User Manual

4/5 23.03.2005 CE1G2727en Building Technologies / HVAC Products
Setting elements on QAX850 master room unit
1
2
1 Navigation buttons: adjusting or searching values
2 OK button: confirming values
Zone set-up
• The individual zone weight for each zone must be se-
lected based on the zone load (i.e.: zone air outlet flow
rate) in comparison to other zones. Zone weight parame-
ter P22 can be applied to each zone as per the following.
• None – Local damper control only. Zone has no
effect on plant heat/cool and fan speed control.
• Small – Smaller zone with low air outlet flow rate
compared to other zones (i.e.: 2
nd
bedroom).
• Medium – Medium sized zone compared to other
zones (i.e.: Master bedroom).
• Large – Large zone with higher air outlet flow rate
compared to other zones (i.e.: Main living/dining
area).
Sensor calibration
• Generally there is no need to calibrate sensor, however
the displayed room temperature on the QAX850 and
QAW850 LCD can be calibrated if there is any discrep-
ancy from the actual temperature measured with a certi-
fied thermometer. Calibration function can be accessed
by pressing the
and buttons simultaneously for 5
seconds. Displayed value can then be adjusted via the
same buttons in 0.1K steps. Range is +/- 3K.
Parameter list
Line Function, display Range
Explanations, notes and tips
P00 Temperature scale °C/ F°
P01 Frost protection limit in OFF mode Off/5..8°C
If temp is below the set limit, heating will be activated.
P02 Over-temperature limit in OFF mode Off/30..35°C
If temp is above the set limit, cooling will be activated.
P03 Min. OFF time delay 0..600s
Min off time is used to prevent short cycling of compressor.
P04 Min. ON time delay 0..600s
Min on time is used to prevent short cycling of compressor.
P05 Dead band between cool and heat
OFF points
0.5..6K
Zero energy band. When actual temp is in dead band, outputs are off.
P06 RV ON in heat or cool mode Heat/Cool
The reversing valve (RV) can be energized in cooling or heating demand.
Dependent on the internal equipment circuitry.
P07 Fan run ON after heat output turns
Off
0..300s
Fan run ON delay is used to remove the residual heat and to prevent the
high limit electric heater thermostat from tripping off.
P08 Fan run ON after cool output turns
Off
0..300s
Fan run ON delay can be used to make use of residual cooling and to re-
move condensation.
P09 FCU flush pipe time 120..600s
On start up, the controller will open the valve (flush time) and the sensor will
detect for hot or chilled water in the system. Only for 2-pipe FCU, appl. A8.
P10 Zone heat/cool inhibit Heat/Cool/No
Heating or cooling mode can be disabled for individuals zones.
P11 Water temp heat mode changeover 22..32 °C
Only for 2-pipe FCU appl A8. This is the water temp setpoint for heating.
P12 Water temp cool mode changeover 10..21 °C
Only for 2-pipe FCU appl A8. This is the water temp setpoint for cooling.
P13 Fan auto-speed high range H:80..100% Switching point for high speed fan.
P14 Fan auto-speed medium range M:30..75% Switching point for medium speed fan.
P15 Fan auto-speed low range L:1..15% Switching point for low speed fan is only applicable for 3-position modulat-
ing control. For 2-position control, low speed fan synchronizes with the first
stage heating/cooling switch on and switch off points.
P16 Window contact zone off activation NO/NC Digital input on QAW850. Overides zone to off mode.
P17 2-p or 3-p control selection 2-p/3-p 3-position modulation control is possible for appl. A1, A2 and A8.
P18 Heating demand P-band/Switching
differential
0.5..10K Heating demand proportional band for zone and total demand calculations.
Applicable to 3P modulating and on/off applications.
P19 Cooling demand P-band/Switching
differential
0.5..10K Cooling demand proportional band for zone and total demand calculations.
Applicable to 3P modulating and on/off applications.
P20 Demand integration time 0..60.0 min in
0.5 min steps
Heating/cooling demand integration time for zone and total demand calcu-
lations. Applicable to 3P modulating and on/off applications.
P21 3-p valve actuator running time 50..300s Valve actuator run time. Refer to the technical data of the actuator for this
value.
P22 Zone capacity weight
The (zone weighted) total system
heat/cool demand is calculated by
the RRV856 controller for plant
heating/cooling and fan speed out-
put control
None
Small
Medium
Large
None – Local damper control only. Zone has no effect on plant heat/cool
and fan speed control.
Small – Smaller zone with low air outlet flow rate compared to other zones
(i.e.: 2
nd
bedroom).
Medium – Medium sized zone compared to other zones (i.e.: Master bed-
room).
Large – Large zone with higher air outlet flow rate compared to other zones
(i.e.: Main living/dining area).
P23 Ventilation in dead zone Off, H/C, C
only
When the temp is in dead zone, the fan can be set to run continuously.
When C only is selected, fan turns off with the heating output but continues
to run after cooling output turns off.
*Default values and available parameters are dependent on application selected.
*Refer to application sheets for further details if required.