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2.5 Operation modes and control
There are two main types of operation modes: the cargo cooling control mode and the unit
inspection mode.
The cargo cooling control mode is explained in this section.
※For the unit inspection mode, refer to section 3.9.
The relationship between the operation mode and setting temperature is as follows.
※For details, refer from clause 2.5.1 to 2.5.4
Mode selection
Operation mode
Setting temperature
Control sensor Inside fan
Operation description
Mode selectionq
※1
Chilled mode
–10.0˚C to +30.0˚C
(–14.0˚F to +86.0˚F)
Supply air
temperature
sensor
High speed
Capacity control
operation with suction
modulating valve and
hot-gas bypass control
Frozen mode
–30.0˚C to –10.1˚C
(–22.0˚F to +13.8˚F)
Return air
temperature
sensor
Low speed
Compressor
ON/OFF control
Mode selectionw
※1
Chilled mode
–3.0˚C to +30.0˚C
(+26.6˚F to +86.0˚F)
Supply air
temperature
sensor
High speed
Capacity control
operation with suction
modulating valve and
hot-gas bypass control
Partial frozen
mode
–10.0˚C to –3.1˚C
(–14.0˚F to +26.4˚F)
Return air
temperature
sensor
High speed
Capacity control
operation with suction
modulating valve and
hot-gas bypass control
Frozen mode
–30.0˚C to –10.1˚C
(–22.0˚F to +13.8˚F)
Return air
temperature
sensor
Low speed
Compressor
ON/OFF control
Defrosting mode - - OFF
Hot-gas defrosting with
refrigerant metering
control
※1 Mode selection q or w depends on the model.
To check the mode, see the LED after setting the temperature to "
–9˚C
". If "SUPPLY" LED lights
up, the current mode is q, while it is w, if "RETURN" LED lights up.
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