Piping Diagrams; Piping Symbol - Daikin SkyAir Service Manual

Piping Diagrams

3. Piping Diagrams

3.1

Piping Symbol

Components The table below contains the different components of the piping diagrams.
246
No. Component
1 Flare connection
2 Liquid stop valve
Gas stop valve with
3
service port
4 Compressor
5 Capillary tube
Electronic
6
expansion valve
7 Heat exchanger
8 Filter
9 Liquid receiver
Check valve with
10
service port
Low-pressure
11
sensor
High-pressure
12
switch
Propeller fan and
13
fan motor
14 One-way valve
4-way valve
15 (reversing solenoid
valve)
16 Muffler
17 Solenoid valve
18 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 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 liquid receiver is used to make sure only completely liquefied
refrigerant is sent to the expansion 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 sensor is used to control the unit's actuators
(expansion valve, frequency,...)
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 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.
Y1S: Capacity control solenoid valve
Y3S: Liquid injection solenoid valve
SV: Solenoid valve (Purge liquid receiver)
R1T: Air thermistor
R2T: Coil thermistor
R3T: Discharge pipe thermistor
SiBE28-804
Appendix