10
Cold Weather Operation
The
TowerGuard
Series filter does not come freeze protected. It is preferable to install the system in a heated room
to prevent freezing. If this is not possible, the system should be properly protected with heat tape and insulation
around all of the liquid filled components. The filter should be completely drained when not in use to prevent
potential freeze damage.
Shutdown - For an extended length of time
Follow the procedure below when the system will be shut down for a prolonged time period.
1. Run the filter through a complete backflush cycle to clean the sand media.
2. Turn off the pump and the controller, making sure the system is in normal filtration mode when turned off. Shut
off and lock out all electrical power to the system.
3. Isolate the system by shutting off all valves that may allow water into the system. Open the air relief valve on top
of the filter housing. Drain the system allowing all water to drain by removing the drain plug on the bottom of the
filter. Replace the plug once the system is completely drained.
4. Remove the filter lid and inspect the over drain assembly. Remove any foreign material from the media.
Replace the media if necessary. Clean and lubricate the O-ring if necessary and reinstall the lid.
5. Close the air relief valve.
Recommended MAXIM Controller Settings
MAXIM
Controller - The controller should be monitored on a regular basis to make sure the system is operating
normally. See the
MAXIM
Controller Owner’s Manual in the following section for operating instructions. The
controllers initial settings are factory preset at average values and do not necessarily reflect the individual needs for
your system. Below are recommendations on how to adjust the controller to fit your system’s needs.
1) The Pressure Differential (PD) gauge setting should be properly set once there is water flow in normal filtration
mode. The recommended PD set point is 7.2 PSID above the “clean” gauge reading at the system’s MAXIMUM
flow rate. Typical PD gauge set points are between 12-15 PSID, depending on flow rate and filter size. Setting the
PD gauge too low will cause the system to backflush too often, resulting in significant water loss to drain. The
initial factory setting of the PD Gauge is 12PSID. See additional PD Gauge info on page 14.
2) The backflush frequency setting should be adjusted so the system backflushes by elapsed time just before the
system reaches it’s pressure differential set-point. If the system is installed on an older tower, you may find the
system backflushes frequently until the tower water has “cleaned up”. We recommend the user begin with a 24
hour backflush frequency setting. This can be adjusted depending upon how often the pressure differential
set-point is reached.
3)
The backflush duration recommended initial setting is 180 seconds. This may be increased or decreased de-
pending upon whether or not the backflush water is becoming clean by the end of the cycle. We do not however,
recommend ever adjusting this value below 90 seconds. Take note of the original “clean filter pressure differen-
tial”. When a backflush is complete, the Pressure Differential (PD) gauge reading should fall back to this level. If
it is not returning to this level, you may want to increase the backflush time. If the problem continues, inspect the
sand media and consider replacing it.
