Therm-X MVHRU HR95
Technical Manual
Page 9 of 59
Version 2.4, 25/09/2020
DCV (Demand Controlled Ventilation) mode
The unit is programmed to adjust the supply airflow
according to the occupancy on the ventilated space
matching the outdoor air supply to the ventilation
demand.
The fan output is determined by a 0-10V input from
an air quality sensor (CO2, RH, VOC, etc.., can be
ordered from Barkell, installation and wiring on site
by others).
The flow rate is controlled according to the 0-10V
signal.
“Breathing”
The unit can be set to turn OFF when the IAQ
requirements on the ventilated space are satisfied in
order to save energy.
The unit then turns ON regularly to “breathe” and
check the concentration of pollutants, returning to
normal operation if required.
Trickle mode
If a PIR motion sensor is installed in the ventilated
space (can be ordered from Barkell, installation and
wiring by others), in the event of no occupancy the
unit provides only minimum background ventilation
to save energy.
Boost mode
When there is a high demand for ventilation or swift
heating or cooling of the space is necessary (e.g. unit
start up) the boost mode overrides the operation of
the unit and runs the fans at the maximum defined
airflow for the time period determined by the user.
The boost mode can be enabled with the supplied
handheld controller or an external switch (by others).
Time scheduling
The unit can be set to operate on a timed operation
on weekly and/or yearly schedules with individual
settings for up to six time blocks per day/year.
2.10.2.
TEMPERATURE CONTROL
The unit is able to control the conditioned space
temperature based on the temperature of the supply
or return air.
Temperature control based on room temperature is
also possible given the room temperature sensor
(supplied with every unit) is installed (on site by
others).
The unit automatically and continuously controls the
output of the heat recovery device and the optional
integral and external heat exchangers (if installed) in
order to achieve the set-point temperature defined by
the user.
The supply air temperature is kept in between the
limits defined during commissioning to avoid very
cold or very hot air being supplied to the room.
Automatic free cooling
The unit automatically detects favourable conditions
for free-cooling and ventilates using the cold outside
air to achieve space cooling savings.