Bosch Worcester Greenstar HIU, Инструкция по установке и обслуживанию

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Fault finding and diagnostics
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9.4 Control valve fault indication
The modulating control valves for CH and DHW have three indicators on
the head of the actuator to denote operational states, see figure 7,
Designation of components, items [4] and [5] to locate the valves.
The case, insulation and control box will need to be removed to gain
access to the control valve indicators.
There are three symbols on the head of the valve actuator, behind these
symbols are coloured indicators that are used to indicate the error
situation. The table below gives details of the coloured indicators and
their meaning:
Fig. 78 Control Valve indicators
[1] Circle - Green
[2] Square - Blue
[3] Triangle - Orange
9.4.1 Action of control valve during an error
When an error occurs, there will be a recovery attempt made by the
control unit. The valve will back off from its stuck position and then try to
push through the blockage in order to reach its set point position. This
recovery attempt will last approximately 0.5 seconds.
If this is successful, the error will reset.
If it is not successful, then an error signal is sent from the control valve to
the control unit and the control valve will try to move to its closed
position. If the control valve reaches its closed position but is still in
error, an error signal is still sent to the control unit. The error will be
indicated on the HIU control unit,

9.3.
9.4.2 Control valve calibration
The control valve can be calibrated by:
▶ Manually set the rotary switch for the control valve on the control unit
to the calibration position, ( ).
The control valve will enter its calibration process below:
• Valve moves to fully closed position.
• Valve moves to fully open position
• Valve moves back to normal operation.
If the control valve has finished its calibration process but is still in
calibration mode, the valve will move to fully open position and remains
there for 10 minutes, or until calibration mode is exited:
▶ Manually setting the rotary switch for the control valve on the control
unit to the required set point.
9.5 Circulating pump fault indication
If the circulating pump has detected one or more errors, the bi-coloured
LED 1 switches from green to red. When an error is active, the LEDs
indicate the error type as shown in table. If multiple errors are active at
the same time, the LEDs only show the error with the highest priority.
The priority is defined by the sequence of the table.
When there is no active error anymore, the user interface switches back
to operation mode.
Fig. 79 Circulating pump fault indication
[1] LED indicators
Indicators ON Reason/Problem
Green flashing Valve is stuck completely open
Green and blue
flashing Valve is stuck between 60 and 99.9% open
Blue flashing Valve is stuck between 40 and 60% open
Blue and Orange
flashing Valve is stuck between 0.1 and 40% open
Orange flashing Valve is stuck completely closed
Green and
Orange The input signal is fault and the valve is completely
closed
Green, Blue and
Orange flashing Faulty valve
Table 35 Control valve fault indication
6720808928-30.1W
o
3
2
1
Display Indication Pump operation Counter action
One red LED +
one yellow LED
(LED 5) Rotor is
blocked. Trying to start
again every 1.33
seconds. Wait or unblock the
shaft.
One red LED +
one yellow LED
(LED 4) Supply
voltage too
low. Only warning,
pump runs. Control the supply
voltage.
One red LED +
one yellow LED
(LED 3) Electrical
error. Pump is stopped
because of low
supply voltage or
serious failure. Control the supply
voltage/replace the
pump
Table 36 Circulating pump fault indication
1
2
3
4
5
6720808917-23.1W
o
1