R8845U Universal Switching Relay - ALBRO HVAC SUPPLY
R8845U Universal Switching Relay INSTALLATION INSTRUCTIONS
APPLICATION
Contact Ratings: 7.4 AFL, 44.4 ALR on each set of line voltage contacts; maximum connected load is 2000 VA.
The R8845U Universal Switching Relay provides intermediate switching of line- and low-voltage devices from a line- or low-voltage controller. The R8845U may be used to replace several Honeywell or competitive switching relays and is typically applied in hydronic heating systems.
Switching Action: 2 Spst, plus Powerpile® rated low-voltage Spst. If normally closed contacts are needed, use RA889A Switching Relay. Electrical Connections: No. 8 captivated wire clamp screw terminals.
SPECIFICATIONS
Dimensions: See Fig. 1.
Electrical Ratings: Voltage: 120 Vac, 60 Hz. Thermostat Heat Anticipator Setting: 0.12A.
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.
Transformer Ratings: Primary: 120V, 60 Hz. Secondary: 24 Vac, 12 VA maximum; 9 VA available for external loads. Output protected by replaceable 1A automotive fuse.
Replacement Parts: 32002190-001 Replacement Relay. Replacement Fuse: Use a 1A automotive fuse.
Table 1. R8845U Replacement Cross Reference. Connections Manufacturer
Model
Input Line Power Relay Voltage 1
Honeywell R8845U
L1
L2
Honeywell R845A
1
Honeywell RA832A
1
Honeywell R182A
Power Relay 2
Low Voltage Relay
A
B
X1
X2
W(T)
R(T)
C
— —
Thermostat
Comments
COM
N.O.
2
3
4
5
6
—
—
T
T
—
2
—
3
—
4
X
X
T
T
— Jumper L1 to COM and A in R8845U.
1
2
7
8
—
—
—
—
Honeywell R182B
1
3
6
8
—
—
—
—
Honeywell R182C
1
2
6
8
3
5
—
—
Honeywell R182J
L1
L2
—
4
—
7
—
—
Honeywell R482A
1
2
7
8
—
—
—
—
See Fig. 8 thermostat connections.
R8845U has lower output load rating. Check load requirements. Use RA889A if normally closed contacts are required.
If used to replace an R182J, install a jumper between L1, COM and A. Jumper R(T) to W(T).
Line voltage switched inputs go to L1 and L2. See Fig. 9B.
(continued)
®U.S. Registered Trademark Copyright © 1999 Honeywell Inc. • All Rights Reserved
X-XX UL
69-1292
R8845U UNIVERSAL SWITCHING RELAY
Table 1. R8845U Replacement Cross Reference (Continued). Connections Manufacturer
Model
Input Line Power Relay Voltage 1
Power Relay 2
Low Voltage Relay
Thermostat
Comments
Honeywell R482B
1
2
6
8
—
—
—
—
Jumper R(T) to W(T) (continued).
Honeywell R482C
1
2
6
8
3
5
—
—
Honeywell R482J
1
2
6
8
3
4
—
—
Honeywell R882A
—
—
7
8
—
—
—
—
W
—
B
R8845U has lower output load rating. Check load requirements.
Honeywell R882B
—
—
6
8
—
—
—
—
W
—
B B
Use RA889A if normally closed contacts are required.
Use RA889A if normally closed contacts are required. Line voltage switched inputs go to L1 and L2. See Fig. 9B.
Honeywell R882C
—
—
6
8
3
5
—
—
W
—
Honeywell R882J
—
—
6
8
3
4
—
—
1
—
2
Argo
AR821
1
2
3
4
5
6
—
—
T
T
—
R8845U has lower output load rating. Check load requirements.
Argo
AR822
L1
L2
3
4 N.O.
5
6 N.O.
—
—
G(T)
R(T)
C
Erie
SR100AT
L1
N
3
4 N.O.
5
6 N.O.
—
—
G(T)
R(T)
C
Use RA889A if normally closed contacts are required.
WhiteRodgers
829-189
1
2
3
4
—
—
—
—
B
R
W
WhiteRodgers
829-832
1
2
—
4
—
3
X1
X2
T
T
—
Taco
SR501
H
N
3
4 N.O.
5
6 N.O.
—
—
W(T)
R(T)
C
69-1292
2
R8845U has lower output load rating. Check load requirements. Use RA889A if normally closed contacts are required.
R8845U UNIVERSAL SWITCHING RELAY
4 5 1 (29) 32
1 (108) 4
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.
7 8 (48)
1
7 (22) DIAMETER 8
3 (2) DIAMETER 32 1 (13) DIAMETER 2
NOTE: To reduce the possible transformer hum and relay noise that is sometimes amplified by mounting surfaces such as sheetmetal, plasterboard, and similar materials, place rubber or felt washers between the case and the mounting surface.
KEYHOLE TYPE MOUNTING HOLE
1 2 (114)
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.
4
1 4 (133) 5
WIRING
3 (10) 8 3 (10) 8
1 3 (89) 2 7 (6) DIAMETER MOUNTING HOLE 32
CAUTION
Electrical Shock or Personal Injury Hazard. Power supply can shock. 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).
15 2 16 (75) 7 8 (48)
1
25 (20) 32
1
3 (35) 8
KNOCKOUT FOR 1/2 (13) CONDUIT (3)
All wiring must comply with all applicable electrical codes, ordinances, and regulations. Follow all instructions furnished with the controlled equipment.
M3823A
Fig. 1. R8845U dimensions in in. (mm).
IMPORTANT
The switching relay terminals are approved only for use with copper wires.
INSTALLATION
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 low-voltage wiring length specifications. See the schematic and typical hookups in Fig. 2 through 9.
When Installing this Product . . . 1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. 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 technician. 4. After installation is complete, check out product operation as provided in these instructions. 5. Follow local codes for installation and application.
Table 2. Low-Voltage Maximum Wire Lengths.
WARNING
Electrocution Hazard. Power supply can cause severe injury, or death. Transformer core not bonded. Disconnect power supply before wiring.
3
Total Wire Length
Wire Length of Run to Thermostat
Wire Size (AWG)
Ft
M
Ft
M
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
69-1292
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
COM
N.O.
A
X1
B
B1 BURNER BURNER CONTROL B2
X2
N.O. COM
C1 1 L2
1 TO POWER
L1 HOT
1 TO LOAD 1 POWER
CIRC.
LOW-VOLTAGE POWERPILE®
CIRCULATOR ZONE 1
CIRCULATOR ZONE 2
C2
LOAD 2
1 1
POWER SUPPLY. PROVIDE OVERLOAD PROTECTION AND DISCONNECT MEANS AS REQUIRED.
1
LINE M14294
2
L1 HOT
2 3
L2
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.
69-1292
4
R8845U UNIVERSAL SWITCHING RELAY
T87F
T87F
T87F R8845U
R8845U RELAY
R(T)
L1
L1 (HOT)
1
W(T)
R(T)
COM
L2
N.O.
X1
X2
L1
R(T)
COM
L2
PUMP
R8845U
W(T)
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
COM
R8845U
N.O.
X1
X2
PUMP
W(T)
L2
L1
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.
M13318
Fig. 6. R8845U hookup for L7148F/L8148E in a gas-fired, 24V, zoned, pump system.
5
69-1292
R8845U UNIVERSAL SWITCHING RELAY
L1 (HOT) L2 3
R8888 1
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
TO APPROPRIATE CONNECTIONS AS REQUIRED BY THE SYSTEM. H1-H2 TYPICALLY CONNECTED TO T-T OF BURNER CONTROL SYSTEM.
COM
ZONE 5 THERMOSTAT R(T)
ZONE 2 THERMOSTAT
CIRCULATOR PUMP 2
W
C2 C1
R
ZONE 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
R8845U
1 MAKES CONTACT ONLY ON TEMPERATURE FALL.
Fig. 8. R8845U thermostat connections.
69-1292
6
X2
M13319
R8845U UNIVERSAL SWITCHING RELAY
A.
CHECKOUT
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.
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 selfcleaning. The contacts may turn black after being in service for some time; this discoloration does not prevent proper operation. 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.
A
X1
B
X2
LOW VOLTAGE POWERPILE® CONTROLLED OUTPUT
FOR LINE VOLTAGE CONTROL
LINE VOLTAGE CONTROL 3 NEUTRAL
R8845U L1
R(T)
L2
W(T)
TROUBLESHOOTING
JUMPER
C
COM
Test Button — 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
Heat Call LED — 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.
C. FOR EXTERNAL SEPARATE LOW VOLTAGE POWER SOURCE R8845U NEUTRAL
L1
R(T)
L2
W(T)
1 COM
C
24V CONTROLLER INPUT SUPPLY
N.O.
A
X1
B
X2
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
Relay LED — This LED lights whenever there is 120 Vac (L1) on the N.O. terminal (when COM/N.O. relay contacts are closed).
Fig. 9. R8845U control options.
7
69-1292
R8845U UNIVERSAL SWITCHING RELAY
Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422
69-1292 J.S. 3-99
Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9
8
www.honeywell.com
APPLICATION
Contact Ratings: 7.4 AFL, 44.4 ALR on each set of line voltage contacts; maximum connected load is 2000 VA.
The R8845U Universal Switching Relay provides intermediate switching of line- and low-voltage devices from a line- or low-voltage controller. The R8845U may be used to replace several Honeywell or competitive switching relays and is typically applied in hydronic heating systems.
Switching Action: 2 Spst, plus Powerpile® rated low-voltage Spst. If normally closed contacts are needed, use RA889A Switching Relay. Electrical Connections: No. 8 captivated wire clamp screw terminals.
SPECIFICATIONS
Dimensions: See Fig. 1.
Electrical Ratings: Voltage: 120 Vac, 60 Hz. Thermostat Heat Anticipator Setting: 0.12A.
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.
Transformer Ratings: Primary: 120V, 60 Hz. Secondary: 24 Vac, 12 VA maximum; 9 VA available for external loads. Output protected by replaceable 1A automotive fuse.
Replacement Parts: 32002190-001 Replacement Relay. Replacement Fuse: Use a 1A automotive fuse.
Table 1. R8845U Replacement Cross Reference. Connections Manufacturer
Model
Input Line Power Relay Voltage 1
Honeywell R8845U
L1
L2
Honeywell R845A
1
Honeywell RA832A
1
Honeywell R182A
Power Relay 2
Low Voltage Relay
A
B
X1
X2
W(T)
R(T)
C
— —
Thermostat
Comments
COM
N.O.
2
3
4
5
6
—
—
T
T
—
2
—
3
—
4
X
X
T
T
— Jumper L1 to COM and A in R8845U.
1
2
7
8
—
—
—
—
Honeywell R182B
1
3
6
8
—
—
—
—
Honeywell R182C
1
2
6
8
3
5
—
—
Honeywell R182J
L1
L2
—
4
—
7
—
—
Honeywell R482A
1
2
7
8
—
—
—
—
See Fig. 8 thermostat connections.
R8845U has lower output load rating. Check load requirements. Use RA889A if normally closed contacts are required.
If used to replace an R182J, install a jumper between L1, COM and A. Jumper R(T) to W(T).
Line voltage switched inputs go to L1 and L2. See Fig. 9B.
(continued)
®U.S. Registered Trademark Copyright © 1999 Honeywell Inc. • All Rights Reserved
X-XX UL
69-1292
R8845U UNIVERSAL SWITCHING RELAY
Table 1. R8845U Replacement Cross Reference (Continued). Connections Manufacturer
Model
Input Line Power Relay Voltage 1
Power Relay 2
Low Voltage Relay
Thermostat
Comments
Honeywell R482B
1
2
6
8
—
—
—
—
Jumper R(T) to W(T) (continued).
Honeywell R482C
1
2
6
8
3
5
—
—
Honeywell R482J
1
2
6
8
3
4
—
—
Honeywell R882A
—
—
7
8
—
—
—
—
W
—
B
R8845U has lower output load rating. Check load requirements.
Honeywell R882B
—
—
6
8
—
—
—
—
W
—
B B
Use RA889A if normally closed contacts are required.
Use RA889A if normally closed contacts are required. Line voltage switched inputs go to L1 and L2. See Fig. 9B.
Honeywell R882C
—
—
6
8
3
5
—
—
W
—
Honeywell R882J
—
—
6
8
3
4
—
—
1
—
2
Argo
AR821
1
2
3
4
5
6
—
—
T
T
—
R8845U has lower output load rating. Check load requirements.
Argo
AR822
L1
L2
3
4 N.O.
5
6 N.O.
—
—
G(T)
R(T)
C
Erie
SR100AT
L1
N
3
4 N.O.
5
6 N.O.
—
—
G(T)
R(T)
C
Use RA889A if normally closed contacts are required.
WhiteRodgers
829-189
1
2
3
4
—
—
—
—
B
R
W
WhiteRodgers
829-832
1
2
—
4
—
3
X1
X2
T
T
—
Taco
SR501
H
N
3
4 N.O.
5
6 N.O.
—
—
W(T)
R(T)
C
69-1292
2
R8845U has lower output load rating. Check load requirements. Use RA889A if normally closed contacts are required.
R8845U UNIVERSAL SWITCHING RELAY
4 5 1 (29) 32
1 (108) 4
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.
7 8 (48)
1
7 (22) DIAMETER 8
3 (2) DIAMETER 32 1 (13) DIAMETER 2
NOTE: To reduce the possible transformer hum and relay noise that is sometimes amplified by mounting surfaces such as sheetmetal, plasterboard, and similar materials, place rubber or felt washers between the case and the mounting surface.
KEYHOLE TYPE MOUNTING HOLE
1 2 (114)
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.
4
1 4 (133) 5
WIRING
3 (10) 8 3 (10) 8
1 3 (89) 2 7 (6) DIAMETER MOUNTING HOLE 32
CAUTION
Electrical Shock or Personal Injury Hazard. Power supply can shock. 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).
15 2 16 (75) 7 8 (48)
1
25 (20) 32
1
3 (35) 8
KNOCKOUT FOR 1/2 (13) CONDUIT (3)
All wiring must comply with all applicable electrical codes, ordinances, and regulations. Follow all instructions furnished with the controlled equipment.
M3823A
Fig. 1. R8845U dimensions in in. (mm).
IMPORTANT
The switching relay terminals are approved only for use with copper wires.
INSTALLATION
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 low-voltage wiring length specifications. See the schematic and typical hookups in Fig. 2 through 9.
When Installing this Product . . . 1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. 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 technician. 4. After installation is complete, check out product operation as provided in these instructions. 5. Follow local codes for installation and application.
Table 2. Low-Voltage Maximum Wire Lengths.
WARNING
Electrocution Hazard. Power supply can cause severe injury, or death. Transformer core not bonded. Disconnect power supply before wiring.
3
Total Wire Length
Wire Length of Run to Thermostat
Wire Size (AWG)
Ft
M
Ft
M
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
69-1292
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
COM
N.O.
A
X1
B
B1 BURNER BURNER CONTROL B2
X2
N.O. COM
C1 1 L2
1 TO POWER
L1 HOT
1 TO LOAD 1 POWER
CIRC.
LOW-VOLTAGE POWERPILE®
CIRCULATOR ZONE 1
CIRCULATOR ZONE 2
C2
LOAD 2
1 1
POWER SUPPLY. PROVIDE OVERLOAD PROTECTION AND DISCONNECT MEANS AS REQUIRED.
1
LINE M14294
2
L1 HOT
2 3
L2
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.
69-1292
4
R8845U UNIVERSAL SWITCHING RELAY
T87F
T87F
T87F R8845U
R8845U RELAY
R(T)
L1
L1 (HOT)
1
W(T)
R(T)
COM
L2
N.O.
X1
X2
L1
R(T)
COM
L2
PUMP
R8845U
W(T)
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
COM
R8845U
N.O.
X1
X2
PUMP
W(T)
L2
L1
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.
M13318
Fig. 6. R8845U hookup for L7148F/L8148E in a gas-fired, 24V, zoned, pump system.
5
69-1292
R8845U UNIVERSAL SWITCHING RELAY
L1 (HOT) L2 3
R8888 1
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
TO APPROPRIATE CONNECTIONS AS REQUIRED BY THE SYSTEM. H1-H2 TYPICALLY CONNECTED TO T-T OF BURNER CONTROL SYSTEM.
COM
ZONE 5 THERMOSTAT R(T)
ZONE 2 THERMOSTAT
CIRCULATOR PUMP 2
W
C2 C1
R
ZONE 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
R8845U
1 MAKES CONTACT ONLY ON TEMPERATURE FALL.
Fig. 8. R8845U thermostat connections.
69-1292
6
X2
M13319
R8845U UNIVERSAL SWITCHING RELAY
A.
CHECKOUT
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.
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 selfcleaning. The contacts may turn black after being in service for some time; this discoloration does not prevent proper operation. 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.
A
X1
B
X2
LOW VOLTAGE POWERPILE® CONTROLLED OUTPUT
FOR LINE VOLTAGE CONTROL
LINE VOLTAGE CONTROL 3 NEUTRAL
R8845U L1
R(T)
L2
W(T)
TROUBLESHOOTING
JUMPER
C
COM
Test Button — 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
Heat Call LED — 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.
C. FOR EXTERNAL SEPARATE LOW VOLTAGE POWER SOURCE R8845U NEUTRAL
L1
R(T)
L2
W(T)
1 COM
C
24V CONTROLLER INPUT SUPPLY
N.O.
A
X1
B
X2
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
Relay LED — This LED lights whenever there is 120 Vac (L1) on the N.O. terminal (when COM/N.O. relay contacts are closed).
Fig. 9. R8845U control options.
7
69-1292
R8845U UNIVERSAL SWITCHING RELAY
Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422
69-1292 J.S. 3-99
Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9
8
www.honeywell.com
