3.8 Steamregulation
NOTE!
Steamregulationsettingmustonlybe changedby authorisedpersonnel. Contact Muntersformore
information.
For dehumidifiers with steam reactivation heater, the dehumidification capacity/reactivation heater effect
can be regulated according to the two different principles described below.
1. Steam pressur e regulation: The steam pressure in the steam heater is regulated by a modulating
reducing valve on t he steam inlet. As this regulating principle result in a narr ow regulating range for
the reactivation tem perature, it is not suitable if the dehumidifier w ill run for long periods with low
dehumidification need.
2. Variable reactivation flow: Steam pressure and c ondensation temperature remains constant all the
time. T he steam control valve is operated with an ON/OFF-function. Dehumidification capacity and
reactivation power is controlled by varying reactivation flow, this by means of variable-speed control on
the reactivation fan. T he reactivation fl ow can be down-regulate d from rated flow to a small flow limited
by the fan motor's minimum speed, or the air distribution in the reactivation sector.
When the steam control valve closes, the steam flow to the h eater is shut-off. This can be se lected when
there is no need f or dehumidification, or when the dehumidifier is turned off.
In order t o limit the r eactivation temperature when the reactivation airflow is low, the steam supply
pressure must not exceed 4–5 barg.
The default sett ing from the factory is variable reactivation flow.
3.9 Steamheater–recommendationsforinstallation
NOTE!
Whentheunitis delivered,the flanges areonlytightened byhand. The flangesmustbefullysealed
andtightenedbefore thesteamsupplyisconnected.
See 8.3, Dimensions and service space for dimensions. See 8.4, Technical data for steam data.
The following components must be installed as part of the steam s upply system to e nsure problem-free
operation:
■
A separator for removing contaminants and fluid from incoming steam. The se parator removes fluids
that can negatively affect the heat transmission surface or cause erosion damage.
■
A steam control valve for opening and closing the steam flow through the heater. When regulating
with steam pressure, the valve is used for adjusting the stea m flow. For all types of control valves, it is
important that they open slowly to reduce the risk of hydraulic shock, thermal strains and erosion that
can damage the heat exchanger. It is recommended to use an equal percentage valve to obtain a slow
opening action. The valve actuator must have an opening time of no less than 120 seconds.
■
When the steam control valve has a modulating function, the pressure drop across t he valve affects
the steam pressure to the steam heater, and t herefore the temperature that can be achieved. Obey this
when designing a control valve.
■
A vacuum breaker shall be installed on the steam inlet to make it possible to drain condensate upon
shut-down and when operating with low power consumption.
■
Thesteam trap mustbe afloat type, preferably with built-in thermal de-aerator. A thermostatic trap
must not be used.
20
Installation
190TEN–1089–G1412
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