Aube Technologies RC840T manual n Application, p Typical Wiring Diagrams, o Installation

RC840T

Installation Guide

On/Off Switching Electric Heating Relay with Built-in 24 V Transformer

nApplication

The RC840T Electric Heating Relay is designed to control a line voltage resistive load from a low voltage thermostat. The RC840T relay has a built-in 24 V transformer and is compatible with 3-wire (R,C,W) thermostats as well as 2-wire mechanical and battery- operated thermostats.

The RC840T operates silently and can be installed in bedrooms, living rooms, or any other occupied area without disturbing occupants. On a call for heat, the relay is immediately activated; there is no delay. This increases temperature control and comfort.

pOnce mounting and wiring have been completed, return power to the heating system and test the installation.

qIncrease the thermostat temperature to activate the relay. Allow system operation long enough to proof installation. Once installation has been proofed, set temperature to normal setpoint.

pTypical Wiring Diagrams

NOTE: Not recommended for fast-cycling modulated regulation. For fast-cycling heating equipment, It is recommended to use the RT850 or RT850T (integrated 24 V transformer) Solid State Relay.

I

oInstallation

The RC840T must be installed in an area where the temperature is between -4°F and 140°F (-20°C and 60°C).

The RC840T can be installed on the side of an electrical box or a distribution panel or inside the wiring compartment of an electric baseboard.

Load

Low-voltage	Junction box
2-wire
thermostat	Red
	Black
	Blue

You must provide an overload protection and disconnect as required.

Figure 1 : Connection to a 2-wire low voltage thermostat

For proper installation, use a screw and a washer.

On the side of	Inside the wiring compartment
an electrical box	of a baseboard

Low-voltage 3-wire thermostat

Load

Junction box

Red

Black

Blue

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

Installation should be carried out by an electrician. Disconnect power supply before installing the relay to prevent electrical shock.

nSecure relay to the mounting surface using the two mounting brackets. Use the supplied lock nut to secure the relay to the junction box.

oWire the relay and connect according to typical wiring diagrams (refer to figures 1 & 2).

You must provide an overload protection and disconnect as required.

Figure 2 : Connection to a 3-wire low voltage thermostat

RC840T 400-276-002-C 17/1/07 1/2