Honeywell T8400C1099 Owner's Manual - Page 4

Important

Page 4 highlights

Then set the SYSTEM switch: Cool: Normal setting for months when your home needs cooling (air conditioning). Digital display shows a snowflake when cooling is on. Off: Both heating and cooling are off. Heat: Normal setting for months when your home needs heating. Digital display shows a flame when heating is on. SYSTEM Cool Off Heat SYSTEM SWITCH M14228 IMPORTANT Do not operate the T8400 and T8401 in cooling mode when the outdoor temperature is below 50°F (10°C), or damage to compressor could result. 4 69-1491-1

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69-1491–1
Then set the SYSTEM switch:
Cool:
Normal setting for months when your home
needs cooling (air conditioning). Digital display
shows a snowflake
when cooling is on.
Off:
Both heating and cooling are off.
Heat:
Normal setting for months when your home
needs heating. Digital display shows a flame
when heating is on.
SYSTEM
Cool Off Heat
SYSTEM
SWITCH
M14228
IMPORTANT
Do not operate the T8400 and T8401 in cooling
mode when the outdoor temperature is below
50
°
F (10
°
C), or damage to compressor could
result.