Robertshaw 9820I - Manual (Page 19)

More Detailed Information on the USER SETTINGS.
DIFFERENTIAL SETTINGS
The temperature differential is your comfort level. The differential is the difference from setpoint
before your heating or cooling system will turn on. The 9815i and 9820i models also have 2 nd
stage differential. If the temperature falls below (or above for cooling) the setpoint by the 1 st stage
differential plus the 2 nd stage, the auxiliary heating (or cooling) system will turn on.
The 2 nd stage delay is a timed delay before the second stage will turn on if the setpoint has not
been achieved within that time frame.
HEATING and COOLING LIMITS
To prevent individuals (probably your kids) from adjusting the
thermostat too hot or too cold, you can limit the maximum setting for
the heating and cooling modes. This will help you save on
energy costs.
LANGUAGE SETTING
This screen allows you to choose the displayed language; English or Spanish.
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USER MENU SELECT
SET COOLING LIMIT
LOWEST COOLING 45 °F
SETTING ALLOWED
USER MENU SELECT
SELECT A LANGUAGE
ENGLISH
ESPANOL ˜
USER MENU SELECT
SET HEATING LIMIT
HIGHEST HEATING 90 °F
SETTING ALLOWED
USER MENU SELECT
DIFFERENTIAL SETTING
1ST DIFF 1˚F
2ND DIFF 2˚F
2ND DELAY  20 MIN