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
F° 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
cont’d
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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