,3
3(
&
2
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
M
button to adjust the minutes.
5. Hold
D
,
H
or
M
button for about 3 seconds to speed up day, hour or minute adjustment rate
respectively.
6. Press
R
button 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
P
button to view the recorded programs. All the programs are factory
preset to the above values.
