Samsung AM072BXV Series, Service Manual, Page: 247 / 326

Piping Diagram
Samsung Electronics 241
Main heating operation
▪ Purpose
Switch to cooling mode on some indoor units while using heating mode.
▪
Control specifications in detail
Actuator - Main Heating
Compressor COMP
Operation
Target high pressure control
(default : 30kgf/cm2,g)
Range 20-160Hz
Outdoor Fan Motor OFM
Operation
Target low pressure control
(default : 7.5-8.7kgf/cm2,g)
Range 0-39step (0-1300rpm)
Electronic Expansion Valve – Main (Main EEV) E_M
Operation
*Superheat control
(default: SH 2 K)
Range 125-2000step
Electronic Expansion Valve – EVI (EVI EEV) E_EVI
Operation
* EVI Superheat control
(default: SH 2 K)
Range 0-480step
Solenoid Valve - 4way V_4W Operation On
Solenoid Valve – EVI Bypass V_EB Operation
On (Open):
T_a > 15
℃
or 50Hz
↓
Off (Close):
T_a < 10
℃
and 70Hz
↑
Solenoid Valve – EVI V_EVI Operation On (Open)
Solenoid Valve – Hot Gas Bypass V_HG Operation Off (Close)
Solenoid Valve – Accumulator Oil Return V_AR Operation On (Open)
Solenoid Valve – Hot Gas Bypass 2 (HR Only) V_HG2 Operation Off (Close)
Solenoid Valve – Main EEV (HR Only) V_ME Operation Off (Close)
Solenoid Valve – Main Cooling (HR Only) V_MC Operation Off (Close)
7-3 Functions (cont.)
7-3-2-3 Normal operation modes (cont.)
7-3-2 Control (cont.)