37
16. Once the domestic hot water has been satisfied heat the installation to about
80°C. Turn off the boiler using the controls (not the power supply),
17. Once the pump has stopped vent the boiler / system again if necessary,
18. The boiler is now ready for normal operation,
19. Set the time clock, room thermostat, modulating control and the boiler controls to
the values of your choice.
20. The system and combi boiler will operate in the heating mode only, unless there is
a hot water demand (combi). Check hot water operation by turning on a hot tap,
the boiler should fire and produce hot water or (system) create a demand on the
cylinder (open a tap or raise the DHW set point).
21. Check combustion for correct operation - adjust if found necessary.
22. Re-fit front panel.
23. Complete boiler log book.
Notes:
- The Rehema Selecta is supplied with a number of factory settings. If other settings
are required,
see Par 9.2.3.
- If
CO
2
and CO adjustments are required,
see Par.
11.2.1
and
Par
.
11.2.2.
8.2 Gas rate measuring
Both the system and combi boilers have pre-mixed combustion and therefore the com-
bustion levels must be firstly set according to the
Table 12 in Par. 11.2.1
and only
when these levels are within tolerances should the gas rates be checked.
Please be aware that when you use the forced high service mode that the boiler is
designed to give the maximum heat input of 24 kW (NCV) and when you used the
forced low mode service mode it will give 5.2 kW (NCV) on both the system and
combi boilers.
Procedure:
1. Ensure all other gas appliances are turned off;
2. Operate the Selecta boiler in the ‘
Forced High
’ service mode for at least 2
minutes prior to taking a meter reading;
3. Record the meter reading;
4. After 2 minutes of uninterrupted boiler operation on high fire take another
meter reading and record;
5. Now operate the Selecta boiler in the ‘
Forced Low’
service mode and wait
for at least 2 minutes prior to taking a meter reading;
6. Record the meter reading;
7. After 2 minutes of uninterrupted boiler operation on low fire take another
meter reading and record;
8. Press the rest button on the boiler to remove the boiler from the ‘
service
’ mode;
9. Calculate the gas consumption and refer to the figures in the technical details
(
see Par. 3.1
).
