M03I40M7-03 15/11/07 page 26
EVAPORATOR WATER FLOW RATE
Check that the difference between the temperature of
exchanger return and supply water corresponds to power
according to this formula:
unit cooling power (kW) x 860 = Dt (°C) x flow rate (L/h).
The cooling power is shown in the TABLE ON GENERAL
TECHNICAL DATA included in this manual, referred to
specific air/water conditions, or in the tables on cooling
PERFORMANCE IN THE TECHNICAL BULLETIN referred
to various conditions of use.
Check for water side exchanger pressure drops:
• Determine the water flow rate.
• Measure the difference in pressure between
exchanger input and output and compare it with the
graph on WATER SIDE EXCHANGER PRESSURE
DROPS.
The measurement of pressure will be easier if pressure
gauges are installed as indicated in the DIAGRAM OF
SUGGESTED WATER CONNECTIONS .
CONDENSER WATER FLOW RATE
Check that the difference between the temperature of
exchanger return and supply water corresponds to power
according to this formula:
unit cooling power + power absorbed by compressors (kW)
x 860 = Dt (°C) x flow rate (L/h).
The data is shown in the table on GENERAL TECHNICAL
DATA included in this manual, referred to specific air/water
conditions, or in the tables on COOLING PERFORMANCE
in the TECHNICAL BULLETIN referred to various
conditions of use.
Check for water side exchanger pressure drops:
• Determine the water flow rate.
• Measure the difference in pressure between
exchanger input and output and compare it with the
graph on WATER SIDE EXCHANGER PRESSURE
DROPS.
The measurement of pressure will be easier if pressure
gauges are installed as indicated in the DIAGRAM OF
SUGGESTED WATER CONNECTIONS.
REFRIGERANT CIRCUIT PARAMETER CHECK
Detecting the operational conditions is useful to control the
unit along time: the performed records must be kept and be
available during maintenance interventions.
When the unit works in stable conditions and according to
the operating limits, take note of the following data:
1. compressor diacharge temperature (WARNING –
BURN DANGERI)
2. condensing pressure
3. liquid temperature
4. dehydrator filter upstream and downstream
temperature
5. return pressure
6. return temperature
7. exchanger input water temperature
8. exchanger output water temperature
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