Carbolite RHF Series 3 litre - 35 litre - Manual (Page 12)

RHF
12
MF07 – 3.10
7.0 C IRCUIT D IAGRAMS
In all RHF models the safety switch in the diagram is a positive-break door switch.
EMC Filters (if fitted): dependent on the model there may be one filter, or more than one fitted in
parallel. The circuit diagram examples do not show multiple filter arrangements.
7.1 Single Phase
7.2 2-phase with neutral
As the following 3-phase diagram, except that one phase is not present.
In some models, before mid-2002, direct safety switches were fitted in the element circuit, rather
than the switch in the coil circuit as shown.
7.3 3-phase with neutral
e
l
e
m
e
n
t
(s)
e
l
e
m
e
n
t
(s)
F3
F1
N
F2
L
PE
e
l
e
m
e
n
t
(s)
Instrument Switch
coil
temperature
controller
thermocouple
overtemp.
controller
thermocouple
safety
switch
SSR
heat
on
F3
SSR
SSR
heat
on
F3
heat
on
F3
Filter (if fitted)
if fitted
contactor
if fitted: 2- or 3- circuit
models
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
thermocouple
overtemp.
controller
thermocouple
safety
switch
SSR
heat
on
F3
SSR
SSR
heat
on
F3
heat
on
F3
Filter (if fitted)
if fitted
contactor
note on (2- and) 3-phase: depending on filter(s) fitted, there may be (2
or) 3 separate neutral wires from the elements to the neutral supply.