Page 32
Master
–
Set Aux Relay F
unction to “
Master
”
Mode in the installer menu, see details on
page 17. This will close the Aux Relay whenever the master Viking is running
Should the Viking receive a call to run outside scheduled hours.
Slave
–
Set program mode to Manual Mode (Installer Menu Options, page 14
“Change
Programming Options”
) and also set Aux input to delay start. (Installer Menu
Options on page 19 -
“Change Axillary Input Options”
).
Note: If all Vikings are powered from the same 24V supply, ensure all auxiliary input commons
are wired together as shown in the above example or feedback loops may occur.
Auto/On/Off Wiring
Many buildings require an Auto/On/Off
switch in their switchboard to control
their HVAC systems. The Viking can
accommodate this in a number of ways,
one example is shown here.
Use the installer menu to set Aux input 1
as forced ON and Aux input 2 as Auto
(see Installer Menu
“Change Auxiliary
Input Options”
- Page 19)
(ver 2.9 or later)
In the Auto position the Viking will run its
normal 7 day or 365 day schedule. In the
On
position the Viking will use the “Start” program temperatures and fan mode for as long as this
switch is closed. In the OFF position the Viking will shut down.
If one of the Auxiliary inputs is needed for another function, such as an occupancy input, then the
Viking can also be shut down by open circuiting the room temperature sensor for example.
Smart Sensors
The Viking has a communications port designed to read and pass information to a selection of 4
wire “Smart Sensors” that
enhance the Viking
’
s control capabilities. These sensors are set as either
Indoor Sensor or Outdoor Sensors via switches within the sensor. Multiple indoor sensors can be
wired in parallel with an outdoor sensor if required.
These sensors are useful should the distance between the Viking and the sensing location be
extremely long as they are not affected by the length of cable runs
etc.
Temp & RH Sensor
–
This sensor is required as an outdoor sensor
when the Viking is controlling economy based on air enthalpy rather
than simply dry bulb temperature. This sensor can be provided with
or without a temperature display and with run and fault indication.
Manual On/Off operation can also be provided if required.
