Technical data

© MHS Boilers Ltd
221106 Draft Copy E&OE
30
Control Parameter Default Settings.
Module LMU64 Setting.
The Standalone and Cascade Master units are preset for correct operation.
However the slave units may require modest parameter updating. (Usually limited to H605)
The following Pages detail the parameters of the modules and the Standard Factory settings,
please note, the installer/commissioning engineer may have changed some of these settings to suit
the system installed.
To access the parameters detailed below a QAA73 Room Unit is require. The unit must be
connected to the respective Module Controller Via the dedicated Plug, Behind cover plate (4) or
directly to the respective LMU64 module controller. Via the X10:01 Terminal.
There are two levels of access available, as follows. If you cannot access a particular parameter
line, please consult with MHS Boilers Technical Department for further assistance.
Level One
(Installer)
-
Press & Hold the Program Buttons simultaneously for at
least 3 seconds until INITIALIZATION BMU PARAMETER is
displayed on the appears on the screen. Use the
Program
Buttons to access the desired parameter line. Use the
Button to alter the displayed parameter to the required setting.
Level Two
(OEM)
-
Whilst in Level One Press & Hold the
Program Buttons
simultaneously for at least 3 seconds until INITIALIZATION BMU
SERVICE is displayed on the screen. Use the
Program
Buttons to access the desired parameter line. Use the
Button to alter the displayed parameter to the required setting.
An altered parameter will be saved to the controllers memory by leaving the displayed parameter
when either of the
Program Buttons are pressed.
To exit the parameter review and amendment levels the INFO Button of the QAA73 must be
pressed. Any unsaved parameter alterations will be lost if the QAA73 is version 1.3 or lower.
QAA73 #
Description Range
150 & 225
Standalone
Defaults
150 & 225
Cascade
Master
Defaults
150 & 225
Cascade Slave
Defaults
H90
Reduced Temperature for DHW 8….60 10 10 10
H91
DHW Production Control
(0=Time control 1=Constant)
0…1 0 0 0
H93
DHW Production Control 0=Non Eco 1=Eco 0…1 0 0 0
H94
DHW Secondary Pump Control
(0= As H91. 1= As HWS Time Switch)
(K2, X2:03, H615:6)
0…1 0 0 0
H503
Minimum boiler setpoint temperature
(20 °C<=TkSmin<=TkSmax)
20 ... 90 °C 20 20 20
H504
Maximum boiler setpoint temperature
(TkSmin<=TkSmax<=90 °C)
20 ... 90 °C 90 90 90
H505
Boiler setpoint at design outside temperature 20 ... 90 °C 85 85 85