Therm-X MVHRU HR95
Technical Manual
Page 56 of 59
Version 2.4, 25/09/2020
9.
Controls
9.1.
The units shall be equipped with a factory fitted, fully integral intelligent control package to provide control of
the ventilation output, supply and room temperature and indoor air quality.
9.2.
The factory fitted controls shall include temperature sensors (fresh, supply and return air), antifreeze sensor
(extract air), digital pressure sensors for filters, fans and the supply duct, water/refrigerant temperature sensors
(only versions with water or direct expansion coils) and all the required electrics and electronic parts including the
mains switch isolator. A condensate level sensor shall be fitted in every condensate drain tray.
9.3.
The unit shall be supplied, as standard, with an wired handheld controller with full RGB touchscreen to allow
easy commissioning and operation and a room temperature sensor for installation in the conditioned space. The
unit controls shall allow for up to 2 controllers to be connected simultaneously.
9.4.
The handheld controller shall provide basic functionality for the end user and enhanced functionality for
commissioning and service. The controller shall have a bootloader functionality to provide easy replacement of the
controller firmware and copying settings across similar units.
9.5.
The unit controls shall allow continuous flow rate regulation of the airflow range of the unit from 0 to 100% in
10% steps.
9.6.
The unit shall be able to operate as standard in CAV (Constant Air Volume) mode supplying a constant volume
of air independently of internal or external pressure changes.
9.7.
The unit shall be capable to operate as standard in VAV (Variable Air Volume) mode supplying a variable
airflow volume according to the pressure changes on the supply ductwork.
9.8.
The unit shall be capable to operate in DCV (Demand Controlled Ventilation) mode supplying a variable airflow
volume provided the installation of an external IAQ sensor connected to the unit. The unit shall be able to optionally
turn OFF to save energy when the IAQ requirements are satisfied, turning back ON regularly to check the
concentration of pollutants and resume the DCV operation.
9.9.
The unit shall be capable to adjust the ratio of the supply and extract airflows providing balanced or unbalanced
ventilation to the conditioned space.
9.10.
The unit shall be able to operate in FIRE emergency mode activated via interlock with the BMS fire
emergency system.
9.11.
The unit shall be able to operate in TRICKLE MODE, provided installation of a motion PIR (Passive Infrared
Sensor) connected to the unit. In this mode the unit shall be able to provide background ventilation when no
occupancy is detected on the room.