Honeywell RA89 Installation Manual

R182J, R482J, YHR845A,R847A, RA89A,
RA832A Switching Relays

INSTALLATION INSTRUCTIONS

These relays can be used for a variety of switching applications. Typically they provide control of line- or low-voltage
devices by a low voltage controller. See Table 1.

Models Application

R182J For 24V thermostat control of

R482J Controlled by a line voltage

YHR845A For hot water zone control

R847A Provides switching for high-

RA89A For switching one line

RA832A For switching two line load

a

IMPORTANT:

line voltage devices.

controller.

systems or spst control of
two separate loads.

current loads such as cooling
compressors.

voltage load.

voltage loads with a common
power source.

The transformer on the R182 can overheat
when used with a series 20 thermostat if the
total resistance of the thermostat circuit
exceeds 2.5 ohms. If the measured resistance
of the thermostat (including thermostat wire and
thermostat contact resistance) exceeds 2.5
ohms, add a 100 ohm, 10 watt resistor between
the W and R terminals. Table 2 gives maximum
thermostat wire runs; if longer runs are neces­sary, measure the resistance or add a 100 ohm,
10 watt resistor across terminals W and R.

Table 1. Switching Relay Specifications.

Coil

Wire
Size

Vol tag e

(Vac at

50/60 Hz)

Table 2. Length of Wire.

Relay Coil

Current (A)

a

0.40

Tot al W ire

Length

Feet Meters Feet Meters

Length of Run to

Thermostat

Vol tag e

(50/60 Hz)

120 Dpdt 3-wire 24

240 3.7 22.2

120 2-wire 120 0.08 7.4 44.4

208/240 208/240 0.04 3.7 22.2

120 Dpst 24 0.40 7.4 44.4

120 22 100

240 10 50

120 Spst 10.2 61.2

120 Dpst 7.4 44.4

240 3.7 22.2

Switch

Control

Action

Circuit

AWG

(Number)

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

Contact

Ratings (A)

AFL ALR

7.4 44.4

(Wires)

69-2041

R182J, R482J, YHR845A,R847A, RA89A, RA832A SWITCHING RELAYS

INSTALLATION

When Installing this Product

1. Read these instructions carefully. Failure to follow
instructions can damage 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. Make sure installer is a trained, experienced service
technician.

4. After completing installation, use these instructions
to check out product operation.

WARNING

Electrocution Hazard.
Can cause property damage, severe injury, or
death.

Transformer core not bonded.

Disconnect power supply before wiring to prevent
electrical shock or equipment damage.

Mounting

For replacement, mount the relay in the same location as
the old relay. If this is a new installation, 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 for the keyhole type mounting hole in
the upper right corner. 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

All wiring must comply with all applicable electrical codes,
ordinances, and regulations. Follow any instructions
furnished with the controlled equipment.

IMPORTANT:

The switching relay terminals are approved for
use with copper wires only.

See Fig. 2 through 9 for hookup diagrams for these
relays. When two or more devices are to be controlled in
parallel, the total current must not exceed the relay load
rating. Fig. 10 is an internal view of the RA832A showing
terminal locations and barriers.

Never connect load terminals to a load that takes more
current than the amount listed in the electrical ratings on
the relay.

1

4 (108)

3

(2) DIAMETER

32

(13) DIAMETER

1

3 (89)

2

3

1 (35)

8

4

7

1

8

(48)

7

(22) DIAMETER

8

KEYHOLE TYPE
MOUNTING HOLE

3

(10)

8

2

(75)

7

1

8

(48)

KNOCKOUT FOR
1/2 (13) CONDUIT (3)

4

(114)

15
16

1
2

1

5

4

(133)

3

(10)

8

M3823B

5

1 (29)

32

1
2

7

(6) DIAMETER MOUNTING HOLE

32

25

(20)

32

Fig. 1. Approximate mounting dimensions in in. (mm).

LOW VOLTAGE (CLASS 2)
2-WIRE THERMOSTAT

RA89A (SPST)

TT

JUMPER

21 34

L2

1

2

TO LOAD

L1

1

HOT

POWER SUPPLY. PROVIDE OVERLOAD PROTECTION
AND DISCONNECT MEANS AS REQUIRED.

COMPLETE WIRING AS SHOWN ABOVE.

Fig. 2. Internal schematic and typical hookup for

2

21 34

L2

1

CONTROLLER
(IF USED)

RA89A.

RA89A

JUMPER REMOVED

L1
HOT

1

TO LOAD

M3819A

69-2041 2