HRF
4
MF05
Electrical Connections
Connection by a qualified electrician is recommended.
Model HRF 7/22 is designed for use on a single phase A.C. supply, which may be Live to Neutral
non-reversible, Live to Neutral reversible or Live to Live.
Check the furnace rating label before connection. The supply voltage should agree with the
voltage on the label, and that the supply capacity should be sufficient for the amperage on the
label.
The supply should be fused at the next size equal to or higher than the amperage on the label. A
table of the most common ratings is also given in section 8.1 of this manual. Where a supply cable
is present there are internal supply fuses; customer fusing is preferred but not essential.
Furnace with supply cable: either wire directly to an isolator or fitted with a line plug.
Furnace without supply cable: a permanent connection to a fused and isolated supply should be
made to the internal terminals after temporary removal of the furnace back panel.
Connection by line plug: the plug should be within reach of the operator, and should be quickly
removable.
Connection to isolating switch: this should operate on both conductors (single phase) or on all live
conductors (three phase), and should be within reach of the operator.
The supply MUST incorporate an earth (ground).
Connection Details
supply type
Cable colour
Terminal label
Live-Neutral
Reversible or Live-Live
Brown
L
to live
to either power conductor
Blue
N
to neutral
to the other power conductor
Green/Yellow
PE
to earth (ground)
to earth (ground)
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