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5.
Commissioning
5.1. Commissioning the boiler
It is recommended to carry out the following:
- reference should be made to BS 5449 Section 5 when commissioning the boiler;
- open the mains water supply to the boiler;
- open all hot water taps to purge the DHW system;
- ensure that the filling loop is connected and open, then open the heating flow and return valves on the boiler;
- the system must be flushed in accordance with BS 7593 and the flushing agent manufacturers instructions;
- pressurise the system to 1.5 bar then close and disconnect the filling loop;
- turn the gas supply on and purge according to BS 6891 “Domestic Gas Installations”;
- test for gas soundness;
- turning either of the temperature control knobs will set the relevant temperature. When the knob is turned the display will alter and
show the selected temperature. After a few seconds the display reverts to show the current boiler temperature.
At the time of commissioning, complete all relevant sections of the Benchmark Checklist located on the inside back pages of
this document.
5.2.
Setting the timer
The Electro-Mechanical Timer allows the central heating system to be set every 20 minutes. Using the three position switch the timer will
allow either constant operation, timed operation or central heating off. Move the switch button by sliding to the desired position.
There are three position switch:
Constant (Top position):
The heating will be on constantly irrespective of the position of the tappets. The heating will be controlled by
the main thermostat on the appliance and/or any external controls.
Timed (Central position):
The heating will operate according to the position of the tappets and be controlled as above.
Off (Bottom position):
No central heating. Domestic hot water will operate on demand.
To set the time of day
Turn the timer outer bezel clockwise, to align the pointer with the correct time to the nearest 20 minutes. Do not at any time attempt to
turn the bezel anti-clockwise.
To set the timed heating program
Decide which times of the day the central heating is required. The heating will operate when the green tappets are set to the outer edge
of the bezel. To ensure the heating stays OFF set the required tappets inwards towards the centre of the bezel. Each tappet represents
20 minutes.
5.3.
Checking
Before testing the boiler, it is recommended to carry out the following checks:
- compliance of flue gas discharge ducts and terminal installation according to instructions:
when the boiler is operating no
products generated by combustion are to leak from any gasket;
- power mains supply to boiler is 230 V ~ 50 Hz;
- the system is correctly filled (water pressure gauge is to display 1 - 1.3 bar);
- all stopcocks in the system piping are to be open;
- gas type is to be in accordance to boiler specifications: convert the boiler to the available gas type; the procedure is to be performed
by technically qualified personnel;
- gas supply stopcock is to be open;
-
no gas leaks are to be detected;
- electric power switch, external to the boiler is to be on;
- boiler 3 bar safety valve is not to be blocked and correctly terminated;
- the condensate trap must drain correctly and is correctly terminated;
- water leaks are not to be detected;
- pump is not to be stuck;
- a gas rate measurement may now be made. (see tables 3, 4, 5)
Should the boiler not be installed in compliance with current laws and standards, inform the installer and do not test the
boiler.
WARNING
The boiler is equipped with a pump with three speeds, corresponding to the residual head to the system (refer to subsection
3.4.)
The boiler is delivered with the pump set to third speed.
When changing speed to the pump, in accordance with the flow rate required by the boiler (ensured by the primary flow switch)
and the system characteristics, verify that all the conditions relative to the system itself (such as closing of one or more zones in
the CH system or closing of thermostatic valves) are respected.
5.4.
Switching on and switching off
For boiler switching on and switching off procedure follow § 1. Instructions for the User.