13
Alpha CombiMax 350 and 600
Refer to the instructions supplied with the boiler for full details of the operation of the boiler.
The CombiMax will supply hot water provided the selector switch on the boiler is set to either
or
.
Note: The clock (if fitted) only controls the operating times of the central heating, not domestic hot water - DHW is available
continuously, unless an external DHW clock has been fitted to the CombiMax.
Domestic hot water supply always takes priority over central heating. If a demand for hot water is required during a central heating period,
the boiler will automatically switch to the hot water mode until the demand is satisfied, i.e. storage water is to the required temperature. This
interruption in the central heating is only when the demand for hot water is present and should not be noticed by the User.
When there is a demand for hot water (by opening a hot tap or temperature of the stored hot water is below the thermostat
setting) the store pump starts and circulates mains water through the boiler operating the boiler DHW flow switch. The burner
lights and the mains water is heated by the DHW heat exchanger. When the water in the store reaches a temperature of
approximately 56°C the store thermostat switches the store pump off.
When a hot tap is opened, hot water is supplied from both the store and boiler. When the temperature within the store falls
below the outlet thermostat setting, the hot water flow from the store is stopped and hot water is supplied (at a reduced rate)
from the boiler only.
5.5
FINAL COMMISSIONING
Thoroughly flush out the water pipework and water in the CombiMax store. Clean the filters within the pressure reducing valve
and the mains water inlet valve.
5.6
FINAL ASSEMBLY
After completing the assembly of the boiler, place the CombiMax front casing in position and secure it at the bottom with two
screws.
Note: Ensure the label has been fitted over the domestic hot water thermostat knob, and that it is set at maximum.
5.7
USER INFORMATION
The User must be advised (and demonstrated if necessary) of the following important points regarding the CombiMax:-
1.
Explain the operation of the CombiMax.
2.
The domestic hot water thermostat control knob on the boiler must be set and left at maximum.
3.
If an immersion heater has been fitted, it must only be switched on if the boiler/CombiMax is not working.
4.
Show the User the position of the pressure relief valve discharge pipes and tundish for the heating and DHW systems.
5.
Hand the User's instructions to the User.
6.
Leave these Installation and Servicing instructions with the User for use on future calls.
6
OPERATION
Note: It is the law that any service work must be carried out by a competent person.
The boiler must be serviced as described in the instructions supplied with the boiler, taking note of the following instructions
regarding the servicing of the CombiMax.
Warning: Before servicing the CombiMax or boiler ensure the electrical and gas supplies have been isolated.
Gain access: Remove the bottom two screws securing the CombiMax front casing and lift the casing up slightly and remove.
1.
Inspect and clean, if required, the filter and cartridge in the pressure reducing valve and cartridge in the expansion relief
valve fitted to the store.
2.
Check the charge in the domestic hot water expansion vessel and re-pressurise if necessary.
Check the charge only when the pressure in the mains supply is zero.
7
ROUTINE SERVICING