OPERATION
LAB STORAGE TANKS
11
98-0123 Rev E
5
OPERATION
The distribution pump will operate on a constant curve based on the run percentage "SETPOINT", any
unused water will recirculate back to the storage tank (see Section 4.1.1 to adjust the "SETPOINT"). The
tanks are equipped with a recirculation header that contains a pressure relief valve, spray bar, dump
valve, pressure gauge, temperature gauge, and sample port. The pressure relief valve works to maintain
water pressure under its set-point. The spray bar returns water from the distribution loop back to the
storage tank using spray nozzles to prevent stagnant water.
The laboratory storage tanks are equipped with three float switches: high-level, mid-level, and base-level.
All three float switches are close on rise and the high and mid-level floats tie into the RO. The high-level
float closing turns off the RO, while the mid-level float opening turns the RO on to request more water.
The base-level float connects to the CME distribution pump to act as a kill switch to prevent the pump
from operating when there is no water (running dry).
All CME pumps provided from AmeriWater have been factory set to control mode “Controlled” (see
paragraph below) and have been programmed to operate on a constant curve at the rated flow
mentioned previously. These models also use a pressure transducer to monitor the discharge pressure
during operation. The transducer allows the pump to recognize when the pump is operating under a dead
head condition (no water usage). Under this condition, the pump will shut off based on a maximum
pressure limit allowed at the pump discharge. To increase or decrease the speed at which the pump
operates, follow steps outlined in Section 4.1.1. The number of starts and stops via the power supply
must not exceed four times per hour. When switched on via the power supply, the pump starts after
approximately five seconds.
NOTE:
All changes to set-points are possible with the pump operating.
In control mode “Controlled,” the pump will adjust its performance, i.e., pump discharge pressure, to the
desired set-point for the control parameter. In control mode “Uncontrolled,” the pump will operate
according to the constant curve set.
5.1
Grundfos® CME 5-3 Control
Control Panel
Figure 2 – CME 5-3 Control Panel
Control panels functions are described in the table below (reference Figure 2
for Position number):
Pos.
Symbol
Description
Summary of Contents for 00HC-4090
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Page 15: ...OPERATION LAB STORAGE TANKS 13 98 0123 Rev E Figure 3 Grundfos Eye Indicators...
Page 16: ...OPERATION LAB STORAGE TANKS 14 98 0123 Rev E 5 2 Default Pump Program...
Page 28: ...REPLACEMENT PARTS LAB STORAGE TANKS 26 98 0123 Rev E 11 REPLACEMENT PARTS...
