Honeywell CT1957, CT1950 User Manual

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ELECTRIC HEATER

CT1950A/

ELECTRIC HEATER

RED

BLACK

CT1950B

BLACK

RED

(A)

(B)

CT1957A

CT1950A/

Display MINUTE of the Day

Your CT1950/CT1957 Programmable Electronic Line Voltage Thermostat fea tures digital temperature

sensing and control for energy efficient precision operation. It will provide the flexibility of 5-1-1 day or 7 day programming and exceptional comfort control of resistance-rated heating equipment.The patented CoolSwitch™ design offers long service life.

Depending on local climate, night and day setback of space temperature can save up to 28% of the energy used to heat a controlled zone.

According to the Electric Power Research Institute, precision temperature control also offers up to 12% energy saving during comfort periods compared with conventional bi-metallic electric heating thermostats.

CT1950/CT1957

Chronotherm

™

Electronic

Programmable

Line Voltage

Thermostat

Contents

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Thermostat Programming. . . . . . . . . . . . . . . . . . . 6

Initial Power-Up . . . . . . . . . . . . . . . . . . . . . . 6

Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Schedule: 7 days . . . . . . . . . . . . . . . . . . . . . 8

5-1-1 days . . . . . . . . . . . . . . . . . . . . . . . . . 12

Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Additional Functions . . . . . . . . . . . . . . . . . . . . . 11

Change Display . . . . . . . . . . . . . . . . . . . . . 11

Temporary Program Override . . . . . . . . . . . 13

Indefinite Program Override . . . . . . . . . . . . 13

Copy Program From One Day to Another . . 10

Checkout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Change MINUTE of the Day

THERMOSTAT PROGRAMMING – TEMPERATURE SETUP 7 Day Mode (factory default setting)

Step

Note; Broken line outline indicates flashing characters

Step

Press This Key Display will look like this

Scroll through to display showing the first day of programming [beginning with MOnday]

Display WAKE time

Change WAKE time in 10 minute increments

Display WAKE setpoint temperature

Change WAKE setpoint temperature

Display LEAVE time. Repeat the adjustments suggested in

steps 9 - 11 for the LEAVE,RETURN and SLEEP periods

Description

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: -20 to +104°F [-30 to +40°C], 5 to 95% RH, non-condensing.

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,NON-INDUCTIVE:

16 A (3800W) maximum,2 A (500W) minimum @ 240V, 60 Hz. (12 ft. of baseboard maximum)

SENSING ELEMENT:

Electronic thermistor.

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 higher-rated over-current protection devices.Some sustained fault conditions can cause product failure.

• 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.

COPY FROM – AND COPY TO – ANOTHER DAY

Step

Note:To exit the programming mode at any time, press

and hold the PROG key for 3 seconds.

THERMOSTAT PROGRAMMING –

Press This Key Display will look like this

ADDITIONAL FUNCTIONS

To change display

Convert to °C or °F

Convert 5-1-1 to 7-day

FF FF

Description

Select and display the day to be copied, e.g. MOnday

Press key to display COPY FROM

Select and display TUesday program period (pressing key will display COPY TO)

Finally,press FUNC to enter this program.

Repeat process for each day copied Broken line outline indicates

flashing characters

Press and hold both the PROG and FUNC keys. Initially a random 4 digit/letter display will occur.

Press PROG key and continue – (“b” will appear for b model only).

Press PROG key a second time to display C°. Use [+] key to change to F° if desired (or F° to C°)

Press PROG key a third time to display “5 1 1 d”; press [+] key to change mode to 7-day programming (or vice versa)

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

1 Power supply.Provide disconnect means

and overload protection as required.

2 Special service CO/ALR solderless

connections must be used when connecting aluminum conductors; otherwise, a fire hazard may result.

3 Thermostat breaks heating circuit on

temperature rise.

4 Thermostat is designed to be used with

appliances equipped with a limit control.

5 B Model thermostat breaks both sides of

line with switch in OFF position

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.

THERMOSTAT PROGRAMMING

Step

Note: Broken line outline indicates flashing characters

ADDITIONAL FUNCTIONS cont’d

: 5-1-1 Day Mode (refer to steps 17-20)

Press This Key Display will look like this

TO INDEFINITELY OVERRIDE A PROGRAM

Step

Press This Key Display will look like this

TO TEMPORARILY OVERRIDE A PROGRAM

Description

Scroll through the displays until the screen shows the MOnday to FRiday schedule with the WAKE, LEAVE RETURN and SLEEP options

Follow the same programming proceedure as steps 8–12

Program SAturday and SUnday separately or use the “Copy From – Copy To” feature (steps 13–16)

cont’d

Description

Press and release FUNC key to activate the HOLD mode. Press and hold PROG key to return to RUN mode.

Press and hold [+] or [-] key until TEMP appears on screen; adjust temperature [+] or [-] as desired.Thermostat will return to normal program status automatically in next period

THERMOSTAT PROGRAMMING

On first power up, the thermostat display will show a self test

00E

status, 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 5-1-1 to 7-day) see instructions on

Additional Functions, p. 11. FACTORY SET PROGRAMMING

The thermostat is preset with a factory set schedule for 7

display for about 15 seconds, then go

THERMOSTAT PROGRAMMING

Step

Press This Key Display will look like this

INITIAL POWER-UP

CLOCK SETUP

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 minutes.

Table 1 – Initial Factory Schedule for 7-day 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.

Description

Display DAYof the Week

Change DAYof the Week

Display HOUR of the Day

Change HOUR of the Day

CHECKOUT

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 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

OLOAd

06E

Connected load exceeded 3800W

Power failure detected

Cause

Missing segment or other abnormal display

Automation and Control Solutions

Honeywell Honeywell Limited-Honeywell Limité e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario

for 15 seconds. Once the display shows 1:00 pm flashing, the internal

OOE

Action

Ensure that total wattage of baseboard connected do not exceed 3800W. A fire hazard exists if wattage exceeds 3800W.Push reset key to clear and reset clock.

Push reset key to clear and reset clock.

Push reset key to clear and reset clock.If problem persist call Honeywell.

MIV 4Z9

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