Daikin EUWAC8FZW1, Installation And Operation Manual

Installation and operation manual

5

EUWAC5~10FZ

Packaged air-cooled water chillers

4PW14037-1D

O

PERATING

THE

UNIT

I

NTRODUCTION

This manual has been prepared to ensure adequate operation and
maintenance of the unit. It will tell you how to use the unit properly
and will provide help if problems occur. The unit is equipped with
safety devices, but they will not necessarily prevent all problems
caused by improper operation or inadequate maintenance. 

In case of persisting problems contact your local Daikin Dealer.

D

ESCRIPTION

The EUWAC packaged air-cooled water chillers are available in 3
standard sizes with nominal cooling capacities ranging from 11.2 to
22.6 kW. Each size is available in three phase 400 V+N 50 Hz.

(See figure 4)

Function of the main components 

(See figure 5)

As the refrigerant circulates through the unit, changes in its state or
condition occur. These changes are caused by the following main
components:

■

Compressor
The compressor (M1C) acts as a pump and circulates the
refrigerant in the refrigeration circuit. It compresses the
refrigerant vapour coming from the evaporator at the pressure at
which it can easily be liquefied in the condenser.

■

Condenser
The function of the condenser is to change the state of the
refrigerant from gaseous to liquid. The heat gained by the gas in
the evaporator is discharged through the condenser to the
ambient air, and the vapour condenses to liquid. One fan
(EUWAC5) or two fans (10) are used to accelerate
this process.

■

Filter
The filter installed behind the condenser removes small particles
from the refrigerant to prevent blockage of the expansion valve
and tubes. 

■

Thermostatic expansion valve
The liquid refrigerant coming from the condenser enters the
evaporator via a thermostatic expansion valve. The valve
maintains a constant degree of suction superheat at the
evaporator outlet in order to ensure a maximum liquid refrigerant
has turned into gas.

■

Evaporator
The main function of the evaporator is to take heat from the
water that flows through it. This is done by turning the liquid
refrigerant, coming from the condenser, into gaseous
refrigerant.

■

Water in/outlet connection
The water inlet and outlet connections allow an easy connection
of the packaged air-cooled water chiller to the water circuit of the
air handling unit or industrial equipment.

Before starting up the unit for the first time, make sure that
it has been properly installed. It is therefore necessary to
carefully read the chapter 

"Installing the unit" on page 1

and the recommendations listed in 

"Checks before initial

start-up" on page 7

.

1

Compressor (M1C)

2

Condenser coil

3

Condenser fan with motor (M11F) (only for EUWAC5)

4

Condenser fan (only for 10)

5

Condenser motor (M11F) (only for 10)

6

High pressure gauge

7

Low pressure gauge

8

Drier/filter

9

Thermostatic expansion valve

10

Evaporator

11

Water inlet connection

12

Water outlet connection

13

Switch box

14

Low-pressure switch (S4LP)

15

High-pressure switch (S1HP)

16

Digital controller

1

Compressor

2

Condenser

3

Evaporator

4

Expansion valve

5

Filter

6

Low pressure switch

7

High pressure switch

8

Water inlet temperature sensor

9

Water outlet temperature sensor

10

Condenser fan motor