Samsung AM200FXWANR - Page 209

Samsung Electronics 208
Piping Diagram
Solenoid Valve – EVI, Solenoid Valve - EVI Bypass
Solenoid Valve - Hot Gas Bypass
Solenoid Valve - Hot Gas Bypass 2
ƒ Purpose
Switch between EVI Bypass Mode, EVI On Mode, and EVI Off Mode, depending on the EVI EEV status.
ƒ Concept
- Solenoid valve – EVI : When Vapor/Flash Injection
is in use, the valve is closed to let refrigerant flow into the compressor.
- Solenoid valve - EVI Bypass : If a compressor has stopped, the valve is clos
ed to prevent the refrigerant that has passed through
the EVIEEV from flowing into the compressor.
ƒ Control specifications in detail
Control valves according to the EVI Mode, as shown be
low.
ƒ Purpose
Protect the system when high pressure is abnormally high or low pressure is abnormally low.
ƒ Concept
If either pressure is abnormal, the valve is ope
ned to bypass the high-pressure gas to the low pressure pipe.
This will change the pressure.
ƒ Control specifications in detail
ON if cooling low pressure is below 3.2kgf/cm2
,g / OFF if above 4.2kgf/cm2,g (at minimum frequency, OFF if above 6.0kgf/cm2,g)
On if heating low pressure is below 2.6kgf/cm2, / OFF if abo
ve 3.5kgf/cm2.
ƒ Purpose
Prevent refrigerant from stagnating in the high pressure gas pipe in cooling-only mode.
ƒ Concept
- In cooling-only mode, the valve is open
ed to switch the high pressure gas pipe to the low pressure gas pipe.
- If the valve is closed, refrigerant stagnates in the high pressure gas
pipe causing a lack of refrigerant.
- HR Only
ƒ Control specifications in detail
If using the Heat Recovery device, the valve is opened (ON) after cooling-only mode has been on for more tha
n 20 minutes or when
cooling oil return mode is active.
EVI Mode
Electronic Expansion Valve
- EVI
Solenoid valve
- EVI
Solenoid valve
- EVI Bypass
* Condition
EVI Bypass mode Open Open Open Normal Operation
EVI On m
ode Open Open Close
- All comp. in unit 65hz װ
- Water Temp. < 38ఁ (cool)
< 25ఁ (heat)
- Control by unit
EVI Off mode Close Open Open - Safety start
7-3 Functions (cont.)
7-3-2-1 Actuator (cont.)
7-3-2 Control (cont.)