ELRO KT 250 User manual

MANUAL
BATTERY
EXCLUSIVE
2 X AAA
ALKALINE
INDOOR
MO-TU-WE-TH-FR
4 SETTINGS
SATURDAY
2 SETTINGS
SUNDAY
2 SETTINGS
GUARANTEE
2 YEAR
5°
35°
MAXIMUM
MINIMUM
MANUAL
OVERIDE
250 VOLT
5(3) AMP
ON-OFF
SWITCH
22 °C
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GB

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TABLE OF CONTENT
1 INTRODUCTION………………………..………… 2
2 INSTALLATION……………………………………. 4
3 SETTING CLOCK …………………………………. 11
4 SETTING PROGRAM……………………………... 12
5 MANUAL OVERRIDE …………………………...… 15
6 HEATER OPERATION…………………………….. 17
7 LOW BATTERY OPERATION…………….………. 18
8 SPECIFICATIONS…………………………………. 19
1 INTRODUCTION
This thermostat can replace most common indoor residential
thermostat and is designed to be used with electric, gas or oil
heating system.
1.1 Outlook
Sensor positionr
Screen
up/down Battery door
button
on/of f Reset
switch
22 °C
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1.3 Features
Several useful functions and operating modes have been
incorporated to adapt a variety of customer needs.
- LCD shows the “NEED TO KNOW” information only, which is
more easy to understand
- 8 Changeable Programs (4 programs for weekday; 2 programs
each for Saturday and Sunday)
- Real Time Clock with Day of Week Display
- Room Temperature Display
- Simplified Temperature Adjustment
- Simplified Programming Procedure
- Manual Set-Temperature Override
- 2 x AAA Size Alkaline Batteries Operation (Not Included)
- Low Battery Indication
- Heater Operation Mode
- On /Off Switch
- Slim Housing Design
1.2 LCD
day of week
indicator
battery low
icon
time
heater on icon
program temperature
number
manual override icon
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0:00
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2 INSTALLATION
This thermostat has been designed for simple and quick
installation requiring only a few tools.
CAUTION:
1. The appliance can only be mounted on dry indoor places.
2. A suitable fuse with rating not exceeding 5A, should be in the
power line.
3. Observe the national regulation for the wiring.
4. Qualified electrician is recommended for installation and
servicing.
2.1 Required Material
Hammer
Masking tape
Drill and 3/16” drill bit
Screwdriver
2.2 Removing your old thermostat
CAUTION: To avoid electric shock, turn off the power of the
heating system at the main power box in your home. Read the
following instructions carefully before disconnecting the wires.
1. Turn off the old thermostat.
2. Remove the cover from the old thermostat.
3. Unscrew the old thermostat from the wall plate.
4. Find and remove the screws attaching the wall plate to the wall.
Pull the wall plate a small distance from the wall. Do not
disconnect any wire yet, simply locate the wires.
Warning: After removing the wall plate, if you find that it is
mounted on a junction box (e.g. a box similar to one behind a
light switch or electric outlet), high voltage circuit may be
present and there is a danger of electric shock. Please consult a
qualified electrician.
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2.3 Wire Labeling
1. Disconnect and identify each wire.
2. Tape the wires to the wall to keep them from slipping through
the hole in the wall. If the hole in the wall is larger than
necessary, fill it in order to prevent hot or cold air to penetrate
the thermostat. In this manner, the thermostat will function
perfectly.
2.4 Choosing a Location
For a new installation, choose a mounting location:
1. About 5 feet (1.5 meter) above the floor in an area with good
air circulation.
2. Away from:
l. Drafts of dead air sports
ll. Air ducts
lll. Radiant heat from the sun or appliances
lV. Concealed pipes and chimneys
3. The best viewing angle is 12 o'clock direction.
2.5 Mounting
1. Mounting the thermostat onto the wall.
2. Remove completely the front housing of the
thermostat by using a screwdriver. (see picture)
3. Mark the holes' position and align the wire coming from the
wall in the hole beside the connectors. (see picture)
4. rill two holes and insert the plastic anchors carefully into the
holes until they are flush with the wall.
5. Fasten securely the thermostat to the wall with the two screws.
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2.6 Connecting the Wires
1. Connect the system wires to the terminals according to the
wiring diagram shown in the section 2.7 “WIRING DIAGRAM”.
2.7 Wiring Diagram
The T103 thermostat can be used with single stage heating
system. Inside the thermostat, three terminals which label COM,
NC and NO would be found. In most case, COM and NO are
used.
2.8 Battery Installation
The KT250 is operated by two AAA 1.5V Alkaline batteries. Please
follow the installation instruction:
1. Find out the battery door at the side of the case.
2. Slide the door downward to open it.
3. Two old batteries would “jump out”.
4. Take out the old batteries.
5. Insert two batteries in right position as shown. Be sure the
polarity of the batteries are in right position.
6. Push and slide the door upward to close it.
If first use, skips the instruction (3) and (4).
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2.9 Temperature Span
Span is the temperature difference between the turn ON and OFF
temperature. The factory pre-set span is 1°C. For example, control
temperature setting is 20.0°C. The heater will be operated when
the room temperature drops to 19.5°C and will be turned off when
the temperature rises to 20.5°C.
2.10 Temperature Measurement
'HI' will be shown when temperature is above 40°C and 'LO' will be
shown when temperature falls below 0°C.
2.11 Power Installation
The thermostat is operated at two AAA size 1.5V Alkaline
batteries. To power-up the unit, installs battery as shown in above
section “Battery Installation” and slide the ON/OFF switch to ON
position. When power is applied for the first time or reset button is
pressed, the display will show as follows:
When power is applied for the first time or reset button is pressed,
the display will show as follows:
If the display is different as shown, use a fine probe such as
straightened paper clip to gently push the reset button.
TIME 0:00
DAY MONDAY
TEMPERATURE 22°C
OUTPUT OFF
1
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4 SETTING PROGRAM
4.1 Pre-recorded Programs
Program Day of Week Time Temp for Heat Control
1 Weekday 6:00 20°C
2 (Mon - Fri) 8:30 14°C
3 16:00 20°C
4 22:00 14°C
5 Saturday 7:00 20°C
6 23:00 14°C
7 Sunday 7:30 20°C
8 22:00 14°C
1. After power up or reset, press P button to view the prerecorded
programs. All the programs are factory preset at the above
values.
2. Press P button again will scroll weekday (P1 - 4), Saturday (P5 -
6) and Sunday (P7 - 8) programs.
3. The program is set as a sequence: P1 » P2 » ... » P8 » P1 » ...
3. SETTING CLOCK
1. Press one of D, H or M button to set clock. Only the day of
week and the time are displayed.
2. Press D button to adjust the day of week.
3. Press H button to adjust the hour digits.
4. Press M button to adjust the minute digits.
5. Hold D, H or M button about 3 seconds to fast advance the
day, hour or minute adjustment rate respectively.
6. Press R button to return to normal operation mode.
7. The unit will return to normal operation mode if no key is
pressed for 10 seconds.
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6. Press D button will turn on or off the program. For example, you
want to turn off program 2, press P button to select program 2.
Then press D button. Program 2 is off as shown beside. Press D
button again will turn on the program.
7. Hold H, M, or button about 3 seconds to fast advance the
hour, minute, or temperature adjustment rate respectively.
8. Press R button to store the settings and back to normal
operation mode.
9. The settings will be stored automatically and back to normal
operation mode when no button is pressed about 10 seconds.
1
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P2
2 3 4 5
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The pre-recorded programs could be modified. Follow the
instructions shown below.
1. Press P button to select program (P1 - P8).
2. Press H button to set the hour indicator.
3. Press M button to increase the minute indicator setting by 15
minutes each time.
4. Push / button to adjust to your desired set temperature.
Temperature will be increased or decreased by 0.5°C for
each push.
5. Program temperature can only be set in the control
temperature range from 5°C to 35°C, not wrap around at two
ends.
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6:00
20.0
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P1
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5 MANUAL OVERRIDE
At the normal operation mode, the current temperature setting
could be overridden until the next program comes.
1. Push / button to view the overriding temperature which is
set last time.
2. Hold / button about 3 seconds and the temperature
indicator will flash one time.
3. Push / button to decrease or increase the temperature
setting.
4. Hold / button to fast advances the adjustment rate.
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normal mode with the new temperature setting.
6. The unit will be back to normal operation mode automatically
when no button is pressed about 10 seconds.
7. Program temperature can only be set in the control
temperature range from 5°C to 35°C, not wrap around at two
ends. When pushing the button to increase the temperature
to 35°C, the “up arrow” of the Manual Override Icon will be
turned off as shown.
Likewise, when pushing button to decrease the temperature
to 5°C, the “down arrow” of the Manual Override Icon will be
turned off as shown.

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6 HEATER OPERATION
6.1 Heater On Operation
The heater will be turned on by setting programs or manual
override.
If the heater is turned on by setting programs, the Program
Number, and the Heater On Icon will be
displayed as shown.
If the heater is turned on by manual override, only the Heater On
Icon will be displayed as shown.
6.2 Output-On Delay
For safety purposes, the thermostat has an auto 20 seconds' delay
for heater to restart.
18:58
20.0
°c
7
35.0
°c 5.0 °c
20.0
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P8
7
18:58
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8.2 Electrical Characteristics
Power Source: AAA 1.5V Alkaline
battery x 2
(not included)
Switching Relay:
Resistive load: 5 A a t 2 5 0 V A C
Inductive load: 3 A a t 2 5 0 V A C
Clock Accuracy: ±60 seconds/month
Temperature Measurement: 0 - 40°C
Temperature Accuracy: ±1.0°C
Temperature Control: 5 - 35°C
Temperature Control Span: 1°C
Output On Delay: 20 seconds
Operating Temperature: -10°C to 50°C
(non-condensing)
Storage Temperature: -30°C to 60°C
Operating polluted condition: Normal
7 LOW BATTERY OPERATION
When the voltage of the battery decrease to certain level, the low
battery indicator will be turned on and the thermostat cannot
detect the temperature anymore.
When the battery indicator is
turning on, the batteries should be changed as soon as possible to
avoid any data loss.
8 SPECIFICATIONS
8.1 Physical Characteristics
Size: 98 (W) X 28 (L) X 73 (H) mm
Material: Polycarbonate (PC)
Weight: 98g (battery not included)
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