Owner: Jim Herrin
P.O. Box 161
5342 Rothenbuhler Road
Acme, WA 98220
Phone: 360-320-0309
FAX: 360-595-2825
Email: herrindesign@verizon.net
Well Control informational package in PDF format
Well Control Municipal Water System Level Control 1644
The Herrin Design Model 1644 Well Control is
designed to provide a cost effective means of
controlling water system reservoir levels.
Through precise monitoring, the Well Control is
able to reliably sense reservoir water levels by
measuring water pressure at the well head. By
monitoring reservoir levels at the well head, it is
possible to mount the water system controls in
one location, eliminating the costly
communications link--leased lines or buried
cables--between reservoir level sensors and the
pumps. Typically, mechanical sensors at the
reservoir deteriorate or are broken frequently
due to weather; and communications lines are a
large, continued expense.
The Well Control tolerates temporary variations
in water pressure due to surges and usage.
The pump will not start until there is a constant
low pressure level for 2-3 (variable) minutes
(OFF TIME). This insures the pumps are
activated only when necessary. Once the pump
is turned on, it remains on for a preset period of
time--up to 24 hours (ON TIME). During the
pump cycle, the control does not rely on water
pressure measurements to indicate if the
reservoir is full. This feature eliminates sporadic
pumping due to pressure variations created
during the pumping cycle.
This combination of exacting pressure sensors and precise timing provides a very economical means of controlling community water system reservoir levels.
Click here to see a photo of an actual well control installation
SYSTEM COMPONENTS
STANDARD FEATURES
SPECIFICATIONS
POWER REQUIREMENTS |
110VAC |
CASE DIMENSIONS: |
|
CONTROL OUTPUT |
Relay closure to energize
pump contactor (10A, 240 VAC max) |
CONTROL INPUT |
Pressure switch |
WARRANTY
The Herrin Design 1644 Well
Control is a quality product.
If proven to be defective in
workmanship or materials
within 2 years from the date
of purchase, it will be
repaired or replaced at the
manufacturer's option at the
factory. Warranty service on
your Herrin Design
equipment may be
performed only by an
authorized Herrin
Dealer Representative.
Unauthorized service procedures or parts will void and cancel your warranty.
This warranty is given in lieu of all other warranties, either expressed or implied, and neither seller nor manufacturer shall be liable for any direct, incidental or consequential loss or damage arising out of the failure of the product to operate.
More information about the Model 1644 Water System Level Control:
Installing and maintaining a tank or reservoir water level sensing device can be expensive for small community systems. The cost of maintaining underground wiring, leasing telephone lines or maintaining radio links can accumulate to significant cost levels in just a few years. The Model 1644 provides the means to reliably sense tank water level by measuring the water pressure at the well head. This gives the advantage of having all the controls for the water system in one place, eliminating the communication link between the reservoir and the pumps. With very little loss in accuracy, The Model 1644 Control uses accurate pressure sensing in combination with precise timing to provide a reliable, economical alternative for small community water systems.
OPERATION
The 1644 control monitors system water pressure using a high quality, tight deadband pressure switch. Variations in pressure resulting from usage and pumping surges are filtered out by an adjustable time delay that allows the 1644 to ignore these relatively short pressure variations. This time delay (OFF TIME) is typically set for three or four minutes but the setting will vary with system characteristics. When the system pressure drops below a preset limit the pressure switch alerts the 1644 control. The PSW indicator turns on. The control will start the pump when this low pressure alert exceeds the OFF TIME . The PMP indicator turns on for the duration of the pumping cycle.
PRESSURE SWITCH
Connect the NC and C terminals of the Pressure Switch to terminals 4 and 5 of the 1644 Control Box (non-polarized). Adjust the pressure by first pumping the reservoir full. At the full point the pressure adjustment is set so the pressure switch plunger is just depressed and the PSW indicator is off. To adjust this threshold point loosen the set screw below the 5/8" hex nut, then adjust the 5/8" hex nut slowly so that the switch is OFF(plunger depressed, PSW indicator on). There is some slack in the adjustment between ON and OFF. Set the adjustment for 1/2 the difference between ON and OFF. At this threshold point the indicator will flash on and off due to usage but it should be predominately off.
TIMER ADJUSTMENT
OFF TIME
During normal operation the pressure switch will click on and off due to pressure changes in the water system. The OFF TIME is a method of ignoring these normal oscillations. As the reservoir water level lowers, the pressure switch will stay on longer. Eventually, the pressure switch will stay on long enough to match the OFF TIME setting on the timer. At that point, the pump will be turned on.
If the OFF TIME is set too short, then the pump may turn on too early which will lead to overflow. If the time is too long the reservoir may drop below desired levels. A typical OFF TIME seems to be two to four minutes. You should be able to watch the system's pressure gauge whenever the pump turns off and observe the time it takes for the system to stabilize.
ON TIME
The ON TIME is the time that the pump runs. Knowing the pump GPM and the dimensions of the
reservoir you can calculate the time it would take to fill the tank from the turn on point established
in the PRESSURE SWITCH section. Or set this time by allowing the tank to drop enough to turn
the pump on and measure the time it takes to fill the reservoir. This is the ON TIME . If over fill is
a critical problem, establish this pumping time based on a low usage or no usage time (usually
early morning hours)
Owner: Jim Herrin
P.O. Box 161
5342 Rothenbuhler Road
Acme, WA 98220
Phone: 360-320-0309
FAX: 360-595-2825
Email: herrindesign@verizon.net