Daikin EUWL KZW1 Series Service Manual page 46

Piping Layout
1 1
Components
refrigeration side
3
4
5
1–38
The table below describes the components.
No. Component
1 Compressor
2 Water-heat exchanger
(evaporator))
3 Expansion valve
4 Low-pressure switch
5 High-pressure switch
6 Strainer
7 Water in- and outlet
connections
8 Low-pressure
service port
9 Sight glass with
moisture indicator
10 Water temperature
sensor
11 Freeze-up sensor
12 Accumulator
13 Liquid solenoid valve
Function / remark
A hermetically sealed scroll compressor.
The water-heat exchanger is of the brazed plate-heat exchanger
type.
The thermostatic expansion valve is set up to control the
superheat between 5°C and 7°C.
This switch acts as a circuit safety.
■ Standard setting: OFF = 1.2 bar ± 0.2
■
Standard setting: ON = 2 bar ± 0.3
■ ZL/ZH setting: OFF = 0.5 bar ± 0.2
■
ZL/ZH setting: ON = 1.5 bar ± 0.3
This switch acts as a circuit safety.
■
Standard setting: OFF = 30.9 bar +0/-1
■ Standard setting: ON = 21.6 bar ± 0.1
This strainer prevents dirt particles from entering the expansion
valve.
The water in- and outlet connections are made of galvanized
steel pipe (British Standard Pipe - BSP). The pipes are not
insulated.
If copper field piping is used for the water circuit, then precau-
tion should be taken to prevent electrolytic corrosion.
The low-pressure service port is used to connect a
low-pressure gauge.
The water temperature sensors are used to control the
thermostat function at the heat exchanger inlet.
This protection device shuts down the circuit when the tempera-
ture of the chilled water becomes too low in order to prevent the
water from freezing during operation.
The accumulator is used to prevent the liquid refrigerant from
entering the compressor.
The liquid solenoid valve prevents that that the evaporator fills
up with liquid if the unit is switched off.
ESIE-0303
Part 1 – System Outline