Robertshaw RS9220 Operation Manual page 16

INSTALLER SETUP MENU
Settings
Select F for Fahrenheit
For C
temperature display or
select C for Celsius display.
12 or 24
Select a 12 or 24 hour clock
Hour Clock setting.
Fan
Select GAS or ELEC depending
Operation
on the type of furnace.
14
Display Adjustment Options Default
Next step
F for Fahrenheit
C for Celsius
Prev step
Next step
Use
select 12 or 24 hour clock.
Prev step
Next step
GAS - GS
or
ELEC - EL
Prev step
F
12
and to
GAS