Honeywell RA832, RA889, RA89 User Manual
TRADELINE
RA89A, RA832A, R845A
Switching Relays
Application
These relays can be used for a variety of switching
applications. Typically they provide control of line- or lowvoltage devices by a low voltage controller.
The RA89A is a pdst relay. A parallel, double pole relay
provides one line voltage connection with increased current
capacity. A removable jumper allows line voltage to be selected
from the transformer input or through a separate connection.
The RA832A is a tpst relay. One relay pole is designed
for low voltage or millivoltage (Powerpile) auxiliary load.
Two other relay poles are for line voltage loads.
The R845A is a dpst relay. One relay pole can switch
line voltage while the other pole is used for line- or lowvoltage switching. All relays have an internal transformer
to provide low voltage power for the controller.
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 pre-
vent 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 near 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 sheetmetal, 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 (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.
Fig. 1—Approximate mounting dimensions in
in. [mm].
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
M3823
5
1 [29]
32
1
2
7
[6] DIAMETER MOUNTING HOLE
32
25
[20]
32
WIRING
All wiring must comply with all applicable electrical
codes, ordinances, and regulations. Follow any instructions
furnished with the controlled equipment.
1 69-0791BG. H. • 10-93 • ©Honeywell Inc. 1993 • Printed in U. S. A. • Form Number 69-0791B
IMPORTANT: The switching relay terminals are ap-
L1
HOT
L2
2
1
3
4
1
1
RA845A RELAY
POWER SUPPLY. PROVIDE OVERLOAD PROTECTION
AND DISCONNECT MEANS AS REQUIRED.
IF CONTROLLING TWO LOADS, USE:
3 AND 4 FOR LINE VOLTAGE LOAD
5 AND 6 FOR LINE OR LOW VOLTAGE LOAD
IF USING LOW VOLTAGE, USE A SEPARATE TRANSFORMER.
M3822
T
T
THERMOSTAT
ZONE 1
ZC
ZP
B1
B2
C1
C2
1
2
BURNER
CIRC.
LINE
THERM.
BURNER
CONTROL
CIRCULATOR
ZONE 1
2
3
THERMOSTAT
ZONE 2
CIRCULATOR
ZONE 2
TO ADDITIONAL R845A
RELAYS FOR OTHER ZONES
HYDRONIC HEATING
CONTROL TERMINALS
2
3
5
6
proved for use with copper wires only.
See Figs. 2-5 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. 6 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.
Fig. 2—Internal schematic and typical hookup
for RA89A.
LOW VOLTAGE (CLASS 2)
2-WIRE THERMOSTAT
TT
RA89A (SPST)
2
21 34
RA89A
JUMPER REMOVED
Fig. 4—Schematic diagram showing R845A in
multizone, forced hydronic heating system.
This arrangement is suitable for any number of
additional zones.
JUMPER
21 34
L2
1
2
Fig. 3—Internal schematic and typical hookup
for RA832A.
TO LOAD
L1
1
HOT
POWER SUPPLY. PROVIDE OVERLOAD PROTECTION
AND DISCONNECT MEANS AS REQUIRED.
COMPLETE WIRING AS SHOWN ABOVE.
LOW VOLTAGE (CLASS 2)
2-WIRE THERMOSTAT
TT
21 34
L2
1
XX
LOAD 1
L1
1
HOT
POWER SUPPLY. PROVIDE OVERLOAD PROTECTION
AND DISCONNECT MEANS AS REQUIRED.
L2
CONTROLLER
(IF USED)
RA832A
LOAD 2
(OPTIONAL)
1
AUXILIARY TO LOW
OR MILLIVOLTAGE
(POWERPILE) LOAD
L1
HOT
1
M3821
TO LOAD
M3819
Fig. 5—R845A hookup for controlling two loads.
LOW VOLTAGE (CLASS 2)
2-WIRE THERMOSTAT
2
TO
POWER
R845A
65
3
LOAD 2
M3820
TT
21 34
1
L1
HOTL2
POWER SUPPLY. PROVIDE OVERLOAD PROTECTION
1
AND DISCONNECT MEANS AS REQUIRED.
WHEN CONTROLLING TWO LOADS, USE 3 AND 4
2
FOR LINE VOLTAGE LOAD AND 5 AND 6 FOR LINE
OR LOW VOLTAGE LOAD.
IF USING LOW VOLTAGE, USE A SEPARATE
3
TRANSFORMER.
1 1
TO
POWER
LOAD 1
2
Fig. 6—Internal view of RA832A Switching
Relay.
T
X
T
X
24V TRANSFORMER
12
34
RELAY
Service and Checkout
1. Never use oil on any part of the relay coil or contacts.
2. Keep the cover on the relay during normal operation
and remove only for service and checkout.
3. Relay contacts require no cleaning. They are arranged
so they 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.
4. After installation is complete, operate system through
at least one cycle from the controller to make certain the
relay controls the equipment as intended.
M3824
3 69-0791B
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