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507518-02

heat and cool) for five consecutive days using a set of four
unique events per day. The remaining two days can then be
set for a different set of four unique events per day. Both the
consecutive days and the events/temperature are set by the
user.

To Change Consecutive Days...

To alter the five consecutive days, 

press and hold

 the

PROG 

button for three seconds. The five consecutive day

period is then displayed (default is MOnday thru FRiday). To
change to a different 5‐consecutive days, use the up or
down arrow buttons. Any five consecutive-day span may be
selected, for example, in figure 10, Saturday through
Wednesday is defined as the 5-day programming
(Thursday and Friday would constitute the 2-day
programming). Press the 

PROG 

button when finished.

FILTER

MO   TU   WE

   TH   FR 

  SA   SU

Figure 10. Change Consecutive days

To Set Program Events and Temperatures...

Figure 11 gives an example of how the two sets of programs
can be set for a normal workweek and weekend.

In the 5-day bar graph, note how programs 

A

 and 

C

 reflect

the desired warmth while the location IS occupied (72°); 

B

allows less heating while the location is NOT occupied; 

D

reflects a cooler sleeping temperature. The 2-day bar graph
would support day-long occupancy and, because the first
program begins later, a less-demanding time schedule.

5-DAY PROGRAM:

72°

68°

64°

| A |

B

|

C

|

D

|

2-DAY PROGRAM:

72°

68°

64°

| A |

B

|

C

|

D

|

6AM

NOON

6PM

MID

6AM

NIGHT

6AM

NOON

6PM

MID

6AM

NIGHT

Figure 11. 5/2 Day Program Example

NOTE - Pressing 

ENTER 

during the following programming

steps, saves and exits to the HOME screen.

To program events and temperatures, perform the following
steps, once with Cool selected and once with Heat selected.

1. Press either the 

HEAT 

or 

COOL 

button.

2. Press and release 

PROG

. “

AM

 6:00”, period “A”, and the

5 consecutive days are displayed; “

AM

 6” flashes.

3. Use the up or down arrow buttons to select the desired

hour; press 

PROG 

when the desired hour is reached.

4. Use the up or down arrow buttons to select the desired

minute; press 

PROG

.

Summary of Contents for ComfortSense 3000 Series

Page 1: ...ammable 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 ...

Page 2: ...ter and Maintenance Reminders 10 SETTINGS Balance Point 11 Service Indicator 12 Thermostat RESET 12 Removing Installing Thermostat 13 Default Thermostat Settings 13 Technical Specifications 13 General These instructions are intended as a general guide and do not supersede local codes in any way Consult authorities having jurisdiction before installation Check equipment for shipping damage If you f...

Page 3: ...PEN 10 36 72 UC HOLD AM PM ROOM MO FAN AUTO SYSTEM COOL Figure 2 Thermostat Buttons IMPORTANT Do NOT begin pressing buttons until after you read the fol lowing section describing each button A pale blue display backlight illuminates for 30 seconds each time any button is pressed When PROG or DAY TIME is pressed a field begins flashing expecting another input Start making changes within 15 seconds ...

Page 4: ...the current day Day selections are abbreviated as MO TU WE TH FR SA and SU Press DAY TIME 4 The HOME screen reappears confirm day and time are correct This completes day and time setting HEAT Using the Heat Mode Enabling Normal Heat Mode Use the HEAT button to enable or disable heat mode If the thermostat is in OFF or COOL mode pressing the Heat button enables Heat mode This is indicated by HEAT i...

Page 5: ...art of heating 1 Minimum furnace off timer 1 5 minutes only for HG 2 Minimum cycle timer six minutes For example If heating has been on for over six minutes then minimum cycle timer is already fulfilled For HG gas it will restart after 1 5 minutes For HE electric it will restart immediately If the heating has not been on for six minutes it will make up the six minutes during the off time Therefore...

Page 6: ... off If a large cooling demand is present Hi will be displayed in the SYSTEM box shown in figure 7 NOTE If no buttons are pressed during a demand for cooling the equipment must operate for at least four minutes After a demand has been satisfied cooling equipment operation is locked out for five minutes If another cooling demand occurs during this 5 minute interval COOL and the snowflakes will flas...

Page 7: ...porary 2 Hour Hold At any time the program is running from the HOME screen set a temporary 2 hour hold by pressing the up or down arrow buttons until the desired set point is displayed HOLD flashes see figure 9 This overrides the program for 2 hours from the last button press then returns to the program To change occupancy status in temporary hold mode press the ENTER button while HOLD indicator f...

Page 8: ... of how the two sets of programs can be set for a normal workweek and weekend In the 5 day bar graph note how programs A and C reflect the desired warmth while the location IS occupied 72 B allows less heating while the location is NOT occupied D reflects a cooler sleeping temperature The 2 day bar graph would support day long occupancy and because the first program begins later a less demanding t...

Page 9: ...he Fan Operation Use the FAN button to select either continuous fan mode or auto fan mode To change from continuous to auto fan mode or back to continuous press the FAN button Note whether a fan icon in the FAN box is present indicating that the fan is running or not fan not running If continuous fan mode is enabled ON displayed in FAN box see figure 12 the fan will run continuously regardless of ...

Page 10: ...select the desired reminder intervals Table 1 Filter and Maintenance Reminders Buttons to Use Reminder Available Settings and How to Use Settings 1st press then Arrows to scroll selections FILTER Total fan run time expressed in months Off 1 3 6 12 for example if fan runs 12 hours a day 1 month reminder displays in 2 calendar months Settings 2nd press then Arrows to scroll selections MAINT Elapsed ...

Page 11: ...erature sensor used for temperature control Occupied and Unoccupied Modes During permanent hold mode the occupancy output follows the program During two hour hold mode the user can change the occupancy status by pressing the enter button The occupancy status will be changed to occupied OC or Unoccupied UC alternatively by pressing the enter button The occupancy relay is turned on when the user sel...

Page 12: ...elete all programming and settings and therefore should only be used on rare occasions when the the thermostat fails to function as designed and or as programmed Such an instance can occur as a result of a power surge or similar electrical disturbance e g after an electrical storm or power outage The RESET button can be used to recover from this situation Heat Prog Fan Settings Cool Day Time Hold ...

Page 13: ...ngs Mode Heat Permanent Hold Mode Setpoint 70 F or 21 C Fan Auto Filter Reminder OFF Maintenance Reminder OFF Equipment Protection Timers Reset Back to Zero Technical Specifications Thermostat Type Electronic programmable thermostat for non heat pump 2 stage heat 2 stage cool Power Supply Range 18VAC 30VAC 24VAC nominal 50Hz1 or 60Hz 1 When the thermostat is used in 50Hz applications the tolerance...

Page 14: ...Resolution 0 125 F S Measurement Accuracy 1 F S Field Offset via DIP switches to 3 F Sampling Method Tetemperature measurements sampled every two seconds Displayed temperature is the average of the last four measurements Temperature Set Point Range S Setting range 50 F 10 C to 90 F 32 C S Setting resolution 1 F 1 C Smooth Setback Recovery via DIP switch 6 Smooth Setback Recovery SSR affects the wa...

Page 15: ... any furnace activation and the next furnace activation 6 minutes Minimum elapsed time between any compressor activation and the next compressor activation 6 minutes NOTE All protection timers except the compressor OFF timer can be over ridden if a heating or cooling demand is initiated or terminated using the UP DOWN HEAT or COOL buttons Equipment Protection Override Both the minimum compressor O...

Page 16: ...erature set point heat cool and fan mode settings filter reminder status maintenance reminder status and equipment protection timers After 24 hours of power loss programmed settings will be lost and replaced with default settings IMPORTANT Power must be applied for at least six consecutive hours prior to a power loss in order for memory to be retained for the specified time LCD Back Light Activate...

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