Plumbing; Filling Loop - Dimplex ASCARI MA 12 Installation And Servicing Instructions

2.8 - Plumbing

• The system should be flushed prior to connecting the boiler to remove all particles from the pipework. Do
not use the fitted pressure relief valve to flush the system as particles trapped in the valve will cause
incorrect valve operation.
• At least one air bleeding device should also be connected to the highest point of the plumbing system to
remove trapped air and ensure silent running of the heating system.
• If using radiators with Thermostatic Radiator Valves a bypass radiator must be fitted with lockshield valves
that will allow a flow of 350 litres/hour.
• Service valves should be connected to the inlet and outlet of the boiler for easy maintenance.
• Although the boiler can operate without a room thermostat this is required for automatic adjustment of boiler
output temperature.
• Where underfloor heating is being used, the 60°C thermal cut-out must connected in place of the factory
selected 100°C device (see section 1.3.1).
• A drain cock is required to be fitted in the lowest part of the heating system to allow the system fluid to be
drained fully.
• A filling loop must be installed that isolates from the cold mains water supply from the heating system and
complies with the current building and water regulations in force at the time.
• The boiler incorporates an 8-litre expansion vessel which is suitable for heating systems as follow :
Initial system pressure (bar)
Total water in heating system (litres)
For larger systems Multiply the volume water by these factors
2.9 -

Filling loop

This boiler is not fitted with a filling loop. Any filling loop being fitted should comply with the water supply (water
fittings) regulations 1999 Section G24.1 and G24.2. A filling loop should be fitted at some point to allow the CH
system to be filled.
Two tipes are shown below : METHODS OF FILLING A SEALED SYSTEM
Recommended and approved method for filling closed circuits in a house.
METHOD A
Temporary Flexible Hose
immediately after filling
Stop
valve
Mains Double
water check
supply valve
assembly
(R24-2a Water Regulations Guide)
Connection
To be removed
Stop
valve
Heating
System
Ascari - 12kW -page 10 -
Mains
water
supply
Return
0,50 0,75
96 84
0,0833 0,093
METHOD B
Cistern &
Overflow
Pressure Pump &
reducing valve
(if required)
1,00 1,50
73 50
0,109 0,156
Stop
valve
Heating
System
Return