Raypak 302A-902A manual Heater Sequence of Operation, Models 302A, 402A, 502A, 652A, 752A and 902A

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Fig. 28: External LED Indicator Decal

Heater Sequence of Operation

Models 302A, 402A, 502A, 652A, 752A and 902A

1.The black (hot) wire lead goes directly to the main power switch. This black toggle switch is located at the middle front of the control compartment.

2.When the main power switch is placed in the “ON” position, 120 VAC is applied to the 120 VAC termi- nal block on the circuit board and the 120/24 VAC transformer is powered.

3.120 VAC is waiting at the N.O. contacts of the Economaster II pump delay.

4.Terminals L1 and F1 of the ignition module are powered with 120VAC.

5.120 VAC power is also applied to the control power connector on the circuit board.

6.120 VAC power is waiting at relay contacts K-3 to energize the heater blower.

7.The 120/24 VAC transformer outputs 24 VAC.

8.24 VAC is sent to the low water cut-off (optional) and the red power light is energized.

9.24 VAC is applied to the blue power light located on the diagnostic display board.

10.24 VAC is also applied to the red LED safety shut- down light on the front diagnostic board.

11.24 VAC is applied to the alarm circuit (optional). If the E-5 sales option (Alarm) is included a 5 sec- ond time delay relay will not allow the alarm to so-

und unless the circuit stays energized for more than 5 seconds.

12.Power is applied to terminal P1-1 of the U-2 Board. All safeties are verified to ensure that it is safe to operate the heater. The safety compo- nents wired into the diagnostic board are: low water cut-off (optional), blocked vent switch, man- ual vent temp switch (optional), manual reset high limit, low gas pressure switch (optional), high gas pressure switch (optional), and auto-reset high limit (optional).

13.Power is applied to terminal TP-1 of the Economaster II pump delay to energize the circuit board.

14.Once all safeties have been verified to be closed, a 24 VAC signal is output from pin P3-16 of the U- 2 Board.

15.Relay K-1 (N.C.) will now be energized, and opens the N.C. contacts to disable the alarm (optional) and turns off the red safety shutdown light.

16.Pin P1-4 on the diagnostic board will now output a 24 VAC signal to pin 1 of the “standby switch”.

17.The “standby switch” (rocker switch) located at the lower left front of the control compartment is now powered. If the switch is “ON” and there is no call for heat (CFH), the heater is in standby mode.

18.After the standby switch is placed into the “ON” position, a 24 VAC signal is sent to the “enable/disable” connection (normally jumpered).

19.24 VAC switched power is applied to the S24V ter- minal on the ignition module.

20.When the “enable/disable” contacts are closed, the 24 VAC signal travels to pin 1 of the stage 1 connection and waits for a CFH.

21.When a CFH occurs, a 24 VAC signal is sent to the CFH light on the diagnostics panel located on the lower left front of the control compartment.

22.Power is now sent to terminal TP4 of the Economaster II to energize the relay and close the contacts.

23.The heater pump is energized upon relay closure of the Economaster II.

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Contents Installation and Operating Instructions Page Contents Pay Attention to These Terms Model Identification Before InstallationProduct Receipt Ratings and CertificationsComponent Locations Component Locations BackModel # Burners per Stages Fire at Valve General InformationModel # Burners Valve Firing Per Valve Staging Time/Temperature Relationships in Scalds General SafetyWater Time to Produce Serious Temp Burn Equipment Base InstallationInstallation Codes StackingOutdoor Installations Indoor InstallationsClearances Installations1 Canadian Installations2 Reversing Air Filter Combustion and Ventilation AirIndoor Units Direct VentTruSeal Combustion Air InstallationsConventional Combustion Air Supply All Air from Inside the BuildingGeneral Canadian InstallationsWater Piping Reversing Water ConnectionsRelief Valve Piping Hydrostatic Test Cold Water OperationPump Selection Temperature & Pressure GaugeHydronic Heating Min. Flow Max Flow GpmAir-Separation/Expansion Tank Pressure Drop in Feet of Head Feedwater RegulatorPiping Three-Way ValvesPotable Water and Space Heating Pool HeatingAutomatic Chlorinators and Chemical Feeders Winterizing Your HeaterPH of Water Gas SupplyPool/Spa Water Chemistry Water Hardness Total Dissolved SolidsReversing Gas Supply Connection Gas Supply ConnectionTable J Maximum Equivalent Pipe Length Gas Supply Pressure Electrical Power ConnectionsCheck the Power Source Field-Connected ControllersField Wiring Connection Making the Electrical ConnectionsWiring Connections Venting Appliance CategoriesDirect Venting Horizontal Through Support of Vent StackVent Terminal Location Stainless SteelCanadian Installations InstallationsChanging the Flue Outlet Installation Venting Installation TipsVenting Configurations Natural Draft Vertical Venting CategoryModel Venting Vent Size Height Intake Pipe Max. Length TerminationCommon Venting System Min MaxHorizontal Through-the-Wall Venting Category Horizontal Through-the-Wall Venting CategoryMax. Length Venting Vent Size Equivalent Intake Pipe Direct Vent Horizontal Through- the-WallMaterial Direct Vent Vertical Controls Outdoor InstallationFreeze Protection Heater Sequence of Operation Models 302A, 402A, 502A, 652A, 752A and 902AExternal Lights Color Indication Auto Reset High Limit Red Auto reset optionInternal Lights Color Indication Ignition Module Code ConditionHigh and Low Gas Pressure Switches High Limit Manual ResetFlow Switch Operating ControlHigh/Low Gas Pressure Switch Model 10F 20F 30F Min. Flow Max Flow Gpm 87%-Efficiency Boilers Special Instructions Water PipingVenting Appliance Categories Direct Venting Horizontal Through AL29-4CVent Terminal Location Vertical Venting CategoryCondensate Management 100’ Ducted Certified Maximum Combustion Air Air Inlet Model VentingMaterial Vent Length 40’ 752AE Combustion Air 902AE 30’ 80’Direct Vent Horizontal Through- the-Wall 302A 100’ 402A Galvanized Steel 502A 75’ Category 25’ Direct Vent VerticalCertified Vertical Venting Combustion Air Air Inlet 100’ 40’ 752A 902AWiring Diagram START-UP Pre Start-upMain Burner Adjustment Blower AdjustmentStart-Up Follow-Up Safety InspectionLeak Test Procedure Dual-Seat Gas Valves Pilot Turn-Down TestPost Start-Up Check Leak TestLighting Instructions OperationTo Turn Off Gas To Appliance Troubleshooting StepSuggested Minimum Maintenance Schedule MaintenancePreventive Maintenance Schedule Annually WeeklySemi-Annually As RequiredAppendix Inside Air ContaminationLimited Parts Warranty HI Delta Types H and WH Limited Parts Warranty HI Delta Type P

302A-902A specifications

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