KT50 - Thermometer ELRO - Free user manual and instructions

Product Type	Indoor residential thermostat for single stage heating systems
Compatible Heating Systems	Electric, gas, or oil
Dimensions (W x L x H)	98 x 28 x 73 mm
Weight	98 g (batteries not included)
Housing Material	Polycarbonate (PC)
Power Source	2 x AAA 1.5V alkaline batteries (not included)
Switching Relay (Resistive Load)	5A at 250VAC
Switching Relay (Inductive Load)	3A at 250VAC
Temperature Measurement Range	0°C to 40°C
Temperature Measurement Accuracy	±1.0°C
Temperature Control Range	5°C to 35°C
Temperature Control Span	±0.5°C
Output On Delay	20 seconds (for safety)
Operating Temperature	-10°C to 50°C (non-condensing)
Storage Temperature	-30°C to 60°C
Display	LCD showing room temperature, control temperature, heater on/off, low battery
Control Buttons	▲ (increase) and ▼ (decrease) buttons
Installation Type	Wall-mounted, requires drilling and screws (not included)
Wiring Terminals	COM (common), NC (normal close), NO (normal open)
Low Battery Indication	LCD goes blank when battery voltage is low
On/Off Switch	Slide switch to turn thermostat on/off

Frequently Asked Questions - KT50 ELRO

What type of heating systems is the Elro KT50 compatible with?

The Elro KT50 is designed for single stage heating systems and is compatible with electric, gas, or oil heating systems.

What batteries does the Elro KT50 use and how long do they last?

The thermostat uses two AAA 1.5V alkaline batteries (not included). Battery life depends on usage; when the battery voltage drops, the LCD will go blank indicating it's time to replace them.

How do I install the Elro KT50 thermostat?

Installation involves mounting the thermostat on a dry indoor wall about 1.5m above the floor. Drill two holes, insert wall plugs, and secure with screws. Connect wires to COM, NC, or NO terminals as per your heating system. Finally, insert batteries and slide the power switch to ON.

How do I adjust the temperature on the KT50?

At normal operation, press the ▲ or ▼ button to view the current set temperature. To change it, hold either button for about 3 seconds until the temperature indicator flashes, then use the buttons to adjust between 5°C and 35°C. The setting saves automatically after 10 seconds of inactivity.

What does the 'Heater On' icon mean?

The 'Heater On' icon appears when the room temperature is lower than the programmed temperature, indicating the thermostat has activated the heating system.

Why is there a 20-second delay before the heater restarts?

The 20-second 'Output-On Delay' is a safety feature to protect the heating system from rapid cycling, which can cause damage.

What do 'HI' and 'LO' on the display mean?

'HI' appears when the room temperature is above 40°C, and 'LO' appears when it is below 0°C. These indicate the temperature is outside the measurement range.

How do I reset the Elro KT50 thermostat?

To reset, use a fine probe (like a straightened paper clip) to gently press the reset button. After reset, the display will show 22°C room temperature, 20°C control temperature, and 'OUTPUT OFF'.

What is the temperature control span?

The factory preset span is ±0.5°C. For example, if the control temperature is set to 20°C, the heater turns on at 19.5°C and off at 20.5°C.

Where should I mount the thermostat for accurate readings?

Mount it about 5 feet (1.5 m) above the floor in an area with good air circulation, away from drafts, air ducts, direct sunlight, radiant heat from appliances, concealed pipes, and chimneys.

USER MANUAL KT50 ELRO

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TABLE OF CONTENT

1 INTRODUCTION....2
2 INSTALLATION 4
3 CONTROL TEMPERATURE.... 11
4 LOW BATTERY OPERATION.... 13
5 HEATER OPERATION.... 13
6 SPECIFICATIONS....14

1 INTRODUCTION

This thermostat can replace most common indoor residential thermostat and is designed to be used with electric, gas or oil heating system.

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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

• Room Temperature Display
• Simplified Temperature Adjustment
• Heater Operation Mode
• 2 x AAA Size Alkaline Batteries (not included)

- Low Battery Indicator

- On/Off Switch

- Slim Housing Design

2 INSTALLATION

CAUTION:

1. The appliance can only be mounted on dry indoor places.

2. A suitable fuse with a 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.

This thermostat has been designed for simple and quick installation requiring only a few tools.

2.1 Required Material

Hammer

Masking tape

Drill and 3/16" drill bit

Screwdriver

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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:
   i. Drafts of dead air sports
   ii. Air ducts
   iii. Radiant heat from the sun or appliances
   iv. Concealed pipes and chimneys
3. The best viewing angle is 12 o'clock direction.

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2.5 Mounting

1. Mounting the thermostat onto the wall.
2. Remove completely the front housing of the thermostat by loosening the screws at the bottom.(see picture)
3. Mark the holes' position and align the wire coming from the wall in the hole beside the connectors.(see picture)
4. Drill 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.

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".

Close-up of a handheld electronic device with a display and control buttons (no visible text or symbols)

Interior view of an electronic device showing internal circuitry and components (no visible text or symbols)

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2.7 Wiring Diagram

The KT50 thermostat can be used with single stage heating system. Inside the thermostat, three terminals which label COM(common), NC(normal close) and NO(normal open) would be found. In most case, COM and NO are used.

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Close-up of a hand holding an electronic device with visible internal components (no text or symbols)

2.8 Battery Installation

The KT50 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.

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1. Slide the door downward to open it.
2. Two old batteries would "jump out".
3. Take out the old batteries.
4. Insert two batteries in right position as shown. Ensure the polarity of the batteries are in right position.
5. Push and slide the door up to close it. If first use, skips the instruction (3) and (4).

Close-up of hands holding a white electronic device with a display screen (no visible text or symbols)

2.9 Temperature Span

Span is the temperature difference between the turn ON and OFF temperature.

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The factory pre-set spanis +/- 0.5°C. For example, control temperature setting is 20°C. The heater will be operated when the roomtemperature 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 by two AAA 1.5V Alkaline batteries.

To power-up the unit, install the batteries as shown in above section "Battery Installation" and slide the ON/OFF switch to ON position.

When power is supplied for the first time or reset button is pressed, the display will show as follows:

TEMPERATURE 22°C CONTROL TEMPERATURE 20°C OUTPUT OFF

If the display is different as shown, use a fine probe such as straightened paper clip to gently push the reset button.

3 CONTROL TEMPERATURE

At the normal operation mode, the temperature could be set.

1. Push ▲/▼button to view the setting temperature which was set last time.
2. When power up or reset, the factory preset control temperature 20^ C is shown.

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1. Hold ▲/▼button about 3 seconds and the temperature indicator will flash one time.
2. Push ▲/▼button to increase or decrease the temperature setting.
3. Hold ▲/▼button to fast advances the adjustment rate.
4. The unit will be back to normal operation mode automatically when no button is pressed about 10 seconds.
5. Program temperature can only be set in the control temperature range from 5°C to 35°C, not wrap around at two ends.
6. When pushing the ▲button to increase the temperature to 35°C, it is no further increment.

Likewise, when pushing ▼ button to decrease the temperature to 5°C, it is no further decrement.

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When the voltage of the battery decrease to certain level, the LCD will be blank. In this case, the batteries should be changed as soon as possible to avoid any data loss.

5 HEATER OPERATION

5.1 Heater On Operation

The heater will be turned on when the room temperature is lower than the programmed temperature and the Heater On Icon will be displayed as shown.

5.2 Output-On Delay

For safety purposes, the thermostat has an auto 20 seconds' delay for heater to restart.

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6 SPECIFICATIONS

6.1 hysical Characteristics

Size: 98(W)X 28(L)X 73(H) mm

Material: Polycarbonate (PC)

Weight: 98g (battery not included)

6.2 Electrical Characteristics

Power Source:

AAA 1.5V Alkaline battery x 2

Switching Relay:

Resistive load: 5A at 250VAC

Inductive load: 3A at 250VAC

Temperature Measurement: 0 - 40°C

Temperature Accuracy: +/- 1.0°C

Temperature Control: 5 - 35°C

Temperature Control Span: +/- 0.5°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

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