Data Sheet for Product

5/6
Building Technologies QAA88.3 – Room unit with PPS2 interface CE2Q1626en
HVAC Products 18-11-2005
Technical data
Supply voltage Maximum voltage (SELV to HD 384) DC 24V
The room unit receives its power from the
connected controller, via the PPS2 interface
(SELV, security extra low voltage according
to HD384)
Power consumption (from controller) Max. 0.10 VA
Function data Temperature sensor
Measuring element NTC resistor
Measuring range 0 … 40 °C
Response time ≤ 10 min
Accuracy (5 … 30 °C) ±1 K
Accuracy (25 °C) ± 0.5 K
Set-point correction
Correction range (determined by controller) max. ± 10 K (default ± 3 K)
Display
Type LCD
Functions displayed – Room temperature
– Setpoint adjustment
– Operating mode
– Manually selected fan-speed
– Control sequence
– Error code
Interfaces Type of interface between controller and
room unit
PPS2
(point-to-point interface, Version 2)
Baud rate 4.8 kbit/s
Signal voltage logical 0 < 5 V
Signal voltage logical 1 > 7 V
Cable connections Connection terminals (screw terminals) Stranded or solid conductors
0.8 ... 2.5 mm
2
Cable type 2-core or 4-core, twisted pairs,
unscreened
Housing protection standard Protection standard to EN 60529 IP 30
Protection class Insulation protection class III
Ambient conditions IEC 721 Operation Transport
Ambient air conditions Class 3K5 Class 2K3
Temperature 0 ... 50 °C – 25 ... 70 °C
Humidity < 85 %rH < 95 %rH
Mechanical conditions Class 3M2 Class 2M2
Standards Electromagnetic compatibility
Interference immunity EN 61000-6-2
Interference emission EN 61000-6-3
CE compliance
Meets the requirements for CE marking as
defined in EMC directive 89/336/EEC
Dimensions See “Dimensions”
Color Front housing, key buttons
RAL9003 - signal white
Middle housing, wall bracket
RAL7038 - light grey
Weight Excluding packaging 0.119 kg