User Manual

Building Technologies / HVAC Products CE1G2725en 23.03.2005 3/4
STOP
Note!
• All Input and bus terminals are not protected
against connection to AC 230 V.
• Observe the technical data for fan relay outputs:
Max. AC 250 V, 6(4) A.
• All output cables used must satisfy the insulation
requirements with regard to mains potential.
• AC 24 V outputs must be segregated from AC 250 V
outputs.
• Care should be taken when cables pass through
sharp metal openings, conduits or ducts.
• Double insulation on output cables is recom-
mended.
• Local installation regulations must be observed.
Commissioning
Preparatory checks
1. DO NOT switch on power
2. Check wiring according to the plant connection dia-
gram
3. Ensure correct position of Dip switch settings to match
the HVAC equipment. See Dip settings
4. The pre-configured application is selected by the Dip
switch located at the top of the controller
5. When switching on power
− The pwr LED on the RRV851 will be on
− The QAX850 will display all LCD icons for 3 sec-
onds and then the software version number for an-
other 3 seconds. It will then revert to normal mode.
Time segments will be blinking if time needs to be
set
− The LED on the QAX850 will be flashing if there is
a communication error between the RRV851 and
QAX850
• Power must be switched off to reset application
• An adhesive label is included in the packaging for final
recording of Dip switch positions
Digital inputs (D1, D2)
• A potential free contact closed across the D1 and G
terminals will override to comfort when mode selector is
set to Auto timer mode only
• D2 can be configured for an emergency heat enable
signal or an external fault lockout signal. Either of these
functions can be selected via the configuration Dip
switches
• When emergency heat is selected, a potential free con-
tact closed across the D2 and G terminals will disable
the primary heating output and enable the emergency
heat output. The emergency heat output will only acti-
vate when there is demand for heating
• When external fault (default) is selected, a potential free
contact closed across the D2 and G terminals will de-
activate all outputs and the standby icon on the QAX850
LCD will flash to indicate the fault. Fault will disappear
after contact is opened
Dip settings
Function Selections 1 2 3 4 5 6 7
Auxiliary heat 20 min delay off off - - - - -
Auxiliary heat 10 min delay on off - - - - -
Emergency heat via D2 off on - - - - -
Y3
Aux. output
2
nd
stage cool or compressor on on - - - - -
Single speed - - off - - - - Fan speed
Three speed - - on - - - -
A1 - Heat only - - - off off off off
A2 - Cool only - - - on off off off
A3 - Cool / (heat 3 speed fan) - - - off on off off
A4 - Cool / (heat 1 speed fan) - - - on on off off
A5 - Heat pump (comp + RV) - - - off off on off
A6 - Heat pump (heat/cool) - - - on off on off
A7 - 4 pipe FCU - - - off on on off
Applications
A8 - 2 pipe FCU - - - on on on off
Installer level parameter settings
• Default parameter values are suitable for basic system
operation. If default values are not suitable for a particu-
lar installation, then adjustment can be made. Refer to
application sheets for default values or follow the instruc-
tions below
1. Simultaneously press together the
and buttons
on the QAX850 for 3 seconds, release, within 2 sec-
onds press the
button for 3 seconds
2. P00 will appear on the LCD
3. Press
to view the parameter
4. Press
or for adjustment
5. Press
to save the adjustment
6. Continue through all the parameter list to return to
normal mode
Time out
• If no adjustment is made within 20 seconds while chang-
ing parameter values, the controller will exit and return to
normal mode
Setting elements on QAX850 master room unit
1
2
1 Navigation buttons: adjusting or searching values
2 OK button: confirming values