Delta PG PLUS-25 Natural GAS, Pipe Sizing Natural Gas, Natural Gas Supply Pressure Requirements

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Gas Piping

NATURAL GAS

Pipe Sizing - Natural Gas

1.Refer to Table 3 for pipe length and diame- ter requirements. Based on rated PER- FORMANCE PLUS input (divide by 1,000 to obtain cubic feet per hour).

-Table 3 is based on Natural Gas with a specific gravity of 0.60 and a pressure drop through the gas piping of 0.30”w.c..

-For additional gas piping sizing infor- mation, refer to ANSI Z223.1. For Canadian installations refer to B149.1 or B149.2.

Natural Gas Supply Pressure Requirements

1.Pressure required at the gas valve inlet supply pressure port:

-Maximum 13”w.c. at flow or no flow conditions to the burner.

-Minimum 5”w.c. during flow condi- tions to the burner. Must be verified during start up and with all gas appli- ances operating.

2.Install 100% lockup gas pressure regulator in the gas supply line if inlet pressure can exceed 13”w.c at any time. Adjust the lock- up pressure regulator for 13”w.c maximum.

WARNING

DO NOT adjust or attempt to measure gas valve outlet pressure. The gas valve is factory-set for the correct outlet pres- sure. This setting is suitable for natural gas and propane and requires no field adjustment. Attempts by the installer to adjust or measure the gas valve outlet pressure could result in damage to the valve, causing potential severe personal injury, death or substantial property damage.

Table 3: Gas piping sizing - Natural Gas

Length of Pipe		Capacity of Pipe in Cubic Feet of Gas Per Hour
in Feet	(based on 0.60 specific gravity, 0.30" w.c. pressure drop)
SCH 40
SCH 40	1/2"		3/4"	1"	1-1/4"	1-1/2"
10	132		278	520	1050	1600
20	92		190	350	730	1100
30	73		152	285	590	860
40	63		130	245	500	760
50	56		115	215	440	670
75	45		93	175	360	545
100	38		79	150	305	460
150	31		64	120	250	380

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Contents For Your Safety PG PLUS-25/30/35/40 Gas Fired Combination HeatersTable of Contents Section VI Vent / Combustion AIR Installation Section V Primary PipingSection Viii Internal Wiring Section IX External WiringSection VII GAS Piping Section X START-UP PreparationSection XI START-UP Procedures Section XII Temperature LimitsSection Xiii CHECK-OUT Procedures Section XIV Installation RecordSection Xvii Replacement Parts Product SpecificationsProduct & Safety Information To Protect Against Excessive Temperature and Pressure Homeowner What to do if YOU Smell GASDo not try to light any appliance Operating Restrictions Pre-Installation Items Section I Pre-Installation Items Boiler ReplacementCode Compliance Determining Product LocationPre-Installation Items Residential Garage InstallationsCombustion Air and Venting Section II Combustion Air VentingMethods of Accessing Combustion Air Into a Space Combustion Air and VentingCombustion Air Requirements Air OpeningsOutdoor Combustion Air Equipment Located in Confined Spaces One Permanent Air InletCombination of Indoor and Outdoor Combustion Air Vent SystemRemoval of an Existing Boiler f rom a Common Vent System Hydrostatic Test Procedures Unit Preparation Section III Unit PreparationHandling Instructions Hydrostatic Pressure TestUnit Preparation Completion of Hydrostatic Test and DrainingDomestic Piping Section IV Domestic Piping Domestic Piping Multiple Units Installation Mixing Valve AssemblyDomestic Piping Diagrams TR/SMART Series ApplicationPerformance Plus With Recirculation Performance Plus with Storage Tank Primary Piping Section V Primary Piping Primary Piping Closet Zero Clearance ApplicationsSystem Piping Zone Circulators Sizing Primary PipingSystem Piping Radiant Heating with Mixing Valve Personal injury, death or substantial property damagePrimary Piping Near Appliance Piping Primary piping Zoning with Circulators Primary Piping Low Temperature Radiant System Primary Piping Venting and Combustion Air Installation Section VI Venting General RequirementsVenting and Combustion Air Installation Category IV Vent Termination ClearancesVenting Option Non Direct Vent / Vertical Multiple Vent TerminationsLocating the Combustion Air Inlet Venting Option Direct Vent / Vertical Venting Option Non-Direct Vent / HorizontalVenting Option Direct Vent / Horizontal Horizontal Wall Thimble KitDetermining Piping Lengths Excessive Horizontal Vent RunsVent Appliance Adapters Allowable Equivalent Length Combined Vent and Combustion Air Standard Horizontal Venting Installation Location of Air Inlet Termination Venting and Combustion Air Installation Section VII Gas Piping Recommended Gas Supply PipingNatural Gas Supply Pressure Requirements Natural GASPipe Sizing Natural Gas Propane Gas Supply Pressure Requirements Propane GASPipe Sizing Propane Gas Internal Wiring Section Viii Internal Wiring Wiring must be N.E.C ClassInternal Wiring Factory Wiring SchematicFactory Internal Wiring External Wiring Section IX External Wiring Installation ComplianceOutdoor Temperature Limit Line Voltage ConnectionsExternal Wiring Multiple Zone Field Wiring Using Zone ValvesField wiring with zone circulators Typical Zone Relay Panel Wiring Section X Start Up Preparation Performance PlusFilling the Outer Primary Tank and System Check Low Water Cut-Off Device Check Thermostat Circuit Verify Correct Pressure SwitchAir Shutter Settings Start-Up Procedures Final Checks Before Start-upPerformance Plus Start-up If Performance Plus Does Not Start CorrectlyFor Your Safety Read Before Lighting Following instructions must be followed exactly, a fire orOr loss of life Operating InstructionsNatural Gas Propane Temperature Limits Section XII Temperature Limits Recommended Secondary Thermostat SettingTemperature Limits Section XIII- Check-Out Procedures Section XIV Installation Record Section XV Maintenance Schedule Service TechnicianOwner Maintenance GeneralInspect the Burner Area Section XVI Maintenance ProceduresCheck the Surrounding Area Check Combustion/ Ventilation Air Openings Inspect Vent System and Combustion Air PipingCheck Domestic System Check Expansion TankCheck Temperature / Pressure Relief Valve Check Ignition Wiring and Ground WiringCheck Control Wiring Check Thermostat Limit SettingsReview With Owner Check Burner Flame Flame SignalCheck Combustion Levels Section Xvii Replacement Parts Jacket Components Control Panel Components Electrical Panel Components Burner Components Specifications Graph 1 Performance Plus Pressure Loss Primary Side TTP Brazed Plate Heat Exchangers Maxi-flo Pool and Spa Heat Exchangers