49
STRATA1
3 8 & 3 8 / 4 6 C O M B I
a) Ensure system has been thoroughly cleansed and flushed, any strainers have been cleaned and that the
appropriate water treatment has been added to the system to prevent corrosion, scale formation etc.
Failure to comply with this will void all warrantee applied to the boiler.
b) Ensure the system and boiler has been properly fully flooded and vented of air and the cold fill pressure at
the boiler is at a minimum 0.5 bar. Air vent for primary heat exchanger is located to the right hand side of
the top of the boiler chassis.
c) Check that the pump within the boiler is free to rotate by removing the vent screw in the end of pump
motor and checking that the impeller shaft rotates freely when turned with an appropriate sized
screwdriver. Replace vent screw.
d) Ensure the appliance has been converted to burn the type of gas available on site.
e) Ensure Gas supply has been purged and there is the availability of working inlet pressure of nominal 20mbar
(Nat gas) or 37 mbar (LPG), and that the appliance supplied is suitable for the gas type
being used. If the boiler is required to be converted to an alternative you must contact MHS Boilers for
assistance.
f ) Check that the flue installation has been properly made.
g) Check that a condense waste pipe (in plastic - copper tube is not acceptable) has been connected to the
boiler and that the syphon cleaning point cap is in place.
h) Where the appliance is taking air for combustion from the room in which it is installed - ensure an adequate
provision for ventilation has been made.
i)
Ensure that there is an adequate heat load available.
j)
Ensure that the electrical connections have been made correctly.
k) Combi boiler – ensure domestic hot water pipework is flushed and fully flooded.
l)
Combi boiler – ensure primary side of water to water heat exchanger is fully vented by releasing air from
vent located on the top right hand side of the insulated heat exchanger. It is recommended to vent heat
exchanger several times during initial commissioning.
m) Set the low pressure switch to operate at 0.5 bar.
19.0 commissioning
the Strata 1 boiler
The Strata 1 boiler should be expertly commissioned by a competent engineer who will need, in
addition to standard hand tools, a U tube manometer and a combustion analyser.
Before attempting to set the Strata 1 38 or 38/46 combi boiler to work, the following check list must
be worked through. See 19.1.
The data badge of the appliance must be marked to indicate the conversion has been undertaken. Refer
to the commissioning section for guidance on Combustion Adjustment.
Boiler Type
White Premix Air Box Hole
White Premix Air Box Hole
Strata 1 38 Boiler
Plug with 15mm Plugs
Leave Open
Strata 1 38/46 Combination Boiler
Plug with 15mm Plugs
Plug with 13mm Plug
19.1 Pre-commissioning
checks
19.2 LPG Conversion
Procedure
The Strata 1 38 and 38/46 combination boilers can be converted to operate on LPG. (G31). Only the
parts supplied in conversion kit# 250158 must be used. The 3.5mm injector must be installed into the inlet
of the gas valve and the 5.7mm injector in to the outlet of the gas valve. Using the plastic plugs supplied the
aeration holes in the white premix air box mounted on the inlet of the combustion fans must be plugged
according to the table below.