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Product description
6 720 648 162 (2011/08)
2.8.7
Conditions for hydraulic system and water quality
Operating conditions
Notes – Requirement in greater detail
Operating pressure
(overpressure)
15 – 58 psi
(1,0 - 4,0 bar)
Maximum 30 psi (2 bar) with the supplied safety valve.
Permissible site test pressure
45 – 75 psi
(3,1 - 5,2 bar)
Safety temperature limitation by
TR temperature control
122 – 194 °F
(50 - 90 °C)
Safety temperature limitation by
manual reset high limit (STB)
212 – 248 °F
(100 - 120 °C)
On some controls adjustable on site from 212 (100 °C) to 248 °F (120 °C).
Water quality
−
The heating system may only be filled and topped up with water of domestic water quality.
We recommend a pH value of 8.2 – 9.5.
Table 12 System configuration and water quality
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