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HOLD
SET
RUN
DAY/TIME
TEMP PROG
AIR FILTER
TEMPERATURE
HEAT
OFF
COOL
FAN
AUTO
ON
EMER
NEXT
74
F
˚
72
F
˚
5
:
36
P
HEAT
T
U
D
AY
S
ET
R
OOM
FAN
LCD Display Screen
P521U
UP, DOWN and HOLD 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: