Honeywell
THE R841 ELECTRIC HEATING RELAY IS
USED WITH A 2-WIRE, 24V THERMOSTAT
TO PROVIDE CONTROL OF ELECTRIC
HEATING EQUIPMENT. IT IS A DIRECT-
FOLLOWING RELAY WHICH OPERATES
WITH EACH CYCLE OF THE THERMO-
STAT (4 TO 6 CYCLES PER HOUR).
❑
models are used to control one
is used either with one thermostat
load.
❑
to control two loads simultaneously, or with
two thermostats to control two independent
loads.
❑
and E models include an integral
transformer; R841 D model must be powered
from a remote 24V transformer.
❑
and D models have a 1/2 inch male
conduit bushing.
❑ The
and E models are for instal-
lation on a wireway or J-box.
❑ R841 E has a 1/2 inch male conduit bushing
and includes an enclosure with a low voltage
wiring compartment.
❑ Special
with 10 second minimum
timing between stages is available.
❑ Each relay switches up to a 5,000 watt load.
❑ Spst MICRO SWITCH snap switches are
actuated by ambient-compensated
strips.
❑ Leadwires are provided for both line voltage
and low voltage connections.
❑ Small size and silent operation allow instal-
lation in living area, utility room, or basement,
❑ May be mounted in any convenient position.
REV. 10-79 (.11)
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7/8 in. [22. 2 mm] knockouts in back and sides of
case for 1/2 in. [ 12.7 mm] conduit.
LEADWIRE LENGTH (NOMINAL):
DIMENSIONS: See Figs. 1 and 2.
Line voltage–18 in. [457.2 mm].
Low voltage–7-l/2 in. [ 190.5 mm].
OPTIONAL SPECIFICATIONS:
Line voltage–8 in. [203.2 mm].
Low voltage–4 in. [ 101.6 mm].
CASE FINISH: Zinc bichromate.
1.
with special leadwires (277 Vat, 60 Hz
only ).
2. R84
with 10 second minimum timing between
CONDUIT BUSHING:
have a 1/2 in. [12.7
stages on both make and break operation. Meets
NE-MA requirement.
mm] male conduit bushing; R841 E also has three
[3
[16.0]
[60,4]
[6.4]
,
,
0.41
15
3
I
MOUNTING HOLE AND TWO MOUNTING SLOTS FOR NO.
FOR INCH KNOCKOUT ON
8
SCREW.
“
[19.1]
29
T R A N S F O R M E R
A P P L I C A B L E
[65.8]
FIG. 1-DIMENSIONS OF
IN in. [mm IN BRACKETS].
[101.8
I
122.7]
+
7
[9.5]
718
DIAMETER
K N O CKOUT (3)
[96.4]
[63.5]
3: [100.0]
“
‘
FIG. 2–DIMENSIONS OF R841E IN in. [mm IN BRACKETS].
60-2004– 1
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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
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
Disconnect power supply before wiring to prevent
electrical shock or equipment damage.
I
I
All wiring must comply with applicable codes and
ordinances. Be sure the power supply voltage agrees with
the rating on the relay label.
Fig. 3 shows a typical installation within a compart-
ment enclosure on the end of a baseboard heater. The
back of the compartment enclosure should be equipped
with embossing to clear mounting screws.
also may be mounted on a wireway
(Fig. 4) or junction box.
FIG. 4–FOUR RELAYS MOUNTED ON WIREWAY.
1. Fasten relay securely to mounting surface using
the 2 mounting holes in the
bushing.
or the conduit
2. Disconnect the power supply.
JUNCTION
n
L2
4
RED
BLACK BLUE
LOW VOLTAGE
THERMOSTAT
RED
n
RESISTANCE
HEATER
PROTECTION
REQUIRED.
!
FIG. 3–TYPICAL INSTALLATION ON BASEBOARD
HEATER.
FIG.
INTERNAL SCHEMATIC AND CON-
NECTION DIAGRAM FOR ONE RELAY.
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TRANSFORMER
(HOT) L2
2-WIRE
THERMOSTAT
. .
BLUE
BLACK
RED
RED
LOW VOLTAGE
T H ER M O S T A T
RED
ACK
H EATER
NO.
WHITE
.
HEATER
b
LOAD
LOW VOLTAGE
THERMOSTAT
RELAY
.
.
.
.
-
-
-
RED
WHITE
LOAD
RELAY
Low
T H ER M O S T A T
●
BLACK
RED
4
—
—
LOAD
,
PROVIDEA
P R O V I D E
AS REQuIRED,
DE-ENERGIZE ALL VOLTAGE SOURCES . PROVIDE
AS REQUIRED ,
PROTECTION
FIG. 6–TWO OR MORE
RELAYS CONNECT-
FIG. 8–CONNECTIONS FOR FOUR
RELAYS
ED TO ONE THERMOSTAT SO THEY OP-
ERATE IN SEQUENCE ABOUT ONE MINUTE
APART. THIS REDUCES THE INITIAL LINE
LOAD ON LARGE KILOWATT
SET THE THERMOSTAT HEAT
AND THERMOSTATS USED WITH ONE
TRANSFORMER. SET EACH THERMOSTAT
HEAT ANTICIPATOR AT 0.2 A.
ANTICIPATOR AT 0.2A.
BOX
n
L2
E
4
“
REMOTE
(
)
TRANSFORMER
RED
BLACK
D
RED
n
WHITE
DROPPING
LOW VOLTAGE
THERMOSTAT
DISCONNECT
REQuIRED.
PROTECTION
PROTECTION AS REQUIRED.
FIG. 9–CONNECTIONS FOR TWO R841D RELAYS
USED WITH ONE TRANSFORMER AND
THERMOSTAT. SET THERMOSTAT HEAT
ANTICIPATOR AT 0.4 A.
FIG.
INTERNAL SCHEMATIC AND CON-
NECTION DIAGRAM FOR ONE RELAY.
5
60-2004–1
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2-WIRE
24 V
THERMOSTAT
NO
24 V
THERMOSTAT
NO.
2
2-WIRE
24
V
RED
—
-
(L3 FOR 208, 240, OR 277 V]
(L3 FOR 208,240, OR
V)
DISCONNECT
REQUIRED
REQ U I R E D .
T
H
E
R
M
O
S
T
A
T
FIG. IO–TYPICAL WIRING HOOKUP FOR R841E
WITH ONE THERMOSTAT OPERATING
TWO LOADS SIMULTANEOUSLY.
FIG. II–TYPICAL WIRING HOOKUP FOR R841E
WITH TWO THERMOSTATS, EACH WITH
ITS OWN LOAD.
24 V
THERMOSTAT
E
JUNCTION HEATER
00x
1
YELL
ELECTRIC
RED
Q
YELLOW
(L3 FOR 208, 240,
277 V)
I. 12–TYPICAL WIRING HOOKUP FOR
WITH ONE THERMOSTAT CONNECTED TO ONE LOAD SO
THAT BOTH SIDES OF THE SINGLE PHASE LINE ARE SWITCHED.
6
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The cycling pattern of the R841 is determined by the
thermostat(s). On a call for heat, the thermostat(s)
activates the low voltage resistance heater(s) in the
frequency, the R841 switch contacts make
mately 75 seconds (from cold start) after the thermostat
calls for heat. (The top switch on the special R841 E
with optional specification is adjusted to approximately
55 seconds; the bottom switch to approximately 75
seconds. This allows, at the very minimum, 10 seconds
between stages in both make and break sequence.)
The heater(s) drives the
MICRO SWITCH snap-acting switch or switches.
strip is ambient temperature compensated
strip(s) to actuate
the
The
within the specified ambient range. At rated voltage and
After mounting and wiring have been completed, turn
on the power supply. Set the thermostat above room
perature until the electric heating equipment starts.
Permit the system to operate long enough to prove the
heating equipment functions properly. Return the
mostat to the desired room temperature before leaving
the installation.
Please send your
Inc.
Honeywell Plaza
and suggestions to:
Dear Customer,
We welcome your comments and suggestions for improving this
cation. Your assistance is greatly appreciated and will
better information for ye”.
us to provide
Minneapolis, Minnesota 55408
ATTN: Publications Supervisor MN 12-3247
HONEYWELL MINNEAPOLIS, MN 5540S INTERNATIONAL
Australia, Canada, Finland, France, Japan, Mexico,
Offices in all principal
of tha world. Manufacturing in
Spain, United Kingdom, U.S.A.
PRINTED IN U.S.A.
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