Lochinvar 45000, 260000 Gas connections, Gas Supply Gas Pressure Test, Gas Connection

Page 18

Installation & Service Manual

3Gas connections

Gas Supply

Gas Pressure Test

Verify that the appliance is supplied with the type gas specified on the rating plate. This appliance is orificed for operation up to 2000 feet altitude. The appliance will be derated 4% per 1000 feet above 2000 feet elevation. Consult the factory for installations above 2000 feet elevation. Field conversions for operation at high altitude must be performed by certified personnel only. The appliance will be marked to indicate suitability for high altitude operation.

GAS SUPPLY PRESSURE: Measured at the inlet pressure tap located upstream of the combination gas valve(s) see FIG. 3-5, page 22.

TABLE - 3A

GAS SUPPLY PRESSURE

 

Natural Gas

LP Gas

Max. (Inches Water Column)

 

 

14

14

 

 

 

Min. (Inches Water Column)

4.5

11

 

 

 

Maximum inlet gas pressure must not exceed the value specified. Minimum value listed is for the purposes of input adjustment.

MANIFOLD PRESSURE: Measured at the pressure tap on the downstream side of the combination gas valve(s) (see FIG. 3-5, page 22). The gas regulator settings for single stage and two stage operation are factory set to supply proper manifold pressure for normal operation. To check manifold pressure, see Manifold Adjustment Procedure. Do not increase manifold pressure beyond specified pressure settings shown below in Table 3B.

 

TABLE - 3B

 

 

MANIFOLD PRESSURE

 

 

 

 

 

 

 

Single and

Two Stage

 

Two-Stage

 

 

 

Input Gas

 

 

 

 

Full or High Fire

Low Fire Settings

Btu/hr

Settings

 

 

 

Natural

LP Gas

Natural

LP Gas

 

Gas

 

Gas

 

45,000

3.5"

10"

0.9"

2.5"

 

 

 

 

 

75,000

2.4"

7"

0.9"

2.5"

 

 

 

 

 

90,000 - 180,000

3.5"

10"

0.9"

2.5"

 

 

 

 

 

215,000 - 260,000

3.5"

10"

0.9"

2.5"

 

 

 

 

 

18

1.The appliance must be disconnected from the gas supply piping system during any pressure testing of that system at a test pressure in excess of 1/2 PSIG (3.5kPa).

2.The appliance must be isolated from the gas supply piping system by closing a manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG (3.5kPa).

3.The appliance and its gas connection must be leak-tested before placing it in operation.

Gas Connection

1.Safe operation of the appliance requires properly sized gas supply piping. See data in Table 3C.

2.Gas pipe size may be larger than appliance gas connection.

3.Installation of a union is suggested for ease of service, see FIG. 3-1 on page 19.

4.Install a manual main gas shutoff valve, outside of the appliance gas connection and before the gas valve or manifold connection, when local codes require.

5.A trap (drip leg) MUST be provided by the installer in the inlet of the gas connection to the appliance, see FIG. 3-1 on page 19.

6.The combination gas valve has an integral vent limiting device and does not require venting to atmosphere, outside the building.

7.Optional gas controls may require routing of bleeds and vents to the atmosphere, outside the building when required by local codes.

TABLE - 3C

FITTINGS TO EQUIVALENT STRAIGHT PIPE

Diameter Pipe (inches)

3/4

1

1 1/4

1 1/2

2

3

4

5

 

 

 

 

 

 

 

 

 

Equivalent Length of Straight Pipe (feet)

 

 

 

 

 

 

 

 

 

2

2

3

4

5

10

14

20

 

 

 

 

 

 

 

 

TABLE - 3D

GAS CONNECTIONS

Btu/hr

Pipe Size

INPUT

 

 

 

45,000 - 135,000

1/2"

 

 

180,000 - 260,000

3/4"

 

 

Page 17 Page 19
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Page 17 Page 19
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 Venting Conventional Negative Draft Venting SystemVent Pipe Sizes 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 connections Gas Supply Gas Pressure TestGas Connection Install Piping to Control Gas PipingGas Manifold Pressure Adjustment Procedure 2WrenchChecking Gas Supply Pressure 4Gas Supply PressureCombination Gas Valves Venting of Combination Gas ValvesTwo Stage Burner Control System Water Flow Switch if equipped Water connectionsRelief Valve Minimum Required Flow For Heating Boiler Typical Heating Boiler InstallationsLow Water Cutoff if equipped General Plumbing RulesSystem Temperature Rise Chart Piping of the Boiler SystemHeat Exchanger Pressure Drop Chart Water ConnectionsCirculator Pump Requirements Circulator Pump Specifications Primary/Secondary Boiler PipingCirculator Pump Operation Low Temperature Bypass Requirements Full Flow ApplicationBoiler Flow Rates 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 DeterminationOutdoor Air Temperature Sensor Wiring of Remote SensorsInstallation 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 ModelsSafety Shutoff Test for Spark Ignition Pilot System Operating InstructionsTo Turn Off Gas to Appliance 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 Models
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