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RC840T  
Installation Guide  
On/Off Switching Electric Heating Relay with Built-in 24 V Transformer  
1
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Application  
p Once mounting and wiring have been completed, return power  
n
to the heating system and test the installation.  
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.  
q Increase 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.  
(
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.  
3.  
p Typical Wiring Diagrams  
Load  
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
2
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Installation  
o
Low-voltage  
-wire  
thermostat  
Junction box  
2
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.  
Red  
Black  
Blue  
You must provide an overload protection and  
disconnect as required.  
Figure 1 : Connection to a 2-wire low voltage thermostat  
Load  
For proper installation, use  
a screw and a washer.  
Junction box  
Low-voltage  
-wire  
thermostat  
3
Red  
Black  
Blue  
On the side of  
an electrical box  
Inside the wiring compartment  
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.  
You must provide an overload protection and  
disconnect as required.  
Figure 2 : Connection to a 3-wire low voltage thermostat  
n Secure relay to the mounting surface using the two mounting  
brackets. Use the supplied lock nut to secure the relay to the  
junction box.  
o Wire the relay and connect according to typical wiring diagrams  
(refer to figures 1 & 2).  
RC840T  
400-276-002-C  
17/1/07  
1/2  
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4
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6.  
Electrical Specifications  
Ensure ratings are suitable for your application.  
Warranty  
;
AUBE warrants this product, excluding battery, to be free from  
defects in the workmanship or materials, under normal use and ser-  
vice, for a period of three (3) years from the date of purchase by the  
consumer. If at any time during the warranty period the product is  
determined to be defective or malfunctions, AUBE shall repair or  
replace it (at AUBE's option).  
q
Voltage (VAC)  
Resistive load (A)  
Inductive load (HP)  
FLA  
208  
22  
240  
22  
277  
19  
347  
18  
1.0  
13  
1.5  
12  
If the product is defective,  
(i) return it, with a bill of sale or other dated proof of purchase, to  
the place from which you purchased it, or  
LRA  
42  
24 VAC / 40 mA / 1.2 VA  
(
ii) contact AUBE. AUBE will make the determination whether the  
product should be returned, or whether a replacement product  
can be sent to you.  
Control signal  
This warranty does not cover removal or reinstallation costs. This  
warranty shall not apply if it is shown by AUBE that the defect or mal-  
function was caused by damage which occurred while the product  
was in the possession of a consumer.  
AUBE's sole responsibility shall be to repair or replace the product  
within the terms stated above. AUBE SHALL NOT BE LIABLE FOR  
ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCI-  
DENTAL OR CONSEQUENTIAL DAMAGES RESULTING,  
DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WAR-  
RANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF  
THIS PRODUCT. Some provinces, states or regions do not allow the  
exclusion or limitation of incidental or consequential damages, so this  
limitation may not apply to you.  
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY AUBE  
MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED  
WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANT-  
ABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS  
HEREBY LIMITED TO THE THREE-YEAR DURATION OF THIS  
WARRANTY. Some provinces, states or regions do not allow limita-  
tions on how long an implied warranty lasts, so the above limitation  
may not apply to you.  
Transformer ratings: 24 VAC / 1.2 VA / Class 2  
Ambient operating temperature: -4°F to 140°F (-20°C to 60°C)  
Ambient storage: -40°F to 175°F (-40°C to 80°C)  
Humidity limits: 0 to 95% non-condensing  
Net weight: 11.5 oz. (326 g)  
Terminal wire size: 12 AWG  
Certification:  
5
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r RC840T Dimensions  
This warranty gives you specific legal rights, and you may have other  
rights which vary from one province, state or region to another.  
7
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Customer Assistance  
If you have any questions on the product installation or operation,  
contact us at:  
705 Montrichard Avenue  
Saint-Jean-sur-Richelieu, Quebec  
J2X 5K8  
Canada  
Tel.: (450) 358-4600  
Toll-free: 1-800-831-AUBE  
Fax: (450) 358-4650  
Email: aube.service@honeywell.com  
For more information on our products, go to  
www.aubetech.com  
Dimensions are expressed in INCHES [MM]  
RC840T  
400-276-002-C  
17/1/07  
2/2