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DEIMHP0140521_00EN

16

EWYT~CZ / EWAT~CZ

b

 

Maximum water volume [L]

A

 

Circuit without glycol

B

 

Circuit with 30% ethylene glycol

C

 

Circuit with 40% ethylene glycol

D

 

Circuit with 30% propylene glycol

E

 

Circuit with 40% propylene glycol

F

 Default

The default value for initial pressure, shown in the figure, refers to a 
difference in H of 7 metres.

If the total water volume in the entire circuit exceeds the permitted 
maximum volume, another expansion vessel must be installed. If the 
difference in system H is less than 7 metres and the initial pressure 
reading is lower than the maximum permitted value (refer to the 
graph), no adjustment of initial pressure is required.

If it is necessary to change the default initial pressure value (1 bar), 
take the following recommendations into consideration:

•  Use dry nitrogen only to set the initial pressure in the expan-

sion vessel.

•  An inappropriate initial pressure setting in the expansion ves-

sel will result in malfunctioning of the system.

Changes to the initial pressure of the expansion vessel must be made 
by reducing or increasing nitrogen pressure using the Schrader valve 
on the expansion vessel.

NOTICE
Only an authorised installer can adjust the initial pressure of the 
expansion vessel.

To check water volume: examples

Example 1

The unit is installed 5 m below the highest point in the water circuit. 
The total water volume in the water circuit is 250 litres. No actions or 
changes required.

Example 2

The unit is installed at the highest point in the water circuit. The total 
water volume in the water circuit (without the glycol) is 420 l.

Actions:

As the total water volume (420 l) is higher than the preset water volume 
(340 l), prepressure must be reduced.

The required prepressure is:

Pg = (0.3+ (H / 10)) bar = (0.3+ (0/10)) bar = 0.3 bar

The corresponding maximum water volume is about 490 l (see graph).

As 420 l is less than 490 l, the expansion vessel is appropriate for the 
installation.

4.14. Antifreeze protection for BPHE and recovery 

exchangers

If the heat exchangers are completely empty and cleaned with 
antifreeze solution, additional methods can be used against freezing.

The following protection methods must be considered when 
designing the system as a whole:

1. 

continuous water flow circulation inside piping and exchangers;

2. 

addition of an appropriate amount of glycol inside the water cir-
cuit or, as alternative, an additional heat insulation and heating of 
exposed piping (internal and external to the unit);

3. 

if the unit does not work during the winter season, emptying and 
cleaning of the heat exchanger.
It is the responsibility of the installer and/or of local maintenance 
personnel to ensure that described antifreeze methods are used. 
Make sure that appropriate antifreeze protection is always 

maintained. Failing to follow the instructions above could result 
in unit damage.

4. 

ELECTRIC HEATER (Option on request). A heater tape is instal-
led on the water side components (the plates heat exchanger 
and the expansion vessel) to protect vital parts of the hydraulic 
system inside the unit.This heater tape will only protect internal 
parts of the unit. It cannot protect field installed parts outside the 
unit. Field heater tapes must be provided by the installer.

Damage caused by freezing is excluded from the warranty, 
therefore Daikin Applied Europe S.p.A. declines all 
responsibility

5.  eLeCtriCaL instaLLation

5.1. General specifications

Refer to the specific wiring diagram for the unit you have bought. 
Should the wiring diagram not be on the unit or should it have been 
lost, please contact your manufacturer representative, who will send 
you a copy.

In case of discrepance between wiring diagram and electrical panel/
cables, please contact the manufacturer representative.

All electrical connections to the unit must be carried out in 
compliance with laws and regulations in force.

All installation, management and maintenance activities 
must be carried out by qualified personnel.

There is a risk of electric shock and burning.

Electrical equipment is capable of operating correctly in the intended 
ambient air temperature. For very hot/cold environments (refer to 
4.11, “Operation limits”), additional measures are recommended 
(contact the manufacturer representative).

The electrical equipment is capable of operating correctly when the 
relative humidity does not exceed 50% at a maximum temperature of 
+40 °C. Higher relative humidities are permitted at lower temperatures 
(for example 90% at 20 °C).

5.2. Electric connections

Provide an electrical circuit to connect the unit. It must be connected 
to the copper cables with an adequate section relative to the 
absorption values and according to the current electrical standards.

Daikin Applied Europe S.p.A. declines all responsibility for an 
inadequate electrical connection.

The connections to the terminals must be made with 
copper terminals and cables, otherwise overheating or 
corrosion may occur at the connection points with the risk 
of damaging the unit. The electrical connection must be 
carried out by qualified personnel, in compliance with the 
laws in force. There is a risk of electric shock.

The power supply to the unit must be set up in such a way that it can 
be switched on or off independently from that of other system 
components and other equipment in general, by means of a general 
switch.

The electrical connection of the panel must be carried out maintaining 
the correct sequence of the phases. Refer to the specific wiring 
diagram for the unit you have bought. In case of discrepancy between 
the wiring diagram and electrical panel/cables, please contact the 
manufacturer representative.

Содержание EWAT016CZN-A1

Страница 1: ...REV 00 Date 04 2021 Supersedes Installation Maintenance and Operation Manual DEIMHP0140521_00EN Air to water heat pump units with scroll compressors EWYT CZ EWAT CZ...

Страница 2: ......

Страница 3: ...RESSURE EQUIPMENT 27 12 DISMISSIONAND DISPOSAL 27 List of tables Table 1 Physical properties of R32 refrigerant 5 Table 2 Minimum glycol percentage for low ambient air temperature 11 Table 3 Flow Swit...

Страница 4: ...to check possible refrigerant leaks 13 Disable the unit from the mains using the main switch before opening the control panel 14 Check that the unit has been grounded correctly before starting it 15...

Страница 5: ...pagation rate is low and nontoxic R32 refrigerant can burn slowly when all the following conditions are present The concentration is between the lower and upper flammability limit LFL UFL Wind velocit...

Страница 6: ...it contacts the duct material n Airflow of the emergency mechanical ventilation shall be at least V 0 014 m Where V is air flow in m s m is the amount of refrigerant present in the machine room in kg...

Страница 7: ...osphere may damage electrical components 4 MECHANICAL INSTALLATION 4 1 Safety Before installation and commissioning of the machinery the people involved in this activity must have acquired the informa...

Страница 8: ...outdoors either on balconies or on the ground provided that the installation area is free of obstacles that could reduce air flow to the condensers coil The unit must be installed on a robust and per...

Страница 9: ...y side of the unit must be accessible for postinstallation maintenance operations and vertical air discharge must not be obstructed Figure below shows the minimum space required Figure 4 DUAL unit Whe...

Страница 10: ...the main wind direction Frontal wind will disturb the operation of the unit If necessary use a screen to block the wind Ensure that water cannot cause any damage to the location by adding water drains...

Страница 11: ...ition The water filter must be installed as close as possible to the unit If the water filter is installed in another part of the water system the Installer must guarantee the cleaning of the water pi...

Страница 12: ...Z P H A2 2 43 6 00 Table 4 Operating limits 4 7 3 Preparing and checking the water circuit connection The units have water inputs and outputs for connecting the heat pump to water circuit of the syste...

Страница 13: ...300 CO2 Sulphate ion mg SO4 2 l 100 Alkalinity mg CaCO3 l 200 Total Hardness mg CaCO3 l 75 150 Iron mg Fe l 0 2 Ammonium ion mg NH4 l 0 5 Silica mg SiO2 l Chlorine molecular mg Cl2 l 0 5 Note 1 Heat P...

Страница 14: ...ater temperature Ref 1 Unit operations in this area require OP 192 HIGH AMBIENT TEMPERATURE KIT Ref 2 Unit operations in this area require the enabling of the Brine version in the controller and the u...

Страница 15: ...t to have a water temperature difference of 2 5 K which allows it to operate with the minimum volume mentioned in the previous table However if a smaller temperature differential is set as in the case...

Страница 16: ...appropriate antifreeze protection is always maintained Failing to follow the instructions above could result in unit damage 4 ELECTRIC HEATER Option on request A heater tape is instal led on the water...

Страница 17: ...d the earth according to IEC 614391 table 1 and 2 and to the local national laws The cables connected to the main switch must be tightened using a pair of keys and respecting the unified clamping valu...

Страница 18: ...ompressors must be carried out exclusively by qualified personnel Sharp edges and the surface of the condenser section could cause injury Avoid direct contact and use adequate pro tection device Do no...

Страница 19: ...t maintenance could degrade all parts of the units coils compressors frames pipes etc with negative effect on performances and functionality There are two different levels of maintenance which can be...

Страница 20: ...trical problem has been solved 4 No safety device either mechanical electrical or electronic must be disabled or overridden 5 The water used for filling the water circuit must be clean and sui tably t...

Страница 21: ...X Check the safety valve X Coil section Checking the cleaning of the air heat exchanger Note 6 X Check the cleaning of water heat exchangers Note 6 X Verify that fans are well tightened X Verify coil...

Страница 22: ...CZ 7 2 4 Refrigerant circuit scheme Figure 17 Refrigerant circuit P ID diagram for MONO circuit EWYT CZ unit REFRIGERANT PED GROUP LINE PS bar Ts C R32 1 HIGH PRESSURE GAS 42 9 10 120 HIGH PRESSURE LI...

Страница 23: ...IMHP0140521_00EN 23 Figure 18 Refrigerant circuit P ID diagram for MONO circuit EWAT CZ unit REFRIGERANT PED GROUP LINE PS bar Ts C R32 1 HIGH PRESSURE GAS 42 9 10 120 HIGH PRESSURE LIQ 42 9 10 65 LOW...

Страница 24: ...24 EWYT CZ EWAT CZ Figure 19 Refrigerant circuit P ID diagram for DUAL circuit EWYT CZ unit REFRIGERANT PED GROUP LINE PS bar Ts C R32 1 HIGH PRESSURE GAS 42 9 10 120 HIGH PRESSURE LIQ 42 9 10 65 LOW...

Страница 25: ...nd outlet are indicative Please refer to the machine dimensional diagrams for exact water connections The series is composed by mono one circuit and dual two circuits reversible unit Legend Item Descr...

Страница 26: ...raulic circuit Check the oil level in the compressors Chilled Water Yes No N A Piping complete Water System filled and vented Pumps installed operational rotation checked Strainers installed and clean...

Страница 27: ...nd III of the classification established by the European Directive 2014 68 EU PED For units belonging to these categories some local regulations require a periodic inspection by an authorized person P...

Страница 28: ...Notes...

Страница 29: ...y is given for the completeness accuracy reliability of its contents All data and specifications contained therein may be subject to change without notice Refer to the data communicated at the time of...

Страница 30: ...DEIMHP0140720_00EN 2021 04 Via Piani di Santa Maria 72 00072 Ariccia Roma Italy Tel 39 06 93 73 11 Fax 39 06 93 74 014 http www daikinapplied eu...

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