Piping Components - Daikin Sky Air R-407C Service Manual

ESIE02–01
Part 1 – System Outline
4.22

Piping Components

Components The table below contains the different components of the functional diagrams.
No. Component
1a Flare connection
1b Flange connection
2a Liquid stop valve
2b Liquid stop valve
with service port
3 Gas stop valve with
service port
4 Compressor
5a Capillary tube
5b
6 Electronic expan-
sion valve
7 Heat exchanger
8 Filter
9 Accumulator
10 Liquid receiver
11 Check valve with
service port
12 Low-pressure switch
13 High-pressure switch
14 Propeller fan and fan
motor
15a One-way valve
15b
16 4-way valve
(reversing solenoid
valve)
17 Muffler
18 Low pressure control
valve
19 Solenoid valve
20 Thermistor
Function / remark
See pipe connection diameter.
The liquid stop valve is used as shut-off valve in case of a pump-down.
The gas stop valve is used as shut-off valve in case of a pump-down.
The compressor can restart after 3 min from last stop.
The capillary tube allows pressure equalization during a compressor OFF-cycle.
The capillary tube expands the liquid to enable evaporation in the evaporator.
The expansion valve expands the liquid to enable evaporation in the evaporator. The opening
degree is controlled to obtain the optimum discharge temperature.
The heat exchanger is of the multi louvre fin type. Hi-X -tubes and coated waffle louvre fins are
used.
The filter is used to collect impurities, which may enter the system during installation and is also
used to avoid blockage of the capillaries and other fine mechanical parts of the unit.
The accumulator is used to separate the gas from the liquid in order to protect the compressor
against liquid pumping.
The liquid receiver is used to make sure only completely liquefied refrigerant is sent to the expan-
sion valve. It is also used as a container in which surplus refrigerant is stored.
The check valve allows you to connect a gauge.
The low-pressure switch stops the operation of the unit when the pressure becomes abnormally
low.
The high-pressure switch stops the operation of the unit when the pressure becomes abnormally
high.
The propeller fan creates air displacement across the heat exhanger.
The one-way valve is used to force the refrigerant liquid to flow through the receiver and the
expansion valve in the same direction both in cooling and heating.
The one-way valve is used to release overpressure in the liquid receiver during stand-still.
The 4-way valve is used to select refrigerant flow in cooling or heating mode.
When the 4-way valve switches from ON to OFF, a timer starts counting up to 150 as soon as the
cooling or defrosting operation is stopped. This delay time is to eliminate the switching sound.
The muffler is used to absorb the refrigerant noise from the compressor.
Control to keep the low pressure > 4.3 bar
Y1S: Capacity control solenoid valve
Y3S: Liquid injection solenoid valve
—: Solenoid valve
R1T: Capacity control thermistor
R2T: Liquid injection thermistor
Part 1
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