®
The Round Creative Series
Y460A2003 Thermostat
INSTALLATION MANUAL
The Y460A2003 Thermostat is for 15 to 30 Vac control
of gas- or oil-fueled warm air, steam or hot water
heating/electric cooling systems.
IMPORTANT:
Turn off power to the system at the main fuse
or circuit breaker panel. Most buildings have a
separate switch box or circuit breaker for dis-
connecting power to the furnace.
Your Y460A Thermostat
❑ Follow these instructions step-by-step for proper
installation of your Honeywell thermostat. It is
recommended that as you read, understand and
complete each step, you check √ it off with a pencil
or pen.
2 UNPACK YOUR THERMOSTAT
❑ Carefully unpack your new thermostat.
❑ Remove and discard the shipping wrap; be sure to
save the screws and the instructions.
❑ Remove the thermostat cover and set it aside to use
later.
1 PREPARE FOR INSTALLATION
❑ Remove the red plastic insert that holds the mercury
❑ Assemble the following required tools:
switch in place.
Flat-bladed screwdriver; hand or power drill with
3/16 in. (4.8 mm) drill bit; wire cutter/stripper or sharp
knife; bubble level or plumb bob and line.
3 REMOVE YOUR OLD
THERMOSTAT
FLAT BLADE
SCREWDRIVER
❑ Remove the cover of the old thermostat. If the cover
does not snap off when pulled firmly from the
bottom, look for screw(s) to loosen to unlock the
cover.
HAND OR POWER
DRILL WITH 1/16 INCH
DRILL BIT, IF NEEDED TO
DRILL HOLES IN WALL
❑ Before removing
the old thermostat
from the wall, look
at it carefully to
BULB
SWITCH
locate the heat
anticipator
adjustment
MASKING TAPE, IF NEEDED
TO LABEL WIRES AS THEY
ARE DISCONNECTED FROM
OLD THERMOSTAT
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED TO STRIP WIRES
ANTICIPATOR
SCALE
mechanism. Look
at the illustration to
help you recognize
the heat
ANTICIPATOR
M6115
SETTING LEVER
SPIRIT LEVEL OR PLUMB BOB AND LINE TO LEVEL
THERMOSTAT FOR ACCURATE OPERATION
M 835
anticipator. Make a
note here ______________ of that anticipator
setting for use in Step 7. The heat anticipator pointer,
if adjustable, will be set at one of a series of numbers
representing the electrical current rating of the
primary control in your furnace: .2, .4, .8, etc or 0.2,
0.4, 0.8, etc. If no heat anticipator/indication is
showing, go on to the next step.
IMPORTANT:
For cooling systems, do not operate cooling if
outdoor temperature is below 50°F (10°C).
❑ Test your heating and/or cooling systems to be sure
they are working, especially if they have been
inoperative for any length of time. If either system
does not work, contact your local heating/air
conditioning dealer for assistance.
❑ Loosen screw(s) holding the thermostat base to the
subbase or wall and lift it away.
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69-1358
THE ROUND® CREATIVE SERIES Y460A2003 THERMOSTAT
6 MOUNT YOUR THERMOSTAT
G
R
H
EXAMPLE: FOR R TO R
C
H
❑ Set the heat anticipator indicator to 1.2 before
mounting to prevent the anticipator from burning out
during installation.
JUMPER, STRIP WIRE
END LONG ENOUGH TO
JOIN BOTH TERMINALS.
R
C
Y
M1277A
W
❑ Firmly tighten the screws.
❑ Push the excess wire back into the wall.
❑ Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat
operation.
SCALE
.12
LONGER
.15
HOLE SUITABLE FOR
PENCIL POINT
TO MOVE INDICATOR
Y460A for heating/cooling system using separate RC-
RH terminals. If old thermostat has single R terminal,
refer to jumper drawing in Subbase Wiring procedure.
HEAT
ANTICIPATOR
INDICATOR
M1368
❑ Align the thermostat over the subbase and tighten
the three captive mounting screws (see Step 4).
These captive mounting screws complete the
electrical connections to the thermostat.
7 SET HEAT ANTICIPATOR
INDICATOR
R
H
G
R
C
❑ Be sure the thermostat adjustable heat anticipator is
set correctly to accurately control the temperature.
An incorrect setting (if too high) can result in wide
room temperature swings or (if too low) burn out the
anticipator, which voids the thermostat warranty.
❑ Make sure you have the current draw (anticipator
setting) for your system. This is the number you
wrote in the box in Step 3. If you were unable to find
the current draw for Step 3, this information can be
found printed on the primary control at the furnace or
boiler. The primary control is usually a gas valve, a
relay or burner control box, Aquastat® Controller or
zone valve with the thermostat wires connected to it.
These controls are usually located behind the
furnace cover; see the illustration.
Y
W
2
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN
RELAY
1
1
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
IN HEATING, THE FAN IS CONTROLLED BY ANOTHER CONTROLLER,
SUCH AS A HONEYWELL L4064 FAN AND LIMIT CONTROLLER OR
FAN TIMER.
M13418
OIL BURNER CONTROL
SHOWS
SHOWS
VOLTAGE
RATING
SHOWS
CURRENT
VOLTAGE
DRAW
30 VAC
RATING
V8043E 1004 4
24V 50/60CY
.32 AMP @ 60CY
0
.2
A
M
P
SHOWS
ANTICIPATOR
SETTING
SHOWS
VOLTAGE
RATING
T
TO
BURNER
T
F
24 Vac 50/60 Hz
0.4 AMP
F
FROM MAIN
SHOWS
FUEL SUPPLY
ANTICIPATOR
SETTING
ZONE VALVE
M6116B
TYPICAL GAS VALVE
❑ If the current rating is still unavailable:
— Remove the W wire from the subbase.
— Connect one probe of an ac ammeter (0 to 2.0A,
for example) to the W wire and connect the other
probe to the W terminal.
3
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THE ROUND® CREATIVE SERIES Y460A2003 THERMOSTAT
— Let the system operate through the ammeter for
9 CHECK OUT THE SYSTEM
at least one minute before taking a reading.
Record the reading here ______________ .
— Reconnect the W wire to the W terminal.
Heating
❑ Turn down the temperature setting to the lowest
point. Move the System switch to Heat. Raise the
temperature setting above room temperature; the
heating equipment should start. Lower the
temperature setting below room temperature; the
heating system should stop.
❑ Move the heat anticipator indicator to match the
number you recorded in Step 3 or in Step 7.
NOTE: Hot water and steam systems require you to
multiply the current rating times 1.3. For elec-
tric heat systems, add the fan relay current,
usually 0.2A to 0.4A.
Cooling
❑ Snap the cover ring over the thermostat dial.
CAUTION
8 SET THE TEMPERATURE
Equipment Damage Hazard.
Can cause permanent damage to the
compressor or other equipment.
To avoid possible compressor damage, allow
the compressor to remain off for five minutes
before restarting.
❑ Turn the transparent dial until the desired point on
the setting scale is aligned with the pointer, as shown
in the illustration.
IMPORTANT:
During a call for heat or cool, an electrical
spark can be seen through the colored
decorator cover ring. Do not be alarmed;
this is normal operation for a mercury
switch.
To avoid possible equipment damage, do not
operate cooling when the outside temperature is
below 50°F (10°C).
See equipment manufacturer instructions.
Set Subbase Switch
CAUTION
Equipment Damage Hazard.
Can cause permanent damage to the
compressor.
Do not rotate the thermostat dial back and forth
just to observe the electrical spark; observe the
compressor five-minute minimal-off period.
CAUTION
Can cause permanent damage to the
Equipment Damage Hazard.
compressor.
Do not rotate the thermostat dial back and forth
just to observe the electrical spark; observe the
compressor five-minute minimal-off period.
❑ Turn up the temperature setting to the highest point.
Move the subbase System switch to Cool. Lower the
temperature setting below the room temperature; the
cooling equipment should start. Raise the tempera-
ture setting above the room temperature; the cooling
system should stop.
❑ To operate the heating system, set the subbase
System switch to Heat. To operate the cooling
system, set the subbase System switch to Cool. Set
it to Off if you want neither heating or cooling.
❑ Set the Fan switch to On for continuous fan
operation or to Auto for fan operation during heating
or cooling cycles.
WARRANTY
TEMPERATURE
SETTING
Honeywell warrants this product, excluding battery, to be free
from defects in the workmanship or materials, under normal
use and service, for a period of one (1) year from the date of
purchase by the consumer. If, at any time during the warranty
period, the product is defective or malfunctions, Honeywell
shall repair or replace it (at Honeywell’s option) within a rea-
sonable period of time.
If the product is defective,
i. return it, with a bill of sale or other dated proof of pur-
chase, to the retailer from which you purchased it, or
ii. package it carefully, along with proof of purchase
(including date of purchase) and a short description of
the malfunction, and mail it, postage prepaid, to the fol-
lowing address:
M13419
THERMOMETER
Honeywell Inc.
Return Goods Department
1050 Berkshire Lane
Plymouth, MN 55441-4437
This warranty does not cover removal or reinstallation costs.
This warranty shall not apply if it is shown by Honeywell that
the defect or malfunction was caused by damage which
occurred while the product was in the possession of a
consumer.
69-1358
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THE ROUND® CREATIVE SERIES Y460A2003 THERMOSTAT
Honeywell’s sole responsibility shall be to repair or replace the
ONE YEAR DURATION OF THIS WARRANTY. Some states
do not allow limitations on how long an implied warranty lasts,
so the above limitation may not apply to you.
product within the terms stated above. HONEYWELL SHALL
NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY
KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL
DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM
ANY BREACH OF ANY WARRANTY, EXPRESS OR
IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT.
Some states do not allow the exclusion or limitation of inciden-
tal or consequential damages, so this limitation may not apply
to you.
This warranty gives you specific legal rights, and you may have
other rights which vary from state to state.
If you have any questions concerning this warranty, please
write our Customer Assistance Center, Honeywell Inc., P.O.
Box 524, Minneapolis, MN 55440-0524 or call 1-800-468-
1502, Monday-Friday, 7:00 a.m. to 5:30 p.m., Central time. In
Canada, write Retail Products ON15-02H, Honeywell Limited/
Honeywell Limitée, 155 Gordon Baker Road, North York,
Ontario M2H 3N7.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY
HONEYWELL MAKES ON THIS PRODUCT. THE DURATION
OF ANY IMPLIED WARRANTIES, INCLUDING THE WAR-
RANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE
5
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Home and Building Control
Honeywell Inc.
Honeywell Plaza
Home and Building Control
Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
P.O. Box 524
Minneapolis, MN 55408-0524
M2H 3N7
69-1358 G.H. 12-99 Printed in Mexico
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