Honeywell R856A Fan Center Instruction Manual
- June 17, 2024
- Honeywell
Table of Contents
Honeywell R856A Fan Center
Product Information
Specifications
- Models: R856A, R856B, R856D
- Primary Power Supply: R856A – 24 volts AC, R856B – 120 volts AC, R856D – 120 volts AC
- Relay Coil Rating: Sealed-9 VA, Inrush-32 VA, Sealed current-0.375 Amp
- Wiring Terminals: Quick connect and screw type terminals for line voltage loads; screw connections for low voltage wiring. Standard screw terminals are for No. 8 wire.
- Additional Features: Tradeline package with cross-reference label and special instruction sheet.
FAQ
- Q: What are the available models of the R856 Fan Centers?
- A: The available models are R856A, R856B, and R856D.
- Q: What is the primary power supply for each model?
- A: The primary power supply is as follows: R856A – 24 volts AC, R856B – 120 volts AC, R856D – 120 volts AC.
- Q: What are the electrical ratings for the different models?
- A: The electrical ratings vary depending on the model. Please refer to the product information section for detailed electrical ratings.
- Q: How do I order the R856 Fan Centers?
- A: When ordering, refer to the Tradeline number or catalog specifications. Specify the model number, fan relay switching, transformer supply voltage, and contactor terminal connectors if using a No. 6 wire.
- Q: Where can I order the R856 Fan Centers?
- A: You can order from your usual source or directly from Honeywell. The address for Honeywell in Minneapolis, Minnesota is 1885 Douglas Drive North. For orders in Canada, contact Honeywell Controls Limited at 740 Ellesmere Road, Scarborough, Ontario.
Introduction
R856 FAN CENTERS EVAPORATOR FAN
- These fan centers are used with heatingcooling thermostat and subbase combinations such as the T87-4539, T872-4672, or T834-4634.
- All R856 Fan Centers provide line voltage spst, spdt, or dpst switching.
- R856B and D have integral 45 va transformer to supply low voltage power for the system.
- R856D includes a spst thermal delay relay to prevent short cycling the compressor motor.
- Low voltage terminal strip for thermostat and panel connections.
- Case and cover on all models.
- Models available to speed fan motors. control single or two
- Models available with dpst 20 amp co Intactor for switching heavy duty 240v loads.
SPECIFICATIONS
TRADELINE MODELS
Tradeline models are selected and packaged to provide ease of stocking, ease of handling andmaximum replacement value. Tradeline model specifications are the same as those of standard models except as noted below.
TRADELINE MODELS AVAILABLE:
- R856A Fan Center-spdt fan switching.
- R856B Fan Center-spdt fan switching; includes 45 va transformer.
- R856D Fan Center-spdt fan switching; includes 45 va transformer and spst thermal delay relay.
PRIMARY POWER SUPPLY:
- R856A—24 volts ac.
- R856B—120 volts ac.
- R856D—120 volts ac.
RELAY COIL RATING
- Sealed—9 va
- Inrush—32 va
- Sealed current—. 375 amp
WIRING TERMINALS
- Quick connect and screw type terminals for line voltage loads; screw connections for low voltage wiring. Standard screw terminals are for No. 8 wire.
ADDITIONAL FEATURES
- Tradeline package with cross reference label and special instruction sheet.
STANDARD MODELS
MODELS
- R856A Fan Center-switching is spst normally open, spdt, or apst normally open.
- R856B Fan Center-switching is spst normally open, spdt normally open. Includes 45 va trans- former.
- R856D Fan Center-switching is spst normally open, spdt, or dpst normally open. Transformer and spst thermal delay relay.
ELECTRICAL RATINGS
Spst and spdt models
Dpst models
TRANSFORMER VOLTAGE
- R856A—24v at 60 Hz.
- R856B-120 or 240v ac, 60 Hz (specify when ordering).
- R856D— 120v ac, 60 Hz.
TRANSFORMER EXTERNAL LOAD
R856 Fan Centers with transformers will operate the following Honeywell relays and contactors with up to 300 feet of No. 18 gauge wire (150 ft. run):
- two R8230 or R8222 Relays;
- one R850 Contactor;
- one R8230 or R8222 Relay and one R850 Contactor;
- one R850 Contactor and one R8093 Thermal Delay Relay;
- one R8210, R8212 or R8214 Contactor;
- one R8210, R8212 or R8214 Contactor and one
- R8230 or R8222 Relay;
- one R8210, R8212 or R8214 Contactor and one
- R8093 Thermal Delay Relay or two R850 Contactors.
WIRING TERMINALS
- Color coded leadwires for line voltage loads; screw connections for low voltage wiring.
- Except R856B dpst models which have quick connect and screw terminals for up to No. 8 wire for line voltage loads.
RELAY COIL RATINGS
FINISH: Gray enamel.
ORDERING INFORMATION
WHEN ORDERING REFER TO THE TRADELINE CATALOG OR PRICE SHEETS FOR COMPLETE ORDERING SPECIFICATION NUMBER, OR …
SPECIFY
- MODEL NUMBER.
- FAN RELAY SWITCHING.
- TRANSFORMER SUPPLY VOLTAGE.
- CONTACTOR TERMINAL CONNECTORS NO. 115182, IF NO. 6 WIRE IS TO BE USED.
ORDER FROM
- YOUR USUAL SOURCE, OR
- HONEYWELL
- 1885 DOUGLAS DRIVE NORTH
- MINNEAPOLIS, MINNESOTA 55422
- (IN CANADA-HONEYWELL CONTROLS LIMITED 740 ELLESMERE ROAD SCARBOROUGH, ONTARIO)
- INTERNATIONAL SALES AND SERVICE OFFICES IN ALL PRINCIPAL CITIES OF THE WORLD.
LISTING BODIES
- R856A, B and D Fan Centers are listed by Underwriters’ Laboratories, Inc. under File E4436, Guide Number XAPX.
DIMENSIONS
DIMENSIONS: See Fig. 1.
REPAIR PARTS
- Relay-spst and spdt R851E1075
- Transformer-116826A
- Contactor —dpst – R850B1617
INSTALLATION
CAUTION
- Installer must be a trained, experienced serviceman.
- Disconnect power supply to prevent electrical shock and equipment damage.
- Always conduct a thorough checkout when job is complete.
LOCATION AND MOUNTING
The R856 may be mounted on any flat surface or on a standard 4 inch square junction box. Remove the cover by squeezing the sides and pulling straight outward. Knockouts for 1/2 or 3/4 inch conduit are provided in the top of the fan center case. When mounting on a junction box, run line voltage wires through the slot provided in the back of the case. A 7/8 inch diameter hole for low voltage wiring is located at the bottom of the case. Use the rubber grommet provided to secure the low voltage wires.
Use the case as a template, and punch or drill pilot mounting holes. Mount the R856 on a flat surface or the junction box with two screws provided.
WIRING
CAUTION
Disconnect power supply to prevent electrical shock and equipment damage.
All wiring must comply with local codes and ordinances. Refer to information furnished by the system or equipment manufacturer and wiring diagrams for typical hookups and internal schematics. After wiring is complete, place system into operation. Operate through one complete cycle to make sure equipment functions properly.
HONEYWELL INTERNATIONAL
HONEYWELL MINNEAPOLI, MINN. 55408 INTERNATIONAL Sales 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