THERM-X MVHRU IOM
Page 65 of 108
Version 2.2, 18/06/2020
8.10.
PIPEWORK CONNECTIONS
To avoid strain on pipe joints from movement or vibrations, pipework should be connected to the unit as soon
as possible.
Inlet and outlet connections shall be connected using suitable flexible hoses of the same size as the installation
pipework.
Installation pipework should be supported independently from the unit.
All pipework and connections must be insulated to prevent thermal losses and condensation dripping from
chilled surfaces.
Insulation must not cover over air vents, drain cocks or ports on commissioning sets. Commissioning sets
must be placed so ports are easily accessible for measuring purposes.
Provision should be made, e.g. binder test points, for measuring pressure at flow and return connections, or
at common test points where a number of identical units are connected to self-balancing pipework. Access
must be provided to all test points and across orifice/venture measuring devices.
Flow measuring devices, e.g. commissioning set with orifice plate and double regulating valve, should be
selected to give a measured pressure of no less than 1 kPa. It may be necessary to use a device less than
line size for a unit. There should be a minimum of ten diameters of straight pipe length upstream and five
diameters downstream of the measuring device.
IMPORTANT:
On units equipped with changeover water heat exchangers a 3-way diverting valve piping
arrangement is recommended.
If a 2-way valve must be used the length of the pipework must be assessed in advance to avoid issues with the
operation of the equipment.
IMPORTANT:
Valves and actuators are not included with the product and must be ordered separately.
