Hamworthy Purewell VariHeat he Installation, Commisioning And Maintenance Instructions page 36

8.7.1.6 - Cascade Information Screen
This screen will appear as soon as the left button is pressed five times from the 'Boiler & Circulation Status
Screen' and the controller is configured as a Cascade Master.
The first line will give information about the power given to each activated Slave followed by the total power con-
trolled by the Cascade. This second value can reach more than 100%, when for instance 6 boilers are connected,
the total power of the cascade is set to 600%.
The second line will give information about connected Slaves. The first number is the address of the Slave (or
Master) which has the highest priority. When a "-" is shown, the corresponding number of that Slave which is not
connected, or is 'locked out', is not available to the Cascade. When the number is flashing, that relevant Slave or
Master, is participating in the heat demand.
Example: - a cascade configured with 6 boilers (addressed 0,1,2,4,5,7), the actual power is 65% and currently 3
boilers are turned on, boiler number 5 has the highest priority.
Status
Cascade ON at 65% of a
max of 600%
Figure 8.7.1.6 - Cascade Information Screen
8.7.2 Controlled Programming of Parameters from the Display
With the display, several parameter settings can be changed. There are three levels of access to the parameters:
•
'User' level. Parameters accessible by the User, are protected with a 4 digit code (default 0303), which is
programmable by the User. To enter the 'Access Code', the User should press and hold the Exit key for 3
seconds.
•
'Engineer' level. Parameters accessible by the Engineer, are protected with a 4 digit code (refer to Hamwor-
thy Heating Ltd). To enter the 'Access Code', the User should press and hold the Exit key for 3 seconds.
•
'Factory' level. Some parameters are only accessible by the manufacturer. To access these parameters, a
PC tool is required.
8.7.2.1 Code Input Menu
This screen allows access to the above security levels, such that parameters can be changed. After pressing the
Exit button for 3 seconds, the display shows a four digit sequence zeros. After entering the security number press
enter again.
The code can be entered by moving to each digit in the sequence using the 'left / right' keys. A flashing digit indi-
cates the position in the sequence to be entered. The 'up / down' keys can be used to increase or decrease the
digit value.
After selecting the correct code (User or Engineer), the Enter key must be pressed. If the correct code has been
entered, the display confirms for one second the security level entered, before going into the options menu in that
level. When an incorrect code is put in , the display will return to the normal status screen.
Status
Code Input Menu
Figure 8.7.2.1 - Access Status Screen
8.7.2.2 Main Menu (Within The Security Level Chosen)
The main menu is shown as a list which can be scrolled by pressing the 'Up or Down' keys. Within the list are
items which are accessible by entering the appropriate code.
The currently selected item on the list is identified by the '►' symbol. Pressing the 'Enter' key will select a sub-
menu relevant to the currently selected item. Only selected items relevant to the code entered are displayed. To
leave the main menu and return to the 'Boiler and Pump Status Screen', press the 'Exit' key.
After selection of a menu item, the display will show the description and an alternating menu number. By pressing
the 'Up / Down' key the specific number can be selected. The value of that item will be shown as that item number
is selected by pressing the 'On/Off' key. At this point the 'Up / Down keys will change the value of the selected
item. To save the new value, the Enter key must be pressed, and the value will be stored in the EEPROM, before
returning to the 'Boiler and Pump Status Screen'. Should additional parameters require adjustment, by pressing
the 'Exit' key after changing the value of the item, the screen will return to the 'Main Menu'. Once all values have
been changed, the Enter key can be pressed to return to Boiler and Pump Status Screen'.
Should a changed value not be stored in the EEPROM, the control will revert to the original setting at the end of
the current heat demand.
HAMWORTHY HEATING LTD
Description
3 out of 6 boilers are turned On. Highest priority is set to boiler '5'.
Boilers 6 & 3 are not connected or are in Lockout.
Description
Code Input Menu accessed by User
PUREWELL VariHeat he
31
LCD Display
CAS POW:065%600%
PRESENT:5-7 0 1 2-4
LCD Display
ENTER MENU CODE
0303
500001155/F