Download FRS100 Multiburner Control User`s Manual

Chapter 2. MOUNTING AND WIRING
■ Wiring the solenoid valve
CAUTION
Do not connect the solenoid valve to the voltage side.
If a ground fault occurs, ground current will flow to the solenoid valve and
open it, causing fuel to flow regardless of the state of this control.
● Correct connection
100V
Ground side (G)
N
(Ground fault)
L
Burner
Power
Flame relay
FRS100
Valve (closed)
Combustion unit
Voltage side (H)
Fuel
Ground current will not flow to the solenoid valve if the valve is wired as shown
in the figure above, even if faulty insulation on the voltage side (H) causes a
ground fault. Accordingly, the valve will not open, eliminating the risk of fuel
discharge.
● Wrong connection
(Ground fault)
100V
Burner
Power
Flame relay
FRS100
Ground side (G)
N
L
Valve (open)
Combustion unit
Voltage side (H)
Fuel
Ground current will flow to the solenoid valve if the valve is wired as shown in the
figure above and if a ground fault occurs. Accordingly, the solenoid valve will
open regardless of the flame relay, causing fuel discharge.
2-7