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| CT1950/CT1957 |
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| Chronotherm ™ |
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| Electronic |
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| Programmable |
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| Line Voltage |
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| Thermostat |
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Your CT1950/CT1957 Programmable Electronic Line | Contents |
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Voltage Thermostat features digital temperature |
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| Specifications | . 2 |
sensing and control for energy efficient |
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| Installation | . 3 |
precision operation. It will provide the flexibility |
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| Wiring | . 4 |
of |
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| Thermostat Programming | . 6 |
exceptional comfort control of |
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| Initial | . 6 |
heating equipment.The patented CoolSwitch™ |
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design offers long service life. | Clock | . 7 |
| Schedule: 7 days | . 8 |
Depending on local climate, night and day set- |
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back of space temperature can save up to 28% |
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of the energy used to heat a controlled zone. | Reset | . 6 |
| Additional Functions | 11 |
According to the Electric Power Research |
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| Change Display | 11 |
Institute, precision temperature control also offers |
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up to 12% energy saving during comfort periods | Temporary Program Override | 13 |
compared with conventional | Indefinite Program Override | 13 |
heating thermostats. | Copy Program From One Day to Another . . | 10 |
| Checkout | 14 |
SPECIFICATIONS
MODELS: CT1950A/CT1957A - SPST; Makes heating circuit on temperature fall.
CT1950B - DPST; Makes heating circuit on temperature fall. Breaks both sides of 240 volt line with switch in "OFF" position.
Operating range:
CONTROL RANGE:
7 to 27°C [45 to 80°F] in 1° increments. Factory set at 16°C [61°F] .
SWITCHING:
Patented CoolSwitch™ thyristor with relay conductor.
WIRING CONNECTIONS:
6" [150 mm] stranded copper leadwires suitable for connection to aluminum wiring if approved special service CO/ALR connectors are used.
ELECTRICAL RATINGS,
16 A (3800W) maximum, 2 A (500W) minimum @ 240V, 60 Hz. (12 ft. of baseboard maximum)
SENSING ELEMENT:
Electronic thermistor.
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5 |
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| Display MINUTE of the Day |
6 |
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| Change MINUTE of the Day |
THERMOSTAT PROGRAMMING – TEMPERATURE SETUP 7 Day Mode (factory default setting) | |||
Step | Press This Key | Display will look like this | Description |
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| Scroll through to display showing the first |
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| day of programming [beginning with |
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| MOnday] | |
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8 |
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| Display WAKE time |
Note; Broken line outline indicates flashing characters | 8 |
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Step | Press This Key | Display will look like this | Description |
9 |
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| Change WAKE time in 10 minute |
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| increments | |
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10 |
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| Display WAKE setpoint temperature |
11 |
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| Change WAKE setpoint temperature |
12 |
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| Display LEAVE time. |
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| Repeat the adjustments suggested in | |
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| steps 9 - 11 for the LEAVE, RETURN and |
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| SLEEP periods |
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COPY FROM – AND COPY TO – ANOTHER DAY |
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Step | Press This Key | Display will look like this | Description |
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| Select and display the day to be copied, |
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| e.g. MOnday |
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| Press key to display COPY FROM |
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15 |
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| Select and display TUesday program period |
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| (pressing key will display COPY TO) | |
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| Finally, press FUNC to enter this |
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| program. |
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| Repeat process for each day copied |
Note: To exit the programming mode at any time, press | 10 | Broken line outline indicates |
and hold the PROG key for 3 seconds. | flashing characters |
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INSTALLATION
!WARNING
•This thermostat is a line voltage (240 Vac) control. Do not install it unless you are completely familiar and competent with house wiring. If improperly handled, there can be a risk of 240 Volt electric shock hazard which may cause serious injury or death.
•The CT1950/CT1957 is rated for normal full load current on a dual residential 20 A circuit breaker or fuse block. Do not use on circuits protected by
•Do NOT connect to voltage different from device rating.
!CAUTION
•Disconnect power supply before making wiring connections to prevent electrical shock or equipment damage.
•All wiring must comply with applicable codes and ordinances.
•Thermostats are designed to be used with appliances having a limit control.
•Maximum load for thermostat must not exceed 3800W, otherwise a potential fire hazard exists. (ie. greater than 12 ft. of baseboard)
LOCATION:
Install a vertical switch box for mounting the CT1950/CT1957 approximately 1.5 m (5 ft.) above the floor on an inside wall where the thermo stat will be subjected to average room temperature. The thermostat must be placed away from concealed warm or cold water pipes,
air ducts, or drafts from hallways, fireplaces or stairways to sense temperature properly. Do not place thermostat above heater.
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THERMOSTAT PROGRAMMING – ADDITIONAL FUNCTIONS
To change display | FF | FF | Press and hold both the PROG and FUNC |
17 | keys. Initially a random 4 digit/letter | ||
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| display will occur. | |
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| 36 | Press PROG key and continue – |
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| (“b” will appear for b model only). | |
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Convert to |
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| Press PROG key a second time to |
°C or °F |
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| display C°. Use [+] key to change to |
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| F° if desired (or F° to C°) | |
Convert |
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| Press PROG key a third time to |
to |
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| display “5 1 1 d”; press [+] key to |
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| change mode to |
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| (or vice versa) | |
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PROGRAMMING ADDITIONAL FUNCTIONS cont’d |
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WIRING:
1. Disconnect power while installing.
Double check that thermostat is rated for voltage and amperage of load to be controlled.
2. Remove cover as needed by carefully prying at the top or bottom edge with a coin or slot screwdriver.
Fig. 1 Wiring |
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1 | Power supply. Provide disconnect means | (A) |
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| (B) |
| and overload protection as required. | L2 |
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| 2 | L2 |
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2 | Special service CO/ALR solderless |
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| connections must be used when | 1 |
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| connecting aluminum conductors; |
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| L1 |
| otherwise, a fire hazard may result. |
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| L1 |
| L1 |
| BLACK | |
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| BLACK |
| CT1950B | ||
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3 | Thermostat breaks heating circuit on | CT1950A/ |
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| temperature rise. | T 1 | |
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| CT1957A | 4 |
4 | Thermostat is designed to be used with |
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| appliances equipped with a limit control. |
| ELECTRIC |
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| BLACK | |
5 | B Model thermostat breaks both sides of |
| HEATER |
| line with switch in OFF position |
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4
2
BLACK
5L2
L1
T2
3T 1
RED RED
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ELECTRIC HEATER
PROGRAMMING: |
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Press This Key | Display will look like this | Description |
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| Scroll through the displays until the |
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| screen shows the MOnday to FRiday |
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| schedule with the WAKE, LEAVE |
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| RETURN and SLEEP options |
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| Follow the same programming |
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| proceedure as steps |
Program SAturday and SUnday separately or use the “Copy From – Copy To” feature (steps
cont’d
line outline indicates flashing characters | 12 |
WIRING cont’d
3.When replacing an old line voltage wall thermostat, remove it carefully to avoid damage to the insulation on the wiring. Check the old insulation for cracks, nicks, or fraying and apply certified electrical tape where necessary to achieve adequate insulation, or replace the wires in an approved fashion.
4.Attach wires with solderless wire connectors approved for the size and number of wires to be connected. Be sure that all wire connectors are tight.
CAUTION: Do not short 240 V supply wires with thermostat connected. This will damage the CT1950/CT1957 and void the warranty.
!WARNING: To avoid risk of fire hazard, all connections to aluminum conductors must be made using approved CO/ALR solderless connectors.
5.Secure thermostat to the electrical box with captive mounting screws. Installation Hint: Prebend the solid conductors, then push them and the wire connectors into the electrical box before tightening the mounting screws.
6.Snap cover in place.
7.Turn power on.
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TO INDEFINITELY OVERRIDE A PROGRAM
Step | Press This Key | Display will look like this | Description |
24 |
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| Press and release FUNC key to activate |
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| the HOLD mode. | |
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| Press and hold PROG key to return to |
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| RUN mode. |
TO TEMPORARILY OVERRIDE A PROGRAM
| Press and hold [+] or |
25 | appears on screen; adjust temperature [+] or |
program status automatically in next period
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THERMOSTAT PROGRAMMING INITIAL POWER-UP
CHECKOUT
On first power up, the thermostat display will show a self test
status, 00 Edisplay for about 15 seconds, then go blank for one second, followed by this display —
(broken line indicates section is flashing.)
The thermostat will begin temperature control with the default setpoint at 61°F
(16°C) in the HOLD mode. It will continue to operate in this manner until the user presses PROG and proceeds to set the clock (Step 1) below.
Note: To Change display or functions (e.g. to °C or °F, or programming from
FACTORY SET PROGRAMMING
The thermostat is preset with a factory set schedule for 7
days (see Table 1 below). After the clock is set up, if the factory set schedule is satisfactory, no more programming is required. The thermostat will revert to normal RUN mode either by pressing and holding the PROG key for 3 seconds, or left untouched for 5 min- utes.
Table 1 – Initial Factory Schedule for |
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Event | Time | Temperature |
WAKE | 6:00 a.m. | 21°C (70°F) |
LEAVE | 8:00 a.m. | 16°C (61°F) |
RETURN | 6:00 p.m. | 21°C (70°F) |
SLEEP | 10:00 p.m. | 16°C (61°F) |
THERMOSTAT RESET The reset key is accessed by inserting a bent paperclip or similar wire into the small hole next to the [+] key (with cover removed). This will reset the clock only, programmed schedule will be retained.
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When the thermostat is first powered up (or after 8 hours of continuous power loss), the display will blink for 2 seconds, then undergo a self test, indicated by OOE for 15 seconds. Once the display shows 1:00 pm flashing, the internal checkout is complete, and the thermostat is ready to program.
To verify the thermostat is turning on the baseboard heater, repeatedly press the [+] key until the displayed setpoint exceeds the room temperature. The [°] symbol should be flashing. Feel near the baseboard heating element and the unit should be starting to generate heat.
Press and hold the PROG key and the thermostat will return to its former RUN mode.
TROUBLE SHOOTING
Display Code | Cause | Action |
OLOAd | Connected load exceeded | Ensure that total wattage of baseboard connected do not exceed 3800W. |
3800W | A fire hazard exists if wattage exceeds 3800W. Push reset key to clear | |
| and reset clock. | |
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06E | Power failure detected | Push reset key to clear and reset clock. |
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Missing segment or other abnormal display | Push reset key to clear and reset clock. If problem persist call Honeywell. | |
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THERMOSTAT PROGRAMMING CLOCK SETUP
Step | Press This Key | Display will look like this | Description |
1 |
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| Display DAY of the Week |
2 |
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| Change DAY of the Week |
3 |
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| Display HOUR of the Day |
4 |
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| Change HOUR of the Day |
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Automation and Control Solutions
Honeywell | Honeywell |
1985 Douglas Drive North | 35 Dynamic Drive |
Golden Valley, MN 55422 | Scarborough, Ontario |
| MIV 4Z9 |
G.H. • 6/02 • © Honeywell Limited |