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The requirements stated in this Evaluation Guideline are used by Kiwa for processing an application and maintaining product certificates for manifolds for warm water and chilled water.
For the performance of certification activities, the certification bodies are bound to the requirements established in the chapter “Requirements for certification bodies”.
The manifold can be connected to a heat and/or cold source.
Remark: In this Evaluation Guideline, every stated pressure always refers to overpressure (e.g. “6 bar” means “6 bar overpressure”).
Heating
The manifolds are intended for use in underfloor heating systems for warm water distribution at a design pressure (= maximum operating pressure) of 3, 6 or 10 bar under the conditions stated in table 1.
| Table 1: Temperature profile for 50 years |
| Class 4 | Class 5 | ||||
Temperature [°C] | Lifetime [Years] | Temperature [°C] | Lifetime [Years] | Safety factor / temperature (plastic manifold housing) | |
| Tcold | 20 | 2.5 years | 20 | 14 years | 1.25 |
| Toperating | 40 + 60 | 20 years + 25 years | 60 + 80 | 25 years + 10 years | 1.5 |
| Tmax | 70 | 2.5 years | 90 | 1 years | 1.3 |
| Tmalfunction | 100 | 100 hours | 100 | 100 hours | 1.0 |
| Remark: the temperature profile indicated is derived from class 4 and class 5 according to NEN-ISO 10508 for 50 years. |
Cooling
The manifolds are intended for use in cooling systems with water or water/antifreeze mixtures at a design pressure of 3, 6 or 10 bar. The water/antifreeze ratio depends on the minimum design temperature.