175
13. Outdoor Unit Operation Control
13.1 System Start Control
13.1.1 Outdoor unit operation mode judgment
• When remote control, centralized control, or Cool/Heat Selector Switch (CZ-RD1) is turned ON, outdoor unit
operation mode is set as shown in table below:
Indoor Unit Operation Condition Outdoor Unit Operation Condition
Cool or Soft Dry Mode Cool Mode
Heat Mode Heat Mode
Fan Mode Off
• The priority of outdoor unit operation mode is given to the indoor unit that turn ON first, when another operation
mode is selected from other indoor unit, the subsequence operation mode will be standby.
• When all indoor units have stopped operation in deice control, outdoor unit continues operation Heat mode, and
operation mode stops after completion of deice control.
13.2 Outdoor Expansion Valve Control
Expansion Valve is a VDC12 solenoid valve that controls the amount of refrigerant flow.
Operation Power Up Comp Start Up Normal Control
Cooling Initialization Open 480pulse (fully) Open 480pulse (fully)
Heating Initialization
T
out > 10°C 350pulses
T
out = 1~10°C 400pulses
T
out 0°C 480pulses
Opening depend on condenser
super heat condition.
Initialization Process :
• 1st - Close valve fully.
• 2nd - Open valve fully.
Initialization Process will be executed every cycle of 10th compressor ON time during operation.
13.3 4 way Valve Control
4 Way Valve is a VAC220~240 solenoid valve used to reverse the refrigerant flow in system.
Cooling Operation Cycle : - 4 Way Valve OFF
Heating Operation Cycle : - 4 Way Valve ON
For 4 way valve control,
Delay 5sec for ON : - Accumulating pressure for valve mechanically opening.
Delay 60sec for OFF : - Equaling refrigerant pressure in system.
To Next Page
Loading...
