Honeywell T4800A Thermostat User Manual

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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.  
GENERAL  
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 ...............................................................................  
Features ..............................................................................  
Specifications ......................................................................  
Ordering Information ...........................................................  
Installation ...........................................................................  
Setting and Checkout..........................................................  
Operation ............................................................................  
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Copyright © 1996 Honeywell Inc.  
• All Rights Reserved  
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8-0151-1  
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T4800A PRECISION ELECTRONIC ELECTRIC HEATING THERMOSTAT  
Accuracy: 1°F (0.5°C) droop average for range of loads.  
Conforms to NEMA DC3 standard applied to low voltage  
SPECIFICATIONS  
thermostats.  
IMPORTANT  
The Specifications given in this publication do not  
include normal manufacturing tolerances. Therefore,  
this unit may not exactly match the listed  
Setpoint Adjustment:  
Control knob on front of thermostat.  
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.  
Sensing Element:  
Electronic thermistor.  
Dimensions:  
See Fig. 1.  
Red LED Indicator:  
Lights as heat comes on.  
®
TRADELINE Models  
Mounting Means:  
Mount directly on vertical 2 x 4 inch outlet box, or on  
TRADELINE® models are selected and packaged to provide  
ease of stocking and handling and also maximum  
replacement value. TRADELINE® model specifications are  
as follows:  
4
x 4 inch outlet box with ring adapter (ordered separately).  
Approvals:  
CSA certified: LR1322.  
Model:  
Underwriters Laboratories Inc. Listed: File No. E47434,  
T4800A makes heating circuit on temperature fall. Single  
pole, single throw. (See Fig. 2.) Range: 40° to 80°F (5° to  
Guide No. XAPX.  
25°C).  
3-1/8 (80)  
1-5/16  
34)  
1-5/16  
(34)  
(
Type of Switching:  
Cool Switch Triac/relay combination.  
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.  
80  
4-3/4  
(120)  
3
-1/4  
(82)  
70  
Electrical Rating:  
60  
Noninductive (resistive) rating:  
50  
2.7A minimum (750W @ 240V; 560W @ 208V) to  
16A maximum (3800W @ 240V; 3300W @ 208V)  
40  
°
F
3/4  
19)  
(
Performance Certification:  
6A at 208 or 240 Vac.  
1
7/8 (23)  
M7102  
Performance Specifications:  
Fig. 1. Nominal dimensions in in. (mm).  
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  
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2
. Model number  
. Voltage.  
If you have additional questions, need further information, or would like to comment on our products or services, please write or  
phone:  
1
2
. Your local Home and Building Control Sales Office (check white pages of your phone directory).  
. 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  
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T4800A PRECISION ELECTRONIC ELECTRIC HEATING THERMOSTAT  
Replacement Applications  
MERCURY NOTICE  
³
Disconnect power to the thermostat to prevent electrical  
shock or equipment damage. All wiring must comply  
with local electrical codes and ordinances.  
If this control is replacing a control that contains  
mercury in a sealed tube, do not place your old  
control in the trash.  
·
»
Remove the old thermostat from the wall, taking care  
not to damage the wiring insulation.  
Check the old wire insulation for cracks, nicks or  
fraying. Apply approved electrical tape to insulate wires  
or replace wires as necessary.  
Contact your local waste management authority for  
instructions regarding recycling and the proper  
disposal of your old control.  
¿
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.  
INSTALLATION  
When Installing this Product…  
1
. Read these instructions carefully. Failure to follow these  
instructions could damage the product or cause a  
hazardous condition.  
´ Prebend and push solid wires into the outlet box.  
² Secure the thermostat on the outlet box by tightening  
the two mounting screws. (Rotate control knob to more  
easily access lower mounting screw.)  
2
3
4
. Check the ratings on the product to make sure the  
product is suitable for your application.  
. Installer must be a trained, experienced service  
technician.  
. After installation is complete, check out product  
operation as provided in these instructions.  
 Snap thermostat cover in place.  
New Applications  
³
Disconnect power to the thermostat to prevent electrical  
shock or equipment damage. All wiring must comply  
with local electrical codes and ordinances.  
·
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.  
Prebend and push solid wires into the outlet box.  
Secure the thermostat on the outlet box by tightening  
the two mounting screws. (Rotate control knob to more  
easily access lower mounting screw.)  
WARNING  
ELECTRICAL SHOCK HAZARD.  
Follow local codes and ordinances when installing this  
thermostat. Improper handling may cause serious  
injury or death.  
HIGH VOLTAGE CONTROL.  
»
¿
CAUTION  
1. Disconnect power supply to prevent electrical  
shock or equipment damage.  
´
Snap thermostat cover in place.  
2
. If connecting with aluminum conductors, use  
CO/ALR solderless wire connectors to avoid fire  
hazard.  
T4800A  
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.  
T1  
L1  
3
BLACK  
BLACK  
Do not install the thermostat where it may be affected by:  
drafts or dead spots behind doors, in corners or under  
cabinets.  
SOLDERLESS  
CONNECTORS  
ELECTRIC  
HEATER  
2
hot air from convectors.  
1
radiant heat from sun or appliances.  
concealed pipes and chimneys.  
unheated (uncooled) areas such as an outside wall  
behind the thermostat.  
L1  
HOT)  
4
(
L2  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
Wiring and Mounting  
2
USE SPECIAL SERVICE CO/ALR SOLDERLESS CONNECTORS  
WHEN CONNECTING ALUMINUM CONDUCTORS OR A FIRE  
HAZARD MAY RESULT.  
CAUTION  
3
4
BREAKS HEATING CIRCUIT ON A TEMPERATURE RISE.  
1
. Handle the thermostat with care to avoid damage.  
2. Use a separate limit control in the heating  
USE A SEPARATE LIMIT CONTROL IN THE HEATING APPLIANCE.  
M7103  
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.  
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68-0151—1  
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T4800A PRECISION ELECTRONIC ELECTRIC HEATING THERMOSTAT  
SETTING AND CHECKOUT  
OPERATION  
IMPORTANT  
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.  
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:  
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.  
³
Turn control knob all the way clockwise  
should light and electric heater should start to warm up.  
Turn knob all the way counterclockwise . LED  
. 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.  
»
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.  
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  
985 Douglas Drive North  
Golden Valley, MN 55422  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Scarborough, Ontario  
M1V 4Z9  
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Printed on recycled paper containing at  
least10% post-consumer paper fibers.  
8-0151—1 C.B. Rev. 4-96 Printed in U.S.A.  

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