Daikin EWAT016CZN-A1, Installation, Maintenance And Operation Manual

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DEIMHP0140521_00EN
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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.