Ouellet RT850 - Manual

1/2 400-274-004-B
RT850T
Application
The RT850T Solid State Relay is designed to control a line voltage
resistive load from a 24 V control signal or dry contact.
With its unique thermal bridge design, the RT850T allows for
efficient heat dissipation and also features an LED indicator for
visual confirmation of product switching.
This electronic switching relay provides fast commuting operation;
when the RT850T is combined with a short-cycled thermostat
(15 seconds), it provides more precise temperature control.
The RT850T 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. Main applications include control of
electric heating systems.
Installation
The RT850T must be mounted where ambient temperature is from
-4°F to 140°F (-20°C to 60°C).
The RT850T must be mounted on a 4 x 4 electrical box for proper
operation.
WARNING: The relay must be mounted so the heatsink’s fins are
vertical or facing upwards. You should also provide an empty space
above the heatsink so the warm air can exit the heatsink area.
Disregarding this warning may result in improper operation. Refer to
diagrams below for correct mounting guidelines.
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 pre-
vent electrical shock.
n
Wire the relay and connect according to typical wiring diagrams
(refer to figures 1 & 2).
o
Secure relay to the electrical box using the two mounting holes.
p
Once mounting and wiring have been completed, return power
to the heating system.
q
Increase thermostat temperature in order to activate the relay
(LED should be ON). Allow system operation long enough to
proof installation.
r
Once installation has been proofed, set temperature to normal
operating setpoint.
Typical Wiring Diagrams
NOTE: Relay is shown sideways for a general overview of wiring
and connections. The RT850T must be positioned as follows:
Figure 1: Connection to a 2-wire low voltage thermostat
Figure 2: Connection to a 3-wire low voltage thermostat
You must provide an overload protection and disconnect as required .
You must provide an overload protection and disconnect as required .
RT850T - Installation Instructions
Electric Heating Solid State Relay with Built-in 24 V Transformer