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O&I manual
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.
4.4 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.
4.3 Minimum chilled water flow
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).
Error
Recommendation
Fig.4-4
Error
Recommendation
a. 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 cooling
G= cooling capacity×7.4L
b. In certain occasion (especially in manufacture cooling
process), for conforming the system water content require-
ment, 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:
4.6 Design of the tank in the system
For maximum chilled water flow rate
Evaporator
Recirculation
For minimum chilled water flow rate
Fig. 4-2
4.5 Minimum and Maximum water flow rates
Evaporator
Recirculation
Fig. 4-3
Table 4-1
Water flow rate(m
3
/h)
Maximum
Minimum
Item
Model
18.54
ICHS-420KC-5
22.66
Summary of Contents for ICHS-420KC-5
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