Lochinvar 399 LADDER DIAGRAM 990,000 - 2,070,000 BTU/HR MODELS, LBL20012 REV A, VAC 15AMPS, Line

Hydronic Heating Boilers and Domestic Water Heaters

LADDER DIAGRAM 990,000 - 2,070,000 BTU/HR MODELS

LINE

120 VAC 15AMPS

NEUTRAL

GROUND

60Hz

BK

W

ALARM

PR

1

WARNING:

THIS

HEATER

MAY

BE

G

OPTIONAL

INPUT 4

ON/OFF

AUX. HI-LIMIT

HI-LIMIT

POWER

2

CONNECTED

TO

ONE

OR

MORE

BRANCH

+

SWITCH

CIRCUITS.

TO PREVENT ELECTRICAL SHOCK,

CIRCUIT BREAKER

BL

BL

BK

ENSURE

ALL

BRANCH

CIRCUITS

ARE

DE-

BR

CHASSIS

120 VAC

ENERGIZED BEFORE ATTEMPTING TO SERVICE

BL

24 VAC

BK

GROUND

TEST

O.C.

~

T

THIS EQUIPMENT.

SWITCH

J1

24 VAC

J3

~~ PROBE

~

CONTROL

6

3

CHASSIS

-

W

~~

T

T

G

W

~

BL

~~

BL/BK

5

2

Y

~

GROUND

BL/

~~

RESET

4

1

PR

BK

J2

Y

Y

Y

PR

O

P

1

2 3

J4

PR

Y

RESET

OPTIONAL ALARM

PR

SILENCE

BL/BK

BL

BL

BL

BELL 24V OUTPUT

GND

-

Y

ALARM INPUTS

C

O/BK

+

NO

R

Y

HIGH

LOW

Y

ALARM

1, 2, 3 & 4

O

24

12

CONTACTS

JOIN HERE

PR

C

R

PR

PR

ALARM

HD-

Y

NO

INPUT 1

BL

1

PR

PR

TD

Y

Y

OPTIONAL HIGH-LOW GAS

PR

23

PRESSURE SWITCHES

AE

INTERMITTENT

PR

OPTIONAL

ALARM

ALARM ENABLE

CONTACTS

PUMP RELAY

INTERMITTENT

RELAY

ANY FAILURE

PU

Y

INPUT 2

BR

BR

ALARM ENABLE

13

14

RELAY

HD#1

PR

AL

Y

NO

N.O.

C

PUMP

C

TO POWER

BK

O/

PR

STAGE #1

HEAT

FLAME

NO

SOURCE

C

Y

BK

R

CURRENT

P

PR

PR/BK

1C

1NO

2

DEM

-

+

BK

W

TEST PINS

CONTINUOUS INTERMITTENT

#1

GY

5

S1

F1

HD#2

F2

BK

RESET

LINE

BK/W

GY

4

STAGE #3

R/

OVERRIDE

-

W

PUMP OPTIONAL

A1 A2

A3

B1 B2 B3

HEAT

TRIAL

3

STATUS

ON BOILERS

O

+

BK

3C

3NO

3 DEM

2

NEU

W

O

PR/BK

IGNITER

GY

W

P

#2

S2/

OPTIONAL

GY

1

IGNITION

FLOW

FS

RUN

TIME

SWITCH

11

MODULE

O

O

TH

RELAY

O/BK

10

#1

15

16

CONTACTS

~~~

P

9

PI

~~~

TERMINAL

STAGE #1

O

RESET

8

24COM

Y

Y

BL/BK

PURGE

BL/W

P

7

RESET

Y

STAGE #1

STRIP

BL

RT2

RT1

BL

6

24VAC

P

R

R

Y

NO PROVING RELAY

5

MV

FIELD INSTALLED

4

1

T

4

PS

SAFETY DEVICES

C

3

M/S

G

R/O

R

RELAY

CONTINUOUS INTERMITTENT

PRESSURE

2

10

BOARD

STAGE #2

1

FF

A1 A2

A3

B1

B

STAGE #2

SWITCH #1

PR/BK

9

R/BK

Y

2

B3

R/

R/BK

8

Y

BLOWER #1

2C 2NO

BK

17

18

OK

OK

BL

FFR

7

BK

HIGH

~~~~

FAIL

FAIL

STAGE #2

PR/

C

NO

Y

G

LOW

W

BL

6

1

4

7

R

COM

COM

NC

BK

P

CONTINUOUSLY INTERMITTENTLY

C

NO

5

2

5

8

W

MONITORED

MONITORED

ALARM

PR

CHASSIS

BLOWER #2

NOTE: SHOWN WITH SHORTING

STAGE #4

OPTIONAL

4

3

6

9

R

LOW

~~~~

BARS REMOVED AND ATTACHED

R/

GROUND

HIGH

R/W

3

W

DEVICES IN NON-ALARM STATE.

BK

4C

4NO

W

21

22

EXAMPLE DEVICES:

FLAME

R/

STAGE #4

2

HIGH/LOW GAS, AUX. HI-LIMIT

CURRENT

-

+

BK

O

STAGE #4

RATURE R ELROL EMPET ONTC

AUX. LIMITS , EXT. FLOW SWITCH

NICTRO CELE

TEST PINS

GY/

F1

1

R/W

Y

5

S1

BK/

FIELD SUPPLIED LOUVER/

W

F2

GY/W

4

LINE

W

POWER VENTER CONNECTIONS

-

TRIAL

3

W

STATUS

COM

CLOSED

MOTOR

PROVING

O/

NEU

+

BK

OPEN

GY/W

2

W

W

CONTACTS

SWITCH

IGNITER

BK

GY/

1

S2/FS

IGNITION

REMOVE

W

NOTE :

SOME ST AGES HAVE

JUMPER

O/

11

MODULE

BK/W

O/W

TH

MO RE THAN O NE GAS VAL VES .

10

#2

19

20

W

P

9

PI

ALARM

STAGE #3

O/W

RESET

8

24COM

Y

Y

GY

GY

PURGE

BL/W

7

RESET

R/O

PR

INPUT 3

BL

BL

6

24VAC

STAGE #3

R/O

C2

BR/W

NO PROVING RELAY

5

MV

R/O

Y

NO2

PROVING RELAY

6

3 T/W

4

PS

BL/

BR

2

C

3

ITEM

INDICATES

M/S

G

BR/

PR

Y

5

-24VAC

PRESSURE

2

JUNCTION POINT

BK

NO1

1

FF

FIELD

(ELECTRICALLY SAME)

C1

W

T

4

P-SW#1

SWITCH #2

INSTALL AS

CLOSED END SPLICE

NO1

LE

C1

T

1

IGN#1-PS

ENSORSS

8

BR

1

BR

BR

INLET

NECESSARY

DOTTED LINE

INDICATES OPTIONAL

9

W

2

BR

BR

LOUVER /

NO2

B

EQUIPMENT

3

IGN#2-PS

PR

PR

OUTLET

OPTIONAL

7

PR

T=TAN

VENTER

R

3

PR

PR

W = WHITE

ENABLE/

C2

B

6

BR/W

4

BR/W

BR/W

SYSTEM/TANK

BOILER ONLY

BK = BLACK

Y=YELLOW

CONTACT

6

P-SW#2

PR=PURPLE

BR=BROWN

R

4

T

5

BR/W

BR/W

O.A.

BL=BLUE

G=GREEN

RELAY

BK/

BR/W

W

OPTIONAL LOUVER/VENTER

PR /BK

SENSOR

P=PINK

GY=GRAY

W

5

PR/BK

6

PR/BK

PR /BK

O=ORANGE

R=RED

CONTROL RELAYS

Y/G = YELLOW WITH GREEN STRIPE

W

NOTES:

R

= RELAYS LOCATED O N CONTROL

(1) WHERE POSSIBLE, ALL SWITCHES AND CIRCUITRY ARE SHOWN IN THEIR AT REST STATES.

PANEL

(2) ADDITION OF ENERGY MANAGEMENT SYSTEMS OR OPTIONAL LIMIT SWITCHES TO THE TERMINAL

R

= R ELAYS LOCATED IN WIRING BO X

STRIP REQUIRE THE REMOVAL OF SOME OF THE SHORTING BARS FROM THE TERMINAL STRIP.

= LEDS LOCATED O N DISPLAY BOAR D

(3) SCHEMATIC IS WIRING DIAGRAM, REFER TO ACTUAL COMPONENTS FOR EXACT TERMINAL LOCATIONS.

(4) WHEN REPLACING DAMAGED WIRING, USE EQUIVALENT TYPE AND GAUGE.

= OPTIONA L DIN RAIL CONN ECTO RS

LBL20012 REV A

LO CA TED

IN ELECTRICA L WIRING BO X .

68