Honeywell Y460A2003 Thermostat User Manual

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®
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.  
Remove the red plastic insert that holds the mercury  
switch in place.  
1
PREPARE FOR INSTALLATION  
Assemble the following required tools:  
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  
locate the heat  
anticipator  
BULB  
SWITCH  
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  
adjustment  
mechanism. Look  
at the illustration to  
help you recognize  
the heat  
ANTICIPATOR  
SETTING LEVER  
M6115  
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,  
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.  
0
.4, 0.8, etc. If no heat anticipator/indication is  
showing, go on to the next step.  
Loosen screw(s) holding the thermostat base to the  
subbase or wall and lift it away.  
®
U.S. Registered Trademark  
Copyright © 1999 Honeywell Inc. •  
•All Rights Reserved  
69-1358  
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THE ROUND® CREATIVE SERIES Y460A2003 THERMOSTAT  
Disconnect wires from  
the old thermostat or  
subbase. Wrap the  
wires around a pencil or  
other object, as shown,  
to prevent them from  
falling back into the wall  
opening.  
WIRES THROUGH  
WALL OPENING  
OUTLET BOX  
1
Q539  
SUBBASE  
M5136  
Y460  
NOTE: As you disconnect each wire, use masking  
tape to tape the end and label with the letter of  
the terminal designation to allow easier recon-  
nection to the new subbase.  
THERMOSTAT  
CABLE  
ENTRANCE  
HOLE  
CAPTIVE  
Keep the old thermostat for reference until your new  
thermostat is functioning correctly.  
MOUNTING  
SCREWS (3)  
1
USE Q539 SUBBASE FOR HEAT AND/OR COOL  
APPLICATIONS WITH SWITCHING.  
M13417  
Tighten the screws after using a spirit level or plumb  
line to accurately level the subbase. It must be level  
to maintain accurate calibration.  
RECYCLING NOTICE  
If this control is replacing a control that contains  
mercury in a sealed tube, do not place your old  
control in the trash. Dispose of it properly.  
PLUMB LINE  
MARKERS  
Contact your local waste management authority for  
instructions regarding recycling and the proper disposal  
of the old thermostat. If you have questions, call the  
Honeywell Customer Response Center at 1-800-468-  
MOLDED  
POST (2)  
SPIRIT  
LEVEL  
1
502.  
4
MOUNT THE SUBBASE  
IMPORTANT:  
Install your thermostat about 5 ft (1.5m) above  
OPENING FOR  
THERMOSTAT  
WIRING (PLUG)  
(WITH INSULATION)  
the floor in an area with good air circulation at  
average temperature. Do not install it where it  
may be affected by:  
MOUNTING  
SLOT (3)  
MOUNTING  
HOLE (3)  
drafts, or dead spots behind doors and in  
corners.  
M13415  
hot or cold air from ducts.  
radiant heat from sun or appliances.  
concealed pipes and chimneys.  
unheated (uncooled) areas such as an outside  
wall behind the thermostat.  
5
WIRE THE SUBBASE  
 Follow the instructions provided by the heating or  
heating/cooling equipment manufacturer. If not  
available, refer to the thermostat wiring diagram.  
Bring the thermostat cable through the subbase  
entrance hole.  
Fasten the subbase to the wall or outlet box with the  
mounting screws as shown in the illustration.  
NOTE: All wiring must comply with local electrical  
codes and ordinances.  
1
Wire the Subbase  
Q539  
SUBBASE  
Refer to the illustration to strip the thermostat wire  
insulation from the wire where it connects to the  
terminal, as necessary.  
WALL  
Y460  
Refer to the labels you placed on the wires when you  
removed the old thermostat. Match the letter of your  
old thermostat wire with the corresponding terminal  
letter on your new thermostat.  
THERMOSTAT  
CABLE  
ENTRANCE  
Connect the wires to the matching terminals on the  
subbase. If your old thermostat had an R terminal,  
and your new one has RC and RH terminals,  
connect the old wire R to terminal RH, and add a  
small piece of wire to use as a jumper to connect RC  
to RH. The drawing shows how to jumper RC to RH.  
HOLE  
CAPTIVE  
MOUNTING  
SCREWS (3)  
1
USE Q539 SUBBASE FOR HEAT AND/OR COOL  
APPLICATIONS WITH SWITCHING.  
M13416  
69-1358  
2
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THE ROUND® CREATIVE SERIES Y460A2003 THERMOSTAT  
6
MOUNT YOUR THERMOSTAT  
RH  
G
EXAMPLE: FOR RC TO RH  
JUMPER, STRIP WIRE  
END LONG ENOUGH TO  
JOIN BOTH TERMINALS.  
Set the heat anticipator indicator to 1.2 before  
mounting to prevent the anticipator from burning out  
during installation.  
RC  
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  
.15  
.12  
LONGER  
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.  
R H G  
7 SET HEAT ANTICIPATOR  
INDICATOR  
R
C
Y
 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.  
W
2
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.  
FAN  
HEATING  
RELAY OR  
VALVE COIL  
COOLING  
CONTACTOR  
COIL  
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 VACRATING  
.2  
A
M
V8043E 1004 4  
4V 50/60CY  
32 AMP @ 60CY  
0
2
.
SHOWS  
ANTICIPATOR  
SETTING  
P
SHOWS  
VOLTAGE  
RATING  
T
T
TO  
BURNER  
F
F
2
4 Vac 50/60 Hz  
.4 AMP  
0
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
69-1358  
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THE ROUND® CREATIVE SERIES Y460A2003 THERMOSTAT  
Let the system operate through the ammeter for  
at least one minute before taking a reading.  
Record the reading here ______________ .  
Reconnect the W wire to the W terminal.  
9
CHECK OUT THE SYSTEM  
Heating  
Turn down the temperature setting to the lowest  
Move the heat anticipator indicator to match the  
number you recorded in Step 3 or in Step 7.  
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.  
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  
To avoid possible equipment damage, do not  
operate cooling when the outside temperature is  
below 50°F (10°C).  
spark can be seen through the colored  
decorator cover ring. Do not be alarmed;  
this is normal operation for a mercury  
switch.  
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 Honeywells 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:  
THERMOMETER  
M13419  
Honeywell Inc.  
Return Goods Department  
1
050 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  
4
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THE ROUND® CREATIVE SERIES Y460A2003 THERMOSTAT  
Honeywells 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-  
1
502, Monday-Friday, 7:00 a.m. to 5:30 p.m., Central time. In  
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  
Canada, write Retail Products ON15-02H, Honeywell Limited/  
Honeywell Limitée, 155 Gordon Baker Road, North York,  
Ontario M2H 3N7.  
5
69-1358  
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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  
www.honeywell.com  

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