IPPEC Pexatherm User manual

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Pexatherm LCD Programmable Thermostat
1. INTRODUCTION
The Pexatherm LCD thermostat can replace most common indoor residential thermostat and is designed to
be used with electric, gas or oil heating system.
1.1 Features
Several useful functions and operating modes have been incorporated to adapt to a variety of customer
needs.
• LCD shows the “NEED TO KNOW” Information only, which is more easy
to understand
• 8 programs for weekdays, Saturday and Sunday.
• Real Time Clock with Day Display
• Room Temperature Display
• Simple Temperature Adjustment
• Simple Programming Procedure
• Manual Set-Temperature Override
• 2 x AAA Size Alkaline Batteries (Not Included)
• Low Battery Indication
• Heater Operation Mode
• Compact Design
2. INSTALLATION
The Pexatherm 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 5A rating should be in the power line.
3. Observe the national regulation for the winter.
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:
1. To avoid electric shock, turn off the power of heating system at the main power box in your home.
Read the following instructions carefully before disconnecting the wires.
2. Remove the cover from the old thermostat.
3. Unscrew the old thermostat from the wall plate.
4. Unscrews the wall plate and pull a small distance from the wall. Do not disconnect any wire yet.
Warning:
High voltage is dangerous. Please consult a qualified electrician if in any doubt.
2.3 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: Draughts, air ducts, radiant heat from the sun or appliances, concealed pipes and
chimneys
3. The best viewing angle is 12 o`clock direction.
2.4 Wall Mounting
1. Remove the front housing of the thermostat by using a screwdriver.
2. Mark the holes` position and align the wire coming from the wall in the hole beside the connectors.
3. Drill two holes and insert the plastic plugs carefully into the holes until they are flush with the wall.
4. Fasten securely the thermostat to the wall with the screws.
Display

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2.5 Wiring
1. Identify and disconnect each wire from the old thermostat..
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 large fill it to prevent hot or cold
draught. The thermostat will function properly.
3. Connect the wires to the terminals as in the wiring diagram shown.
The Pexatherm programmable thermostat can be used with single stage
heating system. Inside the thermostat, three terminals are labeled COM
(Common), NC (Normally Closed) and NO (Normally Open). In the case of
live supply, connect this to the COM and NO to the switched live. If the thermostat is closing a circuit (0
voltage) the COM and NO could be connected either way. The NC connection is for cooling equipment.
OPERATION
3.1 Battery Installation
The 099a is operated by two AAA 1.5V Alkaline batteries. Please follow the installation instruction:
1. The battery door is at the side of the case.
2. Slide the door upward to open it.
3. Replace the old batteries.
5. Ensure the polarity of the batteries are correct.
6. Push and slide the door down to close it.
Skip instruction (3) when installed from new
3.2 Temperature Set Back
This is the temperature difference between the ON and OFF mode. The factory set back is 1°C. For
example, control temperature setting is 20°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.
3.3 Text Display
“HI” will be shown when temperature is above 40°C and “LO” will be shown when temperature falls below
0°C.
3.4 Factory Preset
When power is supplied for the first time or reset button is pressed, the display will show as below. If the
display is different, use a fine probe such as straightened paper clip to gently push the reset button.
Temperature: 22°C, Control temperature: 20°C Output: Off
3.5 Setting the Clock
2. Press D button to adjust the day of week.
3. Press H button to adjust the hour.
4. Press Mbutton to adjust the minutes.
5. Hold D, Hor Mbutton for about 3 seconds to speed up day, hour or minute adjustment rate
respectively.
6. Press Rbutton to return to normal operation mode or if no key is pressed for 10 seconds.
3.6 Factory Preset Programs
Program Day of Week Time Temperature
1 6:00 20ºC
2 Weekday 8:30 14ºC
3 (Monday –Friday) 16:00 20ºC
4 22:00 14ºC
5 Saturday 7:00 20ºC
6 23:00 14ºC
7 Sunday 7:30 20ºC
8 22:00 14ºC
1. After power up or reset, press Pbutton to view the recorded programs. All the programs are factory
preset to the above values.

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2. Pressing the Pbutton again will scroll weekday (P1-4), Saturday (P7-8) programs.
3. The program is set as a sequence: P1 » P2 » … » P8 » P1 » …
3.7 Program Modification
The preset programs could be modified by following the instructions shown below:
1. Press Pbutton to select program (P1-P8).
2. Press Hbutton to set the hour indicator.
3. Press Mbutton to increase the minute indicator setting by 15 minutes each time.
4. Press Up or Down button to desired temperature. Temperature increments are in 0.5ºC.
5. Temperature can only be set in the range of 5°C to 35°.
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 Dbutton. Program 2 is off as shown. Press Dbutton again will
turn on the program
7. Hold H, M, Up or Down button about 3 seconds speed up the hour, minute, or temperature adjustment
rate respectively.
8. Press Rbutton to store the settings and return to normal operation mode.
9. The setting would be stored automatically and return to normal operation mode when no button is
pressed for about 10 seconds
3.8 Setback Mode
This mode is used to save power when space is not occupied.
Pressing the Up and Down buttons simultaneously for about 5 seconds will activate the setback mode.
All operation will be paused In this mode. The display will be blank and the relay is turned off. Pressing any
key will restore full operation.
3.9 Manual Override
In the normal operation mode, the temperature fixed as follows:
1. Press Up or Down button to view overriding temperature which was set last time.
2. Hold Up or Down button about three seconds and temperature indicator will blink once.
3. Press Up or Down button to increase or decrease the temperature setting.
4. Hold Up or Down button to speed up the adjustment rate.
5. Press Rbutton to terminate the setting procedure and back to normal mode with the new temperature
setting.
6. The unit will revert to normal operation when no button is pressed about 10 seconds.
7. The temperature can only be set in the range of 5°C to 35°C.
3.10 Heater Operation
The heater will be turned on by setting programs or by 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.