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9.5.3 House pressure regulator
Each gas appliance which is connected to the propane installation must be provided with its own
house pressure regulator. The house pressure regulator is a third party delivery.
The house pressure regulator must have a minimum capacity of 10 kg/h / 37 mbar and a CE certication.
ATAG advices to install the house pressure regulator as close as possible to the boiler. When placing the
regulator inside, a discharge drain of ø6mm must be installed. The discharge drain must be directed outdoor.
In case of a discharge the gasses will go outside.
If tting the regulator outside the regulator should be protected against inuences of the weather. The (de-)
aeration must be positioned downwards (see gure 9.5.3.a).
ATAG advices to install measure points on all gas line parts to have the possibility to check for pressure loss.
Pre-pressure must be adjusted to 37 mbar by means of the house pressure regulator. The maximum
permitted closing pressure may be 5 mbar higher than the maximum pre-pressure.
A too high closing pressure in the low pressure gas line can be caused by a high resistance or jam in this gas
line. When the closing pressure keeps increasing the valve in the regulator is not closing correctly. In this
case the regulator should be replaced.
9.5.4 Dimensioning of the low pressure gas line
The gas line from the house pressure regulator to the boiler must have the dimensions according the table
below.
Pump type Grundfos UPM3 15-75
i24C i28C i36C i40C iC
Economiser 27 Plus iC Economiser 35 Plus iC Economiser 39 Plus
Diameter gas line m m m m m m m
ø15mm 3 - - - - - -
ø22mm 30 18 18 18 18 18 18
ø28mm - 30 30 30 30 30 30
9.5.5 De-aerating the LPG tank
When placing a new or revised LPG tank the tank must always be de-aerated.
ATAG advices to inform the gas supplier that a central heating boiler is connected to the LPG tank. For the
boiler it is absolutely necessary that the tank is free of air. When not the boiler will give ignition problems and
will not function.
ATAG advices to measure the content of O
2
. This value should be lower than 1.3%. Contact the gas
supplier in case of doubt.
example propane installation gure 9.5.3.a
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