NTI INSTALLATION MANUALS

Part 7 - Connecting Electrical Service

OUT1

OUT2

FLUE RETURN

DHW

TANK OUTDOOR

SYSTEM

3 WAY VALVE

HMI

Ebus

B

C A

C

C A

G

G

G

G

HMI

SENSORS CIRCUIT

3 WAY VALVE CIRCUIT

A

A

COMMUNICATION

uP

Hf B A

C

G

C

G

D

G

Nf G C

A

FAN

FLAME

RELAYS

CIRCUIT

CIRCUIT

CIRCUIT

GAS VALVE CIRCUIT

Hf

Nf

B

Nf

Hf

FAN

IGNITER

GAS VALVE

BOILER PUMP

OVERHEAT INPUT

EXTERNAL PUMPS

FLAME ELECTRODE

AIR PRESSURE SWITCH INPUT

N

Nf

NEUTRAL

D A G C B

SMPS

FILTER

HOT

NEUTRAL

HOT filterd

NEUTRAL filtered +5 Vdc

+24 Vdc +5 Vdc for SAFETY MCU

Step-up 250V paek from +24 Vdc Safety Ground

HOT

H

N

Hf

Nf

A

B

C

D

G

F5AT

H

Hf

Figure 71 - Ladder Diagram

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