Xylem C-1500N DIAPHRAGM PUMPS - Manual (Page 8)

C-1500N C-1500N Page 8 Page 9
5.0 How To Operate The C-1500N
5.1 Adjusting the Pump Output- Standard models (fig. 5.1) - The C-1500N flow rate can be adjusted
within a range of 5% -100% of maximum output (20:1 turndown ration) by means of a mechanical, cam
type mechanism. The mechanism adjusts the pump’s stroke length to an infinite number of settings
within the flow range. Because the pump’s output is reduced by increasing the pressure of the system
being injected into, the amount of suction lift, and the viscosity of the fluid being injected, the pump
must be over-sized to allow for these factors. Sizing the pump to allow adjustment within the midrange
is preferred to maintain accuracy. Consult the factory for individual pump model output curve data.
To adjust the pump’s output:
1. With the pump running, loosen the set screw.
2. Turn the adjustment knob to the desired setting.
3. Re-tighten the set screw.
CAUTION
ADJUST WHILE RUNNING
DISCHARGE LINES MAY BE UNDER
HIGH PRESSURE. USE CARE TO
PROTECT YOURSELF WHEN
DISCONNECTING.
MAX MIN
1
2
3
4
5
6
7
8
9
LOOSEN THE LOCK SCREW
TURN KNOB TO DESIRED SETTING
RE-TIGHTEN THE LOCK SCREW
5.3 Measuring the Pump’s Output - Volumetric Test.
This volumetric test will take into account individual installation factors such as line pressure, fluid
viscosity, suction lift, etc. This test is the most accurate for measuring the injector’s output in an individ-
ual installation.
1. Be sure the Injection Fitting and Footvalve/Strainer is clean and working properly.
2. With the injector installed under normal operating conditions, place the Footvalve/Strainer in a large
graduated cylinder.
3. Fill the graduated cylinder with the solution to be injected and run the injector until all air is removed
from the suction line and the solution enters the discharge tubing.
4. Refill the graduated cylinder, if necessary, and with the Footvalve completely submerged in the
solution, note the amount of solution in the graduated cylinder.
5. Run the injector for a measured amount of time and note the amount of fluid injected. A longer testing
time will produce more accurate results.
6.0 How to Maintain the C-1500N
6.1 Routine Inspection and Maintenance
The C-1500N requires very little maintenance. However, the pump and all accessories should be
checked regularly. This is especially important when pumping chemicals. Inspect all components for
signs of leaking, swelling, cracking, discoloration or corrosion. Replace worn or damaged components
immediately.
Cracking, crazing, discoloration and the like during the first week of operation are signs of severe
chemical attack. If this occurs, immediately remove the chemical from the pump. Determine which
parts are being attacked and replace them with parts that have been manufactured using more suitable
materials. The manufacturer does not assume responsibility for damage to the pump that has been
caused by chemical attack.
6.2 How to Clean the C-1500N
The C-1500N will require occasional cleaning, especially the Injection fitting, the Footvalve/Strainer,
and the pump head valves. The frequency will depend on the type and severity of service..
]
When changing the diaphragm, the pump head chamber and pump head cover should be wiped free of
any dirt and debris.
]
Periodically clean the injection/check valve assembly, especially when injecting fluids that calcify such
as sodium hypochlorite. These lime deposits and other build ups can clog the fitting, increase the back
pressure and interfere with the check valve operation. See section 4.3.4. Fig. 4.8.
]
Periodically clean the suction strainer. Fig.4.7
]
Periodically inspect the air vents located under the motor compartment and under the pump head. Clean
if necessary.
5.2 Adjusting the Pump Output - DELUXE Models (fig. 5.2)
In addition to the cam type mechanism adjustment (section 5.1), the pump output of the C-1500N deluxe
unit equipped with an optional electronic cycle timer board can also be fine tuned by adjusting the timer
adjustment knob. The total-time cycle is factory preset and is not user adjustable. The on-time cycle is
adjustable from 5% to 100% of the total cycle time. Example: If the total-time cycle is 5 seconds and the
on-time cycle is adjusted for 20 percent, the pump will run for 1 second and turn off for 4 seconds (5
second total cycle). This cycle is repeated until either the cycle time is changed or the input power is
disconnected from the pump.
Note: When the input power is disconnected from the C-1500N, the unit will maintain the last
adjusted settings. When power is restored to the pump, the C-1500N will begin to pump using the
last time cycle setting.
Junction Box
Cycle Timer
Adjustment Knob
FIG. 5.2
To adjust the On-Time :
Turn the timer adjustment knob located on the
junction box cover.
Clockwise increases the time on.
FIG. 5.1
Adjustment Knob
(Cam Type Mechanism)