Carbolite GVC Series - Manual (Page 15)

G range
MF48 -1.18
15
7.0 C IRCUIT D IAGRAMS
For standard furnaces -/600 upwards, and -/450 if ordered 3-phase, see 7.7; for 3-zone see also 7.6.
7.1 Single Phase (models -/300 & -/450)
7.2 2-phase with neutral (model -/300)
As 7.3, with phase L3 not present, and with two SSRs and element circuits. In models up to 25A
safety switches type A are fitted in the L1 and L2 circuits instead of type B in the contactor coil
circuit.
7.3 3-phase with neutral
In most instances this diagram does not apply. See “universal” wiring, section 7.7. It may,
however, apply if non-standard models are ordered, or for high voltages with the addition of a
control transformer as shown in 7.5.
7.4
Instrument Switch
coil
temperature
controller
thermocouple
overtemp.
controller
thermocouple
SSR
e
l
e
m
e
n
t
heat
on
heater
switch
F3
F1
F2
F3
N
L
PE
Filter
(if fitted)
contactor
if fitted
if fitted
e
l
e
m
e
n
t
e
l
e
m
e
n
t
e
l
e
m
e
n
t
(s)
e
l
e
m
e
n
t
(s)
F1
N
L2
L3
F2
L1
PE
e
l
e
m
e
n
t
(s)
Instrument Switch
coil
temperature
controller
overtemp.
controller
heater
switch
SSR
heat
on
F3
SSR
SSR
heat
on
F3
heat
on
F3
Filter (if fitted)
if fitted
thermocouple
thermocouple
contactor