Delavan 7800 Series - Manual (Page 4)

12 Volt DC Motor-Driven Diaphragm Pumps
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4
Installation and Operation
1. Turn off water supply.
2. Cut flexible tubing in sufficient length to avoid any stress on
the tubing where it connects to the pump or the fitting on any
accessory.
3. Insert tubing into pump ports. If fittings are John Guest type,
be sure tubing is inserted past the resistance point until it
bottoms out against the port stop. If compression fittings
with threaded nuts are used, insert tubing until it bottoms out
in the port and hand tighten the compression nut until the
connection is tight. Then use a wrench to tighten the nut 1/2
turn clockwise or follow the wrench tightening instructions
provided by the fitting manufacturer.
4. The pump is now ready for operation. Turn on water supply to
allow water to flow to the pump.
5. If the power source is a transformer, plug the appropriate
supplied/approved transformer into the receptacle and
connect the pump to the transformer. If the power source is
not a transformer, connect the pump to the appropriate power
source. Open the discharge or dispensing valve. Allow water
to circulate, purging any entrapped air.
6. The pump will now start building pressure. Operating pressure
will vary with flow rate, flow valve, feed-water pressure and line
voltage. Check for fitting leaks.
7. If compression fittings with threaded nuts are used, observe
any leaks after pump has run for approximately 15 minutes.
Further tighten compression nuts approximately 1/8 to 1/4
of a turn on all fittings in the system. Wait 15 minutes and
repeat the leak check. Note: Further adjustments should
not be necessary although it may take several days of
operation before all the air has been purged and the system is
stabilized.
8. Adjusting the Pressure Switch. Should the pressure switch
OFF setting vary with use and time to an unsuitable value,
it may be adjusted for optimum performance. Turn the
setscrew clockwise to increase the OFF pressure setting
and counter clockwise to decrease. The screw should not
be adjusted more than one half turn without consulting the
Factory. Excessive adjustment of the pressure switch could
cause low system pressure, rapid cycling ON/OFF operation,
and reduced pump and motor life. Damage may occur. The
Warranty does not cover improper adjustment of the pressure
switch.
Servicing:
Every Year: Check system against operating standards.
Every 2-3 Years: We recommend replacing the diaphragm and
checking against operating standards.
Troubleshooting Guide
Problem/Causes and Remedies
Pump will not Start
Check:
•
Correct voltage (±10%) and electrical connections
• Fuse or breaker
• Pressure switch operation and correct voltage at switch
• Rectifier or motor for open or grounded circuit
• Locked drive assembly
Pump will not Prime (No discharge with motor running)
Check:
•
Debris in strainer
• Restriction (kinks) in inlet/outlet tubes
• Debris or swelling in inlet/outlet valves
Pump will not Shut Off (Output line closed and no leaks)
Check:
•
Air trapped in outlet line or pump head
• Correct voltage to pump
• Debris in pump inlet/outlet valves
• Loose drive assembly or pump head screws
• Pressure switch operations/adjustments
Leaks from Pump Head or Switch
Check:
•
Loose screws at switch or pump head
• Switch diaphragm ruptured or pinched
• Punctured diaphragm if fluid is present