Therm-X MVHRU HR95
Technical Manual
Page 57 of 59
Version 2.4, 25/09/2020
9.12.
The unit shall be able to operate in BOOST MODE overriding the unit operating settings via the handheld
controller or an external contact. This mode shall also be available when the unit is on standby.
9.13.
The unit shall be able to operate in a TIME SCHEDULLING mode on an weekly and yearly regime. The user
shall be able to define up to 6 time blocks per day and/or 6 date blocks per year with specific settings for each time
block.
9.14.
The unit shall be able to control the conditioned space temperature based on a set-point temperature strategy
by use of the integral temperature sensors (supply or return air) or the external room temperature sensor. The
output of the heat recovery and integral heaters (if installed) shall be continuously modulated to match the set-
point temperature on the handheld controller.
9.15.
The unit shall automatically control the recuperative exchanger efficiency by regulating the face and bypass
dampers position.
9.16.
When the conditions for free cooling are favourable (e.g. summer night ventilation) the unit shall stop the
rotor in order to utilize the colder outside air and save on space cooling
–
this strategy shall also be available when
the unit is in standby.
9.17.
The unit shall provide a frost protection logic for the plate heat exchanger
–
this shall be achieved by
maintaining the exhaust air temperature above freeze point by either modulating the electric pre-heater if installed
or reducing the PHE supply airflow (by using bypass).
9.18.
When an electric post heating coil is installed the output of the heater shall be continuously controlled to
match the pre-set temperature on the controller.
9.19.
The unit shall provide an overheat protection logic for the electric heaters
–
this shall be achieved by the
integral automatic and manual re-sets installed on the control panel. The unit shall provide indication of the
overheating error on the handheld controller.
9.20.
When a LPHW or water changeover post heater is installed the unit shall be able to output a 0-10 V signal
for analogue valve actuation to control the water flow across the coil.
9.21.
When a water changeover coil is installed the unit shall be able to automatically detect the heating or cooling
requirement by measuring the temperature of the inlet water into the coil.
9.22.
The unit shall be able to maintain the supply air temperature between the minimum and maximum defined
on the handheld controller to prevent supply of overheated or overcooled air to the conditioned space.
9.23.
The unit shall include a water coil frost protection logic
–
this shall be achieved by maintaining the air inlet
temperature to the coil above freezing point by modulating the electric pre heating coil if installed or by stopping
the unit operation in the event of freeze risk.