HRF
10
MF05
C
IRCUIT
D
IAGRAMS
7.1
HRF 7/22 - no overtemperature
7.2
HRF 7/22 - with overtemperature
Supply light
Instrument Switch
temperature
controller
thermocouple
SSR
e
l
e
m
e
n
t
(s)
heat
on
F1
F2
N
L
E
BU
R
Supply light
Instrument Switch
E
coil
temperature
controller
thermocouple
overtemp.
controller
thermocouple
L
N
F1
F2
Filter
(if fitted)
contactor
R
BU
Fan
Motor
Capacitor
BR
BU
Fan
Motor
Capacitor
BR
BU
heat
on
e
l
e
m
e
n
t
(s)
SSR
Filter
(if fitted)
7.3 Higher Voltages
F2
transformer
F2
For 254V (or above) an isolating transformer is fitted in the
control circuit after the F2 fuses.
8.0
Supply light &
Instrument Switch
