Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Operating modes 03.10.2011
The following table shows the various possibilities and combinations for 2-speed
fans:
Plant operating
mode
Fan control description
Normal operation
(
Comfort)
Permanent for speed 2 as soon as setting parameter
"clock priority speed 2"
1)
is set to "Yes"; else at least
speed 1 is on permanently
Changeover criteria: Speed 1, speed 2
 Room supply air temperature cascade according to
heating/refrigeration demand
 IAQ control in dependence of "Setpoint fan speed 2"
Normal operation
(
Precomfort)
Permanent for speed 1
Sustained mode
(
Precomfort)
Speed 1 or speed 2 (depending on the setting
parameters) as soon as a Precomfort switch-on criterion
is met
1)
Changeover criteria: Speed 1, speed 2
 Room supply air temperature cascade according to
heating/refrigeration demand
 IAQ control in dependence of "Setpoint fan speed 2"
Recirculated air
mode
(
Precomfort)
Permanent for speed 1
2)
Changeover criteria: Speed 1, speed 2
 Room supply air temperature cascade according to
heating/refrigeration demand
 IAQ control in dependence of "Setpoint fan speed 2"
Sustained mode
(
Economy)
Speed 1 or speed 2 (depending on setting parameter) as
soon as a Economy switch-on criterion is met
1)
Changeover criteria: Speed 1, speed 2
 Room supply air temperature cascade according to
heating/refrigeration demand
 IAQ control in dependence of "Setpoint fan speed 2"
Night cooling
Speed 1 or speed 2 is switched on as soon as the
switch-on criterion for night cooling is met, depending on
the setting for operating line "Speed"
3)
Plant OFF
Permanent on Off
1)
see Chapter 10.1.5 "Time switch priority speed 2"
2)
You can indicate for the extract air fan if it is to be switched on in sustained or recirculated air mode
(see section 10.1.13 "Sustained/recirculated air mode (basic t
ype A)")
3)
For more detailed information, refer to section 21.1
The fire alarm off / smoke extraction function as well as frost protection is ensured
for all plant operating modes.
Note