White Rodgers 1E50N-303 User Manual
Installation Instructions for:
Vertical 1E50N-303
YOUR THERMOSTAT REPLACES
System Models
Standard Heat Only Systems
Electric Furnace
Heat Pump (No Aux or Emergency Heat) 1E50N-303
Gas or Oil Heat
Millivolt Heat Only Systems
PREPARATIONS
1
Assemble tools required : power drill, fl at blade screwdriver, wire cutter/stripper,
level.
Fa ilu re t o fo llo w an d re ad a ll i nst ruc tion s ca refu lly bef ore i nst all ing or o pe rating this control could cause personal injury and/or property damage.
THERMOSTAT FEATURES
2
Mounting
Screw
Captive
screws
70
60
80
50
90
50
60
70
80
90
COVER
Figure 1. Thermostat with subbase or wallplate
THERMOSTAT
BASE
WALLPLATE
SWITCHING
SUBBASE
4
RH
G
W
Mounting
Screw
Mounting
Screw
REMOVING OLD THERMOSTAT (cont’d)
3
If no heat anticipator/indication is showing, do not be concerned; move on to the
next step.
ATTENT ION ! This product does not contain mercury. However, this produc t may
replace a unit which contains mercury.
Do not open mercur y cells. If a cell becomes damaged, do not touch any spilled
mercur y. Wearing non -absorbent gloves, take up the spilled mercur y and place into
a container which can be sealed. If a cell becomes damaged, the unit should be
discarded.
Mercur y must not be discarded in household trash. When the unit this product is
replacing is to be discarded, place in a suitable container and refer to www.whiterodger s.com for location to send product containing mercur y.
MOUNTING AND WIRING
4
WARNING
!
Do not use on circuits exceeding specifi ed voltage. Higher voltage will
damage control and could cause shock or fi re hazard.
Do not short out terminals on gas valve or primary control to test. Short or
incorrect wiring will damage thermostat and could cause personal injury
and/or property damage.
Thermostat installation and all components of the system shall conform to
Class II circuits per the NEC code.
A. Remove base from subbase or wallplate: Loosen the screws on the base and
remove.
B. Mount switching subbase or wallplate: Use the screws provided to mount the
subbase or wallplate to wall (see Fig. 1).
C. Attach wires to appropriate terminals: Two wire systems ( Heat Only). Attach
one wire to RH and one to wire W.
D. Mount Thermostat Base: Gently push excess wire back into the wall opening
and plug hole with a fi re-resistant material, such as fi berglass insulation to prevent drafts from affecting thermostat operation. Mount the thermostat base to
the subbase or wallplate using the three captive screws on the thermostat base.
(See Fig. 1) Tighten the screws securely. Proceed to Step #5.
CAUTION
!
Take care when securing and routing wires so they do not short to adjacent terminals or rear of thermostat. Personal injury and/or property damage may occur.
TERMINAL CROSS REFERENCE CHART
New Thermostat Other Manufacturers’
Terminal Designation Terminal Designation
R H 4 R H M R 5 R
W W W H 4 W
REMOVING OLD THERMOSTAT
3
CAUTION
!
To prevent electrical shock and/or equipment damage, disconnect electrical power to the system at the main fuse or circuit breaker until installation is complete.
Before removing wires from old thermostat’s switching subbase, label each wire
with the terminal designation it was removed from.
1. Remove old thermostat: a standard thermostat consists of three basic parts:
A. The cover, which may be either a snap-on or hinge type.
B. The base, which is removed by loosening all captive screws.
C. The switching subbase, which is removed by unscrewing the mounting
screws that hold it on the wall or adaptor plate.
Make a note here of the anticipator setting on the old thermostat
for future reference and use in step 5.
The heat anticipator pointer, if adjustable, will be set at one of a series of numbers
representing the current rating of the primary control in your furnace. The number
will be one of the following: . 2, .4, .8, Etc. Or 0.2, 0.4, 0.8, Etc.
White-Rodgers is a division
of Emerson Electric Co.
www.white-rodgers.com
SET HEAT ANTICIPATOR
5
Set anticipator to match the setting of your old thermostat you noted in Step 3, or, the
anticipator should be set to match the current rating stamped on your main heating
control. The heat anticipator is adjustable from 0.15 to 1.2 amps. Adjust the anticipator by rotating the contact arm (see fi g. 2). The anticipator setting is indicated by
the numbers on the base that the pointer points to. If you are unsure where to set the
anticipator contact the heater manufacturer for a recommended setting.
Move the pointer counterclockwise to
lengthen heating system cycles; move
clockwise to shorten heating cycles. Ad-
justments should not be greater than 1/ 2
marking at a time.
For millivolt operation, rotate contact arm to
Millivolt Link.
Snap on Cover: Carefully align the cover
with the base and snap the cover onto the
base.
Millivolt Link
Figure 2. Anticipator adjustment
Rotate contact arm
to adjust heat anticipator
Arrow points to the
current rating of
the primary control
PART NO. 37-6973A
0832
NEW THERMOSTAT OPERATION
6
This thermostat is easy to operate. After power is turned on, raise temperature above room temperature to turn the heating system on. Lower temperature below room
temperature to turn heating system off.
SPECIFICATIONS
7
ELECTRICAL DATA
Switch Rating...................................... 24 VAC (30 VAC max.)
Heating.................................................. 0.15 to 1.2 Amps
Anticipator Rating:
Heating.................................................. Adjustable from 0.15 to 1.2 Amps
THERMAL DATA:
Temperature Range............................. 50°F to 90°F (10°C to 32°C)
Operating Humidity Range................. 0 – 90% noncondensing
TROUBLESHOOTING
8
Symptom Possible Cause Corrective Action
No Heat / No Fan
(common problems)
No Heat
Intermittent Heat
Heat or Fan Runs
Constantly.
Furnace Cycles Too
Fast or Too Slow
(Narrow or wide
temperature swing)
Thermostat Setting
and Thermostat
Thermometer Disagree
Adjusting Thermometer
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch to OFF.
3. Furnace blower compartment door or
panel loose or not properly installed.
1. Pilot light not lit.
2. Broken or melted anticipator wire.
3. Loose connection to thermostat or
system.
4. Thermostat or heating system requires
replacement or service.
5. Setpoint temperature below room
temperature.
1. Furnace Lock-Out Condition Many furnaces have safety devices that shut the system down when a lock-out condition
1. Possible short in wiring.
2. Possible short in thermostat.
3. Possible short in heat/cool /fan system.
See Step 5, Adjusting the Anticipator. The anticipation setting is the only adjustment that effects the heating cycle rate. If an
1. Thermostat thermometer setting
requires adjustment.
2. Thermostat setting lever requires
calibration.
1. Thermostat thermometer disagrees
with other room thermometers.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety interlock or door switch.
Re-light pilot.
Excessive current or dead short in system. Have a qualifi ed ser vice person check the system
before replacing thermostat.
Verify thermostat and system wires are securely attached.
Your furnace manufacturer or service person can describe how to test the heating system to
verify it is operating correctly. If the heating system is capable of operation and the no heat
condition persists, replace the thermostat.
Raise temperature above room temperature.
occurs. If the heat works intermittently contact the furnace manufacturer or local service
person for assistance.
Check each wire connection to the thermostat to verify it is neatly looped under the terminals.
No extra wire should stick out from under the terminals.
acceptable cycle rate is not achieved using the anticipator contact a local service person for
additional suggestions. The location of the thermostat, size of the Heat/Cool System and
current draw can infl uence the cycle rate.
The thermometer can be adjusted by using a standard slotted screwdriver. Turn the
thermometer pointer screw located inside the front cover to change the setting. For calibrating
the setting lever contact a local heating and cooling service person.
The thermometer on the thermostat is accurately calibrated at our factory but you can adjust
it by using a standard slotted screwdriver. Turn the thermometer pointer screw located inside
the front cover to change the setting.
Heat
Anticipator
(adjustable)
WR
Heating
System
24 VAC 12 0 VAC
Figure 3. Typical wiring for single transformer heating system
THERMOSTAT
SYSTEM
Hot
Neutral
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
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