Daikin EUWL KZW1 Series, Service Manual

Page: 49 / 140

ESIE-0303 Piping Layout
Part 1 – System Outline 1–41
3
1
4
5
Components
refrigeration side The table below describes the components.
No. Component Function / remark
1 Compressor A hermetically sealed scroll compressor.
2 Water-heat exchanger
(evaporator) The water-heat exchanger is of the brazed plate-heat exchanger
type.
3 Expansion valve The thermostatic expansion valve is set up to control the
superheat between 5°C and 7°C.
4 Low-pressure switch 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
5 High-pressure switch This switch acts as a circuit safety.
■ Standard setting: OFF = 30.9 bar +0/-1
■ Standard setting: ON = 21.6 bar ± 0.1
6 Strainer This strainer prevents dirt particles from entering the expansion
valve.
7 Water in- and outlet
connections 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.
8 Low-pressure
service port The low-pressure service port is used to connect a
low-pressure gauge.
9 sight glass with
moisture indicator
10 Water temperature
sensor The water temperature sensors are used to control the
thermostat function at the heat exchanger inlet.
11 Freeze-up sensor 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.
12 Accumulator The accumulator is used to prevent the liquid refrigerant from
entering the compressor.
13 Liquid solenoid valve The liquid solenoid valve prevents that the evaporator from filling
with liquid if the unit is switched off.