Samsung AM072BXV Series Service Manual page 247

Piping Diagram
7-3 Functions (cont.)
7-3-2 Control (cont.)
7-3-2-3 Normal operation modes (cont.)
Main heating operation
▪ Purpose
Switch to cooling mode on some indoor units while using heating mode.
▪ Control specifications in detail
Actuator
Compressor
Outdoor Fan Motor
Electronic Expansion Valve – Main (Main EEV)
Electronic Expansion Valve – EVI (EVI EEV)
Solenoid Valve - 4way
Solenoid Valve – EVI Bypass
Solenoid Valve – EVI
Solenoid Valve – Hot Gas Bypass
Solenoid Valve – Accumulator Oil Return
Solenoid Valve – Hot Gas Bypass 2 (HR Only)
Solenoid Valve – Main EEV (HR Only)
Solenoid Valve – Main Cooling (HR Only)
Samsung Electronics
-
Operation
COMP
Range
Operation
OFM
Range
Operation
E_M
Range
Operation
E_EVI
Range
V_4W Operation
V_EB Operation
V_EVI Operation
V_HG Operation
V_AR Operation
V_HG2 Operation
V_ME Operation
V_MC Operation
Main Heating
Target high pressure control
(default : 30kgf/cm2,g)
20-160Hz
Target low pressure control
(default : 7.5-8.7kgf/cm2,g)
0-39step (0-1300rpm)
*Superheat control
(default: SH 2 K)
125-2000step
* EVI Superheat control
(default: SH 2 K)
0-480step
On
On (Open):
T_a > 15℃ or 50Hz ↓
Off (Close):
T_a < 10℃ and 70Hz ↑
On (Open)
Off (Close)
On (Open)
Off (Close)
Off (Close)
Off (Close)
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