Honeywell RA889A User Manual
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Honeywell RA889A User Manual

Switching relay
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APPLICATION

The RA889A Switching Relay provides intermediate switching
of line- and low-voltage devices from a line- or low-voltage
controller and is typically applied in hydronic heating systems.
® U.S. Registered Trademark
Copyright © 2000 Honeywell Inc. • All Rights Reserved
Switching Relay

FEATURES

• High load switching capability.
• Troubleshooting LED.
• Push-to-test button.
• Replaceable transformer fuse.
• Long-life DC relay drive control technology.
• Relay for use with external 24 Vac or 24 Vdc supply,
with line-voltage control, or with internal 24V
transformer supply.
• One model replaces many Honeywell models. (See
Table 1 Replacement Cross Reference.)
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Mounting ...........................................................................
Wiring ...............................................................................
Operation ..........................................................................
Checkout ..........................................................................
Troubleshooting ...............................................................
RA889A
PRODUCT DATA
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68-0216-2

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Summary of Contents for Honeywell RA889A

  • Page 1: Table Of Contents

    Contents Application ................ Features ................Specifications ..............Ordering Information ............Installation ................ Mounting ................Wiring ................Operation ................Checkout ................Troubleshooting ............... ® U.S. Registered Trademark Copyright © 2000 Honeywell Inc. • All Rights Reserved 68-0216-2...

  • Page 2: Specifications

    Honeywell Inc., 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 (612) 951-1000 In Canada—Honeywell Limited/Honeywell Limitée, 155 Gordon Baker Road, North York, Ontario M2H 3N7. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

  • Page 3: Installation

    — — — R882J RA889A has one set of COM/N.O. relay contacts. Use R8845U if two sets are required. RA89A has lower output load rating. Check load requirements. INSTALLATION MOUNTING In replacement applications, mount the new relay in the same When Installing this Product .

  • Page 4: Wiring

    RA889A SWITCHING RELAY WIRING OPERATION The RA889A consists of a transformer, an Spdt line-voltage WARNING relay, an Spst low-voltage relay and wiring terminals. When line-voltage is applied to the transformer, the relay is powered Electrical Shock Hazard. on thermostat contact closure. The relay may also be used to Can cause serious personal injury or death.
  • Page 5 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED. M14301 B1 IS 1/4 IN. TAB TERMINAL. Fig. 3. RA889A hookup for L7148A/L8148A in an oil-fired, tankless hot water, zoned, pump system. T87F T87F T87F...
  • Page 6 USE COPPER CONDUCTORS ONLY. FOR ALL CLASS 1 CONNECT L1-ZC JUMPER, IF REQUIRED. CONNECTIONS, USE WIRE RATED FOR AT LEAST 167 F (75 C). M13321 Fig. 5. R8888 zone expansion using RA889A Switching Relays. THREE-WIRE TWO-WIRE LOW VOLTAGE LOW VOLTAGE...
  • Page 7 FOR SERIES 10 OR OTHER HARDWIRED ELECTRONIC 3-WIRE THERMOSTATS. WARNING! ELECTROCUTION HAZARD. POWER SUPPLY CAN CAUSE SEVERE INJURY OR DEATH. DISCONNECT POWER BEFORE WIRING OR SERVICING L1. POWERED RELAYS MUST BE WIRED AS DRY CONTACTS. M13317A Fig. 7. RA889A control options. 68-0216—2...
  • Page 8 Home and Building Control Home and Building Control Honeywell Asia Pacific Inc. Honeywell Inc. Honeywell Limited-Honeywell Limitée Room 3213-3225 Honeywell Plaza 155 Gordon Baker Road Sun Hung Kai Centre P.O. Box 524 North York, Ontario No. 30 Harbour Road Minneapolis, MN 55408-0524...

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