SELENA Multifunctional LED Clock USER MANUAL V32D
KERA TECHNOLOGIES INC. 2013 www.ledclocks.com
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NOTE 1 By pressing the MUTE key at this time, -40F (C) temperature will be brought up on display. When the
Target Temperature is set to -40F (C) the preset will be IGNORED by the thermostat control for that event.
NOTE 2 By pressing the CLR key at this time the currently read probe temperature will be brought up on
display.
When satisfied, press the NXT key.
A) If in the “AUTO” mode, GO TO STEP 5.
B) If in the “MANU” mode, GO TO STEP 6.
5. The display will show the hour and the minute (HH:MM) of the event that day. Using UP and DN keys set the
required time of the event. To move the cursor press the NXT key.
6. When satisfied with the event presets, press the HOLD key to store the data in memory.
MAKE SURE that this is done WHILE either the Temperature or the event Hours:Minutes is on the display. If it is
not so, the OLD data will be stored in memory.
7. The display will flash the text: “Strd“ momentarily to indicate that the programmed data has been stored in the
memory.
8. Press the NXT key to go back to Step 2 in order to continue programming of other events
or
If finished, wait a few seconds for the system to return to the Normal Operating Mode. The thermostat program will
start executing automatically.
IMPORTANT NOTES
A) In both, the “AUTO” and the “MANU” modes:
In order to ensure proper operation of COOLING and HEATING, the Auto Switch-Over limits must be programmed.
This is done by programming the presets for SUNDAY Events 30 and 31 . Programming of those events must be
performed in the “AUTO” mode.
- The COOLING switch-over temperature limit ( SUNDAY event 31 ) is the temperature ABOVE which the Cooling
relay will be energized and only when the Target Temperature is lower than the temperature sensed by the probe.
- The HEATING switch-over temperature limit ( SUNDAY event 30 ) is the temperature BELOW which the Heating
relay will be energized and only when the Target Temperature is higher than the temperature sensed by the probe.
B) If ONLY HEATING or ONLY COOLING control is required :
- If only HEATING control is required, the HEATING switch-over temperature limit ( SUNDAY event 30 ) must be
programmed as lower than any temperature ever expected and the COOLING switch-over temperature limit ( SUNDAY
event 31 ) as higher than any temperature ever expected .
- If only COOLING control is required, the COOLING switch-over temperature limit ( SUNDAY event 31 ) must be
programmed as lower than any temperature ever expected and the HEATING switch-over temperature limit ( SUNDAY
event 30 ) as higher than any temperature ever expected .
C) The Target Temperature for the “MANU” mode:
The target temperature for the “MANU” mode is stored in SUNDAY event 29 . It may be preset in either the “MANU” or
the “AUTO” mode.
Note, that the “MANU” mode is also using the HEATING and COOLING Auto Switch-Over limits ( as preset for
SUNDAY Event 30 and 31 ) as its operating limits. Programming of those events must be performed in the “AUTO”
mode.
D) The order in which the thermostat is searching for active events is from event “00“ thru event “31“. The search is
performed at 00 seconds of each minute of the clock real time. First encountered active event shall be executed and
further search shall be aborted until the next minute of the real time clock reading. Therefore, if more than one event for
the day has the same time as any other, only the younger (in order) event number shall be executed. This may have
application in deactivating unused events by setting them as identical to the highest used event number for the day.
E) When the Supply Power is removed between the event times, after the power is restored the thermostat will SEARCH
BACK all active events that should have been executed. This search is performed in the REVERSED ORDER: from
events 31 thru 00 of each day. The most recent, valid event will be executed. Therefore, care must be taken when
programming the thermostat, so that the unused events in each day either have -40F(C) set as the Target Temperatures
or the OLDEST event number for each day is copied into the unused events for that day.
F) SYSTEM WARM-UP :
During the first 5 minutes after the system Power-up, the temperature readings may show unreal values. The system will
correct the readings after the warm-up time.
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