Mitsubishi Electric QAHV-N560YA-HPB, Service Handbook

Page: 99 / 176

[
VII
Control ]
- 92 -
HWE1517A GB
(3)Water flow rate adjustment operation (when the secondary side control is enabled)
Checking the flow rate after the flow rate adjustment operation
The flow rate adjustment operation adjusts the pump output and water flow rate valve opening to determine how
to match the flow rate characteristic to the local circuit.
Use the method below (*3
1
to
4
) to check the
operation result (characteristic).
If air bleeding was not done fully and the map not created properly, a water shutoff error, high pressure
error or other problems will occur when operating the system. Check the points below in this case. If the
values are abnormal, redo the air bleeding and flow rate adjustment operations.
(*3)
1
Set the PCB’s DIP switches as shown below.
2
Press SWP3 repeatedly to change the code shown in the PCB’s display. The code changes with each press
(*4).
Continue pressing SWP3 until ‘dxx’ is displayed in the PCB’s digital display.
(‘dxx’ is a code that stores the flow rate for a given pump output opening and valve opening. See Table 1.)
*4 If the flow rate adjustment operation has never been performed, ‘ng’ appears after the system startup
operation. Perform the flow rate adjustment operation in this case.
3
Press SWP1 or SWP2 to display the operation result (flow rate characteristic) corresponding each flow rate
code ‘dxx’ in Table 1 and write them down.
Step Contents Operation and check points Supplemental explanation
a Water level check
Check the water level is neither at the full or
empty level. Water is supplied even when the target
water level has been reached.
b Power operation Turn the power ON.
If the startup operation has not finished,
SW2-9 and SW2-3 need to be set as a
stopgap measure (see Note 1).
If this flow rate adjustment operation has
never been performed ‘--ng’ is displayed.
c Operation procedure 1
Check that the secondary side control is
enabled.
For details, refer to page 28 (II-[6]-(3)-3).
d Operation procedure 2
Change the setting of PCB slide SWS1 from
REMOTE to LOCAL.
-
e Operation procedure 3
Change the setting of SW1-6 from OFF to
ON.
The pump operation and flow rate
adjustment valve opening are automatically
adjusted, and the flow rate is measured in
30 second intervals.
* You can check whether this flow rate
adjustment operation has ended or is
underway using the setting given in Note 2.
f Stop operation 1
Change the setting of SW1-6 from ON to
OFF.
-
g Stop operation 2
Change the setting of PCB slide SWS1 from
LOCAL to REMOTE.
-
3 W S 2 W S
-10 -5 -6 -7 -8 -9 -10
OFF OFF OFF OFF OFF ON ON
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