
Visual
Alarm
RIGHT SIDE
VIEW
TOP
VIEW
BOTTOM
VIEW AUX Contacts
(On or Off with Alarm)
Red & Black
Cable Retainer
Operation Instructions
Remove the power supply and insert the connector end into
the socket on the bottom of the PDA housing (See Figure
6 above) and plug the transformer into the power source.
Standard systems are supplied with a 120V power supply to
the primary of the transformer, with an output secondary of
12 VDC. The pressure diff erential switch-gauge is factory set
to 7-8 PSI. The CS strainer operates at a pressure diff erential
slightly less that 1 PSI during maximum fl ow when the
strainer screen is clean. By the time the diff erential pressure
reaches 7-8 PSI, the strainer element will be signifi cantly
clogged and require immediate removal and cleaning. To
adjust the pressure diff erential switch-gauge setting, insert
a 1/16” allen wrench and rotate the diff erential set-point
contact to the desired location (See Figure 6).
Note: We do not recommend setting the diff erential switch-
gauge higher than 10 PSI. Disabling the alarm or increasing
the alarm set point could result in damage to the strainer
element and allow debris to pass into the system.
When the diff erential set point is reached both the audible
and visual alarms will be triggered and will remain engaged
until both the Alarm condition is corrected and the Alarm-
Reset button is pressed. (If the Alarm-Reset button is
pressed but the diff erential pressure is beyond the set point,
the alarms will re-engage immediately). After the strainer
is cleaned and put back in service, the diff erential pressure
should return to 1 PSI.
Auxiliary Contacts
The PDA option is equipped with a remote alarm feature.
The remote alarm contacts are located at the two Black &
Red Banana Clip Posts (See Figure 6). The alarm can be set
up in one of two ways: 1)a remote alarm signal of 12 VDC can
be sent to a central monitoring station or 2) a set of auxiliary
contacts will indicate a “closed” condition when the alarm
activates. (Locate the Auxiliary Contact Schematic inside the
PDA box by removing the four screws on the cover plate).
Water Resistance
The Pressure Diff erential Alarm Controller is water-resistant,
but not water proof. Do not install below ground level
where the box can be submerged in water. Do not remove
the cover plate from the PDA controller. Keep the cover
tightly sealed on the module during normal operation.
TroubleshooƟ ng for ATF Package
Problem SoluƟ on
• Valve is leaking past ball • Seals damaged or worn out • Install repair kit
• Valve is not stopping at proper closed posiƟ on • Adjust limit switches
• Valve Stem leaks • Worn stem seals • On metal valves: Ɵ ghten stem packing nut 1/2 turn.
CAUTION! Over Ɵ ghtening stem nut could cause drag on
motor and trip internal circuit breaker. May require repair kit
or new valve.
• Valve body leaks • Loose body bolts or excessive operaƟ on pressure • Check bolts and observe recommended pressure raƟ ngs
• DefecƟ ve seals • Install repair kits or new valve
• Valve hard to turn • Swollen seals or product buildup in valve chamber • Check valve for compaƟ bility with product, may require valve
cleaning or new valve
• Valve bolts too Ɵ ght • Loosen stem nut slightly
• Stem nut too Ɵ ght • Loosen stem nut slightly