Overview
A heat interface unit (HIU) is a packaged set of components necessary to connect a consumer’s heating and/or hot water systems to the heat network.
This test standard describes how to determine heat transfer capacity and other performance aspects of an HIU under standard conditions or application-specific conditions in a laboratory. It applies to packaged HIUs (also known as consumer interface units, heat stations or hydraulic boards) that incorporate a heat exchanger.
The purpose of the test standard is to establish a common test methodology for the following:
- Product identification
- Static testing of the space heating circuit capacity
- Dynamic testing of the domestic hot water production capacity
- Fluid side pressure drop on both circuits
- Plate deflection
- Heat loss measurements
Amendments
Please not that some corrections were made to this standard on 18/05/2016. In section 4.3.4 on page 7, item 2 was changed to read “Pressure sensors shall be checked against a reference instrument before commencement of each series of tests and zero checked prior to testing each HIU.” Also in table 3 (Thermal capacity test conditions) on page 8, the primary inlet temperature for test condition 2 was changed from 80.0°C to 65.0°C. If you downloaded the guide before 18/05/2016, please download it again.