Chemtrol PC3000 - Volume of Water; Volume or Pressure Differential; Volume and Pressure Differential; Safety Shutoff

MANUALPC-2010 CHAPTER IV - OPERATION Page 46
7.1.6 – Volume of Water
This option causes a backwash cycle to be initiated when the
volume of water accumulated since the last backwash exceeds
the set amount. The default value 0 disables the function.
7.1.7 – Volume or Pressure Differential
This option causes a backwash cycle to be initiated when
EITHER the specified volume of water has accumulated OR
the specified difference between the influent and effluent
pressures exceeds the set amount.
7.1.8 - Volume and Pressure Differential
This option causes a backwash cycle to be initiated when
BOTH the specified volume of water has accumulated AND the
specified difference between the INFLUENT and EFFLUENT
pressures exceeds the set amount.
Safety Shutoff
NOTE: 7.1.2, 7.1.3, 7.1.4, 7.1.7 and 7.1.8: if the
pressure differential at the end of the backwash
cycle + 3 minutes is not restored to normal clean
filter operation, the Filter control mode will be
turned to OFF.
NOTE: 7.1.5: if the flow rate at the end of the
backwash cycle + 3 minutes is not restored to
normal clean filter operation, the Filter control mode
will be turned to OFF.
7.6 - Priority Valve
A Priority Valve can be specified in Submenu 7.6 to allow
backwashing of the filters with clean water, as shown in Figure
28.
7.7 - Pump Shutdown
If set to YES, the Main Pump will be shut down if the flow rate
at the end of the Backwash Cycle + 3 minutes is not restored
to or above its initial value before backwash.
7.8 - Pump Override
The PUMP OVERRIDE option is used to shut off the main
pump during cycling of the backwash valves. This is sometime
recommended to reduce pressure on the valves.
The minimum default value is 5 seconds, which shuts the
pump for a total of 10 seconds (5 seconds before start of valve
cycling to reduce flow and 5 seconds after to cycle valves).
Submenu 7.1.6
Submenu 7.1.7
Submenu 7.1.8
Submenu 7.8
VOLUME OF WATER
Backwash starts when
Volume of water accumulated
since last backwash
exceeds: 300,000 Gal
VOLUME OR PRESSURE
Backwash starts when
either Volume OR
Pressure Differential
is reached.
Volume (Gal): 300,000
Difference (psi):
5
VOLUME AND PRESSURE
Backwash starts when
both Volume AND
Pressure Differential
are reached.
Volume (Gal): 300,000
Difference (psi):
5
PUMP OVERRIDE
Stop pump before changing
backwash valves ?
YES NO
Time for valve motion
(min 5 sec)
10