MHS Boilers Ultramax WM 100, Operating & Maintenance Manual, Page: 15 / 50

MHS Boilers Ltd ©
191007
15
5.3 Connections
5.3.1 Gas connection
The gas connection should be installed by a recognised installer in accordance with applicable
national and local standards and specifications.
The gas connection is located on the bottom of the appliance.
The pressure on the inlet side of the appliance should be reduced to 20 mbar for natural gas and
up to 50 mbar for propane, using a gas governor.
The pressure loss in the supply pipe should be such that the pressure never falls below 18 mbar
for natural gas and 33 mbar for propane, when the appliance is at maximum load.
In order to guarantee that the gas valve works at all times, it is recommended that a gas filter is
installed in the gas pipeline. The gas filter can be ordered as an option to be supplied with the
boiler.
Install a gas isolating valve directly under the appliance.
5.3.2 Electrical connections
The electrical connections should be installed by a recognised installer in accordance with applicable
national and local standards and specifications.
The appliance is fully wired in accordance with the electrical diagrams delivered with the appliance.
All the electrical connections are located behind the control panel. The control panel can be easily
opened after removing the locking screw. The cables to be connected (supply, control) enter
through the bottom of the appliance via cable glands.
Fig. 4 Connections of the WM
The appliance is suitable for a 240 V 50Hz power supply with live/neutral/earth. Other connecting
arrangements are only permissible if an isolating transformer is used. The appliance is phase