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MHG Heating Ltd, Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey, KT20 5LR
P:0845 6448802 F:0845 6448803 E:
W: www.mhgheating.co.uk
010617
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14.2 Module LMU64 Setting.
(Images of QAA73 Room Unit/Service Tool in Section 16.3)
The Single and Cascade Master units are pre-set 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 required. 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 MHG Heating Ltd Technical Department for further
assistance.
QAA73
#
Description
Range
150 &
225
Single
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
H506
Minimum flow setpoint temperature
(20 °C<=TvSmin<=TvSmax)
20 ... 90 °C
25
25
25
H507
Maximum flow setpoint temperature
(TvSmin<=TvSmax<=90 °C)
20 ... 90 °C
90
90
90
H516
Summer / winter changeover temperature
(30 °C: S / W changeover deactivated)
8 ... 30 °C
18
18
18
H532
Heating curve slope heating circuit 1
1 ... 40
32
32
32
H533
Heating curve slope heating circuit 2
1 ... 40
32
32
32
H536
Maximum speed at maximum output in heating
mode
(maximum speed limitation)
0 ... 9950 rpm
7000
7000
7000
