Delta PG PLUS-25 Verify Correct Pressure Switch, Air Shutter Settings, Check Thermostat Circuit

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Start-Up Preparations

Verify Correct Pressure Switch

1.Remove the burner hood and verify the burner pressure switch setting.

2.Check and compare the color of the out- line on the pressure switch label to Table 3 page 49.

NOTICE

The PERFORMANCE PLUS is equipped with an air pressure switch, which provides a safe means of shutting down the unit due to a blockage of the combustion air inlet. The switch is “nor- mally closed” and measures the change in the negative pressure (vacuum) creat- ed by the burner blower.

Verify Correct Air Shutter Setting

-Check and verify the air shutter setting as listed in Table 4.

-The air shutter is located inside the com- bustion air inlet adapter located in the top /left jacket panel area. See Fig. 37.

Table 4 : Air Shutter Settings

Model	Natural Gas	Propane

PG PLUS-25	2.5	2.5
PG PLUS-30	2.5	2.5
PG PLUS-35	1	2.0
PG PLUS-40	N/R	0
PG PLUS-45	N/R	0

NR- Air shutter not required.

Check Thermostat Circuit

-Unplug the Room Thermostat Snap-set located on the rear of the unit.

-Connect a voltmeter across the end ter- minals of the male half of the Room Thermostat Snap-set.

-Close each thermostat, zone valve and relay in the external circuit one zone at a time and check the voltage reading across the plug.

-There should NEVER be voltage mea- sured at the plug.

-If voltage is measured at the plug under any condition, check and correct the external wiring.

NOTICE

In systems using 3-wire zone valves backfeed of voltage to the unit is a com- mon problem. Use an isolation relay to prevent voltage from the external circuit entering the Room Thermostat Snap-set.

Fig. 37: Air Shutter Adjustment

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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