universalblue UBT2500-20 Instruction Manual page 24

distortion
strengthening measures shall be adopted.
•
The pressure relief valve attached with the heater
must be installed at the cold water inlet of this
heater (see Fig.1), and make sure it is not exposed in
the foggy. The water may be outflowed from
pressure relief valve, so the outflow pipe must open
wide in the air; The pressure relief valve need to be
checked and cleaned regularly, so as to make sure it
will not be blocked.
• When using the heater for the first time (or the first
use after maintenance), the heater can not be
switched on until it has been filled fully with water.
When filling the water, at least one of the outlet
valves at the outlet of the heater must be opened to
exhaust the air. This valve can be closed after the
heater has been filled fully with water.
and cracks. Otherwise, other
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