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The bypass pipes and stop valves of water inlet and outlet pipelines shown in the above diagram must be
installed to facilitate cleaning of other systems outside of the water pipeline prior to the unit commissioning.
During maintenance, the water pipelines of the heat exchanger may be cut off without interference to other heat
exchangers.
Overall Nozzle Dimensions during Module Combination
■
(Maximum 16 modules combined)
Number of
2
modules
Manifold pipe
65
dimensions (mm)
Calculations of Water System Inventory
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■
During unit operation, the actual operating capacity of the water system is less than the minimum water capacity
required, resulting in frequent alarm and shutdown of the unit.
Model of unit
Preset return water temperature (°C)
CA0035EAND
CA0070EAND
CA0100EAND
CA0130EAND
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The effective water capacity of the running water system includes the total capacity of the water main,
water tank, 2-way valve normally-open end which are involved in water circulation in the water system.
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The actual effective water capacity (V) of the running water system must be more than or equal to Vmin.,
otherwise the unit may be subject to frequent alarm or shutdown!
Calculation example of water system capacity
Assume that one wr system is paterovided with two sets of CA0070EAND units, and the preset return water
temperature is 12°C. The diameter of water main is DN65, and the total length of water inlet & outlet pipelines is
80m. Eight end fan coils are normally open. The internal capacity is 2L.
Calculations:
Capacity of inlet & outlet water mains = 3.14 x {(65/2)/1000}2 X 80 X 10
Water capacity of end fan coil = 10 x 2 = 20L
The above table indicates that the required minimum capacity of the water system Vmin.=310L
To avoid frequent startup, shutdown and alarm of the unit, the capacity of water tank must be more than or equal
to Vmin.=310-265-20=25L
3
4
5
6
80
100
125
12
12
12
12
CAUTION
7
8
9
10
11
150
CAUTION
Minimum effective water capacity Vmin. (L)
CAUTION
3
= 265L
25
12
13
14
15
200
250
155
310
465
620
16
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