Carrier 33CS250 01 Thermostat User Manual

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33CS

Commercial

Programmable Thermostat

Owner’s Manual

Part Number 33CS250-01

IMPORTANT: Read entire instructions before pro-

gramming the thermostat.

GENERAL

Carrier’s 7-day, commercial, programmable thermostats

are wall-mounted, low-voltage thermostats which maintain

room temperature by controlling the operation of an HVAC

(

heating, cooling and ventilation) system. Separate heating

and cooling set points and auto-changeover capability allow

occupied and unoccupied programming schedules for en-

ergy savings.

All thermostats allow up to 3 occupied and one unoccu-

pied time/temperature setting to be programmed per

Fig. 1 — Thermostat Display

4-hour period. Each thermostat stores programs for 7 in-

dependent days. Batteries are not required. During power in-

terruption the internal NEVERLOST™ memory stores pro-

grams for an unlimited time.

Thermostat Front Panel Buttons — The thermo-

stat has buttons on the front cover which are used to raise or

lower the desired set point and override the current program.

See Fig. 2.

SET POINT BUTTONS — The UP ARROW and DOWN

ARROW buttons will raise or lower the current desired tem-

perature set point. If the thermostat is in AUTO mode, press-

ing the UPARROW or DOWN ARROW buttons will adjust

both the heating heating and cooling set points. Pressing the

UP ARROW or DOWN ARROW buttons in Cooling mode

will adjust only the cooling set points. Pressing the UPAR-

ROW or DOWN ARROW buttons in Heating mode will ad-

just only the heating set points. The UPARROW and DOWN

ARROW buttons are also used in programming mode.

OVERRIDE BUTTON — The Override button is used to

force the thermostat from Unoccupied mode into the Occu-

pied 1 mode comfort settings. The Override period will be

set at 30 minutes. The thermostat will then return to Unoc-

cupied mode. To increase the amount of time in Override

mode, press the Override button again. Thirty minutes of over-

ride time will be added for each time the Override button is

pressed up to a maximum of 4 hours. After the 4-hour limit

has been reached, press the Override button again to cancel

override mode.

IMPORTANT: The thermostat has a conﬁgurable se-

curity level. If certain functions are not available (chang-

ing set points, changing programming schedules), the

thermostat security level may be conﬁgured to ex-

clude those functions. Call the installer to reconﬁgure

the security level.

CONFIGURATION

Thermostat Display — The thermostat display is lo-

cated in the center of the thermostat. See Fig. 1. The fol-

lowing information can be displayed on the screen:

•

mode (OFF, HEAT, COOL, AUTO, or PROGRAM ON)

fan setting (FAN ON or blank)

override indication

room temperature

desired temperature

service ﬁlter indicator

time of day

day of the week

schedule period (Occupied 1, 2, or 3; or Unoccupied)

setup indicator (programming mode)

lock indicator

While in Override mode, the Override icon and the Oc-

cupied 1 icon will be displayed on the thermostat. The time

of day and the minutes remaining in Override mode will al-

ternate on the thermostat display.

The set points are adjustable with the UP ARROW and

DOWN ARROW keys during Override mode.

start/stop indicator (schedule period program mode)

Heat or Cool Indicator — A Heat or Cool indicator is

located on the bottom left cover of the thermostat. See

Fig. 2. The light will be red if the thermostat is in Heating

mode. The light will be green if the thermostat is in Cooling

mode.

Manufacturer reserves the right to discontinue, or change at any time, speciﬁcations or designs without notice and without incurring obligations.

Book 1 PC 111 Catalog No. 533-318 Printed in U.S.A. Form 33CS-4SO Pg 1 12-97 Replaces: New

Tab 11a 13a

NOTE: If the thermostat is in Occupied mode and the Over-

ride button is pressed, the thermostat will go into Unoccu-

pied mode immediately. The thermostat will remain in Un-

occupied mode until the next Occupied start time.

When the fan is not set to FAN ON (no icon displayed on

thermostat screen), the fan will run during heating and cool-

ing operation only.

MODE BUTTON OPERATION — The Mode button se-

lects the operating mode of the thermostat. If OFF is se-

lected, the thermostat will not enter Heating or Cooling mode.

If HEAT is selected, the thermostat will only enter Heating

mode (if the room temperature is below the heating set point).

If COOL is selected, the thermostat will only enter Cooling

mode (if the room temperature is above the cooling set point).

If AUTO is selected, the thermostat will enter Heating or

Cooling mode based on the room temperature and the heat-

ing and cooling set points. If PROGRAM ON is selected,

the stored schedule is enabled and the thermostat will follow

the Occupied and Unoccupied schedules stored in its memory.

Thermostat Programming Buttons — The ther-

mostat has programming buttons which are used to change

the set points of the thermostat, set the modes, and program

schedules. The programming buttons are accessible from un-

derneath the thermostat cover. To access the programming

buttons, pull on the hinged thermostat cover. See Fig. 3. The

programming buttons are: Mode, Fan, Holiday, Program, and

Set Clock.

Auto-Changeover — When the thermostat mode is set to

AUTO, the thermostat will provide automatic changeover

from Heating to Cooling mode and Cooling to Heating mode

when required. The thermostat will automatically switch to

maintain the desired temperature setting. The thermostat does

not need to be manually changed from heating to cooling or

cooling to heating operation.

HOLIDAY MODE — The Holiday button places the ther-

mostat into Holiday mode. During Holiday mode, the un-

occupied set points are enforced. The number of days the

thermostat will be in Holiday mode can be set.

Fig. 2 — Thermostat Front Panel Buttons

Set Clock — The Set Clock button allows the user to

change the time and day displayed on the thermostat. Press

the Set Clock button to enter Set Time mode. See Fig. 4. The

current time will blink on and off. Press the UP ARROW

and DOWN ARROW buttons until the correct time is shown.

Hold down the buttons to quickly move through the time

display. The AM and PM annunciators will automatically

change. To scroll through by hours only, press and hold down

the fan button while pressing the UP ARROW or DOWN

ARROW buttons. To ensure the schedules are properly fol-

lowed, make sure that AM or PM is correct for the time cho-

sen. When the correct time is shown, press the Mode button

to modify the day of the week. The current day will blink on

and off. Press the UP ARROW and DOWN ARROW but-

tons until the correct day is shown. Press the Set Clock but-

ton again to exit the Set Time mode.

Fig. 3 — Thermostat Programming Buttons

The UP ARROW and DOWN ARROW buttons are used

to scroll through programming set points. The buttons are

also used to answer yes or no.

KEYPAD LOCK — The thermostat has a keypad lockout

feature which will not acknowledge front panel buttons until

the lockout sequence is entered. To disable or lock the key-

pad, press and hold the Override button. While holding down

the Override button, press the UP and DOWN ARROW but-

tons simultaneously. The ‘‘Locked’’’ icon will appear on the

display.

The thermostat is unlocked by performing the same pro-

cedure. Press and hold the Override button. While holding

down the Override button, press the Up and Down Arrow

buttons simultaneously. The ‘‘Locked’’ icon will be re-

moved from the display.

FAN BUTTON OPERATION — The Fan button selects fan

operation. When the fan is set to FAN ON, the fan will run

continuously for improved air circulation.

NOTE: When the thermostat is in Unoccupied mode, the fan

will run only during heating or cooling operation, even if the

fan is set to FAN ON, this is the energy-saving smart fan

feature.

Fig. 4 — Setting the Clock

Programming Thermostat Schedules — Be-

fore programming the thermostat, plan the thermostat daily

schedule. The schedule is divided into 7 days (Monday through

Sunday). Each day can have 2 (Occupied 1, Unoccupied), 3

(

Occupied 1, Occupied 2, Unoccupied), or 4 (Occupied 1,

Occupied 2, Occupied 3, Unoccupied) time periods. Each

occupied time period has a start time, stop time, heating set

point, and cooling set point. The unoccupied time period has

a heating set point and a cooling set point. The unoccupied

time period is active whenever an occupied time period is

not active. Fill in Table 1 on page 5 as an aid to program-

ming the daily schedules.

PROGRAMMING MODE — To program the daily sched-

ules, perform the following procedure:

. Enter programming mode by pressing the Program but-

ton. The Occupied 1 annunciator will appear on the ther-

mostat display. See Fig. 5. Use the UP ARROW and

DOWN ARROW buttons to set the maximum number

of Occupied periods available. The thermostat can be

set to 1, 2, or 3. After the number of Occupied periods

has been selected, press the Mode button.

. The cooling set point for Occupied 1 will be displayed.

Use the UP ARROW and DOWN ARROW buttons to

raise or lower the cooling set point until the desired tem-

perature is shown. The range of acceptable values is 35

to 99 F (1 to 37 C). Press the Mode button to continue.

See Fig. 5.

. The heating set point for Occupied 1 will be displayed.

Use the UP ARROW and DOWN ARROW buttons to

raise or lower the heating set point until the desired tem-

perature is shown. The range of acceptable values is 35

to 99 F (1 to 37 C). Press the Mode button to continue.

See Fig. 5.

Fig. 6 — Start Time Display

1. The Copy command can be used to copy the previous

day’s schedule if the schedules are the same. The copy

command becomes available after all the occupied pe-

riods are programmed in a day. Use the UP ARROW to

change the copy command to YES. Use the DOWNAR-

ROW to change the copy command to NO. Press the

Mode button when the choice has been made. See

Fig. 7.

If NO was selected, the schedule will automatically change

to the next day and the user must enter the occupied and

unoccupied schedules for that day.

NOTE: Occupied 1 schedule heating and cooling set points

are the same for each day. Occupied 2 and 3 set points

may be set to different values for each day of the week.

If YES was selected, the schedule will be copied to the

next day. The schedule copy may be repeated until Sun-

day is reached. The Sunday schedule cannot be copied

to Monday.

2. After all the times and set points for each day have been

entered, press the Program button to ﬁnish entering the

schedule.

Fig. 5 — Setting Occupied 1 Set Points

. The cooling set point for Unoccupied will be displayed.

Use the UP ARROW and DOWN ARROW buttons to

raise or lower the cooling set point until the desired tem-

perature is shown. The range of acceptable values is 35

to 99 F (1 to 37 C) or ‘‘OF’’(no unoccupied cooling).

Press the Mode button to continue.

. The heating set point for Unoccupied will be displayed.

Use the UP ARROW and DOWN ARROW buttons to

raise or lower the heating set point until the desired tem-

perature is shown. The range of acceptable values is 35

to 99 F (1 to 37 C) or ‘‘OF’’ (no unoccupied heating).

Press the Mode button to continue.

. The day of the week will be shown. Use the UP AR-

ROW and DOWN ARROW buttons to change the day

of the week until the desired starting day is shown. Pos-

sible choices are M (Monday) through S (Sunday). Press

the Mode button when the desired day is shown.

NOTE: The thermostat will continue to follow the schedule

until a new one is entered.

•

If only one occupied schedule is selected, the Occupied 2

and 3 schedules are skipped.

If the start time is set later in the day than the stop time,

the program will run from midnight of that day to the stop

time and then from the start time to midnight.

If the same start and stop times are programmed for an

occupancy schedule, the thermostat will be in Occupied

mode for 24 hours.

If one occupied period starts or stops within another oc-

cupied period, the lower numbered schedule has priority.

For example, if schedule Occupied 3 is running for 24 hours

and occupied schedule 2 comes on from 1 to 3 PM, the set

points from Occupied 2 are in effect from 1 to 3 PM.

•

. The Start Time for Occupied 1 will be displayed. Use

the UP ARROW and DOWN ARROW buttons to raise

or lower the time until the desired Start Time is shown.

Press the Mode button to continue. See Fig. 6.

. The Stop Time for Occupied 1 will be displayed. Use

the UP ARROW and DOWN ARROW buttons to raise

or lower the time until the desired Stop Time is shown.

Press the Mode button.

. The On/Off icon will be displayed. Use the UP AR-

ROW to turn the Occupied 1 period ON for this day.

Use the DOWN ARROW to turn the Occupied 1 period

OFF for this day.

OVERRIDING THE SCHEDULE — The schedule can be

overridden during operation by pressing the UP or DOWN

ARROW buttons to change the desired temperature. The ther-

mostat will use the new set point until the next scheduled

time period starts.

0. Repeat Steps 2 through 9 to program the remaining sched-

ule for occupied periods 2 and 3 (if selected in Step 1).

Fig. 7 — Copy Command Display

OPERATION

Electric Heat — When the Electric Heat option in the

advanced set up is set to ON (conﬁgured by installer), the

thermostat will turn on the fan immediately any time there

is a heat demand. This feature should only be used on elec-

tric heating applications. Do not use with gas heat.

The Mode button selects the operating mode of the ther-

mostat. If OFF is selected, the thermostat will not enter Heat-

ing or Cooling mode. If HEAT is selected, the thermostat

will only enter Heating mode (if the room temperature is

below the heating set point). If COOL is selected, the ther-

mostat will only enter Cooling mode (if the room tempera-

ture is above the cooling set point). If AUTO is selected, the

thermostat will enter Heating or Cooling mode based on the

room temperature and the heating and cooling set points. If

PROGRAM ON is selected, the stored schedule is enabled

and the thermostat will follow the Occupied and Unoccu-

pied schedules stored in its memory.

Holiday Mode — When the thermostat is in Holiday mode,

the thermostat will operate under Unoccupied set points. To

conﬁgure and activate the Holiday mode, press the Holiday

button. The ‘‘HOL’’ icon will be displayed along with the

remaining days of Holiday mode operation. Press the UP or

DOWN ARROWS to select the number of days that the holi-

day schedule will be in effect. A value of 0 disables Holiday

mode. The duration can be set from 1 to 99 days. The ther-

mostat will enter Holiday mode on midnight of the next day

after the mode has been activated. Holiday mode will re-

main in effect until midnight of the last conﬁgured day.

Auto-Changeover — When the thermostat mode is set

to AUTO, the thermostat will provide automatic changeover

from Heating to Cooling mode and Cooling to Heating mode

when required. The thermostat will automatically switch to

maintain the desired temperature setting. The thermostat does

not need to be manually changed from heating to cooling or

cooling to heating operation.

If the Holiday mode is in effect, the number of days re-

maining will blink on and off and the ‘‘Unoccupied’’ icon

will be displayed. The Override button will be active during

Holiday mode. The Dry Contact Switch is ignored.

To turn off the Holiday mode before the remaining con-

ﬁgured days have passed, press the Holiday button to enter

into the conﬁguration mode. Press the DOWN ARROW to

set the number of days to zero. Holiday mode will be

disabled.

Two-Stage Operation — The second stage of heat or

cool is turned on when the ﬁrst stage has been on for a mini-

mum of 2 minutes and the temperature differential from the

set point is equal to or greater than the set point plus the

deadband plus 2 degrees.

Dry Contact Switch — A dry contact switch is pro-

vided to allow an external device to force the thermostat into

Occupied 1. When the thermostat is forced into Occupied 1

via the dry contact closure, the Occupied 1 icon will blink

each second.

Clock Backup — In the event of a power loss, the ther-

mostat will keep time for a minimum of 48 hours without

external power or batteries.

Fan Operation — If Fan On is selected, the fan will run

continuously during occupied schedule (except when Mode

is switched to OFF). The fan will be off during unoccupied

schedule except during heating or cooling operation.

If Fan On is not selected, the fan will only operate during

heating or cooling operation.

SOFT START — When multiple thermostats are controlled

by the same external device, a Soft Start option can be used

to stagger the turn on times of the HVAC equipment. This

feature may cause a delay in operation after entering

Occupied 1.

Emergency Heat — Emergency heat is available for heat

pump applications. To turn on emergency heat, press and hold

the Fan button. While holding the Fan button, press the UP

button for 2 seconds. An ‘‘EH’’ will be displayed. During

emergency heat, the fan will operate and the second stage of

heat will be energized (locking out the ﬁrst stage compres-

sor). To exit emergency heat, press and hold the Fan button.

While holding the Fan button, press the UP button for 2 sec-

onds. During emergency heat, only OFF and HEAT modes

are available.

Remote Temperature Sensor — A remote tempera-

ture sensor is available to read the temperature from a space.

If a remote temperature sensor is connected, the thermostat

will ignore the reading of its internal sensor. When the ther-

mostat is using a reading from a remote sensor, the degree

symbol above the temperature reading will blink.

Table 1 — Daily Schedule Planner

SCHEDULE

Occupied 2

DAY

OF THE

WEEK

Occupied 1

Occupied 3

Unoccupied

Start / Stop / Heat / Cool

Heat / Cool

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Sunday

NOTE: The cooling temperature set point must be higher than the heating temperature set point.

Manufacturer reserves the right to discontinue, or change at any time, speciﬁcations or designs without notice and without incurring obligations.

Book 1

PC 111

Catalog No. 533-318

Printed in U.S.A.

Form 33CS-4SO

Pg 8

12-97

Replaces: New

Tab 11a 13a

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