R8845U Universal Switching Relay - PEX Universe
R8845U Universal Switching Relay PRODUCT DATA
FEATURES • Replaceable, socketed relays. • Replacement relay common to other Honeywell hydronic replacement controls. • Two troubleshooting LEDs. • Push-to-test button. • Replaceable transformer fuse. • Low-voltage contact ratings for Powerpile® applications. • Long-life DC relay drive control technology. • Relays can be used with external 24 Vac or 24 Vdc supply, line-voltage control, or with internal 24V transformer. • One model replaces several competitor models. • One model replaces many Honeywell models: R182A,B,C,J; R482A,B,C,J; R845A, R882A,B,C,J and RA832A. (See Table 1, Replacement Cross Reference.)
APPLICATION The R8845U Universal Switching Relay provides intermediate switching of line- and low-voltage devices from a line- or lowvoltage controller. The R8845U may be used to replace several Honeywell or competitive switching relays and is typically applied in hydronic heating systems.
Contents Application ........................................................................ Features ........................................................................... Specifications ................................................................... Ordering Information ........................................................ Installation ........................................................................ Wiring ............................................................................... Operation .......................................................................... Checkout .......................................................................... Troubleshooting ................................................................
® U.S. Registered Trademark Copyright © 2000 Honeywell Inc. • All Rights Reserved
1 1 2 2 4 4 8 8 8
68- 0215-1
R8845U UNIVERSAL SWITCHING RELAY
SPECIFICATIONS IMPORTANT The specifications given in this publication do not include normal manufacturing tolerances. Therefore, this unit may not exactly match the listed specifications. 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: R8845U Universal Switching Relay with 24V controller for switching one- or two-line voltage loads and one low-voltage load.
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 Listed: Guide no. XAPX7.
Electrical Ratings: Voltage: 120 Vac, 60 Hz. Thermostat Heat Anticipator Setting: 0.12A. Transformer Ratings: Primary: 120V, 60 Hz. Secondary: 24 Vac, 12 VA maximum, 9 VA available for external loads. Secondary protected by replaceable 1A automotive fuse. Contact Ratings: 7.4 AFL, 44.4 ALR on each set of line-voltage contacts; maximum connected load is 2000 VA. Switching Action: Two Spst, plus Powerpile® rated low-voltage Spst. If normally closed contacts are needed, use RA889A. Temperature Ratings: Ambient: -20°F to 120°F (-29°C to 49°C).
Dimensions: See Fig. 1. Cross Reference: The R8845U replaces Honeywell models R182A,B,C,J; R482A,B,C,J; R845A, R882A,B,C,J and RA832A, as well as several competitive models. See Table 1 for additional cross reference information. Thermostat Compatibility: All Honeywell electromechanical and most electronic 2- or 3-wire. Select thermostats with 0.12A heating anticipator settings to match the electrical rating of the R8845A Switching Relay. Replacement Parts: 32002190-001 Replacement Relay. Replacement Fuse: Use a 1A automotive fuse.
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. 2.
Your local Home and Building Control Sales Office (check white pages of your phone directory). 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, (1-800/565-6282). 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.
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R8845U UNIVERSAL SWITCHING RELAY
..
Table 1. R8845U Replacement Cross Reference. Connections Manufacturer
Input Line Voltage
Model
Honeywell
R8845U L1
Honeywell
R845A
Argo
L2
Power Relay 1
Low Voltage Relay
Power Relay 2
COM N.O. A
B
X1
X2
Thermostat W(T) R(T) C
Comments —
1
2
3
4
5
6
—
—
T
T
—
—
RA832A 1
2
—
3
—
4
X
X
T
T
—
Jumper L1 to COM and A in R8845U.
R182A
2
7
8
—
—
—
—
See Fig. 8 thermostat connections.
1
R8845U has lower output load rating. Check load requirements. use RA889A if normally closed contacts are required.
R182B
1
3
6
8
—
—
—
—
R182C
1
2
6
8
3
5
—
—
R182J
L1
L2
—
4
—
7
—
—
R482A
1
2
7
8
—
—
—
—
R482B
1
2
6
8
—
—
—
—
R482C
1
2
6
8
3
5
—
—
R482J
1
2
6
8
3
4
—
—
R882A
—
—
7
8
—
—
—
—
W
—
B
R8845U has lower output load rating. Check load requirements.
R882B
—
—
6
8
—
—
—
—
W
—
B
R882C
—
—
6
8
3
5
—
—
W
—
B
Use R889A if normally closed contacts are required.
R882J
—
—
6
8
3
4
—
—
1
—
2
AR821
1
2
3
4
5
6
—
—
T
T
—
AR822
L1
L2
3
4 5 N.O.
6 — N.O.
—
G(T)
R(T) C
N
3
4 N.O
6 — N.O.
—
G(T)
R(T) C
Jumper R(T) to W(T).
SR100A L1 T
WhiteRogers
829-189 1
2
3
4
—
—
—
—
B
R
W
829-832 1
2
—
4
—
3
X1
X2
T
T
—
Taco
SR501
N
3
4 5 N.O.
6 — N.O.
—
W(T) R(T) C
3
Line voltage switched inputs go to L1 and L2. See Fig. 9B. Use R889A if normally closed contacts are required. Line voltage switched inputs go to L1 and L2. See Fig. 9B.
Erie
H
5
If used to replace an R182J, install a jumper between L1, COM and A.
R8845U has lower output load rating. Check load requirements. Use R889A if normally closed contacts are required.
R8845U has lower output load ratings. Check load requirements. Use RA889A if normally closed contacts are required.
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R8845U UNIVERSAL SWITCHING RELAY
Mounting 4-7/16 (118)
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.
1-3/8 (35)
2-1/8 (54) 7/8(22) DIAMETER
NOTE: To reduce the possible transformer hum and relay noise that is sometimes amplified by mounting surfaces such as sheet metal, plasterboard, and similar materials, place rubber or felt washers between the case and the mounting surface.
KEYHOLE TYPE MOUNTING HOLE
3/16 (5) DIAMETER 3/8 (10) DIAMETER
1. 2.
5-3/8 (137)
3. 4.
Position the relay and mark the mounting holes. See Fig. 1. 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. Hang the relay on the screw, position the case, and start the bottom screw. Tighten both screws.
6-1/4 (159) 7/32 (6) DIAMETER MOUNTING HOLE
WIRING 5/16 (8) 3-11/16 (94)
WARNING
5/16 (8)
Electrical Shock or Personal Injury Hazard. Can cause severe 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).
KNOCKOUT FOR 1/2 (13) CONDUIT (3) 3-1/2 (89)
2-3/16 (56)
1-1/16 (27)
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.
1-1/4 (32) M17512
Fig. 1. R8845U dimensions in in. (mm).
INSTALLATION When Installing this Product . . . 1. 2. 3. 4. 5.
Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. Installer must be a trained, experienced service technician. After installation is complete, check out product operation as provided in these instructions. Follow local codes for installation and application.
WARNING
Electrical Shock Hazard. Can cause severe injury or death. The transformer core is not bonded. Disconnect power supply before wiring.
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4
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 outputs. Never connect load terminals to a load that uses more current than the amount listed in the electrical ratings on the relay. See Table 2 for maximum lowvoltage wiring length specifications. See the schematic and typical hookups in Fig. 2 through 9. Table 2. Low Voltage Maximum Wire Lengths. Wire Size (AWG)
Total Wire Length Feet
Wire Length of Run to Thermostat
Meters
Feet
Meters
22
120
38.0
60
18.0
20
200
61.0
100
30.5
18
300
91.5
150
45.5
16
500
152.5
250
76.0
14
800
244.0
400
122.0
R8845U UNIVERSAL SWITCHING RELAY
LOW VOLTAGE (CLASS 2) 2-WIRE THERMOSTAT
HYDRONIC HEATING CONTROL TERMINALS
CALL FOR HEAT LED
AUTOMOTIVE FUSE
T
R8845U RELAY
THERM. THERMOSTAT ZONE 1 T
C R(T)
TO ADDITIONAL R8845U RELAYS FOR OTHER ZONES
W(T)
ZC
L2
R(T)
L1
THERMOSTAT W(T) ZONE 2
A ZP
RELAY LED G
L2
L1
B B1
COM
N.O.
A
X1
B
N.O.
BURNER BURNER CONTROL B2
X2
COM
C1 CIRC.
1 L2
1 TO POWER
L1 HOT
1 TO LOAD 1 POWER
LOW-VOLTAGE POWERPILE®
CIRCULATOR ZONE 1
CIRCULATOR ZONE 2
C2
1
LINE
1
L1 HOT
1
LOAD 2
POWER SUPPLY. PROVIDE OVERLOAD PROTECTION AND DISCONNECT MEANS AS REQUIRED.
2
L2
2 3
M14294
Fig. 2. R8845U Internal schematic and typical hookup.
1 POWER SUPPLY. PROVIDE OVERLOAD PROTECTION AND DISCONNECT MEANS AS REQUIRED. 2 IF CONTROLLING TWO LOADS, USE: N.O. AND COM FOR LINE VOLTAGE LOAD, A AND B FOR LINE OR LOW VOLTAGE LOAD. 3 IF USING LOW VOLTAGE, USE A SEPARATE TRANSFORMER.
M14296
Fig. 3. R8845U schematic diagram for multizone, hydronic heating system (applies for any number of additional zones).
T87F T87F
L7124A, L8124A R(T)
ZR
R(T)
W(T)
L1 C1 C2 B2 B1
L1
L2 COM
3
2 G
L2
T87F R8845U RELAY
R8845U RELAY
ZC
W(T)
A
B
N.O.
R(T)
W(T)
L1
L2 COM
A
B
N.O.
L2 L1 (HOT) 1
PUMP
PUMP
PUMP
R8184 T
F
T
F
BLACK
WHITE
C554
ORANGE
BURNER AND IGNITION
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.
3
B1 IS 1/4 IN. TAB TERMINAL.
M14298
Fig. 4. R8845U hookup for L7124A/L8124A in an oil-fired, tankless hot water, zoned, pump system.
5
68-0215—1
R8845U UNIVERSAL SWITCHING RELAY
T87F
T87F
T87F R8845U
R8845U RELAY
R(T)
W(T)
L1
L1 (HOT)
1
R(T)
COM
L2
N.O.
X1
X2
L1
PUMP
R8845U
W(T)
R(T)
COM
L2
N.O.
X1
X2
L1
W(T)
COM
L2
PUMP
N.O.
X1
X2
PUMP
L2
ORANGE G
2
F
L2
L1
T
T
C1
C2
B2
B1
3
WHITE
C554
F BLACK
BURNER AND IGNITION
T L7148A/L8148A T R8184G
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED. M14300
3 B1 IS 1/4 IN. TAB TERMINAL.
Fig. 5. R8845U hookup for L7148A/L8148A in an oil-fired, tankless hot water, zoned, pump system.
T87F
T87F
T87F
R8845U RELAY R(T)
L1 (HOT)
1
R(T)
W(T)
L2
L1
R8845U
COM
N.O.
X1
X2
L1
PUMP
W(T)
L2
R8845U R(T)
COM
N.O.
PUMP
X1
X2
W(T)
L2
L1
COM
N.O.
X1
X2
PUMP
L2
2
G
L2
L1
T
T
TR 3
C1
C2
B2
B1
THTR TH
LOW VOLTAGE GAS VALVE (eg, VR8300)
L7148F/L8148E
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.
3
B1 IS 1/4 IN. TAB TERMINAL.
Fig. 6. R8845U hookup for L7148F/L8148E in a gas-fired, 24V, zoned, pump system.
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6
M13318
R8845U UNIVERSAL SWITCHING RELAY
R8888 1
L1 (HOT) L2 3
R
G L2 L1 L2 L1 L1 ZC
C A B C
20 VA
R8845U L2
4 N.O.
H1 H2
ZONE 1 THERMOSTAT
CIRCULATOR PUMP 1
W
C2 C1
R
ZONE 1
CIRCULATOR PUMP 5
L1
ZC
A
H1
B
H2
COM
ZONE 5 THERMOSTAT
TO APPROPRIATE CONNECTIONS AS REQUIRED BY THE SYSTEM. H1-H2 TYPICALLY CONNECTED TO T-T OF BURNER CONTROL SYSTEM.
R(T)
ZONE 2 THERMOSTAT
W
C2 C1
R
ZONE 2
CIRCULATOR PUMP 2
G
ZONE 3 THERMOSTAT
CIRCULATOR PUMP 3
W
C2 C1
R
ZONE 3
1
ZONE 4 THERMOSTAT
CIRCULATOR PUMP 4
W
C2 C1
R
ZONE 4
W(T)
2
1
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
USE COPPER CONDUCTORS ONLY. FOR ALL CLASS 1 CONNECTIONS, USE WIRE RATED FOR AT LEAST 167°F (75°C).
4
CONNECT L1-ZC JUMPER, IF REQUIRED.
M13315
Fig. 7. R8888 zone expansion using additional R8845U Universal Switching Relays.
THREE-WIRE LOW VOLTAGE (SERIES 10) 1 THERMOSTAT W(T)
R(T)
R(T)
C
W(T)
TWO-WIRE LOW VOLTAGE (SERIES 80) THERMOSTAT
B
X1
R8845U
X2
R(T)
C
W(T)
X1
X2
R8845U
1 MAKES CONTACT ONLY ON TEMPERATURE FALL.
M13319
Fig. 8. R8845U thermostat connections.
7
68-0215—1
A.
OPERATION
FOR 24V THERMOSTAT CONTROL L1, (HOT) NEUTRAL
R(T)
R
L2
W(T)
W
C
COM
LINE VOLTAGE CONTROLLED OUTPUTS
THERMOSTAT
R8845U L1
C OPTIONAL 2
N.O.
B.
The R8845U consists of a transformer, two Spst line voltage relays, a 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.
A
X1
B
X2
LOW VOLTAGE POWERPILE® CONTROLLED OUTPUT
CHECKOUT
FOR LINE VOLTAGE CONTROL
LINE VOLTAGE CONTROL 3 NEUTRAL
1.
R8845U L1
R(T)
L2
W(T)
JUMPER
2.
C
COM N.O.
A
X1
B
X2
3.
C. FOR EXTERNAL SEPARATE LOW VOLTAGE POWER SOURCE
TROUBLESHOOTING
R8845U NEUTRAL
L1
R(T)
L2
W(T)
1 COM
C
Test Button
24V CONTROLLER INPUT SUPPLY
This connection is the same as a call for heat connection between the R(T) and W(T) terminals.
N.O.
A
X1
B
X2
Keep the cover on the relay during normal operation and remove only for service and checkout. 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 operation. After installation is complete, operate system through at least one cycle from the controller to make certain the relay controls the equipment as intended.
Heat Call LED
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. M13320
• The LED should light if there is a call for heat or if the test button is pressed. • If the LED remains off during a call for heat and turns on when the Test Button is pressed, the thermostat is not operating correctly. • If the LED remains off on a call for heat and also remains off when the Test Button is pressed, the R8845U is not operating correctly. Check the fuse; if the fuse is intact, replace the control.
Fig. 9. R8845U control options.
Relay LED This LED lights whenever there is 120 Vac (L1) on the N.O. terminal (when COM/N.O. relay contacts are closed).
Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneapolis, MN 55408-0524
Home and Building Control Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 3N7
Honeywell Latin American Region 480 Sawgrass Corporate Parkway Suite 200 Sunrise FL 33325
Honeywell Europe S.A. 3 Avenue du Bourget 1140 Brussels Belgium
68-0215—1
G.R. Rev. 5-00
Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers.
Honeywell Asia Pacific Inc. Room 3213-3225 Sun Hung Kai Centre No. 30 Harbour Road Wanchai Hong Kong
www.honeywell.com
FEATURES • Replaceable, socketed relays. • Replacement relay common to other Honeywell hydronic replacement controls. • Two troubleshooting LEDs. • Push-to-test button. • Replaceable transformer fuse. • Low-voltage contact ratings for Powerpile® applications. • Long-life DC relay drive control technology. • Relays can be used with external 24 Vac or 24 Vdc supply, line-voltage control, or with internal 24V transformer. • One model replaces several competitor models. • One model replaces many Honeywell models: R182A,B,C,J; R482A,B,C,J; R845A, R882A,B,C,J and RA832A. (See Table 1, Replacement Cross Reference.)
APPLICATION The R8845U Universal Switching Relay provides intermediate switching of line- and low-voltage devices from a line- or lowvoltage controller. The R8845U may be used to replace several Honeywell or competitive switching relays and is typically applied in hydronic heating systems.
Contents Application ........................................................................ Features ........................................................................... Specifications ................................................................... Ordering Information ........................................................ Installation ........................................................................ Wiring ............................................................................... Operation .......................................................................... Checkout .......................................................................... Troubleshooting ................................................................
® U.S. Registered Trademark Copyright © 2000 Honeywell Inc. • All Rights Reserved
1 1 2 2 4 4 8 8 8
68- 0215-1
R8845U UNIVERSAL SWITCHING RELAY
SPECIFICATIONS IMPORTANT The specifications given in this publication do not include normal manufacturing tolerances. Therefore, this unit may not exactly match the listed specifications. 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: R8845U Universal Switching Relay with 24V controller for switching one- or two-line voltage loads and one low-voltage load.
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 Listed: Guide no. XAPX7.
Electrical Ratings: Voltage: 120 Vac, 60 Hz. Thermostat Heat Anticipator Setting: 0.12A. Transformer Ratings: Primary: 120V, 60 Hz. Secondary: 24 Vac, 12 VA maximum, 9 VA available for external loads. Secondary protected by replaceable 1A automotive fuse. Contact Ratings: 7.4 AFL, 44.4 ALR on each set of line-voltage contacts; maximum connected load is 2000 VA. Switching Action: Two Spst, plus Powerpile® rated low-voltage Spst. If normally closed contacts are needed, use RA889A. Temperature Ratings: Ambient: -20°F to 120°F (-29°C to 49°C).
Dimensions: See Fig. 1. Cross Reference: The R8845U replaces Honeywell models R182A,B,C,J; R482A,B,C,J; R845A, R882A,B,C,J and RA832A, as well as several competitive models. See Table 1 for additional cross reference information. Thermostat Compatibility: All Honeywell electromechanical and most electronic 2- or 3-wire. Select thermostats with 0.12A heating anticipator settings to match the electrical rating of the R8845A Switching Relay. Replacement Parts: 32002190-001 Replacement Relay. Replacement Fuse: Use a 1A automotive fuse.
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. 2.
Your local Home and Building Control Sales Office (check white pages of your phone directory). 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, (1-800/565-6282). 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.
68-0215—1
2
R8845U UNIVERSAL SWITCHING RELAY
..
Table 1. R8845U Replacement Cross Reference. Connections Manufacturer
Input Line Voltage
Model
Honeywell
R8845U L1
Honeywell
R845A
Argo
L2
Power Relay 1
Low Voltage Relay
Power Relay 2
COM N.O. A
B
X1
X2
Thermostat W(T) R(T) C
Comments —
1
2
3
4
5
6
—
—
T
T
—
—
RA832A 1
2
—
3
—
4
X
X
T
T
—
Jumper L1 to COM and A in R8845U.
R182A
2
7
8
—
—
—
—
See Fig. 8 thermostat connections.
1
R8845U has lower output load rating. Check load requirements. use RA889A if normally closed contacts are required.
R182B
1
3
6
8
—
—
—
—
R182C
1
2
6
8
3
5
—
—
R182J
L1
L2
—
4
—
7
—
—
R482A
1
2
7
8
—
—
—
—
R482B
1
2
6
8
—
—
—
—
R482C
1
2
6
8
3
5
—
—
R482J
1
2
6
8
3
4
—
—
R882A
—
—
7
8
—
—
—
—
W
—
B
R8845U has lower output load rating. Check load requirements.
R882B
—
—
6
8
—
—
—
—
W
—
B
R882C
—
—
6
8
3
5
—
—
W
—
B
Use R889A if normally closed contacts are required.
R882J
—
—
6
8
3
4
—
—
1
—
2
AR821
1
2
3
4
5
6
—
—
T
T
—
AR822
L1
L2
3
4 5 N.O.
6 — N.O.
—
G(T)
R(T) C
N
3
4 N.O
6 — N.O.
—
G(T)
R(T) C
Jumper R(T) to W(T).
SR100A L1 T
WhiteRogers
829-189 1
2
3
4
—
—
—
—
B
R
W
829-832 1
2
—
4
—
3
X1
X2
T
T
—
Taco
SR501
N
3
4 5 N.O.
6 — N.O.
—
W(T) R(T) C
3
Line voltage switched inputs go to L1 and L2. See Fig. 9B. Use R889A if normally closed contacts are required. Line voltage switched inputs go to L1 and L2. See Fig. 9B.
Erie
H
5
If used to replace an R182J, install a jumper between L1, COM and A.
R8845U has lower output load rating. Check load requirements. Use R889A if normally closed contacts are required.
R8845U has lower output load ratings. Check load requirements. Use RA889A if normally closed contacts are required.
68-0215—1
R8845U UNIVERSAL SWITCHING RELAY
Mounting 4-7/16 (118)
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.
1-3/8 (35)
2-1/8 (54) 7/8(22) DIAMETER
NOTE: To reduce the possible transformer hum and relay noise that is sometimes amplified by mounting surfaces such as sheet metal, plasterboard, and similar materials, place rubber or felt washers between the case and the mounting surface.
KEYHOLE TYPE MOUNTING HOLE
3/16 (5) DIAMETER 3/8 (10) DIAMETER
1. 2.
5-3/8 (137)
3. 4.
Position the relay and mark the mounting holes. See Fig. 1. 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. Hang the relay on the screw, position the case, and start the bottom screw. Tighten both screws.
6-1/4 (159) 7/32 (6) DIAMETER MOUNTING HOLE
WIRING 5/16 (8) 3-11/16 (94)
WARNING
5/16 (8)
Electrical Shock or Personal Injury Hazard. Can cause severe 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).
KNOCKOUT FOR 1/2 (13) CONDUIT (3) 3-1/2 (89)
2-3/16 (56)
1-1/16 (27)
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.
1-1/4 (32) M17512
Fig. 1. R8845U dimensions in in. (mm).
INSTALLATION When Installing this Product . . . 1. 2. 3. 4. 5.
Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. Installer must be a trained, experienced service technician. After installation is complete, check out product operation as provided in these instructions. Follow local codes for installation and application.
WARNING
Electrical Shock Hazard. Can cause severe injury or death. The transformer core is not bonded. Disconnect power supply before wiring.
68-0215—1
4
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 outputs. Never connect load terminals to a load that uses more current than the amount listed in the electrical ratings on the relay. See Table 2 for maximum lowvoltage wiring length specifications. See the schematic and typical hookups in Fig. 2 through 9. Table 2. Low Voltage Maximum Wire Lengths. Wire Size (AWG)
Total Wire Length Feet
Wire Length of Run to Thermostat
Meters
Feet
Meters
22
120
38.0
60
18.0
20
200
61.0
100
30.5
18
300
91.5
150
45.5
16
500
152.5
250
76.0
14
800
244.0
400
122.0
R8845U UNIVERSAL SWITCHING RELAY
LOW VOLTAGE (CLASS 2) 2-WIRE THERMOSTAT
HYDRONIC HEATING CONTROL TERMINALS
CALL FOR HEAT LED
AUTOMOTIVE FUSE
T
R8845U RELAY
THERM. THERMOSTAT ZONE 1 T
C R(T)
TO ADDITIONAL R8845U RELAYS FOR OTHER ZONES
W(T)
ZC
L2
R(T)
L1
THERMOSTAT W(T) ZONE 2
A ZP
RELAY LED G
L2
L1
B B1
COM
N.O.
A
X1
B
N.O.
BURNER BURNER CONTROL B2
X2
COM
C1 CIRC.
1 L2
1 TO POWER
L1 HOT
1 TO LOAD 1 POWER
LOW-VOLTAGE POWERPILE®
CIRCULATOR ZONE 1
CIRCULATOR ZONE 2
C2
1
LINE
1
L1 HOT
1
LOAD 2
POWER SUPPLY. PROVIDE OVERLOAD PROTECTION AND DISCONNECT MEANS AS REQUIRED.
2
L2
2 3
M14294
Fig. 2. R8845U Internal schematic and typical hookup.
1 POWER SUPPLY. PROVIDE OVERLOAD PROTECTION AND DISCONNECT MEANS AS REQUIRED. 2 IF CONTROLLING TWO LOADS, USE: N.O. AND COM FOR LINE VOLTAGE LOAD, A AND B FOR LINE OR LOW VOLTAGE LOAD. 3 IF USING LOW VOLTAGE, USE A SEPARATE TRANSFORMER.
M14296
Fig. 3. R8845U schematic diagram for multizone, hydronic heating system (applies for any number of additional zones).
T87F T87F
L7124A, L8124A R(T)
ZR
R(T)
W(T)
L1 C1 C2 B2 B1
L1
L2 COM
3
2 G
L2
T87F R8845U RELAY
R8845U RELAY
ZC
W(T)
A
B
N.O.
R(T)
W(T)
L1
L2 COM
A
B
N.O.
L2 L1 (HOT) 1
PUMP
PUMP
PUMP
R8184 T
F
T
F
BLACK
WHITE
C554
ORANGE
BURNER AND IGNITION
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.
3
B1 IS 1/4 IN. TAB TERMINAL.
M14298
Fig. 4. R8845U hookup for L7124A/L8124A in an oil-fired, tankless hot water, zoned, pump system.
5
68-0215—1
R8845U UNIVERSAL SWITCHING RELAY
T87F
T87F
T87F R8845U
R8845U RELAY
R(T)
W(T)
L1
L1 (HOT)
1
R(T)
COM
L2
N.O.
X1
X2
L1
PUMP
R8845U
W(T)
R(T)
COM
L2
N.O.
X1
X2
L1
W(T)
COM
L2
PUMP
N.O.
X1
X2
PUMP
L2
ORANGE G
2
F
L2
L1
T
T
C1
C2
B2
B1
3
WHITE
C554
F BLACK
BURNER AND IGNITION
T L7148A/L8148A T R8184G
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED. M14300
3 B1 IS 1/4 IN. TAB TERMINAL.
Fig. 5. R8845U hookup for L7148A/L8148A in an oil-fired, tankless hot water, zoned, pump system.
T87F
T87F
T87F
R8845U RELAY R(T)
L1 (HOT)
1
R(T)
W(T)
L2
L1
R8845U
COM
N.O.
X1
X2
L1
PUMP
W(T)
L2
R8845U R(T)
COM
N.O.
PUMP
X1
X2
W(T)
L2
L1
COM
N.O.
X1
X2
PUMP
L2
2
G
L2
L1
T
T
TR 3
C1
C2
B2
B1
THTR TH
LOW VOLTAGE GAS VALVE (eg, VR8300)
L7148F/L8148E
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.
3
B1 IS 1/4 IN. TAB TERMINAL.
Fig. 6. R8845U hookup for L7148F/L8148E in a gas-fired, 24V, zoned, pump system.
68-0215—1
6
M13318
R8845U UNIVERSAL SWITCHING RELAY
R8888 1
L1 (HOT) L2 3
R
G L2 L1 L2 L1 L1 ZC
C A B C
20 VA
R8845U L2
4 N.O.
H1 H2
ZONE 1 THERMOSTAT
CIRCULATOR PUMP 1
W
C2 C1
R
ZONE 1
CIRCULATOR PUMP 5
L1
ZC
A
H1
B
H2
COM
ZONE 5 THERMOSTAT
TO APPROPRIATE CONNECTIONS AS REQUIRED BY THE SYSTEM. H1-H2 TYPICALLY CONNECTED TO T-T OF BURNER CONTROL SYSTEM.
R(T)
ZONE 2 THERMOSTAT
W
C2 C1
R
ZONE 2
CIRCULATOR PUMP 2
G
ZONE 3 THERMOSTAT
CIRCULATOR PUMP 3
W
C2 C1
R
ZONE 3
1
ZONE 4 THERMOSTAT
CIRCULATOR PUMP 4
W
C2 C1
R
ZONE 4
W(T)
2
1
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
USE COPPER CONDUCTORS ONLY. FOR ALL CLASS 1 CONNECTIONS, USE WIRE RATED FOR AT LEAST 167°F (75°C).
4
CONNECT L1-ZC JUMPER, IF REQUIRED.
M13315
Fig. 7. R8888 zone expansion using additional R8845U Universal Switching Relays.
THREE-WIRE LOW VOLTAGE (SERIES 10) 1 THERMOSTAT W(T)
R(T)
R(T)
C
W(T)
TWO-WIRE LOW VOLTAGE (SERIES 80) THERMOSTAT
B
X1
R8845U
X2
R(T)
C
W(T)
X1
X2
R8845U
1 MAKES CONTACT ONLY ON TEMPERATURE FALL.
M13319
Fig. 8. R8845U thermostat connections.
7
68-0215—1
A.
OPERATION
FOR 24V THERMOSTAT CONTROL L1, (HOT) NEUTRAL
R(T)
R
L2
W(T)
W
C
COM
LINE VOLTAGE CONTROLLED OUTPUTS
THERMOSTAT
R8845U L1
C OPTIONAL 2
N.O.
B.
The R8845U consists of a transformer, two Spst line voltage relays, a 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.
A
X1
B
X2
LOW VOLTAGE POWERPILE® CONTROLLED OUTPUT
CHECKOUT
FOR LINE VOLTAGE CONTROL
LINE VOLTAGE CONTROL 3 NEUTRAL
1.
R8845U L1
R(T)
L2
W(T)
JUMPER
2.
C
COM N.O.
A
X1
B
X2
3.
C. FOR EXTERNAL SEPARATE LOW VOLTAGE POWER SOURCE
TROUBLESHOOTING
R8845U NEUTRAL
L1
R(T)
L2
W(T)
1 COM
C
Test Button
24V CONTROLLER INPUT SUPPLY
This connection is the same as a call for heat connection between the R(T) and W(T) terminals.
N.O.
A
X1
B
X2
Keep the cover on the relay during normal operation and remove only for service and checkout. 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 operation. After installation is complete, operate system through at least one cycle from the controller to make certain the relay controls the equipment as intended.
Heat Call LED
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. M13320
• The LED should light if there is a call for heat or if the test button is pressed. • If the LED remains off during a call for heat and turns on when the Test Button is pressed, the thermostat is not operating correctly. • If the LED remains off on a call for heat and also remains off when the Test Button is pressed, the R8845U is not operating correctly. Check the fuse; if the fuse is intact, replace the control.
Fig. 9. R8845U control options.
Relay LED This LED lights whenever there is 120 Vac (L1) on the N.O. terminal (when COM/N.O. relay contacts are closed).
Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneapolis, MN 55408-0524
Home and Building Control Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 3N7
Honeywell Latin American Region 480 Sawgrass Corporate Parkway Suite 200 Sunrise FL 33325
Honeywell Europe S.A. 3 Avenue du Bourget 1140 Brussels Belgium
68-0215—1
G.R. Rev. 5-00
Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers.
Honeywell Asia Pacific Inc. Room 3213-3225 Sun Hung Kai Centre No. 30 Harbour Road Wanchai Hong Kong
www.honeywell.com
