Hamworthy F40H Installation, Commissioning And Operating Instructions page 73

APPENDIX F - CASCADE CONTROL & ADDITIONAL MIXING CIRCUIT
To Convert the boiler hydraulic diagram for cascade control & additional mixing circuit :
Before programming changes are made, ensure the boiler is set to standby mode.
Press and hold both up and down arrow keys for at least five seconds to enter advanced parameter list H90
displayed top right of HMI screen.
Use either up or down arrow key to scroll through the parameter list and stop at H552
Default value is 2
Figure. F1
Two options are available.
Option 1 - for use with the Merley sequence controller
To enable cascade control change the setting by using the + or – key and set value to 80.
Press mode button to store change and return to home screen.
Figure. F2
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HAMWORTHY HEATING LTD FLEET H series 500001212/F