User Manual

Standard controllers
Communicating HVAC controllers
Application examples RMU..
5-32
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Siemens Switzerland Ltd
Building Technologies Division
5
Room-supply air temperature cascade and humidity controlRMU730B..
AEZH02 U3B HQ
V 7-day time switch with holiday / special day program
V Control of a 2-speed fan
V Room (extract air)-supply air temperature cascade control with minimum and
maximum limitation of the supply air temperature
V Control of the supply air temperature via the mixed air dampers‚ the reheater
valve and the cooling coil valve in sequence
V Control of the dewpoint temperature via the mixed air dampers and the pre-
heater valve in sequence
V Control of room humidification via the air humidifier (on command) and the
cooling coil valve in sequence
V Frost protection with frost protection monitor
V Supervision of the supply and extract air fans with differential pressure sen-
sors
V Supervision of the supply air filter with a differential pressure sensor
V Limitation of supply air humidity by switching off the air humidifier in
sequence
The indicated energy efficiency classification can be attained only if the fol-
lowing functions are implemented:
V Air flow control at the room level‚ demand control (Air quality sensor
required)
V Air flow control at the air handler level‚ automatic flow or pressure control
with or without pressure reset (Automatic fan step switching corresponds to
Efficiency Class B / Step 2 must be switched based on air quality)
V With heat exchanger overheating control
V Free mechanical cooling (Outside air temperature and room temperature sen-
sor required)
V Supply Temperature control‚ variable set point with load dependant compen-
sation
V With supply air humidity control
To fulfill the classification‚ the plant must be equipped with
all indicated functions.