Daikin EUWAC5FZW Сервис мануал онлайн [209/264] 524370

Daikin EUWAC5FZW Сервис мануал онлайн [209/264] 524370
Pre-Test Run Checks ESIE-0302
4–6 Part 4 – Commissioning and Test Run
3
1
4
5
(1)
: a is the steplength.
The water pressure should not exceed the maximum working pressure of 10 bar.
Calculation of the
minimum water
volume
The calculation method below is based on the fact that the water volume in a chiller should be large
enough to prevent the compressor from excessive cycling. Sufficient water volume gives a certain
inertia to the system, so that:
Water (or glycol) temperature does not drop too fast when the unit turns ON.
Water (or glycol) temperature does not rise too fast when the unit turns OFF.
with:
Water quality The table below contains the required water quality specifications.
EUWY*20KZW1 100 l 75 l/min 275 l/min
EUWY*24KZW1 119 l 89 l/min 309 l/min
Chiller type
Minimum water volume
Minimum water flow Maximum water flow
Notation Dimension Description Default
V
[m
3
]
Required system volume
Q [W] Cooling capacity at the lowest capacity
step of each chiller in the system
t [s] Minimum cycling time allowed by the com-
pressor
240 s
ρ
[kg/m
3
]
Specific mass of the fluid
ρ
water
= 1000 kg/m
3
d [K] Thermostat step difference d
inlet water control
= 3 K
C
w
[J/kgK] Specific heat capacity of the fluid C
w, water
= 4186 J/kgK
0,5 x Q x t
V = [m
3
]
2 x
ρ x d x C
w
Evaporator water Heated water (low temperature)
Tendency if out of
criteria
Circulating
water (< 20˚C)
Supply water Circulating water
(20˚C-60˚C)
Supply water
Items to be checked
pH at 25˚C 6.8~8.0 6.8~8.0 7.0~8.0 7.0~8.0 Corrosion + scale
Electrical conductivity mS/m
(at 25˚C)
< 40 < 30 < 30 < 30 Corrosion + scale
Chloride ion
mg Cl
-
/l
< 50 < 50 < 50 < 50 Corrosion
Sulphate ion
mg SO
4
2-
/l
< 50 < 50 < 50 < 50 Corrosion
M-alkalinity (pH 4.8) mg CaCO
3
/l < 50 < 50 < 50 < 50 Scale
Total hardness mg CaCO
3
/l < 70 < 70 < 70 < 70 Scale

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