Piping Diagram
Samsung Electronics 245
Electronic Expansion Valve(EEV) Control
ƒ Purpose
General control: Maintain the amount of refrigerant flowing into the indoor units at the appropriate level.
Inactive indoor unit control: Prevent insuffi
cient refrigerant due to refrigerant stagnating in the piping connected to inac-
tive indoor units.
ƒ Concept
General control: Control is performed with the superheat degr
ee in cooling mode. In heating mode, control is performed
with the subcooling degree.
Inactive indoor unit control: The gas pipe is kept open slightly in heating
mode to prevent refrigerant from stagnating in
the piping.
ƒ Control specifications in detail
∙ Condition(s) required to use modes
- General control : Thermos on indoor units are on
- Inactive in
door unit EEV control: (Comp OFF) or (Comp ON and Indoor unit Thermo-OFF)
∙ Operation specifications
- General control: Control is performed with the superheat degree
at the exit of indoor heat exchanges in cooling mode.
In heating mode, control is performed with the subcooling degree.
- Inactive indoor unit EEV control: Contro
l is performed as shown in the following table.
Outdoor unit operation COMP ON COMP OFF
Indoor unit operation Cooling Heating
COMP stops
- 3 min
COMP stops
3 - 5 min
COMP stops
5 min elapses
(Auto) cooling /
Dehumidifi
cation /
Fan
Thermo On Cooling EEV control 0035
Thermo Off 0Note 1* 0035
(Auto) heating
Operation On Heating EEV control 35 35 35
Operation Off 0Note 1* 35 35 35
* Note 1 : Control of inactive heating units (lower noise/general)
Outdoor unit for first priority
outdoor unit
CAM EDM high-head EDM general
0ఁ or lower 80 130 200
Above 0ఁ 80 120 180
Cooling
Condensed liquid
Gas
Hot gas
Condensed liquid
Heating
7-3 Functions (cont.)
7-3-2-6 Indoor unit control (cont.)
7-3-2 Control (cont.)
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