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Installation
Wiring Overview
The Viking is a DIN rail mounted device that has been designed to precisely control a wide selection
of HVAC systems in commercial applications. Great effort has been made to ensure the Viking is
very simple to set up and install ensuring reliable control of commercial HVAC systems.
A brief input / output explanation is provided below, further function specific detail is provided
through this manual.
Powering the Viking
The Viking can be powered from either 24VAC (+/-15%) or from 100 to 270 VAC.
Use one power input only.
The A&N input is used for powering the Viking from line voltage (270V max).
The terminal marked G is the 24V active terminal; the Go is the 24V common terminal.
Equipment Connections
A common input is provided for the main 5 equipment relays while a separate relay common is
provided for the 6
th
, auxiliary relay input. The 6
th
Auxiliary Function relay has multiple installer
selected functions so a separate voltage can be used with this relay if necessary. See page 17 for
more information on this relays capabilities.
A change over relay is provided for first stage heating and cooling should the Viking need control
drive open/drive closed valves. All other relays are single pole normally open.
All relays are rated at up to 300V, the Fan relay is rated at 12Amps resistive; all other relays are
rated at 5Amps resistive maximum. It is recommended that an external fuse be used to protect the
Viking relays or the equipment that the Viking is controlling.
Do not exceed the maximum current handling capacity of any of the Viking relays.
