Therm-X MVHRU HR95
Technical Manual
Page 8 of 59
Version 2.4, 25/09/2020
2.10.
CONTROLS
All Therm-X MVHR units are factory fitted with a
Plug&Play fully integral intelligent control
package
.
The factory fitted controls include:
Sealed controls enclosure with unit PCB and all
electrics
Mains switch isolator
Face and bypass damper actuator
4 temperature sensors (fresh air, supply air (x2),
return air)
1 sensor for antifreeze protection (exhaust air)
2 digital pressure sensors for filters
3 digital pressure sensors for airflow
measurement and constant pressure operation
2 water temperature sensors (only versions with
water or direct expansion coils)
1 condensate level sensor (x2 for versions with
cooling coil option)
Automatic and manual thermal reset for electric
heaters (only versions with electric heaters)
All units are also provided with the following loose
items (installation and wiring by others):
1 room temperature sensor
1 handheld touchscreen controller (wiring on
site by others, cable not supplied, CAT5 UTP
cable recommended as minimum)
The in-built controls are pre-configured and offer
several alternatives to operate your Therm-X unit.
The controls are ready to go from the moment
the unit is turned ON
, and can be easily configured
with the help of the handheld controller provided
(excludes externally mounted sensors which are
supplied loose and require installation and wiring by
others on site).
Some of the features offered by the controller are
listed below:
2.10.1.
AIRFLOW CONTROL
The controls offer continuous modulation of the
airflow range of the unit in 10% steps.
The ratio of airflows for supply and exhaust can be
adjusted according to the requirements of the project
(+-50%).
The unit can be set to operate in distinct ventilation
modes to control the supply of outside air for
ventilation purposes.
CAV (Constant Air Volume) mode
The unit is programmed to supply a constant amount
of air to the ventilated space.
The unit will adjust the output of the fans according
to the internal or external pressure changes in order
to maintain the amount of air being supplied to the
rooms constant.
VAV (Variable Air Volume) mode
The unit is programmed to adjust the fans output to
maintain a constant pressure in the supply duct while
varying the air volume according to the demand of
the ventilated space.
The unit adjusts the supply flow rate according to the
overall opening of the supply VAV terminal units in
the ductwork system.