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EWAQ016~064BAW + EWYQ016~064BAW
Packaged air-cooled water chiller
4PW70082-1E – 2016.12
Installation and operation manual
12
8.9.6. Protecting the water circuit against freezing
Frost can cause damage to the hydraulic system. As this unit is
installed outdoors and thus the hydraulic system is exposed to
freezing temperatures, care must be taken to prevent freezing of the
system.
Optional water piping heater tape
Refer to "8.1. Check optional equipment" on page 6.
All hydraulic parts are insulated to reduce heat loss. Insulation must
be foreseen on the field piping.
A heater tape is winded around the piping to protect vital parts of the
hydraulic system inside the unit.
This heater tape will only protect internal parts of the unit. It can not
protect field installed parts outside the unit.
Field heater tape must be foreseen by the installer.
Use of glycol
Refer to "[8-04] Freeze-up prevention" on page 23.
Depending on the expected lowest outdoor temperature, make sure
the water system is filled with a weight concentration of glycol as
mentioned in the following table.
Caution: "Use of glycol"
Also refer to "9.3. Final check and test run" on page 24.
8.9.7. Fill the water circuit
1 Connect the water supply to the drain and fill valve (see
"7.3. Main components of the hydro module" on page 5).
2 Make sure the automatic air purge valve is open (at least
2turns).
3 Fill with water until the pressure gauge indicates a pressure of
approximately 2.0 bar. Remove air in the circuit as much as
possible using the air purge valves (refer to "[E-04] Pump only
operation (air purge function)" on page 24.
NOTICE
However, in case of power failure or if the power supply is
disconnected during winter, above mentioned option
cannot protect the unit from freezing.
If power failure can happen at times the unit is unattended,
if the power supply is disconnected during winter, or if you
did not select this option, Daikin recommends adding
glycol to the water system.
INFORMATION
The concentrations mentioned in the table below will
prevent the piping from bursting, but will not prevent the
liquid in the piping from freezing.
Minimum outdoor
temperature
Ethylene glycol Propylene glycol
–5°C 10% 15%
–10°C 15% 20%
–15°C 20% 35%
WARNING
ETHYLENE GLYCOL IS TOXIC
NOTICE
The above mentioned concentrations are applicable only
when the unit is at standstill.
CAUTION: Use of glycol
In case of over-pressure when using glycol, be sure to
connect the safety valve to a drain pan in order to
recover the glycol.
Connecting a drain pipe is not required if no glycol is
used. The discharged water is then drained via the
bottom of the unit.
Using more than 40% glycol will damage the unit.
NOTICE
Corrosion of the system due to presence of glycol
Uninhibited glycol will turn acidic under the influence of
oxygen. This process is accelerated by presence of copper
and at higher temperatures. The acidic uninhibited glycol
attacks metal surfaces and forms galvanic corrosion cells
that cause severe damage to the system.
It is therefore of extreme importance:
that the water treatment is correctly executed by a
qualified water specialist;
that a glycol with corrosion inhibitors is selected to
counteract acids formed by the oxidation of glycols;
that no automotive glycol is used because their
corrosion inhibitors have a limited lifetime and contain
silicates which can foul or plug the system;
that galvanized piping is not used in glycol systems
since its presence may lead to the precipitation of
certain components in the glycol’s corrosion inhibitor;
that it has to be made sure the glycol is compatible
with the used materials in the system.
INFORMATION
Be aware of the hygroscopic property of glycol: it absorbs
moisture from its environment.
Leaving the cap off the glycol container causes the
concentration of water to increase. The glycol
concentration is then lower than assumed. And in
consequence, freezing can happen after all.
Preventive actions must be taken to ensure minimal
exposure of the glycol to air.
INFORMATION
During filling, it might not be possible to remove all air
in the system. Remaining air will be removed through
the automatic air purge valves during first operating
hours of the system. Additional filling with water
afterwards might be required.
The water pressure indicated on the pressure gauge
will vary depending on the water temperature (higher
pressure at higher water temperature).
However, at all times water pressure should remain
above 1 bar to avoid air entering the circuit.
The unit might dispose some excessive water through
the pressure relief valve.
Water quality must be according to EU directive
98/83 EC.
NOTICE
If no glycol is in the system in case of a power supply
failure, power supply disconnection (during winter), or
pump operating failure, drain the system. When water is at
standstill inside the system, freezing is very likely to
happen and damaging the system in the process.
4PWEN70082-1E_2016_12.book Page 12 Wednesday, December 7, 2016 2:18 PM
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Productinformatie
| Merk | Daikin |
| Model | EWAQ-BAWP |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 9272 MB |
