Carbolite CR Series - Manual (Page 11)

Clean Room Ovens
MF21 – 3.07
11
7.3 Three Phase without Neutral (delta e.g. 208-240V)
7.4 Three phase without Neutral (star – e.g. 380-415V)
The circuit is similar to 7.4, but the “neutral” ends of the
elements are not connected to a neutral terminal block.
The control circuit contains an isolating transformer to reduce
the control voltage to 240V or similar.
7.5 Higher Voltages (e.g.254V)
The control circuit contains an isolating transformer to reduce
the control voltage to 240V or similar.
Instrument Switch
e
l
e
m
e
n
t
(s)
F1
F2
L1
PE
Filter
contactor
SSR
SSR
SSR
e
l
e
m
e
n
t
(s)
e
l
e
m
e
n
t
(s)
instrument and fan
circuit as above
L2
L3
if overtemperature
control fitted
F2
F2
transformer
Instrument Switch