Honeywell Switch RA889A User Manual

RA889A  
Switching Relay  
PRODUCT DATA  
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.  
Contents  
® U.S. Registered Trademark  
Copyright © 2000 Honeywell Inc. • All Rights Reserved  
68- 0216- 2  
 
   
RA889A SWITCHING RELAY  
Cross Reference:  
Replacement Parts:  
The RA889A replaces many Honeywell  
models. See Table 1 for additional cross reference  
information.  
32002190-001 Replacement Relay.  
Relay Fuse: 1A automotive fuse.  
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.  
Table 1. RA889A Replacement Cross Reference.  
Connections  
Low  
Manu-  
facturer  
Input Line  
Voltage  
Voltage  
Relay  
Model  
Power Relay  
Thermostat  
Comments  
Honeywell RA889A L1  
L2 COM N.O. N.C. X1 X2 W(T) R(T)  
C
a
Honeywell  
1
1
2
2
3
7
4
8
T
T
RA89A  
a
B
R
See Fig. 6  
thermostat  
connections  
Jumper L1 to COM and between X1  
and R(T) in RA889A.  
R182A  
R182B  
1
1
2
2
8
8
6
6
7
7
B
B
R
R
Requires jumper between X1 and  
R(T).  
b
b
R182C  
R482B  
1
1
2
2
8
8
6
6
7
7
Jumper R(T) to  
W(T).  
Line voltage switched inputs go to L1  
and L2. See Fig. 7B.  
R482C  
b
1
2
6
8
7
Line voltage inputs go to L1 and L2.  
See Fig. 7B.  
R482J  
a
8
7
W
B
R882A  
R882B  
8
8
6
6
7
7
W
W
B
B
b
R882C  
b
6
8
7
1
2
R882J  
a
b
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  
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.  
When Installing this Product . . .  
1.  
2.  
Read these instructions carefully. Failure to follow them  
could damage the product or cause a hazardous condi-  
tion.  
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 techni-  
cian.  
After installation is complete, check out product opera-  
tion as provided in these instructions.  
Follow local codes for installation and application.  
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.  
3.  
4.  
5.  
1.  
2.  
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.  
WARNING  
Electrical Shock Hazard.  
3.  
4.  
Hang the relay on the screw, position the case, and start  
the bottom screw.  
Tighten both screws.  
Power supply can cause severe injury or death.  
Transformer core not bonded.  
Disconnect power supply before wiring.  
3
68-02162  
 
   
RA889A SWITCHING RELAY  
WIRING  
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.  
WARNING  
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).  
Electrical Shock Hazard.  
All wiring must comply with all applicable electrical codes,  
ordinances, and regulations. Follow all instructions furnished  
with the controlled equipment.  
CHECKOUT  
1.  
IMPORTANT  
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 opera-  
tion.  
After installation is complete, operate system through at  
least one cycle from the controller to make certain the  
relay controls the equipment as intended.  
The switching relay terminals are approved only for  
use with copper wires.  
2.  
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.  
3.  
Table 2. Wire Lengths.  
Wire Length of Run to  
.TROUBLESHOOTING  
Total Wire Length  
Feet Meters  
120 38.0  
Thermostat  
Wire Size  
(AWG)  
Test Button  
Feet Meters  
This connection is the same as a call for heat connection  
between the R(T) and W(T) terminals.  
22  
20  
18  
16  
14  
60  
18.0  
30.5  
45.5  
76.0  
122.0  
200  
300  
500  
800  
61.0  
100  
150  
250  
400  
91.5  
Relay LED  
This LED lights whenever there is 120 Vac (L1) on the N.O.  
terminal (when COM/N.O. relay contacts are closed).  
152.5  
244.0  
LOW VOLTAGE (CLASS 2)  
2-WIRE THERMOSTAT  
AUTOMOTIVE  
FUSE  
C
R(T) W(T)  
RELAY  
LED  
X1  
X2  
G
L2  
L1  
COM  
N.O.  
N.C.  
1
LOW-VOLTAGE  
1
POWERPILE®  
L1  
L2 HOT  
TO  
POWER  
TO  
POWER  
LOAD 1  
POWER SUPPLY. PROVIDE OVERLOAD PROTECTION  
AND DISCONNECT MEANS AS REQUIRED.  
1
M14295  
Fig. 2. RA889A internal schematic and typical hookup.  
68-02162  
4
 
       
RA889A SWITCHING RELAY  
T87F  
T87F  
T87F  
RA889A  
RA889A  
RA889A  
RELAY  
R(T) W(T)  
R(T) W(T)  
R(T) W(T)  
L1  
L2  
COM N.O.  
X1  
X2  
L1  
L2  
COM N.O.  
X1  
X2  
L1  
L2  
COM N.O.  
X1  
X2  
L1  
(HOT)  
PUMP  
PUMP  
PUMP  
1
L2  
ORANGE  
WHITE  
F
F
T
T
G
L2  
L1  
T
T
2
3
C554  
C1 C2  
B2 B1  
BLACK  
BURNER  
AND  
IGNITION  
L7148A/L8148A  
R8184G  
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
1
2
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.  
B1 IS 1/4 IN. TAB TERMINAL.  
M14301  
3
Fig. 3. RA889A hookup for L7148A/L8148A in an oil-fired, tankless hot water, zoned, pump system.  
T87F  
T87F  
T87F  
RA889A RELAY  
RA889A  
X1 X2  
RA889A  
X1 X2  
W(T)  
R(T) W(T)  
R(T) W(T)  
R(T)  
COM  
N.O.  
COM  
N.O.  
N.O.  
L1 L2  
L1 L2 COM  
X1 X2  
L2  
L1  
L1  
(HOT)  
PUMP  
PUMP  
PUMP  
1
L2  
G
L2  
L1  
T
T
TR  
THTR  
TH  
LOW VOLTAGE  
GAS VALVE  
(eg, VR8300)  
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
1
2
3
C1 C2  
B2 B1  
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND.  
USE GROUNDING SCREW PROVIDED.  
L7148F/L8148E  
B1 IS 1/4 IN. TAB TERMINAL.  
M13314  
Fig. 4. RA889A hookup for L7148F/L8148E in a gas-fired, 24V, zoned, pump system.  
5
68-02162  
 
RA889A SWITCHING RELAY  
L1  
(HOT)  
R8888  
L2  
3
1
G
RA889A  
L2  
CIRCULATOR  
PUMP 5  
L1  
4
20 VA  
N.O.  
X1  
ZC  
H1  
TO APPROPRIATE  
CONNECTIONS  
AS REQUIRED  
BY THE SYSTEM.  
H1-H2 TYPICALLY  
CONNECTED TO  
T-T OF BURNER  
CONTROL SYSTEM.  
H2  
X2  
ZONE 1  
THERMOSTAT  
CIRCULATOR  
PUMP 1  
COM  
ZONE 5  
THERMOSTAT  
ZONE 1  
ZONE 2  
R(T)  
W(T)  
ZONE 2  
THERMOSTAT  
CIRCULATOR  
PUMP 2  
G
ZONE 3  
THERMOSTAT  
CIRCULATOR  
PUMP 3  
ZONE 3  
ZONE 4  
1
ZONE 4  
THERMOSTAT  
CIRCULATOR  
PUMP 4  
2
1
2
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND.  
USE GROUNDING SCREW PROVIDED.  
3
4
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
USE COPPER CONDUCTORS ONLY. FOR ALL CLASS 1  
CONNECTIONS, USE WIRE RATED FOR AT LEAST 167°F (75°C).  
CONNECT L1-ZC JUMPER, IF REQUIRED.  
M13321  
Fig. 5. R8888 zone expansion using RA889A Switching Relays.  
THREE-WIRE  
LOW VOLTAGE  
(SERIES 10)  
TWO-WIRE  
LOW VOLTAGE  
(SERIES 80)  
THERMOSTAT  
1
THERMOSTAT  
R(T)  
W(T)  
B
R(T)  
R(T)  
W(T)  
X1  
W(T)  
X2  
X2  
X1  
C
C
RA889A  
RA889A  
M13316  
MAKES CONTACT ONLY ON TEMPERATURE FALL.  
1
Fig. 6. RA889A thermostat connections.  
68-02162  
6
 
RA889A SWITCHING RELAY  
A. FOR 24V THERMOSTAT CONTROL  
RA889A  
R(T)  
L1  
THERMOSTAT  
R
L1, (HOT)  
NEUTRAL  
L2  
W(T)  
C
W
C
OPTIONAL  
2
COM  
N.O.  
N.C.  
LINE VOLTAGE  
CONTROLLED  
OUTPUTS  
X1  
X2  
LOW VOLTAGE  
CONTROLLED OUTPUT  
B. FOR LINE VOLTAGE CONTROL  
LINE VOLTAGE  
RA889A  
CONTROL  
R(T)  
L1  
3
JUMPER  
NEUTRAL  
L2  
W(T)  
C
COM  
N.O.  
N.C.  
X1  
X2  
C. FOR EXTERNAL SEPARATE LOW VOLTAGE POWER SOURCE  
RA889A  
R(T)  
L1  
NEUTRAL  
L2  
W(T)  
C
24V CONTROLLER  
INPUT SUPPLY  
1
COM  
N.O.  
N.C.  
X1  
X2  
1
2
REQUIRED FOR OUTPUT LED OPERATION.  
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  
M13317A  
DRY CONTACTS.  
Fig. 7. RA889A control options.  
7
68-02162  
 
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  
Honeywell Asia Pacific Inc.  
Room 3213-3225  
Sun Hung Kai Centre  
No. 30 Harbour Road  
Wanchai  
M2H 3N7  
Hong Kong  
Honeywell Latin American Region  
480 Sawgrass Corporate Parkway  
Suite 200  
Honeywell Europe S.A.  
3 Avenue du Bourget  
1140 Brussels  
Sunrise FL 33325  
Belgium  
Printed in U.S.A. on recycled  
paper containing at least 10%  
post-consumer paper fibers.  
68-02162 G.R. Rev. 5-00  
 

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