Trane CCE-Compact Series, Установка, эксплуатация и обслуживание, Страница: 50 / 115

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8.1.2 Heat exchanger
The heat exchangers, fittings and valves shall be tested for tightness.
Water heat exchangers
Normal heating, cooling coils filled with water and additives for freeze and corrosion protection:
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Open vent valve.
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Water valve is initially only to open slightly, so that the coil will be slowly filled with water. To
avoid heat stress.
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When the heat exchanger is filled, close the vent valve.
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Water valve is to open fully, start the fan.
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Subsequently, the entire piping system must be vented properly.
Attention!
For a temporary shutdown of the system, because of frost and corrosion, it is important to avoid that
condensate is remaining in the pipes.
8.1.3 Electric heater
Observe specifications of chapter 7.4 (Electric heaters) -safety thermostats.
8.1.4 Air filters
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Before the commissioning, all filters should be checked for tightness, as otherwise they could be
sucked in and could lead to damage.
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The mounted differential pressure switches are pre-set according to the final pressure loss on
the technical data sheet.
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These ensure the output of a warning message when the final pressure loss is reached. The re-
sulting maintenance actions are described in
chapter 9.3 ( Air filters ).
8.2 Test run
After having done the preparatory work the AHU can be started for the test run.
- For testing the device and measuring the motor data and the volumetric flow rate, the device
must be fully connected to the operational duct system.
- The AHU doors must be closed, because by eliminating the system-side pressure drop meas-
urement errors will be the result.
Before starting the fan open the dampers! Fan may not run against closed damp-
ers.
In addition, the actual power consumption of all phases shall be measured and compared with the
nameplate. If the actual power consumption is too high, there is maybe a faulty connection. The
system must be shut down immediately.
Measure the volume flow and the pressure difference. Often the measured airflow does not match
with the design data of the device.
Possible causes for low airflow:
- The external pressure drop is higher than indicated on the technical data sheet.
- e.g. closed fire or VAV dampers in the duct