SPX MARLEY LLC, User Manual, Page: 5 / 48

5
description
The Liquid Level Control systems are used to accomplish
five different functions:
• Water Makeup • High Water Alarm
• Low Water Alarm • High Water Cutoff
• Low Water Cutoff
The most common application of a water level control
system is water makeup. The system regulates the amount
of water in the tower basin and keeps it within normal
operating levels. This makeup system is used to control
a remotely installed water solenoid valve. When the water
level drops below a prescribed, preset level, the solenoid
valve is energized by the control system to fill the basin
to its proper level.
LLC
Control Panel
Probe
System
30'-0 Lead
High and low cut-off dry contacts
High and low alarm dry contacts
MU powered with 120V
Solenoid
Pump
Pump
BMS
Stilling
Chamber
Basin Floor
6amp 120/1/60
Utility Supply
Junction Box
by others if required
Extension
if required
Display
SYSTEM DIAGRAM
LLC Components
Optional Field Components—by others
High and low water alarms can be utilized to give warn-
ings associated with abnormal operating water levels. To
provide indication of these types of alerts, the control sys-
tem provides dry contacts to interface with various digital
control systems or can be connected to user supplied alarm
indicators to signal when corrective action is required.
Low-water cutoffs are commonly used to protect pumps
from operating without sufficient water. When used in
unattended operating environments, the low-water cutoff
is configured to shut the pump off, thus preventing costly
repairs. Dry contacts can be wired directly in series with
pilot duty controls or to digital control systems to initiate
the shutdown of protected equipment during low-water
situations.