EAS ELECTRIC ECH Serie Manual De Instalación página 66

4.3 Design of the tank in the system
kW is the unit for cooling capacity and L is the unit for G
water flow in the formula counting the minimum water flow.
Comfortable type air conditioner
G= cooling capacity×2.6L
Process type type cooling
G= cooling capacity×7.4L
In certain occasion (especially in manufacture cooling
process), for conforming the system water content requirement,
it's necessary to mount a tank equipping with a cut-off baffle at the
system to avoid water short-circuit, Please see the following
schemes:
4.4 Minimum chilled water flow
The minimum chilled water flow is shown in the table 4-1
If the system flow is less than the minimum unit flow rate,
the evaporator flow can be recirculated, as shown in the
diagram.
For minimum chilled water flow rate
Recirculation
4.5 Maximum chilled water flow
The maximum chilled water flow is limited by the permitted
pressure drop in the evaporator. It is provided in the table 4-1
If the system flow is more than the maximum unit flow rate,
bypass the evaporator as shown in the diagram to obtain a lower
evaporator flow rate.
For maximum chilled water flow rate
Evaporator
Recirculation
V.2
Evaporator
Fig. 4-2
Fig. 4-3
4.6 Minimum and Maximum water flow rates
Table 4-1
Item
Model
Minimum
ECH-030NVTBI
ECH-060NVTBI
Error
Error
4.7 Selection and installation of the pump
4.7.1 Select the pump
a. Select the water-flow of the pump
The rated water-flow must no less than the unit rated water-flow;
in terms of multi-connect the units, that water-flow must no less
than total units' rated water-flow.
b. Select the left of the pump.
H=h1+h2+h3+h4
H: The lift of the pump.
h1: Main unit water resistance.
h2: Pump water resistance.
h3: Water resistance of the longest water-loop distance,
includes: pipe resistance, different valve's resistance, flexible
pipe resistance, pipe elbow and three-way resistance, two-way
resistance or three-way resistance, as well as filter resistance.
H4: the longest terminal resistance.
4.7.2 Installation the pump
a. The pump should be installed at the water inlet pipe, both of
which sides must mount the soft connectors for vibration-proof.
b. The backup pump for the system (recommended).
c. Units must with a main unit controls (Please see Fig. 5-3 for
the controls wiring diagram).
Waterflow rate(m 3 /h)
Maximum
3.8 6.4
8.0 13.0
Recommendation
Fig.4-4
9