Honeywell RA889A User manual

PRODUCT DATA
68- 0216- 2
® U.S. Registered Trademark
Copyright © 2000 Honeywell Inc. • All Rights Reserved
RA889A
Switching Relay
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.
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.)
Contents
Application ........................................................................ 1
Features ........................................................................... 1
Specifications ................................................................... 2
Ordering Information ........................................................ 2
Installation ........................................................................ 3
Mounting........................................................................... 3
Wiring ............................................................................... 4
Operation .......................................................................... 4
Checkout .......................................................................... 4
Troubleshooting............................................................... 4

RA889A SWITCHING RELAY
68-0216—2 2
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 [phone]
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.
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: 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 exter-
nal 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.
Dimensions: See Fig. 1.
Fig. 1. RA889A dimensions in in. (mm).
7/32 (6)
DIAMETER
MOUNTING
HOLE
KNOCKOUT
FOR 1/2 (13)
CONDUIT (3)
1-1/16
(27) 1-1/4 (32)
2-3/16
(56)
3-1/2
(89)
3-11/16 (94) 5/16
(8)
5/16 (8)
6-1/4
(159)
5-3/8
(137)
1-3/8 (35)
4-7/16 (118)
2-1/8
(54)
3/16 (5) DIAMETER
3/8 (10) DIAMETER
7/8(22)
DIAMETER
KEYHOLE
TYPE
MOUNTING
HOLE
M17512

RA889A SWITCHING RELAY
3 68-0216—2
Cross Reference: The 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.
aRA889A has one set of COM/N.O. relay contacts. Use R8845U if two sets are required.
bRA89A 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.
Manu-
facturer Model
Connections
Comments
Input Line
Voltage Power Relay
Low
Voltage
Relay Thermostat
Honeywell RA889A L1 L2 COM N.O. N.C. X1 X2 W(T) R(T) C —
Honeywell RA89Aa123 4 ———TT——
R182Aa127 8 —B R See Fig. 6
thermostat
connections
Jumper L1 to COM and between X1
and R(T) in RA889A.
R182B 1 2 8 6 7 B R Requires jumper between X1 and
R(T).
R182Cb128 6 7 BR
R482B 1 2 8 6 7 ——Jumper R(T) to
W(T). Line voltage switched inputs go to L1 and L2. See Fig. 7B.
R482Cb128 6 7 ——
R482Jb126 8 7 —— Line voltage inputs go to L1 and L2.
See Fig. 7B.
R882Aa——87———W—B—
R882B ——867——W—B
R882Cb——867——W—B
R882Jb——687——1—2

RA889A SWITCHING RELAY
68-0216—24
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).
Wire Size
(AWG) Total Wire Length Wire Length of Run to
Thermostat
Feet 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
L1
HOTL2
R(T) W(T) C
L2 L1
1
1
LOW VOLTAGE (CLASS 2)
2-WIRE THERMOSTAT
POWER SUPPLY. PROVIDE OVERLOAD PROTECTION
AND DISCONNECT MEANS AS REQUIRED.
X2X1
RELAY
LED
LOW-VOLTAGE
POWERPILE®
GN.O.COM
TO
POWER
N.C.
LOAD 1 TO
POWER
1
M14295
AUTOMOTIVE
FUSE

RA889A SWITCHING RELAY
5 68-0216—2
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.
GL2L1 T T
C1 C2 B2 B1
F
F
T
T
L1
(HOT)
L2
PUMP PUMP PUMP
T87F T87F T87F
RA889A
RELAY
RA889A RA889A
C554
R8184G
BURNER
AND
IGNITION
ORANGE
WHITE
BLACK
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.
1
2
L7148A/L8148A
2
1
M14301
3
3
X2X1N.O.
COM
L2L1
W(T)R(T)
X2X1N.O.
COM
L2L1
W(T)R(T)
X2X1N.O.
COM
L2L1
W(T)R(T)
R(T) W(T)R(T) W(T)
R(T) W(T)
L1 L2
COM N.O.
X1 X2
GL2L1 T T
C1 C2 B2 B1
L1
(HOT)
L2
PUMP PUMP PUMP
T87F T87F T87F
RA889A RELAY RA889A RA889A
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.
1
2
3
3
L7148F/L8148E
2
1
M13314
LOW VOLTAGE
GAS VALVE
(eg, VR8300)
TR
TH
THTR
L1 L2
COM N.O.
X1 X2 L1 L2
COM N.O.
X1 X2

RA889A SWITCHING RELAY
68-0216—26
Fig. 5. R8888 zone expansion using RA889A Switching Relays.
Fig. 6. RA889A thermostat connections.
C2 C1
H1 H2
L2 L1 L1 ZC
R W
R C A B C
R W R W R W
C2 C1 C2 C1 C2 C1
ZONE 1
ZONE 2
ZONE 3
ZONE 4
CIRCULATOR
PUMP 1
CIRCULATOR
PUMP 2
CIRCULATOR
PUMP 3
CIRCULATOR
PUMP 4
CIRCULATOR
PUMP 5
ZONE 1
THERMOSTAT
ZONE 5
THERMOSTAT
ZONE 2
THERMOSTAT
ZONE 3
THERMOSTAT
ZONE 4
THERMOSTAT
L1
L2
X2
X1
N.O.
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND.
USE GROUNDING SCREW PROVIDED.
1
1
20 VA
M13321
R8888 1
G
RA889A
R(T)
W(T)
TO APPROPRIATE
CONNECTIONS
AS REQUIRED
BY THE SYSTEM.
H1-H2 TYPICALLY
CONNECTED TO
T-T OF BURNER
CONTROL SYSTEM.
ZC
H1
H2
2
2
USE COPPER CONDUCTORS ONLY. FOR ALL CLASS 1
CONNECTIONS, USE WIRE RATED FOR AT LEAST 167°F (75°C).
G
L2 L1
3
4
4
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
CONNECT L1-ZC JUMPER, IF REQUIRED.
L1
(HOT) L2 3
COM
W(T)
C
R(T)
X1
B
X2
W(T)
RA889A RA889A
THREE-WIRE
LOW VOLTAGE
(SERIES 10)
THERMOSTAT
TWO-WIRE
LOW VOLTAGE
(SERIES 80)
THERMOSTAT
1
1MAKES CONTACT ONLY ON TEMPERATURE FALL.
M13316
R(T)
CX1 X2
W(T)
R(T)

RA889A SWITCHING RELAY
7 68-0216—2
Fig. 7. RA889A control options.
L1
L2
COM
R(T)
N.C.
N.O.
C
W(T)
RA889A
M13317A
A. FOR 24V THERMOSTAT CONTROL
R
C
W
THERMOSTAT
B. FOR LINE VOLTAGE CONTROL
C. FOR EXTERNAL SEPARATE LOW VOLTAGE POWER SOURCE
OPTIONAL
L1, (HOT)
NEUTRAL
LINE VOLTAGE
CONTROLLED
OUTPUTS
X2
X1 LOW VOLTAGE
CONTROLLED OUTPUT
L1
L2
COM
N.C.
N.O.
C
RA889A
JUMPER
LINE VOLTAGE
CONTROL
NEUTRAL
X2
X1
L1
L2
COM
N.C.
N.O.
C
RA889A
NEUTRAL
X2
X1
24V CONTROLLER
INPUT SUPPLY
R(T)
W(T)
R(T)
W(T)
1 REQUIRED FOR OUTPUT LED OPERATION.
2 FOR SERIES 10 OR OTHER HARDWIRED ELECTRONIC 3-WIRE
THERMOSTATS.
3WARNING! 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.
1
2
3

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