22
Alpha CD90S/115S - Commissioning
5.8
FINAL COMMISSIONING
1.
Allow the heating system to heat up, then balance the system to achieve the necessary temperature difference
across the heating flow and return pipes at the boiler and check the system volume and pressure. (Refer to
Technical Data, Section 2.2).
2.
Turn off the boiler.
4.
Thoroughly flush out the water pipework (refer to Section 3.10).
5.
Re-pressurise the system as described in Section 5.1.
5.9
FINAL ASSEMBLY
1.
Raise and secure the control panel, replace the front cover and secure in position with the screws removed and
secure the plastic top cover in position using the screws previously removed.
2.
If the boiler is to be left in service with the User, set any external controls to the User's requirements.
3.
If the boiler is not to be handed over immediately, close the boiler gas service cock and switch off the electrical
supply.
4.
If there is any possibility of the boiler being left during frost conditions, then the boiler and system should be drained. It is recommended
that a label is attached to the boiler drawing attention to the fact that the system has been drained.
5.
Complete the details of the installation in the Benchmark Checklist on page 31.
5.10 USER INFORMATION
The User must be advised (and demonstrate if necessary) of the following important points:-
1.
How to light and turn off the boiler and how to operate any external system controls.
2.
The importance of annual servicing of the boiler to ensure safe and efficient operation.
3.
That any servicing or replacement of parts must only be carried out by Gas Safe registered personnel.
4.
Ensure that the boiler controls are set to the User's requirements.
5.
Tell the User about the sealed system pressure.
6.
Tell the User that if the electrical supply is on and the boiler has not operated for 24 hours for heating or hot water,
the pump will automatically operate for 5 minutes.
7.
Explain to the User that an internal frost thermostat is fitted in the boiler, and that the electrical supply to the boiler
must be left on for the thermostat to operate, i.e. the On/Off switch must be set to ON.
8.
Explain to the User that in certain weather conditions the terminal will emit a plume of steam, i.e. water vapour. This
is safe and quite normal.
9.
Show the User the position of the pressure relief valve and condensate discharge pipes.
10. Hand the User's instructions to the User.
11. Ensure the Benchmark Checklist on page 31 has been completed after the boiler has been installed and
commissioned.
Note:
It may require that the installation is registered by the installer through the Gas Safe Work Notification
Scheme.
12. Leave these Installation and Servicing instructions with the User for use on future calls.
Table 6 -
continued
Description
PWM signal level for pump
PWM signal level for pump
PWM hysteresis
PWM pump high/low level
Low/Off and pump cycle
Min rpm for pressure switch (x100)
Min temp for boiler maintain function
Ramp up for HTG or HTG + DHW function
Pre-ignition time
Lower limit value
10
15
1°C
16
x0 = Off
x1 = On
0x = Normal heating pump cycle
0x = Normal DHW pump cycle
5
0°C
0 (heating only)
Not active
Upper limit value
50
50
10°C
255
70
80°C
1 (HTG + DHW)
Parameter
49
50
51
52
53
54
55
56
57
Factory set
Not active
Not active
Not active
Not active
00
5
0°C
0
New value
