Siemens Building Technologies / HVAC Products
H74 319 0037 0 b
CM1P1571X1 03.05.2013
3/8
Function
The integrated VOC sensor measures concentrations of odorous
substances and gases, such as tabacco smoke, human body
odours, kitchen odours, carbon monoxide, methane, ethanol,
acetone, methanol, etc., in the room air.
The concentrations measured by the sensor are compared with the
setpoint. If the setpoint is exceeded, the fan or the air damper
actuator will be switched on via control output Y1. When the air
quality improves as a result of the ventilation or other influencing
factors, the device connected to control output Y1 will be deactivated
again.
The QPA84 is supplied with a factory-set setpoint. As soon as the
controller is connected to power, the self-adaptation algorithm
ensures that the indoor air quality setpoint will be matched to the
local supply air quality.
The switching on / off behaviour of control output Y1 can be changed
by means of a shorting plug:
Position of
shorting plug
Action
−
0
+
15
71
Z01
Very good air quality level, increased
energy consumption
1)
−
0
+
15
7
1Z0
2
Good air quality level, optimum energy
consumption
1)
(factory setting)
−
0
+
15
7
1Z0
3
Acceptable air quality level, minimum
energy consumption
1)
1) Energy consumption resulting from heating or cooling and fan operation.
Note!
To change the position of the shorting plug, the housing cover must
be removed. This work must be carried out by an authorized
electrician since there is a risk of touching mains–carrying wires or
parts.
Equipment combinations
For indoor air quality control with extract air dampers:
OpenAir
TM
two-position air damper actuators
GCA32...
Mechanical design
The controller consists of three major parts: the mounting plate made
of plastic, the housing which accommodates the sensor and the
control electronics, and the housing cover which is also made of
plastic. Using suitable screws, the
mounting plate is secured to a
commercially available recessed conduit box. The housing engages
in the mounting plate and is then secured by means of two catches.
After wiring, the housing cover is also secured with two catches.
Sensor, connection and setting elements
1 Connection
terminals
2
Shorting plug for changing the
switching on / off behaviour of
control output Y1.
Plug positions:
0
= good air quality (factory
setting)
−
= acceptable air quality
+
= very good air quality
3
VOC sensing element
Engineering notes
Power supply to the QPA84 should not be interrupted during
operation (e.g. by a manual switch or time switch program). If
interrupted, the controller will lose the adapted indoor air quality
setpoint (the optimum setpoint for the room).
Caution!
The QPA84 may not be used for safety-related gas measure-
ments!
The screw terminals are only suited for installation wires.
Stranded wires are not permitted!
A 10 A prefuse must be used in the power supply line (L) to the
controller.
The two terminals for the protective earth (interconnected inside
the unit) are merely used for earthing a regulating unit of safety
class I connected to output Y1
The maximum permissible switching current (I) at output Y1 must be
observed. It is dependent on the ambient temperature (T) of the
QPA84:
9
8
7
6
5
4
3
2
1
0
−
5
0
5
10
15
20
25
30
35
40
45
50
I
[A]
T
15
71
D
01
[°C]
Mounting notes
Mounting location:
in the room.
The location where the controller is mounted should be
representative of the indoor air quality level, e.g. on an open wall, 1.5
to 3 m above the floor. The controller should not be mounted in
niches or bookshelves, not behind curtains, etc., or in locations
where people are continuously present (within one to two meters),
such as speaker’s desks, working places, etc. The controller is to be
mounted on a commercially available recessed conduit box using
metal screws St3.5 to DIN 7981 or wood screws d3.5 to DIN 96. The
permissible environmental conditions must be observed.
The controller is supplied complete with detailed mounting
instructions.
Note!
The controller must be installed by an authorized
electrician.
Commissioning notes
The sensing element requires about one minute to attain the right
operating temperature. Control output Y1 can be activated by the
electronics, depending on the mixed-gas concentration in the room.
The proper functioning of the QPA84 can then be checked as
follows:
– Hold a cloth or cotton-wool pad saturated with alcohol in front of
the unit’s ventilation slots, or
– Let gas from a cigarette lighter enter the ventilation slots
Then, control output Y1 will be activated after a short period of time.
Operating notes
After about two days, the QPA84 will assume the setpoint that
ensures optimum indoor air quality. This is accomplished by the
setpoint adaptation algorithm. The algorithm adjusts the setpoint
periodically. For this reason, the power supply to the controller
should not be interrupted. The unit is maintenance-free.
Technical data
Operating voltage
AC 230 V
+
10 %
−
15 %
Mains frequency
50 / 60 Hz
±
4 %
Power consumption
0.5 VA
Fuse (external)
10 A
Control output Y1
Breaking voltage
non-potential-free switching
contact AC 230 V
Switching current
1)
max. 8 A (res.)
max. 6.8 A (ind.), cos
ϕ
= 0.6
Connection terminals for
1x 2,5 or 2x 1,5 mm
2
Cable lengths L, N, Y1
depending on the load and in
compliance with local regulations
Degree of housing protection
IP 30 to EN 60 529
Safety class
II to EN 60 730
Environmental conditions
Operation
to IEC 721-3-3
Climatic conditions
class 3K5
Temperature
−
5 …
+
50 °C (non-condensing)
Humidity
< 85 % r.h.
Mechanical conditions
class 3M2
Transport
to EC 721-3-2
Climatic conditions
class 2K3
Temperature
−
25 …
+
65 °C
Humidity
< 95 % r.h.
Mechanical conditions
class 2M2
Product standard
Automatic electrical controls
for household and similar use
EN 60 730-1 and EN 60 730-2-11
Electromagnetic compatibilty
Immunity
EN 50 082-2
Emissions
EN 50 081-1
conformity to
EMC directive
89 / 336 / EEC
Low voltage directive
73 / 23 / EEC
Weight, incl. packing
0.28 kg
1) The maximum permissible switching current is dependent on the ambient
temperature of the QPA84 (refer to "Engineering notes")
LN
Y
1
N
1
2
3
15
71
Z
04
AIRQUALITY
−
0
+
