Aube Technologies RT850 installation instructions Application, Typical Wiring Diagrams

RT850

Installation Instructions

Electric Heating Solid-State Relay

n		p
	Application		Typical Wiring Diagrams

The RT850 Solid State Relay is designed to control a line-voltage resistive load from a 24 VAC control signal or from signal sources of 4 to 32 VDC. It can be used with fast-commuting thermostat (e.g. cycles of 15 seconds).

The RT850 is compatible with both mechanical and 2-wire or 3-wire electronic thermostats (with or without batteries).

I

oInstallation

The RT850 must be mounted on a 4” x 4” electrical box.

WARNING: The relay must be mounted so the heat sink fins are ver- tical or facing upwards. You should also provide space above the heat sink for warm air to escape. Disregarding this warning may result in improper operation of the relay. Refer to the diagram below for correct mounting guidelines.

All wiring must comply with national and local electrical code regulations.

The installation should be carried out by an electrician. Disconnect power before the installation to prevent electri- cal shock.

nPerform the wiring as per figures 1 and 2. o Secure the relay to the electrical box. p Apply power to the heating system.

qVerify the installation by increasing the setpoint temperature at the thermostat to activate the relay (the LED on the relay should light up).

WARNING: In the following wiring diagrams, the relay is illustrated sideways for the purpose of showing the terminal wiring. Refer to installation section for proper positioning of the relay.

Low-voltage

2-wire

thermostat

Black
Red
4 x 4 electrical box	External 24-VAC
	transformer
Load

You must provide an overload protection and disconnect as required.

Figure 1: Connection to a 2-wire low voltage thermostat using a 24-VAC control signal

Low-voltage

3-wire

thermostat

Black
Red
4 x 4 electrical box	External 24-VAC
	transformer
Load

You must provide an overload protection and disconnect as required.

Figure 2: Connection to a 3-wire low voltage thermostat using a 24-VAC control signal

RT850 400-274-000-D 2007-12-21 1/2