Aube Technologies RC840 User manual
RC840 400-276-000-D30/4/20 1/2
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 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
The RC840 must be installed in an area where the temperature is
between -4°F and 140°F (-20°C and 60°C).
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.
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.
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.
Figure 1 : Connection to a 2-wire low voltage thermostat using a 24 V
external transformer
Figure 2 : Connection to a 3-wire low voltage thermostat using a 24 V
external transformer
Figure 3 : Connection to a 2-wire low voltage thermostat using a 24 V
external transformer and multiple relays
nApplication 1.
oInstallation 2.
On the side of
an electrical box
Inside the wiring compartment
of a baseboard
For proper installation, use
a screw and a washer.
pTypical Wiring Diagrams 3.
You must provide an overload protection and disconnect as required.
External 24V
transformer
Low-voltage
2-wire
thermostat
Load
Junction box
Black
Red
You must provide an overload protection and disconnect as required.
External 24V
transformer
Low-voltage
3-wire
thermostat
Load
Junction box
Red
Black
You must provide an overload protection and disconnect as required.
Transformer VA output = RC840 Quantity x 1.2 VA
External 24V
transformer
Low-voltage
2-wire
thermostat
Load
Load
Junction box
Junction box
Red
Black
Red
Black
RC840
Installation Guide
On/Off Switching Electric Heating Relay
400-276-000-C (RC840) ENG.fm Page 1 Wednesday, January 17, 2007 3:48 PM
RC840 400-276-000-D30/4/20 2/2
Ensure ratings are suitable for your application.
Ambient operating temp.: -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: 7 oz. (198 g)
Terminal wire size: 12 AWG
Certification:
qElectrical Specifications 4.
Voltage (VAC) 120 208 240 277 347
Resistive load (A) 22 22 22 19 18
Inductive load (HP) 0.8 1.0 1.5
FLA 16 13 12
LRA 42
Control signal 24 V / 40 mA / 1 VA
rRC840 Dimensions 5.
Dimensions are expressed in INCHES [MM]
;Warranty 6.
400-276-000-C (RC840) ENG.fm Page 2 Wednesday, January 17, 2007 3:48 PM
Resideo warrants this product, excluding battery, to be free from defects in
workmanship or materials, under normal use and service, for a period of three (3)
years from the date of first purchase by the original purchaser. If at any time during
the warranty period the product is determined to be defective due to workmanship or
materials, Resideo shall repair or replace it (at Resideo’s option).
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
(ii)(ii) call Resideo Customer Care at 1-468-1502. Customer Care will make the
determination whether the product should be returned to the following address:
Resideo Return Goods, 1985 Douglas Dr. N., Golden Valley, MN 55422, or whether a
replacement product can be sent to you.
This warranty does not cover removal or reinstallation costs. This warranty shall not
apply if it is shown by Resideo that the defect was caused by damage which occurred
while the product was in the possession of a consumer.
Resideo’s sole responsibility shall be to repair or replace the product within the terms
stated above. RESIDEO SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF
ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES
RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY
WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS
PRODUCT.
Some states 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 RESIDEO MAKES ON
THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING
THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, IS HEREBY LIMITED TO THE THREE YEAR DURATION OF THIS
WARRANTY. Some states do not allow limitations on how long an implied warranty
lasts, so the above limitation may not apply to you.
This warranty gives you specific legal rights, and you may have other rights which
vary from state to state. If you have any questions concerning this warranty, please
write Resideo Customer Care, 1985 Douglas Dr, Golden Valley, MN 55422 or call
1-800-468-1502.
© 2020 Resideo Technologies, Inc. All rights reserved.
This product is manufactured by Resideo Technologies, Inc. and its affiliates.
www.resideo.com
Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
400-276-000-DM.S. Rev. 04-20 | Printed in United States
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