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RC840
Installation Guide
On/Off Switching Electric Heating Relay
nApplication
The RC840 Electric Heating Relay is designed to control a line voltage resistive load from a 24 V control signal.
The RC840 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.
NOTE: Not recommended for
I
oInstallation
The RC840 must be installed in an area where the temperature is between
The RC840 can be installed on the side of an electrical box or a distribution panel or inside the wiring compartment of an electric baseboard.
For proper installation, use a screw and a washer.
pTypical Wiring Diagrams
Junction box | External 24V |
| |
| transformer |
Black |
|
Red |
|
Load
You must provide an overload protection and disconnect as required.
Figure 1 : Connection to a 2-wire low voltage thermostat using a 24 V
external transformer
Junction box
External 24V transformer
Black
Red
Load
You must provide an overload protection and disconnect as required.
Figure 2 : Connection to a 3-wire low voltage thermostat using a 24 V
external transformer
On the side of | Inside the wiring compartment |
an electrical box | of a baseboard |
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 and 3).
pOnce mounting and wiring have been completed, return power to the heating system and test the installation.
q Increase the thermostat temperature to activate the relay. Allow |
Junction box
Black
Red
Load
Junction box
Black
Red
Load
External 24V transformer
system operation long enough to proof installation. Once |
installation has been proofed, set temperature to normal |
setpoint. |
You must provide an overload protection and disconnect as required. Transformer VA output = RC840 Quantity x 1.2 VA
Figure 3 : Connection to a 2-wire low voltage thermostat using a 24 V
external transformer and multiple relays
RC840 | 17/1/07 | 1/2 |