User Manual

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Building Technologies Division CC1N7491en
18.07.2018
Functions
∂ Modulating control in both central heating (CH) and domestic hot water (DHW)
mode
∂ PID control of the heating water temperature
∂ PID control of the DHW temperature (DHW outlet temperature)
∂ NTC temperature sensor on central heating flow pipe
∂ NTC temperature sensor on instantaneous DHW line or storage tank
∂ Connection facility for a CH programmer / timer
∂ Connection facility for a non-safety-related flow switch (CH) or water pressure
switch
∂ Frost protection CH system (boiler only)
∂ Frost protection DHW (boiler only) (depending on the type of LMU34)
∂ Flame supervision by ionization
∂ Nonvolatile lockout in the event of loss of flame
∂ Nonvolatile lockout in case of high limit thermostat (TB) response
∂ Flue gas NTC temperature sensor input or flue gas thermostat input with non-
safety-related function
∂ Programmable fault response on flue gas failure: Volatile burner stop or nonvolatile
lockout
∂ Multitry ignition sequence
∂ Outside sensor input
∂ Integrated weather compensation of CH
∂ Pumps kick function and valves kick function
∂ 3 LEDs for status signals
∂ 2 x 7 segment red displays of temperature, faults and diagnostic data
∂ CH potentiometer and DHW potentiometer with additional service functions
∂ Control of fan speed (non-safety-related)
∂ Control of the heating circuit pump speed (non-safety-related)
∂ Connection to PC tool interface OCI490 / OCI425 with corresponding software
ACS… (laboratory use)
∂ OpenTherm (parameter settings for LMU34 via QAA73)
∂ Control condensate pump via DHW relay (depending on the type of LMU34)
∂ Potential-free relay connection for heating circuit zone pump / alarm
Function modes:
The general function modes are:
∂ Standby
∂ Frost protection
∂ Combi comfort
∂ Central heating
∂ DHW (combi or storage tank) (depending on the type of LMU34)
∂ Chimney sweep function
∂ Controller stop function
∂ Anomaly
Operating modes (OFF, summer, winter, remote and reset):
The following operating modes can be selected by means of the external rotary switch
(see connection diagram):
∂ Summer
∂ OFF
∂ Winter
∂ Reset (monostable position)
General functions