Page 28
Economy Checklist.
1
Wire the fresh, return and relief / spill dampers to the Viking analogue outputs. Note which
Viking output is controlling which damper. For example analogue output 1 (Y1) can be set
to control the return air damper while analogue output 2 (Y2) is may be set to control the
fresh air & spill damper (as shown in the example above).
2
Wire the room temperature sensor to the Viking (2 wire or 4 wire versions of the sensors
are acceptable) and wire the
4 wire Smart Sensor
to the S1, S2, S3, S4 terminals.
Set all 4
DIP switches in the outside Smart Sensor to ON
(This will define the sensor function as
outside air sensing). See the manual supplied with the Smart Sensor for more details on
switch settings and other functions of the Smart sensor.
3
Enter the installer menu and set up the analogue outputs in the Viking to match the
damper wiring. Enter the menu “Change Analogue Output Settings?” menu
in the installer
and Set AO1 = Return, Set AO2 = Fresh. Press <F2> Save. Page 20 details the analogue
output settings within the Viking.
4
In the installer menu enter the “Change Economy Settings?” menu.
Confirm Economy =
ON. Press <F2> Save. Page 20 gives more detail on this.
5
Press & Hold the Back button <F3> to exit the installer menu.
6
Economy cycle is now setup.
Information on wiring Smart Sensors to the Viking is provided on page 11.
Should you wish to test correct damper operation
–
Enter the Economy mode in the installer menu
“Change Economy Settings?
Change Economy ON to TEST. Exit the installer menu. The Economy LED
will be on and the
LCD will show “Economy Test”. The fresh air damper will
be held at 10V and the
return air damper will be held at 0V.
You must exit economy mode test mode manually by setting economy mode back to Economy = ON.
(If you forget the Viking will automatically exit economy test menu after 1 hour).
Economy Logic
The economy cycle of the Viking is used before stage 1 cooling is required and starts 0.1°C above
the cooling set point if the outside air is suitable. If the indoor fan is in Auto Mode (Cyclic fan) and
not running when the Economy Function is required the Viking will automatically start the indoor
fan.
If after some time the desired room temperature is not reached or in fact becomes warmer the
Viking will automatically suspend the outside air function and replace it with normal A/C cooling to
bring the room to set point. Economy Cycle function will be suspended.
(In these cases the Economy
LED will flash to indicate the outside air on its own is not capable of maintaining the target
temperature.)
Please Note - Economy is used as first stage cooling ONLY and is designed to maintain a comfortable
temperature in the most economical manner possible.
If the cooling set point and room temperature are far apart as would be the case of setting a very
low cool set point for testing then economy will NOT be used as the Viking will immediately call for
