68-0151-1
GENERAL
T4800A Precision Electronic
Electric Heating Thermostat
PRODUCT DATA
FEATURES
• CSA Certified and Performance Certified, Underwriters
Laboratories Inc. Listed. Conforms to NEMA standard
DC3 for thermostat accuracy.
• Rugged, molded thermoplastic mounting base with
captive mounting screws.
• Energy efficient and economical.
•Patented electronic switch requires no leveling.
• High sensitivity, solid-state temperature sensing
element.
• Nonpolarized leadwire connections.
• Adjustment range is 40° to 80°F (5° to 25°C).
• Premier White® finish.
• One-piece decorative cover.
• Red LED status indication.
• Suitable for noninductive rated fan-forced heaters,
radiant cable or convectors.
The T4800A Electric Heating Thermostat provides precise,
accurate line voltage control of resistance-rated heating
equipment. A patented Cool Switch™ design activates the
heating circuit on temperature fall and results in longer life for
the thermostat.
CONTENTS
General ............................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 3
Setting and Checkout .......................................................... 4
Operation ............................................................................ 4
Copyright © 1996 Honeywell Inc. • • All Rights Reserved
T4800A PRECISION ELECTRONIC ELECTRIC HEATING THERMOSTAT
SPECIFICATIONS
IMPORTANT
The Specifications given in this publication do not
include normal manufacturing tolerances. Therefore,
this unit may not exactly match the listed
specifications. Also, this product is tested and
calibrated under closely controlled conditions, and
some minor differences in performance can be
expected if those conditions are changed. For exact
engineering specifications, contact your Honeywell
sales representative.
TRADELINE® Models
TRADELINE® models are selected and packaged to provide
ease of stocking and handling and also maximum
replacement value. TRADELINE® model specifications are
as follows:
Model:
T4800A makes heating circuit on temperature fall. Single
pole, single throw. (See Fig. 2.) Range: 40° to 80°F (5° to
25°C).
Type of Switching:
Cool Switch Triac/relay combination.
Accuracy: 1°F (0.5°C) droop average for range of loads.
Conforms to NEMA DC3 standard applied to low voltage
thermostats.
Setpoint Adjustment:
Control knob on front of thermostat.
Sensing Element:
Electronic thermistor.
Dimensions:
See Fig. 1.
Red LED Indicator:
Lights as heat comes on.
Mounting Means:
Mount directly on vertical 2 x 4 inch outlet box, or on
4 x 4 inch outlet box with ring adapter (ordered separately).
Approvals:
CSA certified: LR1322.
Underwriters Laboratories Inc. Listed: File No. E47434,
Guide No. XAPX.
3-1/8 (80) 1-5/16
(34)
1-5/16
(34)
Wiring Connections:
6 in. (150 mm) stranded copper leadwires, suitable for
connecting to aluminum wiring when approved special
service CO/ALR solderless connectors are used.
Electrical Rating:
Noninductive (resistive) rating:
2.7A minimum (750W @ 240V; 560W @ 208V) to
16A maximum (3800W @ 240V; 3300W @ 208V)
80
70
60
50
40
°F
4-3/4
(120)
3-1/4
(82)
3/4
(19)
Performance Certification:
16A at 208 or 240 Vac.
Performance Specifications:
Fig. 1. Nominal dimensions in in. (mm).
7/8 (23)
M7102
Precision: ±1°F (0.5°C) differential with thermistor time
constant of 10 seconds.
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number or specify
1. Model number
2. Voltage.
If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:
1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. Honeywell Customer Relations
Honeywell, 1885 Douglas Drive North
Golden Valley, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Dr, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
68-0151—1
2
T4800A PRECISION ELECTRONIC ELECTRIC HEATING THERMOSTAT
M7103
L1
(HOT)
L2
L1
T1
1
2
4
3
SOLDERLESS
CONNECTORS
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
USE SPECIAL SERVICE CO/ALR SOLDERLESS CONNECTORS
WHEN CONNECTING ALUMINUM CONDUCTORS OR A FIRE
HAZARD MAY RESULT.
BREAKS HEATING CIRCUIT ON A TEMPERATURE RISE.
USE A SEPARATE LIMIT CONTROL IN THE HEATING APPLIANCE.
1
2
3
4
T4800A
ELECTRIC
HEATER
BLACK
BLACK
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do
not
place your old
control in the trash.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of your old control.
INSTALLATION
When Installing this Product…
1. Read these instructions carefully. Failure to follow these
instructions could damage the product or cause a
hazardous condition.
2. Check the ratings on the product to make sure the
product is suitable for your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
WARNING
HIGH VOLTAGE CONTROL.
ELECTRICAL SHOCK HAZARD.
Follow local codes and ordinances when installing this
thermostat. Improper handling may cause serious
injury or death.
CAUTION
1. Disconnect power supply to prevent electrical
shock or equipment damage.
2. If connecting with aluminum conductors, use
CO/ALR solderless wire connectors to avoid fire
hazard.
Replacement Applications
쐃 Disconnect power to the thermostat to prevent electrical
shock or equipment damage. All wiring must comply
with local electrical codes and ordinances.
쐇 Remove the old thermostat from the wall, taking care
not to damage the wiring insulation.
쐋 Check the old wire insulation for cracks, nicks or
fraying. Apply approved electrical tape to insulate wires
or replace wires as necessary.
쐏 Carefully remove thermostat cover by gently lifting at
top edge with a flathead screwdriver. Using wire
connectors approved for No. 12 wires, make line
voltage connections directly to leadwires on thermostat.
See Fig. 2 for typical wiring connections. Be sure all
wiring connections are tight.
쐄 Prebend and push solid wires into the outlet box.
쐂 Secure the thermostat on the outlet box by tightening
the two mounting screws. (Rotate control knob to more
easily access lower mounting screw.)
쐆 Snap thermostat cover in place.
New Applications
쐃 Disconnect power to the thermostat to prevent electrical
shock or equipment damage. All wiring must comply
with local electrical codes and ordinances.
쐇 Carefully remove thermostat cover by gently lifting at
top edge with a flathead screwdriver. Using wire
connectors approved for No. 12 wires, make line
voltage connections directly to leadwires on thermostat.
See Fig. 2 for typical wiring connections. Be sure all
wiring connections are tight.
쐋 Prebend and push solid wires into the outlet box.
쐏 Secure the thermostat on the outlet box by tightening
the two mounting screws. (Rotate control knob to more
easily access lower mounting screw.)
쐄 Snap thermostat cover in place.
Location
Install a vertical outlet box, which is used to mount the
thermostat on, about 5 ft (1.5m) above the floor in an area
with good air circulation at room temperature.
Do not install the thermostat where it may be affected by:
— drafts or dead spots behind doors, in corners or under
cabinets.
— hot air from convectors.
— radiant heat from sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.
Wiring and Mounting
CAUTION
1. Handle the thermostat with care to avoid damage.
2. Use a separate limit control in the heating
appliance.
3. Do not short 208 or 240 volt supply wires with
thermostat. This will damage the T4800 and void
the warranty.
Fig. 2. Typical wiring connections for T4800A.
3
68-0151—1
T4800A PRECISION ELECTRONIC ELECTRIC HEATING THERMOSTAT
SETTING AND CHECKOUT
IMPORTANT
Make sure that all wiring connections are secure
before beginning checkout.
After the thermostat has been installed and powered up,
simulate normal operation as follows:
쐃 Tu rn control knob all the way clockwise . LED
should light and electric heater should start to warm up.
쐇 Tu rn knob all the way counterclockwise . LED
should go off, the power circuit should be broken and
electric heater should start to cool.
NOTE: The T4800 has a load-responsive time delay
to reduce equipment wear, which makes the
mechanical switching differential appear wider,
the faster the knob is rotated. This time delay
does not affect the thermal operation of the
T4800.
쐋 Allow thermostat to operate for several hours to
determine appropriate temperature setting. Adjust the
setting as necessary, moving the knob only one or two
degrees at a time. The precise temperature control of
the T4800 allows the user to select a lower temperature
setting, which saves energy while maintaining comfort.
OPERATION
The T4800 Thermostat provides precise temperature control
with minimum droop of resistance-rated electric baseboard
heating equipment. The T4800 controls room temperature
within 1°F (0.5°C) for average baseboard heater loads.
Electric heat thermostats are often affected by the heat
generated in the control. Temperature control points may vary
or droop 2° to 4°F (1° to 3°C) depending on the load demand.
Temperature settings are adjusted to offset this. The T4800
provides precise control with minimum droop. This allows
better control of room temperatures from day to night and
season to season while saving energy.
The development of this technology was assisted by the electric power industry of the United States under the sponsorship of
EPRI, the Electric Power Research Institute.
Automation and Control Solutions
Honeywell
1985 Douglas Drive North
Golden Valley, MN 55422
68-0151—1 C.B. Rev. 4-96 Printed in U.S.A.
68-0151—1
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Scarborough, Ontario
M1V 4Z9
Printed on recycled paper containing at
4
least 10% post-consumer paper fibers.
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