MANOWNROSM
INTRODUCTION
US Filter
5
Product recirculation permits excess product water to be returned to the inlet of
the high pressure pump. This function is used when capacity exceeds demand,
conserving water and increasing percent rejection (water quality).
I.
Autoflush (Optional)
In the TANK FEED and STANDBY modes, an optional solid state timer
automatically opens the reject solenoid valve for one minute every hour,
bypassing the throttle valve. This flush cycle is programmable for 1, 2, or 4
minutes per hour as determined by the fouling characteristics of the feedwater.
In the DIRECT FEED mode the autoflush function is inhibited.
J.
Controller
The controller has the following capabilities:
1.
Low pressure shutdown - The pump motor is shut down when the inlet
water pressure falls below 0.69 bar (10 psi). There is a 3 second delay to
prevent shutdown during momentary pressure losses.
2.
High pressure shutdown - The pump motor is shut down when the
pressure exceeds a set point (determined by the choice of membranes)
to prevent damage to the pump or elements.
3.
High temperature shutdown - The pump motor is shut down on high
temperature to protect the RO membranes from exposure to damaging
temperatures.
4.
Low percent rejection alarm - The alarm function is activated when the
percent rejection falls below determined limits to warn the operator if the
product water quality no longer meets specifications.
5.
Pump startup delay - There is a ten second delay after turning on the unit
before the pump starts.
6.
Automatic flush - The system automatically flushes each hour when the
system is in the STANDBY mode or the TANK FEED mode.
7.
Tank full shutdown - The system goes into STANDBY when a signal from
a level switch indicates that a storage tank is full (optional).
8.
Interlock - This feature stops the system when the pretreatment
equipment is in the regeneration cycle and restarts the system
automatically when the regeneration cycle is completed.
K.
Accessories
In order to comply with AAMI standards for audible alarm capability, an
accessory audible alarm is necessary. This alarm can be remotely mounted
providing monitoring in an area away from the unit for safety and convenience. If
the system is used to feed a storage reservoir, a level switch is necessary to
provide a signal to the controller while in the TANK FEED mode.
L.
Water Quality Monitor
The controller is designed to measure the conductivity of the feedwater to the
system as well as the conductivity of the product water. It automatically
calculates the percent of impurities being rejected by the RO membranes. The
