Honeywell RA889A Switching Relay Instructions

Honeywell RA889A Switching Relay

Specifications

• Electrical Ratings:
  • Voltage: 120 Vac, 60 Hz
  • Thermostat Heat Anticipator Setting: 0.12A
• Transformer Ratings:
  • Primary: 120 Vac, 60 Hz
  • Secondary: 24 Vac, 12 VA maximum, 9 VA available for external loads
  • Secondary protected by replaceable 1A automotive fuse
• Contact Ratings: 15 AFL, 30 ALR; maximum connected load 2000 VA
• Humidity Ratings: 0 to 90% rh, non-condensing
• Electrical Connections: No. 8 captivated wire clamp screw terminals
• Finish: Zinc-plated steel
• Knockouts:
  • Case Bottom: Three 1/2 in. (13 mm) for conduit box
  • Case Top : One 7/8 in. (22 mm) for wiring
• Approvals:
  • Underwriters Laboratories Inc. Listed: File no. E4436, Guide no. XAPX
  • Canadian Underwriters Laboratories Inc. Listed: Guide no. XAPX7

Product Usage Instructions

Installation

1. Ensure power is turned off before installing the switching relay.
2. Mount the switching relay using the keyhole type mounting hole and the provided screws.
3. Make electrical connections using the No. 8 captivated wire clamp screw terminals.
4. Use the knockouts on the case bottom for the conduit box and the case top for wiring.

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
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.

SPECIFICATIONS

IMPORTANT: The specifications given in this publication do not include normal manufacturing tolerances. Therefore, this unit may not exactly match the listed specifica-tions. Also, this product is tested and calibrated under closely controlled conditions, and some minor differences in performance can be expected if those conditions are changed.

• TRADELINE® Model: RA889A Switching Relay with 24V controller for switching one-line voltage load.
• Electrical Ratings:
• Voltage: 1 20 Vac, 60 Hz.
• Thermostat Heat Anticipator Setting: 0.12A.
• Transformer Ratings:
• Primary: 120 Vac, 60 Hz.
• Secondary: 2 4 Vac, 12 VA maximum, 9 VA available for external loads. Secondary protected by replaceable 1A automo-tive fuse.
• Contact Ratings: 15 AFL, 30 ALR; maximum connected load 2000 VA.
• Temperature Ratings: Ambient: -20°F to 120°F (-29°C to 49°C).
• Humidity Ratings: 0 to 90% rh, non-condensing.
• Switching Action: Spdt, plus Powerpile® rated low voltage Spst relay.
• Electrical Connections: No. 8 captivated wire clamp screw terminals.
• Finish: Zinc plated steel. Knockouts:
• Case Bottom: Three 1/2 in. (13 mm) for conduit box.
• Case Top: One 7/8 in. (22 mm) for wiring. Approvals:
• Underwriters Laboratories Inc. Listed: File no. E4436, Guide no. XAPX.
• Canadian Underwriters Laboratories Inc. Listed: Guide no.XAPX7.

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:

1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Logistics
   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.

• Cross Reference: T he RA889A replaces many Honeywell models. See Table 1 for additional cross reference information.
• Thermostat Compatibility: All Honeywell electromechanical and most electromechanical 2- or 3-wire. Select thermostats with 0.12A heating anticipator setting to match the electrical rating of the switching relay.
• Replacement Parts: 32002190-001 Replacement Relay. Relay Fuse: 1A automotive fuse.

Table 1. RA889A Replacement Cross Reference.

• a RA889A has one set of COM/N.O. relay contacts. Use R8845U if two sets are required.
• b RA89A has lower output load rating. Check load requirements.

INSTALLATION

When Installing this Product . . .

1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condi-tion.
2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.
3. Installer must be a trained, experienced service techni-cian.
4. After installation is complete, check out product opera-tion as provided in these instructions.
5. Follow local codes for installation and application.

WARNING

• Electrical Shock Hazard.
• Power supply can cause severe injury or death. Transformer core not bonded.
• Disconnect power supply before wiring.

MOUNTING

In replacement applications, mount the new relay in the same location as the old relay. For new installations, locate the relay vertically on a solid wall or partition as close as possible to the device to be controlled. Select a location that is easily accessible for installation and service.

NOTE: To reduce the possible transformer hum and relay noise that is sometimes amplified by mounting sur-faces such as sheet metal, plasterboard, and similar materials, place rubber or felt washers between the case and the mounting surface.

1. Position the relay and mark the mounting holes. See Fig. 1.
2. Start a screw in the upper right corner for the keyhole type mounting hole. Screw it down within about 1/8 in.(3 mm) of the surface.
3. Hang the relay on the screw, position the case, and start the bottom screw.
4. Tighten both screws.

WIRING

WARNING: Electrical Shock Hazard.
Can cause serious personal injury or death. Use only NEC Class 1 wire for all line voltage wiring connections. Class 1 wires must be rated for at least 167°F (75°C).

All wiring must comply with all applicable electrical codes, ordinances, and regulations. Follow all instructions furnished with the controlled equipment.

IMPORTANT: The switching relay terminals are approved only for use with copper wires.
When two or more line-voltage load devices are to be controlled in parallel, the total current must not exceed the rating for the relay load. Never connect load terminals to a load that uses more current than the amount listed in the electrical ratings on the relay. See Table 3 for wiring length specifications. See the schematic and typical hookups in Fig. 2 through 7.

Table 2. Wire Lengths.

Fig. 2. RA889A internal schematic and typical hookup.

OPERATION

The RA889A consists of a transformer, an Spdt line-voltage relay, an Spst low- voltage relay and wiring terminals. When line-voltage is applied to the transformer, the relay is powered on thermostat contact closure. The relay may also be used to provide electrical isolation in low-voltage circuits, if powered from a 24 Vac or 24 Vdc external source connected to W(T) and C. Fiber barriers separate line- and low-voltage connections.

CHECKOUT

1. Keep the cover on the relay during normal operation and remove only for service and checkout.
2. Relay contacts require no cleaning; they are arranged to close with a wiping action and are self-cleaning. The contacts may turn black after being in service for some time; this discoloration does not prevent proper opera-tion.
3. After installation is complete, operate system through at least one cycle from the controller to make certain the relay controls the equipment as intended.

TROUBLESHOOTING

Test Button
This connection is the same as a call for heat connection between the R(T) and W(T) terminals.

Relay LED
This LED lights whenever there is 120 Vac (L1) on the N.O. terminal (when COM/N.O. relay contacts are closed).

• POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
• CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.
• B1 IS 1/4 IN. TAB TERMINAL.

Fig. 3. RA889A hookup for L7148A/L8148A in an oil-fired, tankless hot water, zoned, pump system.

Fig. 4. RA889A hookup for L7148F/L8148E in a gas-fired, 24V, zoned, pump system.

1. CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.
2. USE COPPER CONDUCTORS ONLY. FOR ALL CLASS 1 CONNECTIONS, USE WIRE RATED FOR AT LEAST 167°F (75°C).
3. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
4. CONNECT L1-ZC JUMPER, IF REQUIRED.

Fig. 5. R8888 zone expansion using RA889A Switching Relays.

Fig. 6. RA889A thermostat connections.

• A. FOR 24V THERMOSTAT CONTROL
• B. FOR LINE VOLTAGE CONTROL
• C. FOR EXTERNAL SEPARATE LOW VOLTAGE POWER SOURCE

1. REQUIRED FOR OUTPUT LED OPERATION.
2. FOR SERIES 10 OR OTHER HARDWIRED ELECTRONIC 3-WIRE THERMOSTATS.
3. 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.

Fig. 7. RA889A control options.

Home and Building Control Honeywell Inc.

• Honeywell Plaza
• P.O. Box 524
• Minneapolis, MN 55408-0524

Honeywell Latin American Region

• 480 Sawgrass Corporate Parkway Suite 200
• Sunrise FL 33325

Home and Building Control

• Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road
• North York, Ontario
• M2H 3N7

Honeywell Europe S.A.

• 3 Avenue du Bourget
• 1140 Brussels
• Belgium

Honeywell Asia Pacific Inc.

• Room 3213-3225
• Sun Hung Kai Centre
• No. 30 Harbour Road Wanchai
• Hong Kong

Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers.
www.honeywell.com

FAQ

• Q: How do I install the RA889A switching relay?
  • A: Follow the installation instructions provided in the user manual. Ensure power is turned off before installation.
• Q: What thermostats are compatible with the RA889A?
  • A: The RA889A is compatible with all Honeywell electromechanical and most electromechanical 2- or 3-wire thermostats. Select thermostats with a 0.12A heating anticipator setting.
• Q: Can the RA889A replace other Honeywell models?
  • A: Yes, the RA889A can replace many Honeywell models. Refer to Table 1 for cross-reference information.

References

• Honeywell - The Future Is What We Make It
• Manual-Hub.com – Free PDF manuals!

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