Piping Diagram
Samsung Electronics 342
Rotation defrost operation
▪ Purpose
Activate defrost mode on module-installed HR outdoor units in sequential order to improve heating efficiency.
▪ Concept
- Defrost operation is performed on outdoor units in sequential order when main heating mode is active on HR outdoor units.
- If rotational defrost mode is used 3 times consecutively, defrost operation will be performed on all the outdoor units when
defrost mode is turned on again.
▪ Control specifications in detail
- Enabled only when rotational defrost mode has been enabled by the Key option.
- Rotational defrost operation is performed in the following cases: two or more outdoor units are installed, the outdoor tempera-
ture is -5℃ or higher, rotational defrost has not been performed 3 times consecutively, the previous defrost mode was a general
defrost, or the duration of rotational defrost < the quantity of indoor units x 10 min.
- For the sequence of rotational defrost, the order of priority for outdoor units is followed.
- For the temperature and time conditions required to enter defrost mode, the same conditions as general defrost mode are
applied.
- Condition(s) required to turn off defrost mode: Cond out temp ≥ 15℃ OR 12 min after defrost mode has started.
Actuator Outdoor units in defrost mode Units not being in defrost mode
Compressor
Depends on the outdoor unit capacity
(86-110Hz)
General control
Outdoor EEV Full close General control
Outdoor Fan 0 step General control
HR EEV Off General control
Main cooling valve ON General control
Indoor
EEV
Cooling indoor
unit
Active unit General control
Inactive unit Required step for control of the superheat degree
Heating Active unit General control
Indoor unit Inactive unit General control on inactive units
Indoor
Fan
Cooling indoor
unit
Active unit General control
Inactive unit Set fan speed
Heating Active unit Mid fan speed
Indoor unit Inactive unit Off
Time Maximum of 12 min -
7-3 Functions (cont.)
7-3-2-4 Special operation modes (cont.)
7-3-2 Control (cont.)
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