Sanyo MDF-U55V, Service Manual

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Control specifications 

Item Specifications 

Temperature controller 

Microcomputer, key-pad input 
Non-volatile memory 

Temperature setting range 

-50

䉝

~-90

䉝

 (Unit: 1

䉝

) 

Temperature display 

LED (Unit: 1

䉝

) 

Temperature sensor 

Pt. 1000

䃈

High temperature alarm 

When chamber temperature deviates from set temp5

䉝䡚

+20

䉝

(Factory d10

䉝

), ALARM lamp blinks and buzzer sounds after 15 

minutes of delay. 
Remote alarm contact: Normal Open, Normal close 
                                          Rated (max) 30VDC, 2A 
                                          Turns over after 15minutes of delay 

Low temperature alarm 

When chamber temperature deviates from set temperature-5

䉝䡚

-20

䉝

(Factory default:-10

䉝

), ALARM lamp blinks and buzzer sounds after 15 

minutes of delay. 
Remote alarm contact: Normal Open, Normal close 
                                          Rated (max) 30VDC, 2A 
                     Turns over after 15minutes of delay 

Filter alarm 

FILTER lamp illuminates and buzzer sounds intermittently. 

Door alarm 

When a door is open, DOOR lamp illuminates after predetermined delay 
time elapses. (Factory default: 2minutes, Range:1~15minutes) 

Power failure alarm 

ALARM lamp blinks and buzzer sounds intermittently. 
Remote alarm activates. 

Remote alarm 

Allowable contact capacity

䠖

DC30V  2A

䚸

N.C.-COM

䠈

N.O.-COM 

When temperature alarm or power failure alarm is occurred or any sensor 
is failed, remote alarm contact turns over. 

Notice of battery life 

BATTERY lamp illuminates when battery accumulation time (2.8 years) 
expires. 

Notice of condensing fan 
motor life 

BATTERY lamp blinks when condensing fan motor accumulation time 
(5.6 years) expires. 

STATUS function 

z

Notice of Battery/condensing fan motor life 

z

Abnormal power supply voltage 

z

Abnormal ambient temperature 

z

Overloaded operation 

Control panel 

Alarm lamp: ALARM 
Filter check lamp: FILTER 
Battery check lamp: BATTERY 
Status monitor lamp: STATUS 
Door check lamp: DOOR 
Buzzer stop key: BUZZER 
Alarm test key: ALARM TEST 
Status key: STATUS 
SET

䠖

Set key 

    : Digit shift key 
    : Numerical value shift key 

Key Lock 

Press digit shift key for 5 seconds to activate Key Lock mode. 
L0: Unlock

䚸

L1: Lock 

Self diagnosis function 

When temp. sensor or filter sensor or cascade sensor or AT sensor is 
failed; 
Error code is displayed, ALARM lamp illuminates, buzzer sounds and 
remote alarm is active.