Lochinvar SNA500-125, SNR200-100, SNA285-125, SNR150-100, SNA400-125 service manual Diagrams, 120 VAC

Page 70

TM

Installation & Service Manual

14 Diagrams

Figure 14-1Ladder Diagram

120VAC

 

 

 

JUNCTION BOX

 

 

NEUTRAL

GROUND

TERMINAL STRIP

 

 

 

 

 

TERMINAL STRIP

 

120V SUPPLY "L"

 

 

 

 

 

120V SUPPLY "N"

 

 

PUMP

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

RELAY

 

 

DHW

 

DHW

 

 

 

4 3

 

 

PUMP "L"

 

PUMP "N"

 

 

 

 

 

 

 

DHW

 

 

 

 

 

 

 

TERMINAL

PUMP

TERMINAL

 

 

 

 

 

 

 

 

 

 

 

 

 

STRIP

 

STRIP

 

 

 

INTEGRATED CONTROL

 

PUMP

 

 

 

 

 

 

 

 

 

 

 

X1-6

F5

 

 

X1-3

RELAY COIL

 

 

 

 

 

 

 

2

1

 

 

 

5A

 

DHW PUMP

 

 

 

 

 

 

 

 

RELAY

 

 

 

 

 

X1-8

 

 

 

 

 

 

 

BOX DEPICTS

 

 

 

 

 

 

 

OPTIONAL ITEMS

 

 

 

 

 

 

BLOWER

 

 

F4

 

 

 

 

 

 

 

 

 

X1-1

 

1

2

LOW VOLTAGE

JUNCTION

3.5A

 

 

 

 

 

BLOWER

 

 

 

 

120 VAC

BOX

 

 

 

 

 

 

F3

 

RELAY

 

 

3

 

 

 

 

 

 

 

HIGH VOLTAGE

 

1.25A

 

 

 

 

 

 

 

120 VAC

X1-5

 

JUNCTION BOX

CONNECTION

 

 

 

 

 

X5-7

F2

 

 

X6-8

 

CN2-4

BOARD

 

 

 

 

 

 

X6-7

3.5A

24 VAC

 

X6-3

 

CN2-10

 

 

X6-2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONNECTION

 

 

 

 

 

 

CN2-6

BOARD

 

CN5-1

 

 

CN5-2

 

INTEGRATED

 

 

 

 

 

 

 

 

 

 

 

LWCO

 

 

 

 

 

 

 

 

CONTROL

 

 

 

 

 

 

 

 

CN2-12

 

 

 

 

CN5-3

CN5-4

 

CN2-11 X6-9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONNECTION

LOW GAS

HIGH GAS

 

 

 

 

 

MANUAL RESET

 

 

 

 

 

 

 

 

 

 

 

 

BOARD

PRESSURE

PRESSURE

 

 

 

 

 

HIGH LIMIT

X5-14

 

 

 

X6-4 CN2-5

 

 

CN4-6

 

SWITCH

SWITCH

CN4-3

CN2-3 X6-5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INTEGRATED

 

 

 

 

 

 

 

CONTROL

 

 

INTEGRATED

 

 

 

 

 

 

 

CONTROL

 

 

 

 

DISPLAY

 

 

 

 

 

 

 

 

 

 

EXTERNAL

2

 

 

 

 

 

 

LIMIT

CN2-9

X6-10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

X3

 

 

 

 

 

 

 

 

RIBBON CABLE

 

AIR PRESSURE

 

PC

 

 

SWITCH

X5-11

 

 

 

 

X8

 

INTERFACE

 

 

 

 

X5-4

 

 

 

 

 

BLOCKED

 

 

 

 

 

X5-8

 

 

 

 

 

S2

DRAIN

 

 

 

 

INLET

 

SWITCH

 

X5-3

 

 

 

 

 

 

 

 

 

SENSOR

 

 

AUTO RESET

 

 

 

 

 

 

X5-1

 

X5-10

 

 

 

S1

 

HI-LIMIT

 

 

 

 

 

 

 

 

 

OUTLET

 

 

 

 

 

 

 

 

 

 

 

 

 

SENSOR

 

 

GAS VALVE

 

 

 

 

 

S3

X5-2

 

X2-2

 

 

FLUE

X5-9

 

 

 

 

 

 

 

 

 

GAS VALVE

 

SENSOR

 

 

 

 

 

 

 

 

 

X2-1

RELAY

 

 

 

 

 

 

 

CONNECTION BOARD

 

BLOWER

 

1

X5-5

 

 

CN4-11 X3-1

 

 

 

 

 

 

 

RUN-TIME

3

CN4-12

X3-3

 

 

2

X5-13

CONTACTS

 

 

 

 

 

 

 

 

 

 

4

CN4-10

X3-4

 

 

4

X5-6

 

 

 

 

 

 

ALARM

5

CN4-4

X3-2

 

 

5

X5-12

CONTACTS

 

 

 

 

 

 

 

 

6

 

 

 

 

TR1

 

 

 

 

 

 

 

X1-7

 

 

 

 

 

SPARK

 

FLAME ROD

 

 

 

 

 

 

 

 

 

 

 

ROD

 

 

 

 

CN4-1

CN3-8

X4-8

 

 

 

 

 

 

 

 

TANK

 

 

 

 

S4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CN4-4

 

CN3-6

X4-6

 

 

 

CAUTION

HIGH VOLTAGE SPARK LEAD

 

 

 

 

SENSOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CN4-5

 

CN3-10

X4-10

 

 

 

 

 

 

 

EXTERNAL

+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0-10V

CN4-2

 

CN3-4

X4-4

 

 

NOTES:

 

CONTROL

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. Where possible, switches are shown without utilities (gas, water or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

electricity) connected to the unit. As such, actual switch states may

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

vary from those shown on diagrams depending upon whether utilities

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

are connected or a fault condition is present.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. See wiring diagram for additional notes.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LADDER DIAGRAM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LBL20026 REV A

70

Image 70
Contents Installation & Service Manual What to do if YOU Smell GASContents Please read before proceeding Hazard definitionsShield How it works BlowerModels SNR150-100 -- SNA285-125 Model SNA400-125 Model SNA500-125Ratings CSADetermine water heater location Installation must comply withCloset and alcove installations Before locating the water heater, check1Closet Installation Minimum Required Clearances Remove water heater from wood pallet Flooring and foundationPrevent combustion air contamination Do not install the Shield water heater into 3Combustion Air Direct from Outside Minimum Recommended Combustion AIR Supply to Equipment Room General venting Direct venting optionsCanada Venting and combustion airVent pipe and fittings Air intake/vent connections Air inlet pipe materialsRemoving from existing vent Vent LengthVent and air piping Vent/air termination sidewall If using the alternate sidewall terminationSidewall direct venting Vent Size2Clearance to Gravity Air Inlets Prepare wall penetrations Alternate Field Supplied Option Prepare wall penetrationsTermination and fittings Multiple vent/air terminations 5AMultiple Vent Terminations must also comply with -1ASidewall termination optional concentric vent Sidewall termination installationDescription and usage 9Concentric Vent Dimensional Drawing 12Concentric Vent Sidewall Attachment Multiventing sidewall terminationsVertical direct venting Vent/air termination verticalPrepare roof penetrations 2Vertical Terminations with Multiple Water HeatersVertical termination installation Vertical termination optional concentric vent6Concentric Vent Roof Installation Multiventing vertical terminationsConventional and sidewall venting 1Vertical Direct Venting w/Room AirScalding System pipingSystem water piping methods General piping informationWater chemistry Piping componentsDelta T Single Unit 3Multiple Units Water Tank Supply Connecting gas supply piping Gas connectionsNatural gas Propane gasCheck inlet gas supply Natural Gas Pipe Capacity ChartLength of Pipe in Straight Feet for 1/2 PSI Gas valve replacement Gas pressureField wiring 3Low Voltage Field Wiring Connections Inputs Condensate disposal Condensate drainCheck for gas leaks Inspect/fill condensate system Start-upFinal checks before starting the water heater Check system and water heater Start the water heaterIf water heater does not start correctly Check flame and combustion2Operating Instructions Models SNR150-100 -- SNA285-125 3Operating Instructions Models SNA400-125 -- SNA500-125 Operating information Temperature controlProtection features GeneralAdjustable control parameters Water heater temperature regulationSaving parameters Sequence of operation HTR IgnitionShield control module 1Control PanelStatus display screens Status Display ScreensStatus Display Screens cont’d Service technician Maintenance Maintenance and annual startupOwner maintenance Maintenance Check expansion tank Flue vent system and air pipingCheck water system Check water heater relief valveCheck control settings Check ignition ground wiring Check burner flameCheck all water heater wiring Check flame signalOiled bearing circulators Cleaning heat exchangerHandling ceramic fiber materials Niosh stated First AidCheck control module fuses TroubleshootingBefore troubleshooting Check the followingUnit Does Not Modulate No DisplayNo Burner Operation Above 50%Checking temperature sensors Temperature F Resistance ΩTroubleshooting Sequence FlameNo Flame Ign GV/Relay No FlameRunning FailFan Low Manual ResetHigh Limit Fan Speed LowFan Speed High SwitchFan High Sensor OpenParameters ProgrLow 24 VAC Service BlkWatch Dog Error Write EEPromOr Obstruction Combustion Analysis ProcedureGas Valve Adjustment Gas Supply PressureModel SNA400-125 Gas valve adjustment procedureModels SNR150-100 -- SNA285-125 Model SNA500-125Diagrams 120 VACLOW Voltage

SNA400-125, SNR150-100, SNA285-125, SNR200-100, SNA500-125 specifications

Lochinvar has established itself as a leader in the realm of high-efficiency heating solutions, and its line of condensing boilers, including the SNA500-125, SNR200-100, SNA400-125, SNA285-125, and SNR150-100, exemplifies the brand’s commitment to innovation, efficiency, and reliability.

The SNA500-125 model stands out with its impressive heating capacity, designed for larger commercial applications. Featuring advanced modulating burners, it can precisely adjust its output based on real-time demand, significantly enhancing energy efficiency. The stainless steel heat exchanger ensures robust durability and improved thermal performance, while the integrated controls offer advanced diagnostic capabilities and user-friendly operation.

Next in the lineup, the SNR200-100 serves as a versatile option for mid-sized applications. Its compact design allows for flexible installation, making it a valuable choice for facilities with limited space. The boiler incorporates a high-efficiency combustion system that maximizes fuel utilization, while its low NOx emissions technology aligns with environmental standards, reducing the carbon footprint of users.

The SNA400-125 delivers a robust solution for diverse heating needs, equipped with state-of-the-art modulation technology that not only optimizes efficiency but also offers quiet operation – a crucial feature for facilities where noise reduction is paramount. This model also includes built-in redundancy options, enhancing reliability during peak operational periods.

The SNA285-125 provides a balance of performance and efficiency for smaller commercial settings. Its innovative control system offers precise temperature management and easy integration with existing systems. Energy Star certified, this model is not only cost-effective but supports sustainability efforts in various industries.

Lastly, the SNR150-100 is ideally suited for light commercial applications, featuring a compact footprint and excellent heat transfer capabilities. The user-friendly interface and robust safety features make it an excellent choice for operators prioritizing both ease of use and reliability.

All these models incorporate Lochinvar's commitment to superior design and advanced technologies, setting a benchmark in the high-efficiency heating market. With a focus on long-term performance and compliance with modern environmental standards, Lochinvar continues to deliver top-tier solutions tailored to meet diverse customer needs. Whether for large-scale operations or smaller settings, these boilers represent a significant advancement in commercial heating technology.