Lochinvar 3.5, 2.5 service manual 2Wiring Diagram

Page 59

Installation & Operation Manual

12 Diagrams (continued)

Figure 12-2Wiring Diagram

 

MODBUS

 

BOARD

LARGE CONNECTION BOARD

X1-1

X1-2

BOX DEPICTS OPTIONAL ITEMS

BOX DEPICTS

DUAL SENSOR

SINGLE HOUSING

 

 

 

 

 

 

X1-3

 

SHIELD

 

17

CN6-3

GY

X6-3

 

MODBUS

A

 

18

CN6-2

R

X6-1

 

OPTION

B

 

19

CN6-1

PR

X6-2

 

SHIELD

 

20

 

 

X4-1

BK

RATE

+

0-10V

21

 

 

X4-2

T

OUT

-

22

 

 

X4-3

 

 

CN3-4

 

 

BOILER

+

 

23

 

 

 

0-10V

CN3-6

 

 

BL

PUMP OUT

-

24

 

 

 

CN3-7

 

 

R

SYSTEM RETURN

 

25

 

 

 

CN3-14

 

 

BL

SENSOR

 

26

 

 

 

CN3-13

 

 

R

SYSTEM SUPPLY

 

27

 

 

 

CN3-12

 

 

BR

SENSOR

 

28

 

 

 

CN3-11

 

 

W

TANK

 

29

 

 

 

CN3-10

 

 

OR

SENSOR

 

30

 

 

 

CN3-9

 

 

OR/W

OUTDOOR

 

31

 

 

 

CN3-8

 

 

P

SENSOR

 

32

 

 

 

CN3-1

 

 

W

BMS

+

 

33

 

 

0-10V

CN3-2

 

 

BL

IN

-

34

 

 

 

CN3-3

 

 

BK

SYSTEM

+

 

35

 

 

0-10V

CN3-5

 

 

Y/BK

PUMP IN

-

36

 

 

 

 

 

 

 

SHIELD

 

37

 

 

-T

BL

CASCADE

A

 

38

 

 

 

 

 

 

INLET SENSOR

B

 

39

 

 

 

 

 

 

 

 

SHIELD

 

40

 

 

-T

R/W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTLET SENSOR (S9)

 

 

 

 

 

 

-T

R

 

 

 

 

 

 

 

 

 

 

 

 

OUTLET SENSOR (S1)

 

 

 

 

 

 

-T

W

 

 

 

 

 

 

 

 

 

 

 

 

 

FLUE SENSOR

 

 

 

 

 

 

-T

GY

 

 

 

 

 

 

 

 

 

 

 

 

FLUE SENSOR (S10)

 

 

LCD

 

 

 

-T

GY

 

 

 

 

 

 

 

 

DISPLAY

 

 

PRE-MIX SENSOR 1 (S11)

 

 

 

 

 

 

 

 

 

 

 

-T

BR

 

 

 

 

 

 

 

 

 

 

 

 

PRE-MIX SENSOR 1 (S13)

 

 

 

 

 

 

-T

BK

 

 

 

 

 

 

 

 

 

 

 

 

PRE-MIX SENSOR 2 (S12)

 

 

 

 

 

 

-T

T

 

 

 

 

 

 

 

 

 

 

CN3

 

PRE-MIX SENSOR 2 (S14)

 

 

 

 

 

 

 

 

 

DU941

 

 

 

 

 

 

 

CN1

 

 

 

 

 

 

 

SMALL CONNECTION BOARD

 

 

 

ALARM

 

1

 

 

 

 

CONTACTS

 

2

 

 

 

 

RUN-TIME

 

3

CN1-4

 

 

R

CONTACTS

 

4

CN1-5

 

 

R

 

 

 

 

 

TANK

 

5

CN1-6

 

 

OR

THERMOSTAT

 

6

CN1-12

 

 

OR

ENABLE

R

7

CN1-10

 

 

BL

W

8

CN1-11

 

 

BK

 

 

 

 

LOUVER

 

9

CN1-9

 

 

BR

PROVING

 

10

CN1-8

 

 

R

24 VAC LOUVER

 

11

CN1-7

 

 

Y

RELAY COIL

 

12

CN1-1

 

HIGH LIMIT

OR

AUX

 

13

CN1-2

 

 

 

 

SWITCH

 

SWITCH 1

 

14

CN1-3

 

R

BL

AUX

 

15

 

 

 

R

SWITCH 2

 

16

 

 

 

 

 

 

 

 

 

 

LWCO

 

 

 

 

 

 

 

BOARD

 

 

 

 

 

 

 

J3-6

 

 

 

LWCO

TEST

 

J3-5

 

 

 

 

J3-4

OR

 

 

PROBE

SWITCH

 

 

 

 

OR/BK

OR/BK

J3-3

 

 

 

 

LWCO RESET

 

J3-2

 

 

 

 

 

OR

J2-1

 

 

 

 

 

OR

 

J2-2

 

 

 

 

GPS1

OR

 

OR

BR

 

 

 

GPS2

 

GPS3

 

 

 

BLOWER PROVING

OR

 

 

 

 

 

 

 

 

 

SWITCH (LARGE)

 

 

 

 

 

 

BLOWER PROVING

 

T

 

 

 

 

 

 

 

 

 

 

SWITCH (SMALL)

 

 

 

 

 

 

 

 

 

PR

 

 

 

 

BLOCKED FLUE

 

 

 

 

 

 

 

SWITCH

 

 

 

 

 

 

 

 

 

BK

 

 

 

 

BLOCKED DRAIN

 

 

 

 

 

 

 

SWITCH

 

 

 

 

 

 

 

 

 

"X5"

 

 

 

 

 

 

BLOCK WIRING

 

 

 

 

 

 

IS MODEL

 

 

 

 

 

 

DEPENDANT

 

INTEGRATED CONTROL

X8-20

 

X8-10

 

X7-8

 

X7-7

 

X8-13

 

X8-14

 

X8-12

 

X8-11

 

X8-5

 

X8-15

 

X8-6

 

X8-16

 

X8-7

 

X8-17

 

X8-18

 

X8-1

 

X8-3

 

X8-8

 

X8-2

 

X8-4

 

X8-9

X1-6

 

 

X1-3

X7-1

X1-12

 

X10-1

X7-5

X10-4

X1-1

 

X1-2

X7-2

X1-4

X10-2

 

X7-6

X10-5

 

X10-3

 

X10-6

 

X6-18

 

X6-8

 

X1-8

X4

 

X3-3

 

X3-4

X6-9

X3-1

X6-17

X3-2

 

X6-1

X2-4

X6-11

 

X6-2

 

X6-14

 

X6-10

 

X6-13

 

X6-4

 

 

X13-2

 

X13-3

 

X2-3

 

X1-7

X6-3

X1-10

 

X1-5

 

X2-5

X6-5

 

X6-15

 

 

X13-4

X6-12

 

X13-1

 

X6-6

 

X5-1

 

X5-7

 

X5-2

X11

X5-8

 

X5-3

USB

X5-9

INTERFACE

X5-4

 

X5-10

 

X5-5

 

X5-41

 

X5-6

 

X5-12

 

LOW VOLTAGE 120 VAC HIGH VOLTAGE

 

 

 

 

1.5A EACH MAX

 

 

 

 

SYSTEM PUMP

 

120V

 

CONTACTOR

 

 

BOILER PUMP

 

SUPPLY

 

 

GND

 

CONTACTOR

 

L

N

 

DHW PUMP

 

 

 

 

CONTACTOR

 

 

 

 

JUNCTION

 

 

 

 

BOX

 

BK

 

 

 

 

ON/OFF

 

 

 

 

SWITCH

 

 

 

 

BK

 

 

 

 

W

 

 

 

 

G

 

 

 

 

PR

 

 

 

 

T

 

 

 

 

OR

 

 

 

 

OR

 

 

GAS VALVE

 

 

 

 

 

BL

 

 

(SMALL)

 

 

 

 

 

R

 

 

GAS VALVE

 

 

 

 

 

BL

 

 

(LARGE)

 

 

 

 

 

R

 

 

 

 

BK

 

 

 

GY

 

 

 

 

 

 

 

BK

 

SMALL

 

 

 

 

BLOWER

 

 

1 2 3

 

RELAY

 

 

 

 

 

 

BLOWER

 

 

 

 

(SMALL)

 

 

 

 

1 2 3 4 5

 

W

 

 

 

 

T

 

 

 

T

 

 

 

 

 

BK/W

 

 

G/W

 

LARGE

 

 

 

 

BLOWER

R/W

1 2 3

 

RELAY

 

 

 

 

 

 

 

 

BLOWER

 

 

 

 

(LARGE)

 

 

BK/W

 

1 2 3 4 5

 

 

 

 

 

W/BK

 

 

 

 

T

 

 

 

R

 

 

FLAME SENSE 2

R

SPARK

 

SPARK ROD

R

GENERATOR

 

 

 

 

P

 

 

FLAME SENSE 1

 

FLUE DAMPER

 

 

 

 

TRANSFORMER

 

 

 

BK

 

 

 

 

 

 

 

 

FLUE DAMPER GND

 

 

BL

 

1

 

 

 

 

M

 

 

Y

 

2

 

 

OR

 

3

 

 

 

24V

 

 

TRANSFORMER

 

 

BL

 

 

 

 

Y

 

 

Notes:

1.All wiring must be installed in accordance with: local, state, provincial and national code requirements per either N.E.C. in USA or C.S.A. in Canada.

2.If any original equipment wire as supplied with the appliance must be replaced, it must be replaced with wire having same wire gauge (AWG) and rated for a minimum of 105°C. Exceptions: Replacement high vo ltage spark lead and ribbon cables must be purchased from the factory. Use of a non-approved spark lead or ribbon cables can lead to operational problems which could result in non-repairable damage to the integrated controller or other components.

3.Actual connector block locations may vary from those shown on diagrams. Refer to actual components for proper connector block locations when using diagrams to troubleshoot unit.

WIRING DIAGRAM LBL20280 REV A

59

Page 58 Page 60
Image 59
Page 58 Page 60
Contents Save this manual for future reference Contents Please read before proceeding When servicing boilerBlowers Crest How it worksCrest How it works Models 1.5 2.0 2.5 3.0 Crest Ahri Rating RatingsBefore locating the boiler, check Installation must comply withRecommended clearances for service access Determine boiler locationPrevent combustion air contamination Provide air openings to roomFlooring and foundation Vent and air pipingAreas likely to have contaminants When using an existing vent system to install a new boilerProducts to avoid When removing a boiler from existing common vent system Remove boiler from wood pallet 7Combustion Air from Outside Single Opening Minimum Recommended Combustion AIR Supply to Equipment Room Optional room air General ventingDirect venting Air inlet pipe materials Install vent and combustion air pipingAir intake/vent connections Approved Stainless Steel Vent Manufacturers Make ModelRemoving from existing vent Common venting Prepare roof penetrations Vertical direct ventingVent/air termination vertical Determine location4Alternate Vertical Terminations with Multiple Boilers Multiple vent/air terminationsVent/air termination sidewall Sidewall direct venting2Clearance to Doors and Windows Prepare wall penetrations4Multiple Vent Terminations must also comply with Figure Room airHydronic piping 20F 40F 60F Circulator sizingModel Near boiler piping components Ball Valve Multiple Boilers Common Header Primary / Secondary Flow For all equipment and detailing required by local codes AIR Seperator Drain Port Typical System Supply Sensor Model Gas Inlet Size Connecting gas supply pipingGas connections Propane Gas Natural gasCheck inlet gas supply GAS Piping Size ChartGas Pressure Gas valve replacementLine voltage connections Field wiringInstallation must comply with Low voltage connections EnableOutdoor temperature sensor Louver proving switchSystem supply sensor Auxiliary switch 1Alarm contacts Wiring of the cascadeField WiringCondensate drain Condensate disposalFill and test water system Freeze protection when usedStart-up Check/control water chemistryInspect/check condensate lines and fittings Check for gas leaksCheck thermostat circuits Inspect condensate systemCheck system and boiler Final checks before starting the boilerStart the boiler If boiler does not start correctlyFor Your Safety Read Before Operating Gas Natural Gas Propane Valve Set space heating operationSet clock Verify HWG circulator mode Set HWG target temperatureConfiguration of the cascade General Operating informationProtection features Outdoor reset operation, if used Boiler temperature regulationCascade Sequence of operation Home Screen Crest control module2Main Menu Screen See the Crest User’s Information Manual for Instructions Maintenance Maintenance and annual startupService technician Owner maintenanceMaintenance Check boiler relief valve Flue vent system and air pipingCheck water system Check expansion tankCheck flame signal Check ignition ground wiringCheck all boiler wiring Check control settingsNiosh stated First Aid Cleaning boiler heat exchangerReview with owner Handling ceramic fiber materialsIntegrated Control Diagrams2Wiring Diagram
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The Lochinvar 2, 3, 3.5, and 2.5 models are a standout lineup in the realm of commercial and residential water heating solutions. Known for their advanced technology and high efficiency, these units cater to a wide range of applications, ensuring optimal performance and reliability.

One of the key features of the Lochinvar models is their robust construction. Each unit is designed to withstand rigorous operational demands while providing excellent thermal efficiency. They are equipped with stainless steel heat exchangers, which offer superior resistance to corrosion and extend the lifespan of the equipment. This durability is essential for both commercial and residential settings where demand can vary significantly.

The Lochinvar 2, 3, 3.5, and 2.5 models utilize innovative control systems that enhance their operational efficiency and user convenience. The built-in Smart Control technology allows for easy monitoring and adjusting of system parameters, ensuring that users can maintain optimal performance with minimal effort. This feature is especially beneficial in commercial settings where large volumes of hot water are required, as it enables users to effectively manage their energy consumption.

Energy efficiency is another hallmark of the Lochinvar lineup. With high-efficiency ratings, these models help reduce energy costs significantly, making them an environmentally friendly option for heating water. The use of advanced combustion technology ensures that these units can deliver maximum heat output with minimal fuel consumption.

Additionally, the Lochinvar models are designed with safety and reliability in mind. They feature multiple safety controls and diagnostics that alert users to potential issues before they escalate, providing peace of mind. The integration of advanced venting options allows for flexible installation configurations, accommodating various building layouts and space requirements.

In summary, the Lochinvar 2, 3, 3.5, and 2.5 models define modern water heating technology with their combination of durability, efficiency, and advanced features. With their innovative design and user-friendly controls, they meet the demanding needs of both commercial and residential users, making them a top choice in the water heater market. Whether for new installations or replacements, these units deliver reliable performance and value.
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