Lochinvar 000 - 2, 065 MODELS 495,000 - 745,000, Schematic Diagram, Btu/Hr, Optional I/O Reset

47

Ground Line

120VAC/60HZ

Neutral

DISCONNECT POWER BEFORE SERVICING THE UNIT

G

BK

W

W

2

BK/W

BK

FLAME

SHUTOFF/

W

ACC.

CHASSIS

1

W

FIELD PROVIDED

INTERMITTENT

NO

LoGas

HiGas

LOUVER

BK

SOLENOID

BR

PLUG

CURRENT

GROUND

3

REMOTE OPERATOR

COM

W

W

W

COM NO

FLOW SWITCH

C

C

NC

C

OPEN

TEST PINS

POWER SWITCH

FIELD

BR

NO

NORMALLY OPEN BR

BK

OPTIONS

-

F1

BL

BURNER GROUND

+

VENT VALVE

CONTINUOUS

OPTIONAL

120

HI-LIMIT

24VAC

FLOW

R1

W1

AUX. LIMIT

C

X

B

G

GY

5

S1

F2

BR

VAC

SWITCH

W

BL

O

R

LOW AIR

GY

4

LINE

FLASH

24

24VCOM

Y

O/W O/W

LOW AIR

IND.

GY/W

1

S2/FS

NOT

CODE LED

BL

O

COM

NC

COM

NC

PU

TRIAL

2 NEU

USED

BLOWER

W

O

IGNITER

Y

R

GY

Y

GND

Y

R/O

O

Y

O

10

TH

Y

BL

FLAME FAILURE RESET

9

24COM

G

G

PUMP RELAY

O.A.

T

BL

BL/W

8

DC 24V COIL

7

RESET

LOW FIRE VALVE

O

CN7

SENSOR

BL

6

24VAC

PUMP

2

CN3

5

MV

R

R

Y

PU

O

CN8

BK

T

PV

OPTIONAL

CN1

INLET

4

PS

PV/MV

ON BOILER

NO

1

FLAME FAILURE

IGNITION

R

SENSOR

PROBE

INLET

MODULE

MV

4

ON

ENABLE

CN2

CN4

BK

O

PU/W

1

FF

W

C

SHUTDOWN

DISABLE

SENSOR

HEATING

3

BK

O.A.SHUTDOWN

R

R

Y

Y

2

R/O

CN5

FIELD PROVIDED

FULL-FIRE STANDARD

HIGH FIRE VALVE

BL

1

O.A. MAX.

RATIO

PR

REMOTE OPERATOR

JUNCTION POINT

BK = BLACK Y=YELLOW

CN1

OPTIONAL I/O RESET

SYS/

R

PV

Y

TANK PR

ITEM

INDICATES

W = WHITE

T=TAN

SYSTEM/TANK

(ELECTRICALLY SAME)

PR=PURPLE BR=BROWN

CN6

PV/MV

SENSOR

R2 W2

R/O

CLOSED END SPLICE

BL=BLUE

G=GREEN

OFF

HIGH-FIRE

CN9

DOTTED LINE

P=PINK

GY=GRAY

DIFFERENTIAL

R/O

R/O

HI-LOW FIRE

MV

SETPOINT

OFFSET

EQUIPMENT

O=ORANGE R=RED

OPERATOR

INDICATES OPTIONAL

OPTIONAL

RESET

P

J1

TEST SWITCH PROBE

OPERATOR CN1 (4)

24V COM

OPTIONAL ALARM ON ANY FAILURE

OPTIONALLOUVER- CONTACTSVENTER

120V NEUTRAL

120VAC

LWCO IND.

J2

NO

O.C.

O

LWCO OR LWCO

PR

PR

1

T

T

IGNITION

L

POWER

PR

2

O

Y

BR

W

WITH ALARM

G

3

GND RE S E T

G

W

OPTIONAL

MODULE

C

NO

BL

F

M

J4

BL

T

SILENCE

24VAC ALARM

"F2"

BK

BK

BK

W

O

O

4

5

6

J3

24V COM

C

NO

BR

BR

BELL

"B"

BK

"R1"

P

3

2

1

Y

24V COM

IGN MODULE PIN 5 (MV)

BR

R

OPEN

ALARM

R

"X"

C

BR

R

R

Y

LWCO

C

BR

R

CONTACTS

CLOSED

"C"

PR

BR

R

ALARM

NO

"FIELD PROVIDED LOUVER PROVING SWITCH"TO LOUVER OR

C

CONTACTS

Y

TD

O/W

OPTION BOX "A", "B" OR "C"

DAMPER

OPTION BOX "B" OR "C"

BR/W

R

Y

24V COM

C

NC

OPTION BOX "C" ONLY

SCHEMATIC/LADDER DIAGRAM LBL20034 REV A

MODELS 495,000 - 745,000	SCHEMATIC DIAGRAM
BTU/HR