Robertshaw 9920i User Manual download pdf (Page 13)

Changing INSTALLER Settings

The INSTALLER SETTINGS are selected based on the type of equipment you have in your facility. This feature should be set only by

a certified HVAC technician. Changing these settings could result in higher energy costs and may even damage the equipment. You

should only change the FILTER MONITOR length should you get a new type of filter.

Energy Efficient Recovery™ (EER™)

Energy Efficient Recovery™ is an energy saving feature. During a set back period (or set up in cooling), it allows the thermostat to

look up to two hours ahead to determine when to turn on the heating (cooling) system. During this time period, the second stage is

locked out to allow the first (and most efficient stage) to bring your facility to the desired temperature.

Indoor Sensor

The remote indoor sensor (part #9020i) can be used to improve the comfort of your home. When used in conjunction with the local

sensor on the thermostat, the two sensors average the sensed temperature and control to that average temperature.

You also can use the remote sensor in a stand-alone situation when you want to control the temperature in a remote area but have the

thermostat in a secure location.

Outdoor Sensor

The remote outdoor sensor (part #9025i) can be used to aid in the comfort of your facility or simply as a sensing device to inquire

about outdoor conditions. In most applications, the thermostat will have a display of the temperature sensed by the remote outdoor

sensor. With a heat pump system, the remote outdoor sensor can help determine when to turn on the second stage of heating for opti-

mal comfort. The remote outdoor sensor should be installed on the northern wall of the facility, away from direct sunlight or other heat

sources that may affect its sensitivity.

SERVICE MONITOR MENU

Two menus are available for the 9920i, the Service Monitor and the Filter Monitor. Three menus are

available for the 9901i and the 9915i, the Cool Monitor, the Heat Monitor and the Filter Monitor. All

can be set based on the HVAC system run time or the calendar. See Reminder Interval.

All selections can be set from OFF to 360 days in 30 day increments or OFF to 980 in 20 hour increments.

REMINDER INTERVAL

The Reminder Interval can be set for either HVAC system run time or based on the calendar.

If Run Time is chosen, the service reminder will be set in hours. After the HVAC system has been

operating for the selected number of hours, a Service Reminder will be displayed informing you that

service is suggested for your system.

If Calendar Time is chosen, the service reminders will be set in days. After the selected number of

days has passed, a Service Reminder will be displayed informing you that service is suggested for

your system.

TEMPERATURE OFFSET

The last unique feature is the OFFSET or calibration feature. This allows the installer to recalibrate

the thermostat if the displayed room temperature is not the actual room temperature. The OFFSET

feature also allows you to display a temperature that is different from the actual room temperature.

SHORT CYCLE PROTECTION

You can change or remove the timed delay that protects the compressor in an air conditioner or

heat pump system. Short Cycle Protection should be turned off ONLY if the HVAC system has other

protective circuits that guarantee a compressor off time. This feature is adjustable from OFF to 5

minutes in 1-minute increments.

INSTALL MENU

SELECT

SERVICE MONITOR MENU

COOL MONITOR 980

HEAT MONITOR 980

FILTER MONITOR 980

INSTALL MENU

SELECT

REMINDER PERIOD

RUN TIME

CALENDAR TIME

INSTALL MENU

SELECT

TEMPERATURE OFFSET

+3.0 ˚F

INSTALL MENU

SELECT

SHORT CYCLE

PROTECTION

4 MINUTES

1 2 ... 8 9 10 11 12 13 14 15

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Robertshaw 9920i User Manual Page 13

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