Circuit Diagrams - Carbolite GHA Installation, Operation & Maintenance Instructions Manual

7.0 C D
IRCUIT 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)
Filter
(if fitted)
F1
N
L
PE
Instrument Switch
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
N
Filter (if fitted)
L3
L2
F1
L1
F2
PE
MF48 -1.18
F2
overtemp.
controller
temperature
controller
Instrument Switch
heater
switch
overtemp.
if fitted
controller
thermocouple
temperature
controller
thermocouple
heater
contactor
switch
if fitted
coil
if fitted
thermocouple
SSR
thermocouple
contactor
coil
SSR
SSR
SSR
F3
e e
l l
heat
e e
on
m m
e e
n n
t t
F3
e e
l l
e e
m m
e e
n n
heat
heat
t t
on
on
(s) (s)
F3
F3
G range
e
l
e
m
e
n
t
e
l
e
m
e
n
heat
t
on
(s)
F3
15