PVI Industries PV500-45U manual Sequence of Operation, Incoming 120VAC

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12.2The Following Describes The Functions Of Each Of These Terminals And The Factory-Installed Options Required To Activate The Terminals:

Note: Terminal P1-P2are functional only when the water heater is equipped with the factory installed options required to activate the terminals. Terminals R1-R2, A1-A2,C1-C2and T1-T2are standard pre-wired functions on all models.

R1-R2:Used to activate / de-activate water heater from remote master control.

Terminals are wired to a relay in a remote Energy Management System. When relay closes, circuit from R1 to R2 is completed and appliance controls are enabled. Appliance ships from factory with jumper between terminals Remove jumper when connecting to a remote controller.

A1-A2:Used to activate a remote alarm, signaling shutdown of combustion control.

Provides a maximum 10 amp relay contact closure when the flame safeguard terminates combustion due to a tripped safety interlock (i.e.: air proving switch, high limit switch, low water flow switch or flame sensor, etc.).

P1-P2:Activates remote equipment and requires confirmation signal back to the appliance.

Provides a maximum 10-amp relay contact closure to activate a remote device (i.e.: mechanical room air louvers, draft inducer or power vent, etc.). The remote device must send return signal via proving switch to confirming proper operation to terminals C1-C2, prior to the appliance being able to energize. Options Required - Consult Factory.

C1-C2:Used for proving operation of remote device.

Terminals are wired to a proving switch on a remote device such as a power venter. When relay closes, circuit from C1 to C2 is completed and appliance controls are enabled. This appliance ships form the factory with jumper between terminals.

T1-T2:Used for external modulation control.

To connect external modulation control, disconnect and cap the blue wire connected to terminal T2 and connect the external modulating signal to terminals T1 (positive) and T2 (negative).

13SEQUENCE OF OPERATION

1.Incoming 120VAC

a.Full time power to the Main Control Switch

b.Full time power to the Variable Frequency Drive

2.Power On - When the main control switch is turned on:

a.120v is applied to the step-down transformer (24v)

b.120v is applied to the L.W.C.O. terminal L1 (if used)

c.120v is applied to the Fenwal Flame Safeguard Control

d.24v is applied to the TempTrac operating temperature control terminal L1

3.Call For Heat - If the TempTrac operating control senses a call-for-heat condition:

a.The High Gas Pressure and Low Gas Pressure Switch (both optional) are energized and their safe condition is proved.

b.The thermostat contact on the Fenwal Flame Safeguard Control is energized.

c.The flame control will then verify the Airflow-Proving Switch is in the open position, which must exist before the blower is powered.

d.Energizing the blower should close the airflow proving switch. If the airflow-proving switch is not in the closed position, the flame control’s fan terminals F1-F2 will power the Variable Frequency Drive (VFD) blower system at low speed for pre-purge.

e.If the airflow-proving switch does not close following the blower being energized, the flame control will lockout.

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PV500-45U 06/12

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Contents Installation & Maintenance Manual Table of Contents Temptrac Electronic Controller Panel Operating and Safety ControlsTroubleshooting Guide Replacement Parts Remote Connections Terminal StripSafety Considerations Product Safety InformationBelow scalding temperatures Standard Features and Equipment Series Series Series Codes Water Heater InstallationChecking Equipment Before You Install Electrical RequirementsGeneral Piping Guidelines Service ClearancesClearances To Combustible Surfaces Inlet and Outlet ConnectionsPV500-45U 06/12 PV500-45U 06/12 Optional Condensate Neutralization System Convert Fittings to Equivalent Straight Pipe GAS Supply and PipingInlet Pressure NAT. GAS Nominal Iron Length of Pipe in Straight Feet Single Unit Installation Suggested Pipe SizeMultiple Unit Installations GAS Piping Size Chart InchesCombustion and Ventilation AIR Duct Fitting Equivalent Length Duct Pipe Vertical or Horizontal Remote Air Duct TerminationMaximum Category IV Vent Length Equivalent Length VentingVenting the Tricon Vent Fitting Equivalent Length Vent Pipe Combining Category IV VentsOperating and Safety Controls Temperature and Pressure Relief Valve sElectronic Low Water Cut-Off Optional High Water Temperature Limit ControlCathodic Protection Down Temptrac Electronic Controller PanelSET ClockTo Change Other Parameters To View The SetpointTo Change The Setpoint Recommended Action LED Display Alarm MessagesAlarm Cause Results of Alarm Condition Message Remote Connections Terminal StripSequence of Operation Incoming 120VACLoss of Flame Signal LED Indication Fault ModeInitial Startup Turn-on main gas shutoff valve PV500-45U 06/12 Gas Train Illustration for Models 40 through Gas Train Illustration for Models 65 throughTroubleshooting Guide Problem Probable Cause Corrective ActionReplacement Parts Replacement PartsControl Panel Contact factory for more information Burner Assembly Optional components may or may not be shown Contact factory for more information Item No Qty PVI Part No DescriptionPeriodic Maintenance PV500-45U 06/12 Recommended Maintenance Schedule PV500-45U 06/12 PV500-45U 06/12
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