15 20 25 30 35 40 45
7 6,1 5,8 5,5 5,3 5,0 4,7 4,4
9 6,5 6,2 5,9 5,6 5,3 5,0 4,7
11 7,0 6,7 6,4 6,0 5,7 5,4 5,0
-6 0 6 12 18
35 4,5 5,5 6,5 7,5 8,5
50 4 5 6 7 8
34
3.2.- CHECKING THE WATER FLOW RATE
It is very important that the unit operates at the correct water ow rate. It is dangerous to leave the unit operating at a low ow
rate as this could result in serious damage to components as well as the water exchanger. If the unit operates at too high a
ow rate, this will also hinder optimum performance. The best way of determining the operating ow rate is to measure the
temperature difference between the inlet and water outlet.
Checking the water ow rate (it is vital to measure the thermal peak) (Standard unit)
For nominal and minimum water ow the difference between the inlet and water outlet temperature should be 5ºC (cooling
and heating pump units in cooling cycle only) for an inlet temperature of 12°C, an outlet temperature of 7°C and an outside
temperature of 35°C. If these conditions change, the unit capacity will also change and as a result for nominal ow the
difference between the inlet and water outlet temperature will vary slightly from 5ºC as can be seen in the following table, based
on nominal ow rate.
∆T (Water inlet temperature - Water outlet temperature)
Outside temperature ºC
Water output ºC
If the unit must be started in the heating cycle and if you wish to operate at nominal cooling rate, the following shows the
approximate differences between the inlet and water outlet temperatures for the various conditions.
∆T ( Water inlet temperature - Water outlet temperature)
Outside Temperature ºC BH
Water output ºC
Note:
The unit control system displays the inlet and water outlet temperature to be displayed. See the Control Description section.
Check that the correct water pump has been selected, taking into account the loss of pressure in the hydraulic system. It is
dangerous to let the unit run at a low rate and any faults which may result will not be covered under warranty.
Do not start up the air conditioning units or the fan coils until the water temperature reaches the set temperature or use an
automatic control device which cancels the air conditioning unit operation if the installation is not properly set.
When everything is operating normally, take a reading of all the data and ll out the Commissioning Sheet.
3.- COMMISSIONING AND OPERATION
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