Honeywell Home RA889A User manual

PRODUCT DATA
68-0216-03
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 Resideo models. (See Table
1 Replacement Cross Reference.)
Contents
Application ..................................................................................... 1
Features .......................................................................................... 1
Specifications ............................................................................... 2
Installation .................................................................................... 3
Mounting ........................................................................................ 3
Wiring .............................................................................................. 3
Operation ....................................................................................... 4
Checkout ........................................................................................ 4
Troubleshooting .......................................................................... 4

RA889A SWITCHING RELAY
68-0216—03 2
SPECIFICATIONS
IMPORTANT
The specifications given in this publication do not
include normal manufacturing tolerances. There-
fore, this unit may not exactly match the listed
specifications. Also, this product is tested and cali-
brated under closely controlled conditions, and
some minor differences in performance can be
expected if those conditions are changed.
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
external loads. Secondary protected by replaceable 1A
automotive 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).
Cross Reference: The RA889A replaces many Resideo
models. See Table 1 for additional cross reference
information.
Thermostat Compatibility: Compatible with most digital
and mechanical, low-voltage thermostats. For mechanical
thermostats, use 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.
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
368-0216—03
Table 1. RA889A Replacement Cross Reference.
aRA889A has SPDT relay with one normally-open and one normally-closed, line-voltage rated contacts. Use R8845U if two
sets of normally-open, line-voltage rated contacts 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 hazard-
ous 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 tech-
nician.
4. After installation is complete, check out product
operation 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
surfaces 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.
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.
Model
Connections
Comments
Input Line
Voltage Power Relay
Low
Voltage
Relay Thermostat
RA889A L1 L2 COM N.O. N.C. (A) X1 X2 W(T) R(T) C —
RA89Aa1 2 3 4 — ——T T — —
R182Aa12 7 8 — BRSeeFig.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).
R182Cb12 8 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.
R482Cb12 8 6 7 ——
R482Jb1 2 6 8 7 — — Line voltage inputs go to L1 and
L2. See Fig. 7B.
R882Aa— — 8 7 — ——W — B —
R882B — — 8 6 7 — — W — B
R882Cb— — 8 6 7 ——W — B
R882Jb— — 6 8 7 ——1 — 2

RA889A SWITCHING RELAY
68-0216—03 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. 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
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.
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.
N.C. IS LABELED “A” ON SOME RA889A MODELS.
TO SIMPLIFY THE DIAGRAM, THE ABOVE DRAWING DOES NOT MATCH
THE TERMINAL LOCATION ON RA889A.
X2X1
RELAY
LED
LOW-VOLTAGE
POWERPILE®
GN.O.
COM
TO
POWER
N.C.
LOAD 1
TO
POWER
1
M37928
AUTOMOTIVE
FUSE
2
3
2
3

RA889A SWITCHING RELAY
568-0216—03
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.
GL2
L1 TT
C1 C2 B2 B1
F
F
T
T
L1
(HOT)
L2
PUMP PUMP PUMP
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.
C WIRE IS OPTIONAL OR UNUSED ON SOME THERMOSTATS.
1
2
L7148A/L8148A
2
1
M14301A
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)
4
4
RWCTHERMOSTAT
C
4
RWCTHERMOSTAT
C
4
RWCTHERMOSTAT
C
R(T)R(T)
R(T)
L1 L2
COM N.O.
X1 X2
GL2 L1 TT
C1 C2 B2 B1
L1
(HOT)
L2
PUMP PUMP PUMP
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.
C WIRE IS OPTIONAL OR UNUSED ON SOME THERMOSTATS.
1
2
3
3
L7148F/L8148E
2
1
M13314A
LOW VOLTAGE
GAS VALVE
(eg, VR8300)
TR
TH
THTR
L1 L2
COM N.O.
X1 X2 L1 L2
COM N.O.
X1 X2
W(T) W(T) W(T)
4
RWCTHERMOSTAT
C
4
RWCTHERMOSTAT
C
4
RWCTHERMOSTAT
C
4

RA889A SWITCHING RELAY
68-0216—03 6
Fig. 5. RA889A control options.
L1
L2
COM
R(T)
N.C.
N.O.
C
W(T)
RA889A
M13317B
A. FOR 24V THERMOSTAT CONTROL
R
C
W
THERMOSTAT
B. FOR LINE VOLTAGE CONTROL
C. FOR EXTERNAL SEPARATE LOW VOLTAGE POWER SOURCE
D. TWO WIRE, LOW-VOLTAGE THERMOSTAT WITHOUT COMMON WIRE
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 LOW-VOLTAGE HEATING THERMOSTAT. C WIRE IS OPTIONAL OR
UNUSED ON SOME 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.
4 N.C. IS LABELED “A” ON SOME RA889A MODELS.
5 TO SIMPLIFY THE DIAGRAM, THE ABOVE DRAWING DOES NOT
MATCH THE TERMINAL LOCATION ON RA889A.
6 MAKES CONTACT ONLY ON TEMPERATURE FALL.
1
2
3
4
5
4
5
4
5
W(T)
C
R(T)
X1
B
X2
W(T)
RA889A RA889A
THREE-WIRE,
LOW VOLTAGE
(SERIES 10)
THERMOSTAT
TWO WIRE,
LOW-VOLTAGE
THERMOSTAT WITHOUT
COMMON WIRE
6
R(T)
CX1 X2
W(T)
R(T)
RW

RA889A SWITCHING RELAY
768-0216—03

RA889A SWITCHING RELAY
This product is manufactured by Resideo Technologies, Inc., Golden Valley, MN, 1-800-468-1502
©2019 Resideo Technologies, Inc. The Honeywell Home trademark is used under license from Honeywell International Inc. All rights reserved.
www.resideo.com
Resideo Inc., 1985 Douglas Drive North,
Golden Valley, MN 55422
68-0216—03 M.S. Rev. 04-19 | Printed in United States