172-65605M-14 (SQ2/SQ4/SQ6) 10 Dec 2019
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(2) Temperature sensor (No. 8)
a) Check for build-up on the temperature sensor
protection tube and remove if necessary. Remove
the temperature sensor and check the surface of
the protection tube at the tip of the sensor.
b) Calibration of the temperature sensor
If there is any doubt about the temperature indication value, request a
calibration inspection by TLV or the sensor manufacturer.
(3) Flow sensor (No. 7)
a) Checking the water sensing accuracy
The stability level indicator at the bottom left
of the display shows the sensing accuracy of
the sensor.
Three or four bars lit means a higher sensing
accuracy. When only one or two bars are
flashing, it means accurate sensing cannot
be performed. This problem may be solved by cleaning the piping. If
an appropriate accuracy cannot be obtained even after the piping is
cleaned, contact TLV.
b) Operational check
• Quick check
If it is possible to reduce or stop the water supply, the operational
status can be verified by checking whether water is being supplied
and "flow sensor present value" is displayed.
• Calibration check
Request a calibration inspection by TLV or the flow sensor
manufacturer.
(4) Circulating pump (No. 22)/solenoid valve (No. 23)
The circulating pump operates when supply water is stopped
(still in operation) or while stopping operation.
The circulating pump and solenoid valve can be confirmed to
be operating correctly if vibration due to water flow can be
felt when touching the pump or valve piping.
When touching the inner piping of the pump, take care to
avoid burns, as the piping may be hot.
Even if the water supply valve on the water system side (not
included with the unit) is closed, an operational check can be performed, as
the circulating pump still operates on the heat exchanger (No. 6).
3. Consumable parts and their estimated replacement timing.
Refer to the table below for the estimated replacement timing for consumable
parts.
Part
Estimated Timing for replacement
Pressure Gauge
Periodically, when the indicated value is incorrect, or "0" is not
indicated in the atmospheric pressure
Valve Seat
(Solenoid Valve)
When liquid leaks, or every 100,000 opening/closing operations
Gaskets
When liquid leaks, or when the unit is disassembled
NOTE: For details regarding maintenance and inspection of each part, refer to
respective instruction manuals.
