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Lennox ComfortSense 3000 Series User Manual

Lennox ComfortSense 3000 Series
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E2017 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury
or loss of life. Installation and service must be performed
by a qualified installer, service agency or the gas supplier
OPERATION MANUAL
C0STAT05FF1L CS3000
Commercial Programmable
Thermostat
CONTROLS
507518-02
5/2017
Supersedes 507518-01
C0STAT05FF1L 5/2 Day Programmable
Thermostat
The Lennox ComfortSense
®
3000 Series Commercial
Programmable Thermostat, Model C0STAT05FF1L
(11Y05) is a 5/2 day programmable and 2-heat / 2-cool
electronic thermostat. It includes a programmable filter
change reminder, an equipment maintenance reminder,
and a system check indicator to notify the user when the
equipment requires service.
This thermostat is suitable for 2‐stage heat / 2‐stage cool
applications using a gas or electric auxiliary heat source and
can also be used with an economizer.

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Lennox ComfortSense 3000 Series Specifications

General IconGeneral
Display TypeLCD
Wi-Fi CapabilityNo
ProgrammableYes
TouchscreenNo
Backup BatteryYes
Humidity ControlNo
Air Filter MonitorNo
Temperature Range45°F to 99°F
Power Source24 VAC
Programmability7-day programmable
Fan ControlAuto/On
CompatibilityConventional and Heat Pump Systems
System SwitchHeat, Cool, Off, Auto

Summary

General

Installation and Safety Guidelines

General installation instructions and safety guidelines for the thermostat.

Initial Thermostat Power-up Display

Description of the thermostat display when power is initially applied.

Buttons, Backlight, Timers & Settings

Thermostat Buttons and Backlight

Details the location and function of thermostat buttons and the display backlight.

Important Notes on Button Operation

Important information regarding button presses, field flashing, and screen return.

DAY/TIME - Setting the Day and Time

Setting the Day and Time

Instructions for setting the current day, hour, and minute on the thermostat.

HEAT - Using the Heat Mode

Enabling and Disabling Heat Mode

How to enable or disable heat mode, indicated by system box status.

COOL - Using the Cool Mode

Enabling and Disabling Cool Mode

How to enable or disable cool mode, indicated by system box status.

HOLD - Using Temperature Hold Modes

Adjusting Temperature Setpoint in Hold Mode

How to adjust the temperature setpoint while in hold mode using arrow buttons.

Cooling Demand

Cooling Demand Detection

How the thermostat detects and responds to cooling demand.

Permanent Hold Mode

Permanent Hold Mode Operation

How to set a permanent hold, overriding the program schedule.

Temporary (2-Hour) Hold

Temporary (2-Hour) Hold Operation

How to set a temporary hold for 2 hours, overriding the program schedule.

PROG - Thermostat Programming

Changing Consecutive Day Span

How to alter the default 5-day consecutive period for programming.

Setting Program Events and Temperatures

Steps to program events and temperatures for heat or cool cycles.

FAN - Controlling Fan Operation

Selecting Fan Modes

How to select between continuous fan mode and auto fan mode.

SETTINGS - Filter/Maintenance Reminders

Configuring Filter Reminders

How to set up reminders for filter changes based on fan run time.

Configuring Maintenance Reminders

How to set up reminders for routine checks based on chronological time.

Occupied and Unoccupied Modes

Managing Occupancy Status

How to change occupancy status between occupied (OC) and unoccupied (UC).

Service Indicator

Interpreting the Service Indicator

When the 'SERVICE' indicator flashes, indicating a need for qualified service.

Thermostat RESET

Resetting the Thermostat to Defaults

How to perform a reset to restore default settings and clear programming.

Removing/Installing Thermostat

Thermostat Removal Process

Instructions for safely removing the thermostat from its wall bracket.

Thermostat Installation Process

Instructions for safely installing the thermostat onto its wall bracket.

Default Thermostat Settings

Reviewing Default Settings

Table listing the thermostat's default configuration settings.

Technical Specifications

Thermostat Type and Power Supply

Specifications for thermostat type, power supply range, and operating conditions.

Temperature Display Specifications

Details on display scale, range, resolution, and accuracy.

Setting Temperature Scale

Switching Between Fahrenheit and Celsius

How to select either Fahrenheit or Celsius for temperature display.

Selecting Internal or Remote Sensor

Configuring Temperature Sensor Input

How to select between internal and external remote temperature sensors.

Temperature Measurement Range

Temperature Measurement Details

Details on measurement scale, range, resolution, accuracy, and sampling.

Temperature Set Point Range

Setpoint Adjustment Range

Specifications for the settable temperature range and resolution.

Smooth Setback Recovery

Understanding Setback Recovery

How the thermostat's response to program events is affected by SSR.

Fan Control

Fan Control Modes

Specifies available fan control modes: AUTO or ON.

I/O Relays

I/O Relay Functionality

Information on the latching type of thermostat relays for power saving.

Table 4. Terminal Designations

Terminal Designations Overview

Table detailing terminal designations and their descriptions.

Equipment Protection Timers

Minimum Compressor Timers

Details on minimum compressor off and on times.

Minimum Electric Heat Timers

Details on minimum electric heat on time.

Minimum Furnace Timers

Details on minimum furnace on and off times.

Minimum Cycle Time

Information on minimum cycle time between furnace activations.

Equipment Protection Override

Overriding Protection Timers

How to override minimum compressor OFF and equipment cycle timers.

Filter Reminder Settings

Configurable Filter Reminder Intervals

Available settings for filter reminders based on fan run time.

Maintenance Reminder Settings

Configurable Maintenance Reminder Intervals

Available settings for maintenance reminders based on chronological time.

Service Reminder

Conditions for Service Indicator Display

Conditions under which the SERVICE indicator will be displayed.

Power Loss/Recovery

Thermostat Memory Retention

How thermostat memory is retained during power loss and recovery.

LCD Back Light

LCD Backlight Operation

Details on how the LCD backlight activates and its duration.

Thermostat Operating Conditions

Operating and Storage Environment

Specifications for thermostat operating and storage temperature and humidity.

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