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Key lock function
In PV display、Keep pushing key over 5 seconds to enter key lock mode displaying with
“L0”.
Push key to 1 ・・・・・key lock ON
0 ・・・・・key lock OFF
then press SET key to memorize set value then return to PV display.
Note） With key lock ON to enter SET mode, but unable to change value.
With key lock ON to perform Function and ALARM TEST, while unable to perform
DEF.
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Power failure alarm (Buzzer and display isn’t functioned without buttery power
supplied)
When power failure is occurred, power failure alarm will be turned on by battery inside units.
During power failure alarm, alarm lamp is blinking, digit display turns off, buzzer sounds
intermittently and remote alarm contact turns ON.
Press BZ key to turn power failure alarm buzzer OFF.
Press BZ key to display PV for 5 seconds.
During power failure alarm, only BZ key (TOP/BOTTOM key for MDF-U537D) is available.
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Alarm test
The function is to check performance (failure) for alarm lamp, buzzer and remote alarm.
In PV display, press ALARM TEST key to blink alarm lamp, to sound buzzer intermittently, to
turn remote alarm contact on (Without time delay). Digital display will be turned off.
During alarm test, only ALARM TEST key is available.
Note: During alarm test, with buttery switch turned OFF to display error code E09.
Displaying error code E09 takes priority over other error codes before ALARM TEST is
performed.
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Auto return function
Function: During setting mode or key lock mode or function mode with any key not pressed
for 90 seconds, value will not be memorized to return to PV mode automatically.
Note: In F09 or F10, auto return function will not be performed.
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Compressor delay start time
During cycle time, normally force to turn compressor OFF after 2 minutes passed compressor
turned off.
When main power is supplied (microcomputer is RESET), changeable to set compressor time
lag for 1 ～15 minutes. (See F05)
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