Honeywell PRO TH4000 series Operation Manual | Page 9

Honeywell Thermostats Operation Manual - PRO TH4000 series.
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PRO TH4110D / TH4210D

7

69-1760EFS—01

ENGLISH

M29473

The 

SYSTEM switch can be set to control 

your heating or cooling system, depend-
ing on the season.

• Cool: Cooling system control.
• Off:  All systems are off.
• Heat: Heating system control.
• Em Heat:Emergency&Auxiliary

Heat control. Compressor is locked 
out. (Select models only.)

System switch

Set 

SYSTEM switch to control the 

heating or cooling system.

CAUTION: EQUIPMENT DAMAGE 
HAZARD. 
Donotoperatecooling
system when outdoor temperature 
is below 50°F (10°C).

Also See for Honeywell PRO TH4000 series

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