NTI INSTALLATION MANUALS

Part 7 - Connecting Electrical Service

Connector

Description

HT Selv

No. of Location

Pin

1

120 VAC LIVE INPUT

CN1

POWER SUPPLY

2

120 VAC NEUTRAL INPUT

HT (120V~) AC

3

PROTECTIVE EARTH

1

120 VAC EXT. PUMP2 INPUT / 120VAC LINE DIV1

EXTERNAL PUMP 2 / Hi-V DIVERTER VALVE (DHW)

2

120 VAC NEUTRAL

3

120 VAC EXT. PUMP2 (NO) / 120VAC LINE DIV2

CN2

4

120 VAC LIVE (NO)

HT (120V~) AC

BOILER PUMP

5

120 VAC NEUTRAL

6

120 VAC EXT. PUMP1 INPUT

EXTERNAL PUMP 1 (CH)

7

120 VAC EXT. PUMP1 (NO)

1

120 VAC LIVE

FAN ON/OFF

2

120 VAC NEUTRAL

3

120 VAC LIVE (NO)

CN3

IGNITER

HT (120~) AC

4

120 VAC NEUTRAL

5

120 VRAC + (NO)

GAS VALVE

6

120 VRAC - (NO)

1

120 VAC LINE

CN8

POWER SUPPLY OUT

HT (120V~) AC

2

120 VAC NEUTRAL

CN4

PROTECTIVE EARTH

1

CN7

PROTECTIVE EARTH

1

CN9

PROTECTIVE EARTH

1

1

+5V

NTC HEAT RETURN

2

CH RETURN NTC SENSOR SIGNAL

3

+5V

NTC HEAT FLOW 1

4

CH FLOW 1 NTC SENSOR SIGNAL

SELV (5V)

5

NOT USED

6

CN26

7

+5V

NTC FLUE

8

FLUE NTC SENSOR SIGNAL

9

+24V

AIR PRESSURE SWITCH

SELV (24V)

10

APS DETECTION SIGNAL

11

NOT USED

12

1

GROUND

DHW FLOW SWITCH

2

DHW FLOW DETECTION SIGNAL

3

+5V

WATER PRESSURE SWITCH

4

GROUND

5

CH WATER PRESSURE SENSOR SIGNAL

CN20

6

SELV (5V)

NOT USED

7

8

STEPPER DIVERTER VALVE COIL 1 START

9

STEPPER DIVERTER VALVE COIL 1 END

DIVERTER VALVE

10

STEPPER DIVERTER VALVE COIL 2 START

11

STEPPER DIVERTER VALVE COIL 2 END

Table 20 - Boiler Wiring - 1

58