resideo R847A1085 Heavy Duty Switching Relay Installation Guide
- June 6, 2024
- resideo
Table of Contents
resideo R847A1085 Heavy Duty Switching Relay
APPLICATION
The R447 and R847 are switching relays for line (R447) or low (R847) voltage
control of heavy-duty loads such as cooling compressors or electric heating.
They provide switching of relatively high current by a low-amperage
thermostat.
These relays have optional dpst or spst switching action. The R847A has an
integral transformer to provide low voltage for the control circuit; the R847B
requires an external transformer.
INSTALLATION
MOUNTING
Mount relays vertically on a firm wall or partition near the device to be
controlled, in a location that is easily accessible for installation and
service (see Fig. 1 for mounting dimensions).
To reduce transformer hum and relay noise that are sometimes amplified by
mounting surfaces of sheetmetal, plasterboard, and similar materials, place
rubber or felt washers between the case and the mounting surface.
- Position the relay and mark the screw holes.
- Start a screw in the mounting hole in upper right corner. Screw it down to 1/8 inch from the mounting surface.
- Position the case, and start the bottom screw; tighten both screws.
WIRING
All wiring must agree with applicable electrical codes, in such matters as
wire size, type of insulation, and enclosure.
Typical hookups are illustrated in Fig. 2–6. Never connect load terminals to a
load that takes more current then the amount listed in the electrical ratings
on the relay.
THE R447 AND R847 ARE FACTORY WIRED FOR DPST SWITCHING AS SHOWN IN FIGURE 2.
FOR OTHER SWITCHING, REFER TO FIG. 3, 4, 5, AND 6 FOR LOCATION OF FLEXIBLE
LEAD AND POSSIBLE ADDITION OF JUMPER.
R447 A, R847 A-B SWITCHING RELAYS
CHECKOUT
Operate system from the controller to make certain relay pulls in and drops
out as controller makes and breaks. Be sure equipment operates as intended
when the relay is energized.
SERVICE SUGGESTIONS
- Do not use oil on any part of the relay.
- The cover should be left on the relay at all times.
- Relay contacts are so arranged that they close with a wiping action and are therefore self-cleaning. The contacts may turn black after being in service for some time. This discoloration, however, does not prevent proper operation and need not be removed.
Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
95-6763—04 M.S. Rev. 05-20 | Printed in United States
© 2020 Resideo Technologies, Inc. All rights reserved.
This product is manufactured by Resideo Technologies, Inc. and its affiliates.
References
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