R8845U UNIVERSAL SWITCHING RELAY
3
68-0215—02
Fig. 1. R8845U dimensions in in. (mm).
INSTALLATION
When Installing this Product . . .
1.
Read these instructions carefully. Failure to follow
them could damage the 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.
Installer must be a trained, experienced service techni-
cian.
4.
After installation is complete, check out product opera-
tion as provided in these instructions.
5.
Follow local codes for installation and application.
WARNING
Electrical Shock Hazard.
Can cause severe injury or death.
The transformer core is 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 sur-
faces 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 or Personal Injury Hazard.
Can cause severe 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.
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 outputs. Never connect load
terminals to a load that uses more current than the amount
listed in the electrical ratings on the relay. See Table 2 for
maximum lowvoltage wiring length specifications. See the
schematic and typical hookups in Fig. 2 through 9.
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
Table 2. Low Voltage Maximum Wire Lengths.
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
