NTI FTVN - Internal Wiring Details

51
Part 7 - Connecting Electrical Service
Figure 53 - Ladder Diagram
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NEUTRAL
B
HOT
GAS VALVE
CIRCUIT
FLUE
F5AT
H
HOT
N G
Step-up 250V paek from +24 Vdc
FILTER
D
N
+24 Vdc
C
+5 Vdc for SAFETY MCU
H
B
RETURN
+5 Vdc
A
NEUTRAL filtered
FAN
CIRCUIT
SMPS
Nf
HOT filterd
Hf
Safety Ground NEUTRAL
FLAME
CIRCUIT
Hf Hf
3 WAY VALVE
RELAYS
CIRCUIT
SENSORS
CIRCUIT
HMI
B
Nf
Nf
C
D
Nf
A
G
G
OUT1 TANK
Hf
DHW SYSTEM
Hf
OUT2 OUTDOOR
C
B
Ebus
B
C
G
A
3 WAY VALVE
CIRCUIT
Nf
FLAME ELECTRODE
FAN
A A
BOILER PUMP
IGNITER
EXTERNAL PUMPS
OVERHEAT INPUT
GAS VALVE
uP
G
D
C
G
A
G C
C
A
G
HMI
G
C
A
COMMUNICATION
G