MCDonald ELECTRAflow Installation & Technical Manual page 18

Issue 6
Controller Circuit Board
RTD
(PT1000 Sensor)
Controller
Supply
Room Stat
CH Pump
Controller Repair and Service
The Controller is NOT user serviceable.
Do not dismantle the Controller.
In the unlikely event of a fault developing please contact your installer or qualified
electrician.
The control unit is protected by an internal 100mA fuse. Under abnormal load
conditions the fuse will blow and need replacing (230VAC T100mA).
The immersion heaters are protected by individual internal 15A HRC fuses.
In the event that a fuse should blow, the reason should be investigated as an
underlying problem may be overlooked. If the immersion heaters / pump are found to
be in good working order and the wiring shows no sign of damage the fuse should be
replaced with a new, identically rated, device. (230VAC F15A HRC)
17
07/04/2022
Boost Heater
(HW Immersion)
STR2 Heater
(Str Immersion 2)
STR1 Heater
(Str Immersion 1)
Heater Supply