Daikin EWYQ080DAYN, Installation Manual

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Installation manual
4
EWYQ080~250DAYN
Packaged air-cooled water chillers
4PW35559-1D – 03.2011
I
MPORTANT INFORMATION REGARDING THE
REFRIGERANT USED
This product contains fluorinated greenhouse gases covered by the
Kyoto Protocol. Do not vent gases into the atmosphere.
Refrigerant type: R410A
GWP
(1)
value: 1975
(1)
GWP = global warming potential
The refrigerant quantity is indicated on the unit name plate.
C
HECKING THE WATER CIRCUIT
The units are equipped with a water inlet and water outlet for
connection to a water circuit. This circuit must be provided by a
licensed technician and must comply with all relevant European and
national regulations.
Before continuing the installation of the unit, check the following
points:
Only for EWYQ*DAYN
(without option OPSP, OPTP or OPHP)
■
A circulation pump must be provided in such a way that it
discharges the water directly into the water heat exchanger.
■
Provide adequate safeguards in the water circuit to make sure
that the water pressure will never exceed the maximum
allowable working pressure (10 bar).
■
Shut-off valves must be provided at the unit so that normal
servicing can be accomplished without draining the system.
For all models
■
Drain taps must be provided at all low points of the system to
permit complete drainage of the circuit during maintenance or in
case of shut down. A drain plug is provided to drain the water
from the chiller water system.
■
Air vents must be provided at all high points of the system. The
vents should be located at points which are easily accessible for
servicing. An automatic air purge is provided on the chiller water
system.
■
Take care that the components installed in the field piping can
withstand at least the sum of opening pressure of the safety
valve + the static height of the pump.
C
ONNECTING THE WATER CIRCUIT
Water connections must be made in accordance with the outlook
diagram delivered with the unit, respecting the water in- and outlet.
If air, moisture or dust gets in the water circuit, problems may occur.
Therefore, always take into account the following when connecting
the water circuit:
1 Use clean pipes only.
2 Hold the pipe end downwards when removing burrs.
3 Cover the pipe end when inserting it through a wall so that no dust
and dirt enter.
W
ATER CHARGE
,
FLOW AND QUALITY
For all models
To assure proper operation of the unit a minimum water volume is
required in the system and the water flow through the evaporator
must be within the operation range as specified in the table.
■
Cooling mode
■
Heating mode
Only for models with option OPSP, OPTP or OPHP
Maximum allowed installation height in function of the water
volume
Make sure to respect following limitations:
If the EWYQ unit is installed at the highest point of the system, then
there is no height difference to be considered.
If the EWYQ unit is placed on a height level other than the highest
point, refer to the figure in
"Charging water" on page 5 to read the
maximum allowed height difference in function of the water volume.
■
e.g. for EWYQ080~210: If water volume=650 l, the maximum
allowed installation height difference is 9 m.
■
e.g. for 250: If water volume=650 l, the maximum
allowed installation height difference is 13 m.
Setting the pre-pressure of the expansion vessel
The pre-pressure (Pg) on the expansion vessel has to be set before
filling the system with water or water/glycol solution in function of the
maximum installation height difference (H).
Use dry compressed air or nitrogen for this operation.
The pre-pressure (Pg) to be set is calculated as below:
Pg= (H/10+0.3) bar
H= Maximum installation height of the circuit above the EWYQ unit (m)
Be careful not to deform the unit piping by using excessive
force when connecting the piping. Deformation of the
piping can cause the unit to malfunction.
Unit
Minimum
water volume (l)
(*)
(*) a = cooling temperature difference (refer to "Defining the thermostat
settings" on page 11 )
Minimum
water flow
Maximum
water flow
EWYQ080 690/a 110 l/min 441 l/min
EWYQ100 896/a 143 l/min 573 l/min
EWYQ130 609/a 195 l/min 780 l/min
EWYQ150 649/a 208 l/min 831 l/min
EWYQ180 820/a 262 l/min 1049 l/min
EWYQ210 945/a 302 l/min 1210 l/min
EWYQ230 1030/a 330 l/min 1319 l/min
EWYQ250 1120/a 358 l/min 1433 l/min
Unit
Minimum
water volume (l)
(*)
(*) a = heating temperature difference (refer to "Defining the thermostat
settings" on page 11 )
Minimum
water flow
Maximum
water flow
EWYQ080 786/a 126 l/min 503 l/min
EWYQ100 1021/a 163 l/min 654 l/min
EWYQ130 667/a 214 l/min 854 l/min
EWYQ150 739/a 237 l/min 946 l/min
EWYQ180 891/a 285 l/min 1141 l/min
EWYQ210 1008/a 323 l/min 1290 l/min
EWYQ230 1120/a 358 l/min 1433 l/min
EWYQ250 1232/a 394 l/min 1577 l/min
EWYQ 080~210 230+250
Volume expansion vessel 35 l 50 l
NOTE
■
For EWYQ080~210: If H
≤
12 m and the water
volume
≤
520 l, we recommend not to change the
factory setting of the pre-pressure (= 1.5 bar)
■
For 250: If H
≤
12 m and the water
volume
≤
750 l, we recommend not to change the
factory setting of the pre-pressure (= 1.5 bar)