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The heat exchangers, fittings and valves shall be tested for tightness.
Attention!
Refrigerant
If direct expansion heat exchangers or air cooled heat exchangers are installed, the system must
be filled with refrigerant after the complete assembly. In this case, a refrigeration engineer must
execute the installation and piping.
Water heat exchangers
Normal heating, cooling coils filled with water and additives for freeze and corrosion protection:
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Open vent valve.
Water valve is initially only to open slightly, so that the coil will be slowly filled with water. To
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avoid heat stress.
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.
Steam heat exchanger filling
Open vent and drain valve on the condensate drain.
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Open the steam valve only slightly at the beginning, until on drain out and vent valve (on the
condensate drain outlet) steam is coming out.
Close drain and vent valve and open steam valve fully.
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Check regularly vent valve during operation.
Attention!
For a temporary shutdown of the system, because of frost and corrosion, is to avoid that conden-
sate is remaining in the pipes.
8.1.4 Electric heater
Observe specifications of chapter 7.5 (Electric heaters) -safety thermostats.
Caution with electric heaters that are located near to a honeycomb humidifier: The
material of the honeycombs is only resistant to a temperature of max. 60°C. Start the
heater only with running fan – heat removal!
8.1.5 Filters
Differential pressure measuring devices - U-tube manometer and inclined manometer- are op-
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tional and must be filled with the supplied test liquid (bottle) of density 1 kg/l.
Is a differential pressure switch is mounted (option) or is it installed on site, it is to set to the
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final pressure drop. Information regarding final pressure drop can be found at the technical da-
ta sheet.
In addition, the output of a warning message when the final pressure loss is reached must be
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ensured during the commissioning. The resulting maintenance actions are described in chap-
ter 9.3 (Air filters).
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