3.0 OPERATION
3.1 Priming
CAUTION
:
With enough leverage, the stroke length knob on the EHE pumps can be
forced above 100% (by breaking the stop pin). This will damage the pump and will void
the warranty.
Install the pump as described above. With the pump plugged in but not pumping, set
stroke length at 100% and frequency at 360 (use the
¿
or
À
buttons as necessary to adjust
the frequency). Disconnect the discharge tubing from the injection valve. Push the
START/STOP
button to start the pump.
As soon as
liquid enters the discharge tubing at the
pump head, push the
START/STOP
button again to stop the pump. Reconnect the
discharge tubing to the injection valve.
If the pump does not self prime, remove the check valve housing on the discharge and
suction sides to make sure the valve cartridges and gaskets are in correct positions (see
Section 4.2). Remove and shake cartridges to make sure ball is loose inside. Wetting
cartridges before re-installing will help in priming.
3.2 Adjustment
The pump will operate best with the stroke length at 100%. If less than full output is
required, set the frequency to the desired percentage of maximum.
Example: Model EHE30E1-VC has maximum output of 5.5 GPH.
Desired output is 4.0 GPH.
4.0 ÷ 5.5 = 0.73 or 73%. 73% of 360 is 263.
Press the
¿
or
À
buttons as necessary to set the frequency to 263.
If very low outputs are required, it will be necessary to also reduce the stroke length.
(Minimum recommended stroke length is 20%.)
3.3 Calibration
If exact output calibration is required,
first prime and adjust the pump as above.
Then connect a calibration column to the
suction side of the pump. Turn the pump
on for one minute and read the amount of
liquid pumped from the column. Adjust the
frequency up or down as necessary and check
the output again. When the desired output is
reached, disconnect the calibration column and
reconnect the suction tubing. (See Figure 7.)
Figure 7
Calibration
10
