Checking The Water Flow Rate - Lennox ECOLEAN EAC 0091 S Installation, Operating And Maintenance

3.- COMMISSIONING AND OPERATION

3.2.- CHECKING THE WATER FLOW RATE

It is very important that the unit operates at the correct water flow rate. It is dangerous to leave the unit operating at
a low flow rate as this could result in serious damage to components as well as the water exchanger. If the unit
operates at too high a flow rate, this will also hinder optimum performance. The best way of determining the operating
flow rate is to measure the temperature difference between the inlet and water outlet.
Checking the water flow rate (it is vital to measure the thermal peak) (Standard unit)
For nominal and minimum water flow 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 flow 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 flow rate.
Water output ºC
7
9
11
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.
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 fill out the Commissioning Sheet.
T (water inlet temperature - water outlet temperature)
15 20
6,1 5,8
6,5 6,2
7,0 6,7
Water output ºC
35
50
Outside temperature ºC
25 30
5,5 5,3
5,9 5,6
6,4 6,0
T ( water inlet temperature - water outlet temperature)
Outside temperature ºC W.B.
-6 0
4,5 5,5
4 5
34
35 40
5,0 4,7
5,3 5,0
5,7 5,4
6 12
6,5 7,5
6 7
45
4,4
4,7
5,0
18
8,5
8