HAMWORTHY HEATING LTD
36
PUREWELL
Vari
Heat c
500001169/T
8.3.8 - Start-up / initialisation
On startup after power-On, or after a lockout reset, the setpoints will be initialized.
These setpoints apply until a first adjustment is made (e.g. via the display or PC parameterization):
After a readjustment, these values will be overwritten with the new value and permanently stored in the LMU.
When a new startup is made, or after power-On, the previous settings will be stored in the LMU.
Also, the software version number of the operator module and that of the connected type of LMU... will be deliv-
ered to the display.
8.3.9 - BMS 0~10v DC control of LMU
Before programming changes are made, ensure the boiler is set to standby mode.
The following parameters need to be changed on the boiler LMU when a BMS 0-10 V signal is being used to
control the boiler modules directly. All parameters can be changed using the keypad on the boiler display panel or
via the computer link using the Siemens software.
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 H618 - Default value is 0
Two options for control are available :
Option 1 (
preferred option for multiple boilers on a modulating 0-10V signal controlling the load
)
To enable 0-10v control over the boiler power range, change the setting by using the + or – key and set value to
5. Press mode button to store change and return to home screen.
Option 2 (
if the 0-10V signal is only being used to enable the boilers and is not modulating
)
To enable 0-10v control over the boiler temperature set point, change the setting by using the + or – key and set
value to 4. Press mode button to store change and return to home screen
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 H622 - Default value is 80
Change this value to match the required flow temperature set point at maximum (10v) e.g. 80 = 80°C max set
point. Press mode button to store change and return to home screen
0-10v signal wiring can now be connected to connections 15 and 16 of the terminal rail to control the boiler.
Boiler PC Req’
d
setting
Function
618 526 4 0–10 V - temperature
618 526 5
0–10 V - load (preferred option for modulating load)
622 528 As req’d (80°C) Max temp = 10 V
623 529 As req’d (20%) Min % load = 20 %
It may be necessary, depending on the operating temperature required, to raise the maximum operating
temperature possible from the individual boiler modules. As standard the boiler modules leave the factory with a
maximum operating temperature of 85°C. Where a higher operating temperature is required the following
parameter change must be made.
505 181 As req’d (90°C) Max operating temp.
8.4 - Access to LMU Fault Log
The LMU control retains historical fault information of the last 6 faults, as read only via the Engineer level access.
The current fault relates to the actual lockout at the time of the visit. Once reset, the current fault becomes the 1st
fault and the remaining history is shifted back to the 5th fault, losing the previous 5th fault history.
The Albatros code is the ‘E’ display code supported by the internal code. See figure 8.2.9
Note :
When connecting to a QAA73 unit refer to Hamworthy OEM manual 500001140
When connecting to a Merley control unit refer to Hamworthy OEM manual 500001210
Summary of Contents for Purewell VariHeat 70c
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Page 43: ...HAMWORTHY HEATING LTD 37 PUREWELL VariHeat c 500001169 T Figure 8 3 11 Operating phases ...
Page 44: ...HAMWORTHY HEATING LTD 38 PUREWELL VariHeat c 500001169 T Figure 9 0 Boiler Wiring Schematic ...
Page 65: ...HAMWORTHY HEATING LTD 59 PUREWELL VariHeat c 500001169 T Figure E1 2 Typical Piping Layouts ...
Page 70: ...HAMWORTHY HEATING LTD 64 PUREWELL VariHeat c 500001169 T NOTES ...
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