Service manual

2-5
Device name Actuation Set point Detection method Symbol
High-pressure switch OFF 2400kPa (24.47kg/cm
2
) High-pressure switch HPS
ON 1900kPa (19.37kg/cm
2
)
Water pressure switch OFF 98kPa (1.0kg/cm
2
) Water pressure switch WPS
(optional) ON 39kPa (0.4kg/cm
2
)
Chilled mode ON +30.0°C to –2.9°C Set point temperature EC
(+86.0°F to +26.8°F)
Mode selection
Partial frozen mode –3.0°C to –10.0°C
(+26.6°F to +14.0°F)
Frozen mode –10.1°C to –30.0°C
(+13.8°F to –22.0°F)
Delay Fan
Change-over for Hi/Lo ON 10 seconds
timer After defrosting 60 seconds
Compressor
At starting 3 seconds
Defrosting Short ON 4 hours ※1
timer Long 3, 6, 9, 12, 24 and 99 hours(※2)
Back-up OFF 90 minutes
In-range masking 90 minutes ※3
Out-range guard ON 30 minutes
Defrosting termination set point ※6 OFF 30˚C (86°F) Evaporator outlet EOS
Reset tempertature sensor
15˚C (59°F) ※4
Return air temperature RS, DRS
sensor
High-pressure control for Condenser fan OFF 800kPa (8.2kg/cm
2
) ※7 High-pressure transducer
HPT
(※Frozen only) ON 1000kPa (10.2kg/cm
2
)
Discharge gas Pull down OFF 135˚C (275°F) Discharge gas DCHS
temperature LPT>50kpa
Reset
After 3 minutes elapsed temperature sensor
protection LPT≦50kpa OFF 128˚C (262°F)
set point Reset After 3 minutes elapsed
Overcurrent protection set point (Cutout) OFF 26.0A PT/CT board CT2
Reset After 3 minutes elapsed
Current control Control 50Hz : 16.1A PT/CT board CT1
60Hz : 17.4A
High pressure control Control 2300 to 2350 kPa High pressure sensor HPT
(23.5 to 24.0 kg/cm
2
)
Circuit breaker OFF 30A CB
Fuse OFF 5A, 10A ※5Fu
Evaporator fan motor thermal protector OFF 132˚C (270°F)
Condenser fan motor thermal protector OFF 135˚C (275°F) MTP
Compressor motor thermal protector OFF 140˚C (284°F) CTP
2.3 Set point of functional parts and protection devices
Electronic controller
Initiation
Current
Motor
Pressure switch
(※1) When Return air (RS) is lower than –20˚C, defrost starts every 6 hours.
(※2) When "99" hours is selected, refer to on demand defrost in 2.5.3.
(※3) When Inside set point is –20.0˚C or Lower, In-range masking is 120min.
(※4) If defrost is initiated when inside temperature is out rangle area. (= In-range LED is not light), this condition is added to
finish defrost. Refer to "Defrosting termination" in 2.5.3.
(※5) Refer to "Fuse Protection table" in 7.11.
(※6) In Bulb mode, this setting can be adjusted. (Refer to "Bulb mode" Page 2-20)
(※7) When dehumidification is ON in Bulb and dehumidification mode, the setting figure may change between 900~2100kPa
automatically (Refer to "High Pressure Control" Page 2-17)