Honeywell Thermostat CT1950 User Manual

5
6
Display MINUTE of the Day  
Change MINUTE of the Day  
CT1950/CT1957  
Chronotherm  
Electronic  
THERMOSTAT PROGRAMMING – TEMPERATURE SETUP 7 Day Mode (factory default setting)  
Step  
Description  
Press This Key  
Display will look like this  
Scroll through to display showing the first  
day of programming [beginning with  
MOnday]  
Programmable  
Line Voltage  
Thermostat  
7
8
Display WAKE time  
Note; Broken line outline indicates flashing characters  
8
Step  
9
Description  
Press This Key  
Display will look like this  
Your CT1950/CT1957 Programmable Electronic Line  
Voltage Thermostat features 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.  
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 WAKE time in 10 minute  
increments  
10  
11  
12  
Display WAKE setpoint temperature  
Depending on local climate, night and day set-  
back of space temperature can save up to 28%  
of the energy used to heat a controlled zone.  
Change WAKE setpoint temperature  
Display LEAVE time.  
Repeat the adjustments suggested in  
steps 9 - 11 for the LEAVE, RETURN and  
SLEEP periods  
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.  
9
COPY FROM – AND COPY TO – ANOTHER DAY  
Step  
Description  
Press This Key  
Display will look like this  
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:  
Select and display the day to be copied,  
e.g. MOnday  
13  
Press key to display COPY FROM  
7 to 27°C [45 to 80°F] in 1° increments. Factory set at 16°C [61°F] .  
SWITCHING:  
14  
15  
16  
Patented CoolSwitch™ thyristor with relay conductor.  
WIRING CONNECTIONS:  
Select and display TUesday program period  
(pressing key will display COPY TO)  
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)  
Finally, press FUNC to enter this  
program.  
SENSING ELEMENT:  
Electronic thermistor.  
2
Repeat process for each day copied  
Broken line outline indicates  
flashing characters  
Note: To exit the programming mode at any time, press  
and hold the PROG key for 3 seconds.  
10  
INSTALLATION  
THERMOSTAT PROGRAMMING – ADDITIONAL FUNCTIONS  
!
WARNING  
To change display  
Press and hold both the PROG and FUNC  
keys. Initially a random 4 digit/letter  
display will occur.  
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.  
FF FF  
17  
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.  
Press PROG key and continue –  
(b” will appear for b model only).  
Do NOT connect to voltage different from device rating.  
36  
18  
!
CAUTION  
Disconnect power supply before making wiring connections to prevent electrical shock or equipment damage.  
Convert to  
°C or °F  
19  
Press PROG key a second time to  
display C°. Use [+] key to change to  
if desired (or F° to C°)  
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)  
Convert 5-1-1  
to 7-day  
Press PROG key a third time to  
display 5 1 1 d; press [+] key to  
change mode to 7-day programming  
(or vice versa)  
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.  
3
20  
11  
PROGRAMMING ADDITIONAL FUNCTIONS cont’d  
WIRING:  
PROGRAMMING: 5-1-1 Day Mode (refer to steps 17-20)  
1. Disconnect power while installing.  
p  
Description  
Press This Key  
Display will look like this  
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.  
Scroll through the displays until the  
screen shows the MOnday to FRiday  
schedule with the WAKE, LEAVE  
RETURN and SLEEP options  
Fig. 1 Wiring  
(A)  
(B)  
1
Power supply. Provide disconnect means  
and overload protection as required.  
2
2
L2  
L2  
BLACK  
Follow the same programming  
proceedure as steps 8–12  
2
Special service CO/ALR solderless  
connections must be used when  
connecting aluminum conductors;  
otherwise, a fire hazard may result.  
1
1
5
L2  
3
L1  
BLACK  
L1  
L1  
L1  
T2  
BLACK  
CT1950B  
3
4
5
Thermostat breaks heating circuit on  
temperature rise.  
CT1950A/  
T1  
T1  
3
CT1957A  
Program SAturday and SUnday  
separately or use the Copy From –  
Copy To feature (steps 13–16)  
4
4
Thermostat is designed to be used with  
appliances equipped with a limit control.  
RED  
RED  
ELECTRIC  
HEATER  
ELECTRIC  
HEATER  
BLACK  
B Model thermostat breaks both sides of  
line with switch in OFF position  
contd  
ine outline indicates flashing characters  
12  
4
WIRING cont’d  
TO INDEFINITELY OVERRIDE A PROGRAM  
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.  
Step  
Description  
Press This Key  
Display will look like this  
Press and release FUNC key to activate  
the HOLD mode.  
Press and hold PROG key to return to  
RUN mode.  
24  
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  
TO TEMPORARILY OVERRIDE A PROGRAM  
25  
CO/ALR solderless connectors.  
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  
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.  
5
13  
THERMOSTAT PROGRAMMING  
INITIAL POWER-UP  
CHECKOUT  
When the thermostat is first powered up (or after 8 hours of continuous power loss), the display will blink for 2 seconds,  
On first power up, the thermostat display will show a self test  
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.  
then undergo a self test, indicated by  
for 15 seconds. Once the display shows 1:00 pm flashing, the internal  
OOE  
status,  
00 E  
display for about 15 seconds, then go  
checkout is complete, and the thermostat is ready to program.  
blank for one second, followed by this display —  
(broken line indicates  
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.  
section is flashing.)  
Table 1 – Initial Factory Schedule for 7-day  
Event  
Time  
Temperature  
21°C (70°F)  
16°C (61°F)  
21°C (70°F)  
16°C (61°F)  
Press and hold the PROG key and the thermostat will return to its former RUN mode.  
TROUBLE SHOOTING  
Display Code  
WAKE  
LEAVE  
RETURN  
SLEEP  
6:00 a.m.  
8:00 a.m.  
6:00 p.m.  
10:00 p.m.  
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.  
Cause  
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.  
Connected load exceeded  
3800W  
OLOAd  
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.  
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.  
Push reset key to clear and reset clock.  
Power failure detected  
06E  
Missing segment or other abnormal display Push reset key to clear and reset clock. If problem persist call Honeywell.  
FACTORY SET PROGRAMMING  
The thermostat is preset with a factory set schedule for 7  
14  
6
CLOCK SETUP  
THERMOSTAT PROGRAMMING  
Step  
Description  
Press This Key  
Display will look like this  
1
Display DAY of the Week  
Automation and Control Solutions  
Honeywell  
1985 Douglas Drive North  
Golden Valley, MN 55422  
Honeywell Limited-Honeywell Limité e  
35 Dynamic Drive  
Scarborough, Ontario  
MIV 4Z9  
2
3
4
Change DAY of the Week  
Display HOUR of the Day  
Change HOUR of the Day  
G.H. 6/02 • © Honeywell Limited  
69-1644EF  
 
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