Siemens QAA55.110 User Manual

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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
1
st
changeover 2
nd
changeover 3
rd
changeover 4
th
changeover
K 1
K 2
K 3
K 4
K 2
K 3
K 4
K 1
K 3
K 4
K 1
K 2
K 4
K 1
K 2
K 3
t [h]
100
300
400200
P [kW]
2379Z07
Lag heat source
Lead heat source
t = total number of operating hours of all lead heat sources = total output of cascade
[kW]
Setting of the source sequence exclusion is only used in connection with the activated
source sequence (3540).
With source sequence exclusion, the first and / or the last heat source can be
exempted from automatic changeover.
None
The order of switching on the heat sources changes when the number of hours set is
reached (3540).
First
The first heat source in the addressing scheme always remains the lead heat source.
With the other heat sources, the order of switching on changes when the set number of
hours is reached (3540).
Last
The last heat source in the addressing scheme always remains the last. The other heat
sources change when the set number of hours is reached (3540).
First and last
The first heat source in the addressing scheme always remains the lead heat source.
The last heat source in the addressing scheme always remains the last. The heat
sources in between change when the set number of hours is reached (3540).
The leading source is only selected in connection with the fixed order of the heat
source sequence (3540).
The heat source defined as the lead heat source is always the first to be switched on
and the last to be switched off. The other heat sources are switched on and off in the
order of their device addresses.
Electric immersion heaters in the cascade
Many heat pumps are equipped with an electric immersion heater (K25) in the flow
(directly after the condenser). The electric immersion heaters can be of the 2- or 3-
stage type (K25 and K26).
If all compressor stages of the cascade are released, the electric immersion heater of
the heat pump with first priority is released. Electric immersion heaters are released
according to the same criteria as heat pumps (release and reset integral). The heat
pump reports to the source master when all stages of the electric immersion heater are
released, or when no electric immersion heater is available.
A
uto source seq exclusion
Leading source

Siemens QAA55.110 Specifications

General

Brand	Siemens
Model	QAA55.110
Category	Controller
Language	English