Daikin FHC45BZ7V1, Service Manual

Page: 109 / 304

ESIE02–01
Part 1 – System Outline 1–93
Part 1
4.22 Piping Components
Components The table below contains the different components of the functional diagrams.
No. Component Function / remark
1a Flare connection See pipe connection diameter.
1b Flange connection
2a Liquid stop valve The liquid stop valve is used as shut-off valve in case of a pump-down.
2b Liquid stop valve
with service port
3 Gas stop valve with
service port The gas stop valve is used as shut-off valve in case of a pump-down.
4 Compressor The compressor can restart after 3 min from last stop.
5a Capillary tube The capillary tube allows pressure equalization during a compressor OFF-cycle.
5b The capillary tube expands the liquid to enable evaporation in the evaporator.
6 Electronic expan-
sion valve The expansion valve expands the liquid to enable evaporation in the evaporator. The opening
degree is controlled to obtain the optimum discharge temperature.
7 Heat exchanger The heat exchanger is of the multi louvre fin type. Hi-X -tubes and coated waffle louvre fins are
used.
8 Filter 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.
9 Accumulator The accumulator is used to separate the gas from the liquid in order to protect the compressor
against liquid pumping.
10 Liquid receiver 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.
11 Check valve with
service port The check valve allows you to connect a gauge.
12 Low-pressure switch The low-pressure switch stops the operation of the unit when the pressure becomes abnormally
low.
13 High-pressure switch The high-pressure switch stops the operation of the unit when the pressure becomes abnormally
high.
14 Propeller fan and fan
motor The propeller fan creates air displacement across the heat exhanger.
15a One-way valve 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.
15b The one-way valve is used to release overpressure in the liquid receiver during stand-still.
16 4-way valve
(reversing solenoid
valve)
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.
17 Muffler The muffler is used to absorb the refrigerant noise from the compressor.
18 Low pressure control
valve Control to keep the low pressure > 4.3 bar
19 Solenoid valve ■ Y1S: Capacity control solenoid valve
■ Y3S: Liquid injection solenoid valve
■
—: Solenoid valve
20 Thermistor
■
R1T: Capacity control thermistor
■
R2T: Liquid injection thermistor