Mffi Commissioning, Water Circuit Diagram

2.12Water Circuit Diagram

A/23 MFFI

3 COMMISSIONING

3.1Initial Preparation

- A/27 MFFI	Legend
	1.	Air Pressure Switch
	2.	Fan
	3.	Main Heat Exchanger
	4.	Main Burner
	5.	Ignition Electrodes
		Detection Electrode
	6.	Gas Valve
	7.	Overheat Thermostat
	8.	Main Circuit Temperature Probe
	9.	Diverter Valve
	10.	Main Circuit Flow Switch including
		Safety Pressure Switch for
		Primary Circuit
	11.	Automatic By-pass
	12.	Microswitch for Diverter Valve
	13.	Secondary Heat Exchanger
	14.	Domestic Water Inlet Filter
	15.	Boiler Drain Valve
	16.	Safety Valve
	17.	Water Pressure Gauge
	18.	Circulation Pump with Automatic
		Air Release Valve
	19.	Expansion Vessel

Preliminary electrical system checks to ensure electrical safety must be carried out by a competent person i.e. polarity, earth continuity, resistance to earth and short circuit.

Filling the Heating System:

Remove the panels of the case and lower the control panel (see point 3.2. for further information).

Open the central heating flow and return cocks supplied with the connection kit.

Unscrew the cap on the automatic air release valve one full turn and leave open permanently.

Close all air release valves on the central heating system.

Gradually open valve(s) at the filling point (filling-loop) connection to the central heating system until water is heard to flow, do not open fully.

Open each air release tap starting with the lower point and close it only when clear water, free of air, is visible.

Purge the air from the pump by unscrewing anticlockwise the pump plug and also manually rotate the pump shaft in the direction indicated by the pump label to ensure the pump is free.

Close the pump plug.

Continue filling the system until at least 1 bar registers on the pressure gauge.

Inspect the system for water soundness and remedy any leaks discovered.

Filling of the D.H.W. System: Close all hot water draw-off taps.

Open the cold water inlet cock supplied with the connection kit.

Open slowly each draw-off tap and close it only when clear water, free of bubbles, is visible

Gas Supply:

Inspect the entire installation including the gas meter, test for soundness and purge, all as described in BS 6891:1988.

Open the gas cock (supplied with the connection kit) to the appliance and check the gas connector on the appliance for leaks.

When the installation and filling are completed turn on the central heating

Ariston A/27 MFFI Mffi Commissioning, Water Circuit Diagram, Initial Preparation, Gas Supply