■
A non-return valve must be installed in the condensate return line to prevent condensate from returning
to the heater and to protect against any hammering in the condensate system. T his applies if the
condensate return line has condensate from more than one steam trap as there could be dif fering
pressures and temperatures and/or to protect against return flow when condensate is "lifted" to the
condensate tank.
■
Both the inlet and outlet lines must have expansion bends to compensate for t hermal expansion. All
pipework must be independently supported close to the dehumidifier to prevent strain on the steam
heater.
■
If the air temperature drops below +7 °C and there is a risk of freezing, a thermostat must be installed
directly after the heater in the airflow direction. The thermostat must be a two-stage type with a long,
temperature s ensing capillary tube. The capillary tube is a ctive a long it s e ntire length, and must be
installed so it covers the sectional a rea efficiently. The thermostat reacts to the lowest temperature
present along t he c apillary tube length, that is where the gas in the thermostat system condensates.
At the air temperature +7 °C, the reactivation effect should increase and a warning-type of alarm
be triggered. If t he temperature drops further to + 3 °C, the thermostat should switch off the
dehumidification sy stem so that the reactivation airflow ceases and an alar m is trigg ered.
In addition to the above, installation of the following components is recommended to facilitate operation
and maintenance:
■
De-aerator to ventil
ate any oxygen or other gases in the steam supply.
■
Shut-off valves.
■
A manometer to ind
icate the steam pressure at the heater.
■
A thermometer, ca
pable of withstanding the line pressure, to indicate the full scale of the steam supply.
■
Filters t o restr
ict unwanted impurities.
■
An extra shut-of
f valve downstream of the condensate t rap. T his to facilitate installation of a
manometer, whi
ch would quickly indicate any counter pressure in the condensate system in the event
of any malfunct
ions during operation.
NOTE!
Ifa mano
meter isinstalledinthe steamline, thefullscalereading must be1,5 times thelinepressure
whereit isins
talled.
190TEN–108 9–G1412
Installation
21
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