Technical data

Procon
. LMU C, F I (’)
If the optional QAA Room Unit, RVA Cascade Controller, or
RVA Zone Controller has been connected to the boiler, and a fault
occurs, the  or ER will appear on the display of the respective Unit
as well as the boiler.
The Error message can be reviewed at the QAA Room Unit, RVA
Cascade Controller, or RVA Zone Controller, by opening the hinged
 ap and pressing the ‘DOWN’ Program button twice. ID Line  will be
displayed on the ‘Left-Hand’ side, with the error message on the ‘Right-
Hand’ side of the display.
To clear the error message the ‘RESET’ button on the boiler must be pressed, the error message CAN NOT be
cleared at the Room Unit, or RVA controller.
. R LMU O I
To aid the End User and/or the Installation/Commissioning Engineer, the operating information of the boilers’
LMU controller can be access and reviewed as follows;
Press the INFO button, then Press & Hold the
▲ & ▼ buttons until b appears (approximately  seconds).
Use the + & - buttons to review the b references, use the
▲ or ▼ buttons to change from b, to c & d references.
Press the MODE button at any time to return to the normal display.
The table below details the references and their meanings;
Ref Description Ref Description Ref Description
b Current Fault Code c No Function d No Function
b Actual Return Temp (°C) c
Actual Recti cation Current
(µAmps)
d
Theoretical Value for Flow Temp
(°C)
b Actual HWS Temp (°C) c
Actual Fan Speed
{XX ×  = Actual Revs/Min}
d
Actual Target Value for Flow Temp
(°C)
b Actual Flue Gas Temp (°C) c Actual PWM Drive Signal to Fan () d Room Temp Target Value (°C)
b
Actual Outside Air Temp
(°C)
c
Actual Boiler Output  Relative to
Maximum rate
d
HWS Temp Target Value
(°C)
b Averaged Outside Air Temp (°C) c
Actual PWM Output to Modulation
Boiler Pump (Not Used)
d
Maximum Modulation Depth of
Boiler ()
b
Attenuated Outside Air Temp
(°C)
c No Function d
Maximum Fan Speed / Power
Output of Boiler
b
Actual Flow Temp of Mixed Circuit,
when AGU. Clip Used (°C)
c No Function d No Function
b No Function c No Function d No Function
b No Function c No Function d No Function
. R LMU O E C
As an extension of the Standard ERROR Codes, the LMU also records Operating ERROR Codes, which can
be accessed by at Service / Commissioning Engineer.
To access the Operating ERROR Codes, ‘Press & Hold’ the ▲ & ▼ Buttons, for approximately  seconds. H  will
appear, then use the ▲ or ▼ Buttons to reference the Parameter Line ID Number detailed below.
Line ID
Number
Description Comments
H st Historical Fault – Number of Occurrences
The number of times that this Operating Error Code as shown in
Parameter H has occurred
H st Historical Fault – Operating Phase
The position during the operating sequence that the Operation
Error occurred
H st Historical Fault – Operating Error Code Actual Operating Code. Refer to Section .
H nd Historical Fault – Number of Occurrences
The number of times that this Operating Error Code as shown in
Parameter H has occurred
H nd Historical Fault – Operating Phase
The position during the operating sequence that the Operation
Error occurred.
Sequence
Number
Description
 Fan operating at pre-purge rate
 Ignition spark generation
 Gas valve activation

Flame stabilization and
recti cation
 Burner released to modulate
