Do-it 474053 Original operating instructions

INSTALLATION &
OPERATION GUIDE Model No. 474053
Low Voltage Thermostat
Operator: Save this
booklet for future use!
FAN ON
AUTO COOL OFF HEAT
SYSTEM
90
90
80
70
60
50
80
70
60
50

2
Please read this manual thoroughly before installing or operating
your thermostat.
About Your New Thermostat . . .
You have selected the 474053 low voltage heating/cooling thermo-
stat. The sensitive spiral bimetal temperature sensor is combined
withanadjustableheatinganticipatorandafixedcoolinganticipator
toprovidemaximumcomfort.Yournewthermostatiseasytoinstall
and operate. You only need one regular screwdriver and a level —
all other hardware is included.

3
PRECAUTIONS ......................................................................... 4
SPECIFICATIONS .................................................................... 6
INSTALLING YOUR THERMOSTAT ........................................ 7
Check Thermostat Location
Route Wires to Location
Wire and Attach Thermostat
OPERATING YOUR THERMOSTAT ...................................... 22
MAINTAINING YOUR THERMOSTAT.................................... 24
Adjusting Heat Anticipator
Calibrating Thermostat
In This Guide . . .
Operator: Save this
booklet for future use!

4
If in doubt whether your wiring is millivolt, line, or low voltage, have
the wiring inspected by a qualified heating and air contractor,
electrician, or someone familiar with basic electricity and wiring.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes and
ordinances.
This control is a precision instrument, and should be handled
carefully. Roughhandlingordistortingcomponentscouldcausethe
control to malfunction.
PRECAUTIONS
NOTE

5
To prevent electrical shock and/or equipment damage,
disconnect electrical power to the system, at main fuse or
circuit breaker box, until installation is complete.
Do not short out terminals on gas valve or primary control
to test. Short or incorrect wiring will burn out heat antici-
pator and could cause personal injury and/or property
damage.
Do not use on circuits exceeding 30 volts. Higher voltage
will damage the control and could cause shock or fire
hazard.
CAUTION
!
WARNING
!

6
ELECTRICAL DATA
Switch Rating:
24 VAC (30 VAC max.)
Heating 0.15 to 1.2 amps
Cooling 0 to 1.5 amps
Switch Action:
SPST sealed mercury
switch
Anticipator Rating:
Heating adjustable from
0.15 to 1.2 amps
Cooling fixed 24 VAC
THERMAL DATA
Temperature Range:
Heat 50°F to 90°F (10°C to
32°C)
Differential:
1°F (0.6°C)
SPECIFICATIONS

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INSTALLING YOUR THERMOSTAT
CHECK THERMOSTAT LOCATION
Youshouldinstallyourthermostataboutfivefeet(1.5meters)above
the floor in an area with good air circulation and average tempera-
ture.Normally,youcansimplyreplaceyouroldthermostatwithyour
new one.
However,youmayconsiderchangingthethermostat’slocationifthe
thermostat is affected by:
• drafts or dead air spots behind doors and in corners.
• direct exposure to hot or cold air blowing from ducts.
• direct exposure to sunlight or heat from appliances.
• pipesorchimneyslocatedbehindthewallwherethethermostat
is located.

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• unheatedareasbehindthethermostat,suchasanoutsidewall.
ROUTE WIRES TO LOCATION
1. If you are replacing an old thermostat and the wiring and
locationare satisfactory,useexistingwiring. Ifindoubt,rewire.
2. If you choose a new location or if this is a new installation,
thermostat wire must first be run to the selected location. All
wiring must conform to local and national electrical codes and
ordinances.
3. Probe for obstructions in partition before drilling 1⁄2” hole in wall
at selected location. Take up quarter round (if necessary) and
drilla smallguideholefor sighting(seefig.1). Frombasement,
drill a 3⁄4” hole in partition floor next to guide hole. In houses
without basements, drill 1⁄2” hole through ceiling and into parti-
tion from above.

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Approximately
5 feet from floor
1
⁄
2
” hole for
thermostat wire
Stout cord with 6”
chain attached
Baseboard
strip moulding
1
⁄
4
” guide hole
for sighting
Quarter round
removed
3
⁄
4
” hole in floor of partition
Hooked wire for snagging chain
Figure 1. Routing thermostat wires

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4. Through this hole, drop a light chain or 6” chain attached to a
strong cord. Snag cord in basement with hooked wire. In
houses without basements, drop cord through hole in ceiling
and down partitioning; snag the cord at thermostat location.
5. Attach thermostat wire to cord or chain and pull wire through
hole in wall so that at least 6” of wire protrudes.
WIRE AND ATTACH THERMOSTAT
To prevent electrical shock and/or equipment damage,
disconnect electrical power to system, at main fuse or
circuit breaker box, until installation is complete.
CAUTION
!

11
Thetypicalwiringdiagrams(figs.2through5)showonlytheterminal
identification and wiring hookup. Always refer to wiring instructions
providedby equipment manufacturer forsystem hookup operation.
All wiring must conform to national and local electrical codes and
ordinances.
1. Remove cover from thermostat by gripping the base in one
hand. Use the other hand to pull gently at the top or bottom of
the cover.
2. Carefully remove the shipping protective packing from the
switch.
3. Pull wires through the opening in the thermostat base and
connect wires beneath the terminal screws (see figs. 2
through 6).
NOTE

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4. Push excess wiring back into wall and plug hole with fire-
resistant material (such as fiberglass insulation) to prevent
drafts from affecting thermostat operation.
5. Position thermostat base over hole in wall and mark mounting
hole locations on wall.
6. Drill mounting holes.
7. Fasten base loosely to wall using mounting screws. Place a
level against the top of the thermostat base, adjust until level,
andtightenmountingscrewstosecurebase.Ifholesinwallare
too large and do not allow you to tighten the mounting screws
securely, use plastic screw anchors.
8. Snap the cover on the thermostat base and set temperature
lever to desired setpoint.
9. Turn on electrical power to the system.

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GRH W
Factory-installed jumper
Moveable
yellow
jumper
SUBBASE
Adjustable heating
anticipator
Captive
screws
System
switch
COOL
OFF
HEAT
System
switch
COOL
OFF
HEAT
ON
Fan
switch
AUTO
Figure 2. Typical wiring diagram (see figs. 3, 4, and 5
for typical system/thermostat wiring)
RC O YA* B
Fixed cooling
anticipator
THERMOSTAT
SYSTEM
* Terminal Ais not for field wiring. See
SPECIAL SYSTEM CONFIGURATIONS
section for proper use of terminal A.

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All wiring diagrams are for typical systems only. Always refer to
equipment manufacturer’s instructions for system hookup opera-
tions.
Do not allow wiring to pinch between the subbase and the
wall. Be certain that the pivot post that protrudes from the
rear of the thermostat does not rub the insulation of any
wires.Tightenallscrewssecurely-someserveaselectrical
connections.
Electric Heat Furnaces (Single Transformer Systems Only)
The subbase as shipped may not operate the fan correctly. If both
the heating and cooling system must operate the fan relay, remove
themoveable yellow jumper wire from the Yterminal and connect it
to the Aterminal. The fan should now cycle when the thermostat
calls for either heat or cool.
CAUTION
!

15
GRC
Y
W
B
A
RH
O
RH W B O Y G RC A
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER
Heat
Relay Compressor
Relay Fan Relay
** *
Factory-installed jumper
SYSTEM
THERMOSTAT
WIRING
Figure 3. Typical wiring for single transformer heating/cooling system
KEEP THIS
AREA CLEAR
OF WIRES!
* * *
Terminal energized
in cooling Terminal energized in heating
Factory-installed
red jumper wire
Moveable
yellow jumper wire

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Two-Transformer Systems
If two transformers are used, they MUST be in phase.
Failure to do so will result in personal and/or property
damage.
Heat Pump Applications
ThissubbaseWILLNOTprovidemulti-stageheatingorcooling.For
single stage applications, install a short jumper wire across termi-
nalsWandY.Iftheoldthermostathasaterminalthatiscontinuously
energized, disconnect the wire from the old thermostat’s terminal
and connect it either to the: (1) Bterminal, if the reversing valve is
energized on a call for heat; or to the (2) Oterminal, if the reversing
valve is energized on a call for cool. If the system heats on a call for
cool or vice versa, this wire has been connected to the wrong
terminal.
CAUTION
!

17
GRC
Y
W
B
A
RH
O
THERMOSTAT
WIRING
Figure 4. Typical wiring for two-transformer heating/cooling system
KEEP THIS
AREA CLEAR
OF WIRES!
Moveable
yellow jumper wire
RH W B O Y GA
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER Heat
Relay Compressor
Relay Fan Relay
** *
SYSTEM
* * *
Terminal energized
in cooling Terminal energized in heating
24 VAC 120 VAC
Hot
Neutral
TRANSFORMER
RC
NOTE: Remove factory-
installed jumper between
RC and RH terminals for
this application.

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RH and RC must be jumpered for single transformer heat pump
systems. Special Function Terminals
The Band Oterminals can provide switching for special functions
other than heat pump operation. When the system switch is in the
HEATposition,theBterminalisenergized.Whenthesystemswitch
is in the COOL position, the Oterminal is energized.
NOTE

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GRC
Y
W
B
A
RH
O
THERMOSTAT
WIRING
Figure 5. Typical wiring for single transformer,
single stage heat pump system
KEEP THIS
AREA CLEAR
OF WIRES!
Factory-installed
red jumper wire
Moveable
yellow jumper wire
W BO YG A
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER Compressor
Relay
Fan
Relay
* * *
Factory-intalled jumper
SYSTEM
* * *
Reversing valve
energized in cooling Reversing valve energized in heating
Field-installed
jumper wire
RH
Field-installed jumper
RC

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GRC
Y
W
B
OFF
FAN
AUTO ON SYSTEM COOL HEAT
Mounting Screw KEEP THIS AREA
CLEAR OF WIRES Hole in Wall Mounting Screw
Figure 6. Thermostat subbase
ARH
O