Honeywell Y460A2003 User Manual
69-1358
The Round® Creative Series
M6115
BULB
SWITCH
ANTICIPATOR
SCALE
ANTICIPATOR
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.
Your Y460A Thermostat
Follow these instructions step-by-step for proper
❑
installation of your Honeywell t hermostat. It is
recommended that as you read, understa nd and
complete each step, you check √ it off with a pencil
or pen.
1 PREPARE FOR INSTALLATION
Assemble the following required tools:
❑
Flat-bladed screwdrive r; hand or power drill with
3/16 in. (4.8 mm) dril l bit; wi re cutte r/stripper or shar p
knife; bubble level or plumb bob and line.
FLAT BLADE
SCREWDRIVER
WIRE CUTTER/STRIPPER OR SHARP
KNIFE, IF NEEDED TO STRIP WIRES
SPIRIT LEVEL OR PLUMB BOB AND LINE TO LEVEL
THERMOSTAT FOR ACCURATE OPERATION
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.
HAND OR POWER
DRILL WITH 1/16 INCH
DRILL BIT, IF NEEDED TO
DRILL HOLES IN WALL
MASKING TAPE, IF NEEDED
TO LABEL WIRES AS THEY
ARE DISCONNECTED FROM
OLD THERMOSTAT
M 835
IMPORTANT:
Turn off power to the system at the main fuse
or circuit breaker panel. Most buildings have a
separate switch box or circuit br eaker for disconnecting power to the furnace.
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 co ver and set it aside to use
❑
later.
Remove the red plastic insert that holds t he mercury
❑
switch in place.
3 REMOVE YOUR OLD THERMOSTAT
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.
Before removi n g
❑
the old thermostat
from the wall, look
at it carefully to
locate the heat
anticipator
adjustment
mechanism. Look
at the illustration to
help you recognize
the heat
anticipator. Make a
note here ______________ of that anticipator
setting for use in St ep 7. Th e heat ant icipator po inter,
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.
Loosen screw(s) holding the thermost at base to the
❑
subbase or wall and lift it away.
® U.S. Registered Trade m ark
Copyright © 1999 Honeywell Inc. • •All Rights Reserved
THE ROUND® CREATIVE SERIES Y460A2003 THERMOSTAT
Disconnect wires from
❑
the old thermostat
subbase. Wrap the
wires around a pencil or
other object, as shown,
to prevent them from
falling back into the wall
opening.
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 reconnection to the new subbase.
Keep the old thermostat for reference until your new
❑
thermostat is functioning correctly.
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.
Contact your local waste management authority for
instructions regardi ng recy cl ing and th e prop er disp osal
of the old thermostat. If you have questions, call the
Honeywell Customer Response Center at 1-800-468-
1502.
or
WIRES THROUGH
WALL OPENING
M5136
❑
MOLDED
POST (2)
4 MOUNT THE SUBBASE
IMPORTANT:
Install your thermostat about 5 ft (1.5m) a bove
the floor in an area with good air circul ation at
average temperature. Do not instal l i t wher e it
may be affected by:
— drafts, or dead spots behind doors and in
corners.
— hot or cold air from ducts.
— radiant heat from sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) are as s uch as a n outsi de
wall behind the thermostat.
Bring the thermostat cable through the subbase
❑
entrance hole.
Fasten the subbase to the wall or outl et box with the
❑
mounting screws as shown in the illustrat ion.
OPENING FOR
THERMOSTAT
WIRING (PLUG)
(WITH INSULATION)
5 WIRE THE SUBBASE
❑
NOTE: All wiring must comply with local electrical
OUTLET BOX
1
Q539
SUBBASE
Y460
THERMOSTAT
CABLE
CAPTIVE
MOUNTING
USE Q539 SUBBASE FOR HEAT AND/OR COOL
1
APPLICATIONS WITH SWITCHING.
Tighten the screws aft er using a spirit level or plumb
line to accurately level the subbase. It must be level
to maintain accurate calibration.
PLUMB LINE
MARKERS
Follow the instructions provided by the heating or
heating/cooling equipment manufacturer. If not
available, refer to the thermostat wiring diagram.
SCREWS (3)
ENTRANCE
HOLE
MOUNTING
HOLE (3)
M13417
SPIRIT
LEVEL
MOUNTING
SLOT (3)
M13415
codes and ordinances.
1
Q539
SUBBASE
Y460
CAPTIVE
MOUNTING
USE Q539 SUBBASE FOR HEAT AND/OR COOL
1
APPLICATIONS WITH SWITCHING.
69-1358 2
SCREWS (3)
WALL
THERMOSTAT
CABLE
ENTRANCE
HOLE
M13416
Wire the Subbase
Refer to the illustration to str ip the thermostat wire
❑
insulation from the wire where it connects to the
terminal, as necessary.
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.
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 t o c onnect RC
to RH. The drawing shows how to jumper RC to RH.
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