Motorized Valve Control Of Outdoor Unit - Daikin FTX25JVEA9 Service Manual

Si18-201
3.26

Motorized Valve Control of Outdoor Unit

3.26.1 Outline of Motorized Valve Control
Outline The EVL and EVG valve opening operations switch the with/without-receiver selection.
Cooling mode
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"
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Heating mode
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"
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Main Functions
When EVL is fully closed (without receiver), the BP motorized valve provides the system
control and distribution control.
EVU ... Target discharge pipe temperature control, gas pipe isothermal control
EVT ... Fully closed
EVG ... Target discharge pipe temperature control
When EVL is not fully closed (with receiver), EVG provides the system control.
H/U's motorized valve provides individual control. (SH control)
EVU ... SH control
EVG ... Target discharge pipe temperature control
Common
EVL ... Outdoor unit SC control
EVP ... Capacity control (low pressure control)
When EVG is fully closed (without receiver), the BP motorized valve provides the system
control and distribution control.
EVU ... Target discharge pipe temperature control, SC control
EVT ... Target discharge pipe temperature control
∗
Surplus refrigerant processing is conducted in non-operating room units.
∗
When motorized valves of non-operating room units are at minimum opening:
The receiver function ON is set (EVG opens).
EVL ... Target discharge pipe temperature control
When EVG is not fully closed (with receiver)
Not in capacity control
EVU ... Target discharge pipe temperature control, SC control
EVT ... Target discharge pipe temperature control
EVL ... Target discharge pipe temperature control
EVG ... Target discharge pipe temperature control + Capacity control (high pressure control)
EVP ... Capacity control (high pressure control)
System control ... Provides SH control of refrigerant system, particularly suction control
Examples: SH control, target discharge pipe temperature control
Distribution control ... Distributes refrigerant volume to individual indoor units according to
loads. (This function does not control the absolute volume.)
Examples: Gas pipe isothermal control, liquid pipe isothermal control
Individual control ... Controls refrigerant amounts of refrigerant supplied to individual room
units based on the absolute volume.
Examples: SH control (determined by individual indoor units), SC control
Filter
EVL
EVG
M
M
Oil separator
HPS
LPS
JT100F-VD
Filter
Filter
Filter
EVP
Flexible
tube
(M1037)
EVL: Liquid pipe motorized valve
EVG: Gas pipe motorized valve
EVP: Discharge bypass motorized valve
System control
145