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.
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
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
