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HAMWORTHY HEATING LTD

FLEET V series

500001213/G

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’

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.

8.3.10 - 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

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

QAA73...

Function

Level

QAA73...

700

1st past value of lockout code counter

Engineer *

701

1st past value of lockout phase

Engineer *

702

1st past value of internal diagnostic code