Swegon WISE - Additional Moisture Regulation

Swegon reserves the right to alter specications. 20220323
26
WISE User Manual
Additional moisture regulation
Why regulate based on additional
moisture?
The amount of moisture produced in a room varies depending
on the activity and the number of people in the room. Areas
with sporadically high production of moisture can, for example,
be a bathroom when the shower is on. This type of additional
moisture is normally vented out.
How is additional moisture regulated?
Additional moisture is calculated for each room. By measuring
and comparing the vapour content in the indoor air with the
prevailing vapour content in supply air, we get the additional
moisture (g/m
3
). In order to accomplish this requires sensors
to be installed to measure both the temperature and relative
humidity (RH) in the room, as well as the temperature and rela-
tive humidity of the supply air in the air handling unit.
Values are dened in the system for the upper and lower additional
moisture limits, which form the basis of regulation in the system.
Operating case
When the measured additional moisture comes in between the
lower and the upper limit values, i.e. within the regulation range,
the function’s regulation is enabled to increase the air ow
requirement from 0-100%.
The air ow is controlled linearly between the end positions.
• 0% gives the room’s minimum ow (dierent depending on
the room mode).
• 50% gives the room ow in between min. and max.
• 100% gives the room’s max. ow.
In the event of rapid changes in weather, the supply air can
temporarily contain more moisture than the indoor air. In these
instances, the additional moisture value (FT) will be negative in
the system. Usually, however, the relation is the opposite, which
gives a positive value.
A comfort alarm is enabled if the additional moisture exceeds
the alarm limit longer than an adjustable time.
Adjustable room parameters in SuperWISE
Section Description
Standard
value
Min. Max. Unit
Lowest user level
(read/write)
Function
Additional
moisture
Operating
mode
- - - - Local/Installation
O, no additional moisture is calculated, group values are ignored and the room does not
contribute to the group value.
On, additional moisture is calculated and is utilized for regulation and alarms, if the room
is a part of a group, the group value and room contribute towards the group value. Only
measurement, additional moisture is calculated and contributes to the group value.
Additional
moisture
Upper limit -3 0 20 g/m
3
Local/Installation Upper limit for regulation.
Additional
moisture
Lower limit -1 0 20 g/m
3
Local/Installation Lower limit for regulation.
Additional
moisture
Alarm limit 8 0 20 g/m
3
Local/Installation Limit for alarms.
Additional
moisture
Alarm delay 120 1 - min. Local/Installation
Time limit for alarms, the value must be above the dened alarm limit for this time
before the alarm is activated.