2 Electrical connections
The Mikrofill Maxi requires a permanent 230V 50Hz 1 phase supply rated at 6 amp. The unit is internally fused at 5 amp
(see electrical installation diagram).
The Maxi also incorporates two BMS relays offering volt free contacts for the remote indication of high or low pressure
conditions within the heating/chiller system. These relays are also independently fused at 5 amp to protect the Mikrofill
Maxi from external electrical faults. A further volt free relay is included in the unit, this is to interlock the boiler or chiller
control circuits. Should either of the alarm relays operate then the relay will shut down the boiler or chiller, indication of
any alarmsituation will be indicated on the display. The relays are suitable for use on control voltages up to 250V.
Once the Mikrofill Maxi has been correctly connected the unit is ready for use. Ensure that the unit has an adequate water
supply and the service valves are open. Check for water leaks. Although every Maxi unit is factory tested it is still advisable
to vent the pump(s) before operation. This is achieved by slackening the brass plug (14mm A/F).situated on the pump
housing, until all air is eliminated. Switch on electrical supply to the unit and the on/off switch to the lower right hand
side of the unit and the unit will start to pressurise the system. When the systemhas achieved the set pressure, the unit
will stop filling, and go to standby.
Important note, " pump type" pressurisation units are not designed to fill systems fromempty, they are only capable of " top
up" and pressurisation. The system should be filled by other means in compliance with the water regulations. The Mikrofill
Maxi is capable and approved to fill heating/chiller systems.
2.1 Electrical diagram
7
Electrical data
Supply: 230V 1ph 6 amp
Full load current: 2.5 amp
Start current: 4.5 amp
Fuse rating: 5 am p / 8 amp
BMS relays and boiler/chiller
relays: volt free contacts rated
at 250VAC at 5 amp
All relays are independently
fused at 5 amp
Low pressure alarm High pressure alarm
Boiler/chiller
common alarm
230 VAC 50Hz
