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ETBACK
HOLD
S
ET
RUN
D
AY/TIME
TEMP PROG
AIR FILTER
T
EMPERATURE
H
EAT
OFF
COOL
F
AN
A
UTO
O
N
EMER
NEXT
HEAT
T
U
D
AY
S
E
T
L
EFT
F
AN
F
ILTER
%
P
LCD Display Screen
P621Uc
UP / DOWN Buttons
Set Slide
Switch
Fan Mode
Switch
System Mode
Switch
The electrical rating for this thermostat is 1.5 Amps per terminal, with a
maximum total combined load of 3.0A for all terminals combined.
COMPATIBLE WITH:
• Most 24-volt heating and cooling systems
• 1 or 2 stage Heat / 1 stage Cool: Gas, Oil or Electric systems
• 1 or 2 stage Heat / 1 stage Cool: Heat Pump systems
• 3-wire hydronic (hot water) zone valves
• Gas Millivolt heaters
NOT COMPATIBLE WITH:
• 120/240 VAC line-voltage systems (without a transformer), ask your LUXPRO
dealer for thermostats to control these systems.
SYSTEM COMPATIBILITY:
3