experience tells you what to do

confidence allows you to do it

Checking the Charger Output Voltage with a Multimeter

(Refer to Wiring Diagrams, if necessary)

• Diagnosis by Multi-Meter (Available at Radio shack or Hardware/Electronic Stores)
  
  
  
  1. Measure D.C. (Direct Current) voltage: To measure battery or charger’s output DC voltage.
     Turn meter knob to DC V20 (to measure 20 volts and below). Plug red lead into meter ”VΩ” and black lead into meter "COM:
     
     
     
     1. Battery measurement: Connect meter's red lead to battery (+) red A terminal and meter's black lead to battery (-) black B terminal. The meter reading is the battery no-load voltage. It is different from battery voltage under-load, when the battery is supplying power to drive motor. If there is a (-) negative sign in front of the reading that means the lead polarity is reversed.
        
        - 6 volt battery no-load voltage should be greater than 6.0 and under-load voltage should be greater than 5.5
        
        
        - 12 volt battery no-load voltage should be greater than 12.0 and under-load voltage should be greater than 11.0
        
        
     2. AC charger output DC voltage measurement: Connect meter's red lead to charger output R(+) terminal and meter's black lead to charger output S(-) terminal. The meter's reading is charger output no-load voltage (Minimum 7 volt for 6 volt battery charger and 14 volt for 12 volt battery charger). If the meter has no reading, it could be either the AC wall plug has no power or the charger has broken wire or is damaged.
        It is very important to use only Flow Pro AC charger adaptor to prevent the battery from being damaged.
        The Flow Pro AC charger is designed to slow-charge the battery to lengthen its life. It normally requires 12 hours to fully charge an empty battery. When the battery is full, the AC charger regulates it's charging current down to about 0.03 amp. This 0.03 amp charging current will not damage the battery if you forget to stop the charging process for many days.
        Flow Pro maintenance free lead acid rechargeable battery has no memory problems like nickel-cadmium batteries. Therefore Flow Pro highly recommends you to recharge your battery at the end of each day's spraying job. It is recommended that you recharge the battery once every 3~6 months when the sprayer is not in use.
        
     
     
  2. Measuring wire continuity or switch function (ON or OFF): Turn meter knob to Ω ))). Plug red lead into meter "VΩ” and black lead into meter "COM"
     
     
     
     1. To diagnose Model 417 wire L to N continuity: connect meter's red lead to L and black lead to N. If the meter shows 0 or sounds "B", this means the wire between L to N is continuous. If meter shows "1" or is silent, this means the wire between L to N is broken.
        
     2. To diagnose Model 421, 430, 450, 456 main switch's function ON or OFF: Unplug one of the main switch's wire terminal I. Connect meter’s red lead to I and black lead to J. If the switch is in ON position, the meter should shows 0 or sound "B". If the switch is in OFF position, the meter should shows "1" or is silent. The same diagnosis procedures are used for spray gun microswitch.
        
     
     
  3. Measuring charging current or sprayer current consumption:
     Turn meter knob to A~10A or 20A. Plug red lead into meter "10A or 20A" and black lead into meter "COM"
     Warning: Only measure the current in "series". Directly connecting meter’s red lead to battery (+) red terminal and black lead to battery (-) black terminal will damage to the battery, meter and leads.
     
     
     
     1. Measuring Model 417 charging current: plug the AC charger P, Q terminals into your AC wall plug. Connect the AC charger output plug R, S, to battery charging plug E, F, G, Disconnect battery A (+) terminal wire. Connect meter's red lead with the disconnected terminal wire and connect meter's black lead to the battery (+) red terminal. The meter reading is the charging current. The charging current will decrease from about 0.5 amp to 0.03 amp in 12 hours of charging time. If there is a (-) sign in front of the meter reading, it means the polarity of the positive and negative leads are reversed.
        
     2. Measuring Model 456 current consumption during spraying application: Turn sprayer main switch ON and open spray gun valve. Disconnect fuse terminal C wire. Connect meter's red lead to disconnected wire and meter's black lead to fuse terminal C. The meter’s reading ranging from 1.0 amp to 2.10 amp is the current consumption of the pump during spraying application. If there is a (-) negative sign in front of the meter reading, it means the polarity of the positive and negative leads are reversed.
     
     
  
  
• Speedy Diagnosis without the multi-Meter
  
  
  
  1. A through 1.C are detailed diagnosis of Flow Pro Rechargeable Sprayers by use of a
     multimeter. There is a fast way to check whether you have a broken battery, motor, or
     wiring/switch.
     
     
     
     1. Use a good spare battery and replace the existing battery. Turn ON sprayer switches. If the motor runs, it proves the existing battery is broken or not charged.
        
     2. Use a good spare battery and one good red wire and one good black wire, bypass the sprayer wiring and switch: directly connect spare battery A, B terminals to motor M, N terminals. If the motor runs, it proves that the wire or switch failed. If the motor does not run, it proves the motor failed