16
400
The boiler was designed to make regulation easy. To
access the adjustment and control area, simply remove the
cover by unscrewing the screws “A” and “C” and lift up the
small service panels “B1” and “B2” respectively.
The first provides access to the control (low voltage)
P.C.B., while the second makes it possible to work on the
power supply P.C.B.The service panel “B2” also provides
access to:
- the power supply cord connector;
- the fuses;
- the selector knob for continuous operation of the circulation
pump.
The service panel “B1” also provides access to:
- the potentiometer for regulating the ignition delay (anti-
cycling) feature, which can be set from 0 to 2 minutes (factory
set at 1 minute);
- the potentiometer for regulating the soft-light feature, the set-
3.4
Initial Start-up
The checks to be run before initial start-up are as follows:
1. Make sure that:
- the screw on the automatic air valve has been loosened when the system is full;
- If the water pressure in the system is below 1.5 bar, bring it up to the appropriate
level;
- Check to see whether the gas cock is closed;
- Make sure that the electrical connection has been made properly and that the
earth wire is connected to an efficient earthing system;
- Supply power to the boiler by pressing the On/Off switch <L> - the L.E.D. “I” will
turn on - turn the selector knob “C” to the <winter> setting. This will start the cir-
culation pump. After 7 seconds, the boiler will signal a shut- down due to failure
ignition. Leave the boiler as it is until all of the air has been bled from the lines.
- Loosen the cap on the head of the pump to eliminate any air pockets;
- Repeat the procedure for bleeding the radiators of air;
- Open the taps for a brief period;
- Check the system pressure and, if it has dropped, open the filling loop again to
bring the pressure back up to 1.5 bar.
2. Check the exhaust flue for the fumes produced by combustion.
3. Make sure that all gate valves are open;
4. Turn on the gas cock and check the seals on the connections, including the one
for the burner, making sure that the meter does not signal the passage of gas. Check
the connections with a soap solution and eliminate any leaks.
5. Press the reset button “A” for the lighting system; the spark will light the main
burner. If the burner does not light the first time, repeat the procedure.
6. Check the minimum and maximum pressure values for the gas going to the burn-
er; adjust it if needed using the values indicated in the table in section 4. (See sect of
the servicing manual).
3.5 Operational
Adjustments
3.3
Control Panel
Legend:
A Ignition Faliure Reset/Safety Thermostat
Reset
B L.E.D. for Ignition Faliure
C Selector Knob for Summer/Winter/
Flue Test Modes
D L.E.D. for Insufficient System Pressure
E Domestic Hot Water Temperature Control
F Central Heating Temperature
Indicating Leds
G L.E.D. for Safety Thermostat (overheating)
H Heating Temperature Adjustment Knob
I
L.E.D. for ON/OFF Switch
L ON/OFF Switch
O Heating System Pressure Gauge
* Warning the flue analysis mode must only be selected by a qualified service engineer.
FR004A
FO005A
Summary of Contents for Genus 27 Plus
Page 46: ...403 Users Manual...
