AB-7350-U
26
Inspection and Troubleshooting
WARNING
Some of the product models weigh more than 40 lb (18.1 kg). Carefully move the product with a vehicle or enough
manpower in an appropriate manner. Careless lift or accidental drop of the product might cause injury or product
damage.
Detach the cover only when wiring, setting the product or maintenance and reattach the cover after wiring, setting the
product or maintenance. Failure to do so might cause electric shock.
Before wiring or maintenance, be sure to turn off the power to the product. Failure to do so might cause electric shock
or device failure.
CAUTION
Do not touch the moving parts of the product. Doing so might cause injury.
Do not carelessly touch this product when being used to control hot water. The product temperature is hot, and
you might get burned.
Do not disassemble the product. Doing so might cause device failure.
Inspect the product according to Table 1.
Be sure to check the flow measuring accuracy according to
Flow measuring accuracy
in Table 1. Flow measuring
accuracy is very essential for this product used for energy management, energy-saving application, etc. (To inspect flow
measuring accuracy, optional Display Panel is required.)
Manually open/close the product at least once a month if it is left in inactive state for a long period.
Visually inspect the fluid leakage of the valve and the actuator operations every six months. If any of the problems described
in
AB-7363-U Instruction Manual of ACTIVAL Flow Measurement and Control Valve
Standalone Model
(Chapter 4.
Troubleshooting)
are found, take corresponding actions shown in that manual.
If your problem is not solved by the corresponding action, please contact our salesperson/serviceperson.
Table 1. Inspection items and details
Inspection item
Inspection interval
Inspection detail
Visual inspection
Semiannual
Fluid leakage from the gland and the flange face
Loosened
bolts
Valve and actuator damages
Operating status
Semiannual
Unstable open/close operation
Abnormal noise and vibration
Abnormal differential pressure across valve (Pvin-Pvout) in fully closed/open
position.
Routine inspection
Any time
Fluid leakage to the outside
Abnormal noise and vibration
Unstable open/close operation
Valve
hunting
Flow measuring
accuracy*
1
Any time (annual)
Measuring accuracy of differential pressure across valve:
Measure the valve inlet pressure and outlet pressure when they are equal and check
the values measured by the valve sensor. If difference of the values is ± 0.44 psig,
flow measuring accuracy satisfies the factory preset accuracy.
Situation of inlet pressure equal to outlet pressure
No flow across the valve in open position
e.g, when supply pump is OFF, or when hand valves on the inflow and/or outflow
sides of the valve are/is fully closed.
Valve position detecting accuracy:
Select the position control*
2
, and check the position of the actuator pointer when
50 % position signal is input. If the pointer points out of 0.39" (1 cm) range from the
50 % scale (the center of the lower setscrew of the terminal cover), product
replacement is required. See Fig. 34.
Notes:
1 Simplified inspection of flow measuring accuracy is illustrated above. For accurate inspection, a reference flow meter is required. Note that
you cannot field-calibrate or field-adjust flow measuring accuracy.
2 To select the position control, refer to
AB-7363-U Instruction Manual of ACTIVAL Flow Measurement and Control Valve
Standalone
Model
.
