Lochinvar 45,000 - 260,000 BTU/HR Outdoor Air Reset Option, Additional Temperature Controls

Page 38

5Electrical connections

Outdoor Air Reset Option

For boilers ordered with the Outdoor Air Reset option, there is an additional control (FIG. 5-5). There are three setting knobs for Shutdown, Outdoor Air Max., and Ratio. There is also a switch to turn the outdoor air shutdown feature On or Off. An O.A. Sensor is also included.

(c)2002 L.C.

55

 

 

CN1

 

 

CN2

 

CN3

 

 

 

 

 

 

 

 

 

 

OJ1

CN7

 

50

60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D4

 

65

O.A. SENSOR

 

 

 

 

 

CN4

C10

CN8

 

 

ON ENABLE

 

 

 

 

 

 

45

 

 

 

 

 

 

 

 

 

 

VR3

 

 

SW1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

70

 

DISABLE

 

 

 

 

 

 

 

 

W1

O.A. SHUTDOWN

 

 

 

 

 

CN5

OJ2

 

SHUTDOWN

 

 

 

 

 

 

 

 

 

 

 

 

R6

R4

C7

 

 

 

 

55

 

 

 

1.0

 

 

 

C9

 

 

 

 

0.9

 

 

 

 

 

CN6

 

 

50

60

 

1.1

 

 

 

 

 

 

 

 

0.8

1.2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

45

65

0.7

 

1.3

 

 

 

J4

 

 

 

 

 

 

 

 

 

 

W3

 

 

 

 

 

VR1

 

0.6

VR2

1.4

 

 

 

R8

 

 

 

 

 

0.5

 

 

 

 

 

 

 

 

40

70

 

1.5

 

 

 

 

 

CN1

 

 

 

W1

W2

 

 

 

 

O.A. MAX.

 

RATIO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CN9

 

160

 

 

 

10 11

 

 

 

 

 

 

 

200

9

 

 

 

10

 

 

140

 

8

 

12

 

 

 

 

 

 

 

 

 

 

 

R15

R16

5

 

 

15

 

 

 

 

7

 

13

 

 

 

 

 

220

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

120

 

 

6

 

14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

VR2

15

 

(F-)0

VR3

20

 

 

 

240

 

 

 

 

OFF

DIFFERENTIAL

 

 

HIGH-FIRE

 

 

SETPOINT

 

TST2314

 

 

 

OFFSET

 

Figure 5-5_Optional Outdoor Air Reset Control

Shutdown

The Shutdown knob specifies the outdoor air lockout temperature at which the control would prevent the unit from operating.

Outdoor Air Max (O.A. Max)

The O.A. Max knob allows a reset up to the maximum outdoor air temperature specified by this knob setting. When the outdoor air temperature is above the specified setting, the unit will not function in the O.A. Reset Mode, but will continue to run at the selected set point temperature.

Note that the set point knob will now indicate the “minimum” boiler temperature. Target temperature is determined by the ratio and outdoor air temperature below the O.A. Max setting.

Ratio

The Ratio knob allows control over the reset ratio to be used during Outdoor Air Reset. The allowable ratios are as low as 0.5:1 or as high as 1.5:1.

Selecting the 0.5:1 ratio will increase the set point 0.5° for every 1.0° drop in outdoor air temperature up to the maximum set point temperature.

Selecting the 1.5:1 ratio will increase the set point 1.5° for every 1.0° drop in outdoor air temperature up to the maximum set point temperature.

38

Installation & Service Manual

If the outdoor design and boiler design temperatures are known, the Ratio setting can be calculated using the following formula:

Ratio = (boiler design temperature - operator set point)

(O.A. Max. setting - outdoor design temperature)

Note that the reset set point cannot exceed the maximum set point of the boiler thermostat.

These settings are illustrated graphically in FIG. 5-6.

Figure 5-6_Outdoor Air Control Example Chart

Outdoor Air Shutdown Enable/Disable Switch

The Outdoor Air Shutdown Enable/Disable switch turns the outdoor air shutdown feature On and Off. Disabling the Outdoor Air Shutdown feature allows the unit to operate regardless of the outdoor air temperature. This is needed for indirect domestic hot water systems for example.

Additional Temperature Controls

High Water Temperature Limit Control

The appliance is supplied with a fixed setting, auto-reset high water temperature limit control. The setting of this control limits maximum discharge water temperature. If water temperature exceeds the setting, the limit will break the control circuit and shut down the appliance. The limit control will only be reset after the water temperature has cooled well below the setting of the limit. The auto-reset high water temperature limit control is mounted in the outlet side of the front header.

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Contents Models 45,000 260,000 Btu/hr Contents Warranty Please read before proceedingCodes Solution Boiler =B=R Rating RatingsSolution How it works Temperature and pressure gaugeSolution How it works Solution How it works Determine boiler location Location of unit3Combustion Air Direct from Outside 6Combustion Air from Outside Single Opening Minimum Recommended Combustion AIR Supply to Equipment Room Vent Pipe Sizes VentingConventional Negative Draft Venting System Venting Vertical Vent Termination Clearances Less from Ridge From Parapet WallVent Materials Masonry Chimney InstallationSidewall Venting Negative Draft Fan Assisted VentingAutomatic Vent Damper 7Vent Damper and Vent Damper Terminal BlockGas Connection Gas connectionsGas Supply Gas Pressure Test Install Piping to Control Gas PipingGas Manifold Pressure Adjustment Procedure 2WrenchChecking Gas Supply Pressure 4Gas Supply PressureTwo Stage Burner Control System Combination Gas ValvesVenting of Combination Gas Valves Relief Valve Water Flow Switch if equippedWater connections Minimum Required Flow For Heating Boiler Typical Heating Boiler InstallationsLow Water Cutoff if equipped General Plumbing RulesSystem Temperature Rise Chart Piping of the Boiler SystemCirculator Pump Requirements Heat Exchanger Pressure Drop ChartWater Connections Circulator Pump Operation Circulator Pump SpecificationsPrimary/Secondary Boiler Piping Boiler Flow Rates Low Temperature Bypass RequirementsFull Flow Application Primary / Secondary Piping Make UP WaterMake UP Water 6Multiple Boilers Zoned with Circulators Full System Flow From System8Single Boiler Full System Flow with Low Temperature Bypass Electrical connections Terminal Strip WiringBoiler Operating Temperature Control Auxiliary Device Connection to Terminal StripTemperature Adjustment AMP Draw DataMaximum SET Point Determination Maximum Set Point DeterminationInstallation of Remote Sensors Outdoor Air Temperature SensorWiring of Remote Sensors Outdoor Air Reset Option Additional Temperature ControlsBlocked Vent and Flame Roll-Out / Flame Interlock Switch 7Blocked Vent Switch LocationInitial Start-up Pre-start ChecklistStart-up Lighting Instructions for Spark Ignition Pilot ModelsTo Turn Off Gas to Appliance Safety Shutoff Test for Spark Ignition Pilot SystemOperating Instructions Water Treatment Intermittent Pilot Spark Ignition SystemFreeze Protection Ignition and Control TimingsOwner maintenance Maintenance Maintenance and annual startupService technician See the User’s Information Manual for instructionsMaintenance Check Expansion Tank Check Relief ValveHeat Exchanger / Burner Access Check All WiringCheck Control Settings Perform Start-up and ChecksInspection and Cleaning Breathing Fresh airGas Train and Controls Review with ownerInspection of Heat Exchanger Waterways Water Circulating PumpTroubleshooting Troubleshooting Guide M9 Solution BoilersWiring Diagram M9 Unit 45,000 260,000 Btu/hr Models DiagramsSchematic Diagram M9 Unit 45,000 260,000 Btu/hr ModelsPage Revision a ECO #C03746 initial release SBR-I-S Rev a

45,000 - 260,000 BTU/HR specifications

Lochinvar, a leader in high-efficiency heating solutions, presents the Lochinvar line of boilers, specifically the Lochinvar 45,000 - 260,000 BTU/HR models. These boilers are designed to meet a wide range of heating demands, making them ideal for residential and commercial applications alike.

One of the key features of the Lochinvar boilers is their impressive efficiency rating. Utilizing advanced condensing technology, these units can achieve efficiencies of up to 96% AFUE (Annual Fuel Utilization Efficiency). This high efficiency not only reduces fuel consumption but also lowers utility bills, making it a cost-effective solution for heating needs.

The Lochinvar boilers are equipped with a powerful heat exchanger constructed from durable stainless steel. This design not only maximizes heat transfer but also enhances the longevity of the unit. By preventing corrosion and minimizing maintenance requirements, the stainless steel heat exchanger ensures that the boiler operates at peak performance for years.

Another significant aspect of the Lochinvar boilers is their modulating burner system. This technology allows the boiler to adjust its output based on demand, ensuring that it only uses the energy necessary to maintain the desired temperature. This feature not only improves efficiency but also contributes to a more comfortable indoor environment by minimizing temperature fluctuations.

The Lochinvar series also showcases a user-friendly control interface. The advanced LCD display allows for easy monitoring and adjustment of system settings. Connectivity options are often included, providing the ability to integrate with modern building management systems for enhanced control and diagnostics.

Safety features abound in the Lochinvar models, which include built-in safeguards such as temperature and pressure relief valves, flame detection systems, and modulation cut-off to protect against overheating and other hazardous conditions.

Moreover, these boilers are designed for easy installation and maintenance. Compact dimensions and lightweight design facilitate straightforward setup, even in tight spaces. Additionally, users can take advantage of the unit’s self-diagnostic capabilities to simplify troubleshooting and reduce downtime.

In conclusion, the Lochinvar 45,000 - 260,000 BTU/HR boilers represent a pinnacle of innovation in heating technology. With high efficiency, advanced control systems, durable components, and safety features, they stand out as reliable and effective solutions for a variety of heating applications, ensuring comfort and efficiency in any environment.
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