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The secondary circuit pump is controlled by the QAHV output (TB6) +10V or +12V must be supplied to
terminal 10 of TB6. A control signal is sent from the QAHV to the pump via terminal 11 of TB6, see below
& the wiring section for details
The secondary circuit pump curve should be set up to control as below
*Most pumps have a 0-2V dead band, this will require changing as above. See table 2
The QAHV will send a 6% (1.12V) signal to the secondary circuit pump during flow rate adjustment
operation.
If the low sensor does not detect a change in flow rate a 2501 error will be displayed.
Analogue output setting with 12V input. Table 1
Dipswitch Setting
Lower analogue output limit
when there is secondary side
SW 2-10: OFF
SW 3-5,7.9.10:
OFF
Change analogue input power
SW3-8: ON
source when there is secondary
*1 code 1515 can be used to control start voltage of external water circulation pump
Secondary circuit pump
Setting item
control *1
side control
38
Item
Lower
Upper
Unit
code
limit
1515
V
0
1517
-
0
Initial
Increments
limit
value
0.1
4
0
1
1
0
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