Daikin EWAT021CZNAA1 Bruksanvisning

Daikin Luftkonditionering EWAT021CZNAA1

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Sida 1/52

Original Instructions

Public

REV

Date

04/2025

Supersedes

D-EIMHP01405-21_010EN

Installation, Operation and Maintenance Manual

Air to water heat pump units with scroll compressors

EWYT~CZ / EWAT~CZ

Installation, Maintenance and Operation Manual

D-EIMHP01405-21_11EN

D-EIMHP01405-21_11EN 2/52 
CONTENTS 
 
INTRODUCTION ..............................................................................................................................................................4 
1  Precautions against residual risks ...........................................................................................................................4 
2  General description ..................................................................................................................................................5 
3  Information about the refrigerant..............................................................................................................................5 
4  Installation information .............................................................................................................................................6 
RECEIPT OF THE UNIT...................................................................................................................................................8 
STORAGE ........................................................................................................................................................................9 
MECHANICAL INSTALLATION .....................................................................................................................................10 
1  Safety .....................................................................................................................................................................10 
2  Handling and lifting.................................................................................................................................................10 
2.1  Lifting the MONO unit .................................................................................................................................10 
2.2  Lifting the DUAL unit ...................................................................................................................................11 
3  Positioning and assembly ......................................................................................................................................12 
3.1  Mounting the main switch handle ...............................................................................................................16 
4  Minimum space requirements ................................................................................................................................16 
5  Additional installation site requirements.................................................................................................................18 
6  Noise and acoustic protection ................................................................................................................................19 
7  Water circuit for connection with the unit ...............................................................................................................20 
7.1  Water piping ................................................................................................................................................20 
7.2  Flow-switch .................................................................................................................................................20 
7.3  Heat recovery (optional) .............................................................................................................................21 
7.4  Preparing and checking the water circuit connection .................................................................................22 
7.5  Water pressure ...........................................................................................................................................22 
7.6  Hydraulic diagram .......................................................................................................................................22 
8  Water treatment .....................................................................................................................................................23 
9  Water pressure drops for filters ..............................................................................................................................24 
10 Pump kit mounted on board (Optional) ..................................................................................................................24 
11 Operation limits ......................................................................................................................................................25 
12 Operating stability and minimum water content in the system ..............................................................................27 
12.1 Cooling Mode..............................................................................................................................................27 
12.2 Heating Mode .............................................................................................................................................28 
13 Calibrating the expansion vessel ...........................................................................................................................28 
14 Antifreeze protection for BPHE and recovery exchangers ....................................................................................29 
ELECTRICAL INSTALLATION .......................................................................................................................................31 
1  General specifications ............................................................................................................................................31 
2  Electric connections ...............................................................................................................................................31 
3  Cable requirements ................................................................................................................................................31 
3.1  Maximum cable dimension .........................................................................................................................32 
3.2  Safety device requirements ........................................................................................................................33 
4  Phase unbalance ...................................................................................................................................................33 
OPERATION ...................................................................................................................................................................34 
1  Operator’s reponsibilities........................................................................................................................................34 
MAINTENANCE..............................................................................................................................................................35 
1  Pressure / temperature table .................................................................................................................................36 
2  Routine maintenance .............................................................................................................................................36 
2.1  Air Heat Exchanger Maintenance ...............................................................................................................37 
2.2  Electrical Installation ...................................................................................................................................37 
2.3  Service and limited warranty ......................................................................................................................37 
2.4  Refrigerant circuit scheme ..........................................................................................................................40 
LIST OF THE LABELS APPLIED TO THE UNIT ...........................................................................................................45 
COMMISSIONING ..........................................................................................................................................................47 
IMPORTANT INFORMATION ON THE REFRIGERANT USED ...................................................................................48 
PERIODIC CHECKS AND COMMISSIONING OF PRESSURE EQUIPMENT .............................................................49 
DISMISSION AND DISPOSAL .......................................................................................................................................50 
 
 