Honeywell R845A - Manual
This Installation Manual covers Honeywell’s line of switching relays, detailing their technical specifications such as voltage ratings, coil currents, and contact capacities across models like R182J and RA832A. The guide highlights critical safety considerations–including overheating risks–and provides wiring diagrams for proper installation in residential or commercial electrical systems, emphasizing correct mounting and circuit configurations to ensure reliable performance. It also includes maintenance tips for troubleshooting common operational issues.
Table of Contents:
- Page 1 – Switching Relay Specifications and Wire Lengths
- Page 2 – Electrical Relay Installation and Wiring Guidelines
- Page 3 – Thermostat Wiring Schematics and Configurations
- Page 4 – Relay Service Instructions and Wiring Diagrams
1
69-0791—3
J.H. • Rev. 10-94 • ©Honeywell Inc. 1994 • Form Number 69-0791—3
R182J, R482J, R845A,
R847A, RA89A, RA832A
Switching Relays
Application
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.
TABLE 1—SWITCHING RELAY SPECIFICATIONS.
TRADELINE
®
Voltage
Switch Control
Coil
Voltage
(Vac at
Relay Coil
Current
Contact
Ratings (A)
Models
Application
(50/60 Hz)
Action
Circuit
50/60 Hz)
(A)
AFL ALR
R182J
For 24V thermostat
120
Dpdt
3-wire
24
0.40
a
7.4
44.4
control of line voltage
devices.
240
3.7
22.2
R482J
Controlled by a line
120
2-wire
120
0.08
7.4
44.4
voltage controller
208/240
208/240
0.04
3.7
22.2
R845A
For hot water zone control
systems or spst control of
two separate loads.
120
Dpst
24
0.40
7.4
44.4
R847A
Provides switching for
120
22
100
high-current loads such as
cooling compressors.
240
10
50
RA89A
For switching one line
voltage load.
120
Spst
10.2
61.2
RA832A
For switching two line
120
Dpst
7.4
44.4
voltage loads with a
common power source.
240
3.7
22.2
a
IMPORTANT:
The transformer on the R182 can over-
heat 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 thermo-
stat (including thermostat wire and thermostat con-
tact 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 2—LENGTH OF WIRE.
AWG
Wire
Size
Total Wire
Length
Length of Run
to Thermostat
(Wires)
(Number)
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
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About this manual
- Brand
- Honeywell
- Model
- R845A
- Document type
- Manual
- Language(s)
- English
- Pages
- 4
- File size
- 154.3 KB
- Format
Summary
Specifications for relay models including voltage, switch action, coil current, contact ratings, and maximum wire run lengths. Includes a warning regarding overheating risks with the R182 model.
Installation instructions, safety warnings, mounting guidelines with dimensional diagrams, and wiring specifications using schematic diagrams for electrical relays.
Internal schematic diagrams and hookup instructions for thermostat models, including wiring configurations for different voltage types and multi-zone hydronic heating systems.
