Venkon EC 115 V
48
48
Installation and Connection
Hydraulic Connections
6.8 Hydraulic Connection
Design for the use of units operated with CHW:
- The dimensions of the system may need to be modified. The
water volume is generally higher than with heating networks .
The normal temperature spread is around 6 K .
- Hydraulic shortcomings by the design, choice of distributor
system and poor hydraulic balancing are much more
noticeable than with hot water systems and are difficult to
detect and correct .
- The effective outputs have to be precisely tailored to actual
conditions of use . Take into consideration the possible rise
in temperature of the cooling medium, particularly along
long lengths of pipework. (For example: Temperature at
the generator 6/12 °C, temperature at the consumer 8/14 °C,
therefore loss of output)
- Check the suitability of all components (such as circulation
pumps etc .) for the use of CHW, noting the minimum
temperatures .
- The addition of anti-freeze has an adverse effect, for instance
it reduces cooling output at the generator and consumer
by impairing heat transfer / higher pressure losses in the
pipework by the lower viscosity of the cooling medium; the
consequence is higher pump capacity:
Design:
Note the following points in the design:
- Fit end-to-end, vapour-impermeable insulation on all water-
carrying components (pipes, valves, fittings) right up to the
unit (ensuring that the insulation goes as far as the disc under
the valves and ensuring that the insulation is adhered by the
condensate tray to the drip plate) .
- Select suitable pipe brackets for cooling mode (chilled clamps)
- Install and check safety-related components (e .g . expansion
tanks, relief and overflow valves)
- Allow adequate space for the air flow (air inlet and outlet)
- Position cooling unit to fit in with fittings and interior
architecture
- Make sure that any condensate produced can drain
away freely; check the free area of the condensate drain
connection/run condensate line along a gradient, without
bends or restrictions, to the on-site waste water line
- Size dimension of condensate line appropriately
- Protect traps (if fitted) in the condensate line from drying out
(possibly by the use of a ball trap)
- Use condensate pumps, noting the maximum delivery height,
if there is no natural gradient
Fig. 32: 2-pipe system:
Fig. 33: 4-pipe system:
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