andrews R18 Series, Техническая документация инструкция

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18IP22B
42
Fig. 28 Control panel
7 OPERATION AND FAULT INDICATION
7.1 Function The water heater starts up in the sequence described below:
7.2 Regulation The burner (input) is controlled through a butterfly valve and
7.3 Control panel To assist with fault finding the control panels incorporate a
Heat demand. Air damper test. Ignition of pilot flame. As soon
as pilot flame is detected, an ionisation current will pass to the
flame safeguard control box. The main gas valve opens and
gas ignites over complete burner tray. The modulating control
will commence from low fire condition.
modulates between 20 % and 100 % heat demand. If the heat
demand is smaller than 20 %, the burner will remain off. The
temperature is controlled through an electronic PID regulator.
number of warning indicators and switches.
1 Power on/off switched indicator
2 Water heater lock-out indicator (ionisation)
3 Reset switch
4 Overheat temperature indicator
5 Insufficient water flow indicator
6 Low gas pressure indicator (optional)
7 Gas leak indicator (optional)
8 High gas pressure indicator (optional)
9 By pass switch for high limit test
10 Hours run indicator