Rheem Guardian PowerVent Training Manual
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Rheem Guardian PowerVent Training Manual

Rheem Guardian PowerVent Training Manual

Electronic spark to pilot gas (fvir) water heaters
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  • Page 2: Table Of Contents

    Guardian PowerVent Training Manual SVC900; Rev 1 Guardian PowerVent Training Manual Flammable Vapor Ignition resistant (FVIR) compliant PowerVent water heater manufactured after 1 January 2006 Table of Contents ..........................3 NTRODUCTION ............................3 AFETY ..........5 OMPONENTS OF UARDIAN OWER...
  • Page 3 Index of Figures Figure 1 – Components of Guardian PowerVent Burner Assembly..........7 Figure 2 – Components of a Guardian PowerVent Water Heater ..........8 Figure 3 – Wiring Harness Connection Diagram ................. 10 Figure 4 – Flash Code LED ......................17 Figure 5 –...

  • Page 4: Introduction

    The terms and component parts used in this manual are current manufactured items or vendor provided items used in Rheem PowerVent gas water heaters, whether natural or liquid petroleum (L.P.). Exercise care when installing and repairing gas water heaters.
  • Page 5 Guardian PowerVent Training Manual SVC900; Rev 1 There is a hot water scalding potential if the thermostat is set too high. The temperature of the water in the heater is regulated by the adjustable thermostat located inside the control enclosure.

  • Page 6: Components Ofa Guardian Power Vent Water Heater

    Exception: Elevation of ignition sources are not required for appliances that are listed as flammable vapor resistant and for installation without elevation. Residential Guardian PowerVent Certification Standards The Guardian PowerVent meets the following manufacturing, certification, energy efficiency and Low NOx standards: • ANSI Z21.10.1-2004 – manufacturing and flammable vapor resistance standard •...
  • Page 7 Guardian PowerVent Training Manual SVC900; Rev 1 Cold Water Inlet – Supply pipe that delivers cold water from the main supply to the water heater. Combustion Air Inlet Openings – Air pathway on the outer jacket with small holes. The holes are designed to trap lint, dust and oil that would naturally accumulate inside the combustion chamber.

  • Page 8: Figure 1 - Components Of Guardian Powervent Burner Assembly

    Guardian PowerVent Training Manual SVC900; Rev 1 Thermal Release Device – (TRD) Mechanism that detects and trips in the presence of high heat inside the combustion chamber. This higher than normal heat could mean a flammable vapor incident or the creation of carbon monoxide.

  • Page 9: Figure 2 - Components Of A Guardian Powervent Water Heater

    Guardian PowerVent Training Manual SVC900; Rev 1 Figure 2 – Components of a Guardian PowerVent Water Heater Page 8...

  • Page 10: Definitions

    Guardian PowerVent Training Manual SVC900; Rev 1 EFINITIONS • Automatic Restart Time - The period of time between a lockout and the automatic action to initiate another ignition period. (60 minutes) • Flame-Establishing Period - The period of time between initialization of gas flow and proof of the supervised flame.

  • Page 11: Lockouts

    Guardian PowerVent Training Manual SVC900; Rev 1 OCKOUTS Internal Lockout - As the control performs its various control checks of the microprocessor’s function and feedback circuitry it detects a fault condition. The control will respond by de- energizing all outputs and entering a lockout. The control will lockout if a failure is detected within the control or it recognizes flame when none should be present.

  • Page 12: Sequence Of Operations

    Guardian PowerVent Training Manual SVC900; Rev 1 EQUENCE OF PERATIONS All voltage inputs are 120V. Neither a surge protector nor GFI circuit is recommended or required. All electrical connectors are Molex and fit one way. The word ‘control’ in this sequence will normally refer to the electronic control module on the gas valve.
  • Page 13 Guardian PowerVent Training Manual SVC900; Rev 1 Turn temperature dial to The white triangle next to temperature selection. WARM is the 120-degree setting. Temperature is sensed electronically by the Thermistor in the sensing bulb. It is the two white wires at the RED Molex connector.
  • Page 14 Guardian PowerVent Training Manual SVC900; Rev 1 (2nd Safety) In normal operation, the Control turns on blower control checks for a closed motor. This creates enough vacuum switch within 12 venting to close the vacuum seconds before starting the safety switch.
  • Page 15 Guardian PowerVent Training Manual SVC900; Rev 1 Main valve on gas valve The “trial for ignition” will opens. last for 75 seconds. If the control is not able to You will have 120V at the establish a pilot flame, it will blue #6 main valve wire.
  • Page 16 Guardian PowerVent Training Manual SVC900; Rev 1 Water is heated. Thermostat In stand-by mode, the and control module shuts control module constantly off all power to the unit. monitors the water Unit is in stand-by mode. temperature via the thermistor to ensure the...

  • Page 17: Table 2 - Sequence Of Operations

    Guardian PowerVent Training Manual SVC900; Rev 1 ECO High Limit:(>200 The high limit switch opens after flame is established. That means the water in the tank got over 200 The pilot valve, main valve, and spark ignition are turned off, but the blower will remain on.

  • Page 18: Timing And Settings

    IAGNOSTIC LASH ODES Another new feature of the Guardian PowerVent is the LED diagnostics system built into the control module. When the unit faults, the LED will flash a certain number of times. A flashing green LED diagnostic code indicates that a sequence of events has forced a lockout condition and is in a lockout state.

  • Page 19: How T O Interpret The Flash Codes

    Guardian PowerVent Training Manual SVC900; Rev 1 The LED will have a variety of status conditions: • ON is defined as constantly on with no blinking patterns. • Slow Blink is defined as a one blink per second. • Fast blink is defined as five blinks per second.
  • Page 20 Guardian PowerVent Training Manual SVC900; Rev 1 ignitor. The control will lockout if it failed to ignite gas after three (3) ignition attempts. Here is how it works: 1. Verify control valve is ON. 2. Verify there is gas to the valve.
  • Page 21 Guardian PowerVent Training Manual SVC900; Rev 1 venting is blocked, then there is no power thru the vacuum safety switch to the control module and pilot valve. Venting over-temperature switch will be another cause of this failure. 1. Check for rubber vacuum hose and crimping.

  • Page 22: Figure 5 - Blower Motor

    LOWER OTOR The blower motor on the Guardian PowerVent is responsible for all fresh combustion air entering the combustion chamber. There are two different blowers and may not be interchanged between products. The short blower goes on only short models and the tall blower and goes on the tall models.

  • Page 23: How T O Check The Vacuum Switch

    Guardian PowerVent Training Manual SVC900; Rev 1 HECK ACUUM WITCH At beginning of a call for heat, the vacuum switch is OPEN. If the blower motor is not working, then check: 1. Vacuum switch tubing is not kinked and connected.

  • Page 24: How T O Check The Eco (Energy Cut - Off )

    Guardian PowerVent Training Manual SVC900; Rev 1 Verify temperature calibration: Measure the resistance value of the thermistor by measuring between the two white wires of the red Molex connect. Make sure the connector is not attached to the control module or you will get a false reading.

  • Page 25: Ow To Heck He Ent Ver Emperature Afety Witch

    The gas valve control board logic is proprietary to Rheem. Three times (cycles) and the valve locks out on the respective code. In some instances, the control will reset by cycling the power to the control valve.

  • Page 26: How To Check The Electronic Gas Control

    Guardian PowerVent Training Manual SVC900; Rev 1 5. Check ignitor gap of 1/8 inch between probe and hood. Check ignitor for cracks and other damage. Replace ignitor assembly Figure 10 – Ignitor Assembly OW TO HECK THE LECTRONIC ONTROL Checking the electronic gas control is a function of “power in means power out”. If the unit is plugged into an electrical source and turned on at the on/off switch, then there is always power to the control module.

  • Page 27: How To Check The Flammable Vapor Sensor

    Guardian PowerVent Training Manual SVC900; Rev 1 OW TO HECK THE LAMMABLE APOR ENSOR The Flammable Vapor (FV) Sensor can operate between F and 150 F with relative humidity between 10% and 95%. The sensor works by absorbing flammable vapors (or hydrocarbons) in a passive mode.

  • Page 28: Table 6 - Venting The Guardian Powervent

    Two (2) None 90.00 Two (2) One (1) 87.50 Three (3) None 85.00 Three (3) One (1) 82.50 Four (4) None 89.00 Four (4) One (1) 77.50 Five (5) None 75.00 Table 6 – Venting the Guardian PowerVent Page 27...

  • Page 29: Troubleshooting Table

    Guardian PowerVent Training Manual SVC900; Rev 1 ROUBLESHOOTING ABLE NATURE OF POSSIBLE CAUSES WHAT TO DO TROUBLE No Hot Water 1. Electrical supply turned off Check fuse panel and on/off switch at blower motor. Verify proper continuity on wall plug (control will flash 4/1).
  • Page 30 Guardian PowerVent Training Manual SVC900; Rev 1 Unable to light pilot 1. Gas supply turned off Turn on gas supply; turn on gas valve. (but I can hear the 2. Gas control valve is damaged. Makes sure the white Molex spark ignitor) connector is tight.

  • Page 31: Table 7 - Guardian Powervent Troubleshooting Table

    Milky water Aerated water Allow a glass of hot water to set for a few minutes. If the water turns clear, the condition is a natural occurrence. Table 7 – Guardian PowerVent Troubleshooting Table Page 30...

  • Page 32: How To Remove The Guardian Power Vent Inner Access Door

    Guardian PowerVent Training Manual SVC900; Rev 1 OW TO EMOVE THE UARDIAN OWER NNER CCESS 1. Shut off gas supply to water heater. Turn gas valve to OFF. 2. Remove jacket door. 3. Unscrew the pilot supply tube (7/16”) and the main gas supply tube (3/4”), and remove the...
  • Page 33 Guardian PowerVent Training Manual SVC900; Rev 1 9. Check main supply tube and pilot supply tube at the gas control valve for gas leaks with a soap and water solution. Bubbles indicate a leak. Tighten all connections if a leak is found.

  • Page 34: How To Remove The Guardian Power Vent Pilot Igniter Assembly

    Guardian PowerVent Training Manual SVC900; Rev 1 OW TO EMOVE THE UARDIAN OWER ILOT GNITER SSEMBLY 1. Shut off gas supply to water heater. Turn gas valve to OFF. 2. Unscrew the pilot supply tube (7/16”) and the main gas supply tube (3/4”), and remove the ignitor wire from the gas control valve.
  • Page 35 Guardian PowerVent Training Manual SVC900; Rev 1 7. Install the new pilot igniter assembly by threading the loose ends of the assembly thru the door hole and pushing the orange grommet into the hole from the backside. Reattach the assembly to the mounting bracket with the Phillips screw.

  • Page 36: How To Remove The Guardian Power Vent Gas Control

    Guardian PowerVent Training Manual SVC900; Rev 1 OW TO EMOVE THE UARDIAN OWER ONTROL 1. Turn gas valve to OFF. Shut off the gas to the unit. Shut off the water supply to the unit. Remove jacket door. Remove gas line.
  • Page 37 Guardian PowerVent Training Manual SVC900; Rev 1 7. Close drain valve; remove hose and turn water back on. Allow unit to refill. Leave T&P open until water comes out the drain line. Open a hot water faucet and allow it to run for about 30 seconds.

  • Page 38: How To Replace The Guardian Power Vent Vent Over Temp Switch

    Guardian PowerVent Training Manual SVC900; Rev 1 OW TO EPLACE THE UARDIAN OWER WITCH 1. Turn the unit off and unplug the heater. If not, you could be shocked with 120 volts of electricity. 2. Unscrew the over temp switch on the draft hood.
  • Page 39 Guardian PowerVent Training Manual SVC900; Rev 1 8. Connect one lead to the vacuum switch; the other lead to the control panel. 9. Connect the heat sensor to the draft hood. 10. Reconnect green grounding wire. 11. Replace control box on blower motor housing and re-install the nuts.

  • Page 40: How To Replace The Guardian Power Vent Vacuum Switch

    Guardian PowerVent Training Manual SVC900; Rev 1 OW TO EPLACE THE UARDIAN OWER ACUUM WITCH 1. Turn the unit off and unplug the heater. If not, you could be shocked with 120 volts of electricity. 2. Unscrew the vacuum switch on the control housing and remove the tubing.

  • Page 41: How To Replace The Guardian Power Vent Electronic Control Module

    Guardian PowerVent Training Manual SVC900; Rev 1 OW TO EPLACE THE UARDIAN OWER LECTRONIC ONTROL ODULE 1. Turn the unit off and unplug the heater. If not, you could be shocked with 120 volts of electricity. 2. Turn the gas valve to OFF Remove...
  • Page 42 Guardian PowerVent Training Manual SVC900; Rev 1 6. Remove and discard the old plastic grey module. 7. Place new electronic module in position and press firmly to engage locking tabs. 8. Replace TORX 15 screw. 9. Reconnect Molex connectors in accordance with connection diagrams.

  • Page 43: How To Replace The Guardian Power Vent Flammable Vapor (Fv) Sensor

    Guardian PowerVent Training Manual SVC900; Rev 1 11. Turn water heater on at blower motor. 12. Set thermostat setting not to exceed and check main burner operation. (FV) OW TO EPLACE THE UARDIAN OWER LAMMABLE APOR SENSOR 1. Turn the unit off and unplug the heater.
  • Page 44 Guardian PowerVent Training Manual SVC900; Rev 1 5. Unthread wires from retainer clips on main burner supply tube. 6. Gently grab and pull the sensor from the mounting hole. Unthread the remainder of the wiring harness. 7. Replace in reverse order.

  • Page 45: Reset Procedures For Invensys Control

    Guardian PowerVent Training Manual SVC900; Rev 1 ESET ROCEDURES FOR NVENSYS ONTROL 1. Inspect the installation/location for the presence of materials that could produce flammable vapors (ex: gasoline, cleaning compounds, paints/solvents) or the presence of bleach or ammonia. Remove any of these materials and thoroughly ventilate the area where water heater is located.

  • Page 46: White Rodgers Gas Valve

    ALVE Effective October 2007, we transitioned to the White Rodgers Thermostat Control for our standard Guardian PowerVent residential gas water heaters. This change affected both natural and LP gas models. Below is the troubleshooting step for each potential error code. In the event you display the code for a flammable vapor event, please call the technical support line.
  • Page 47 Guardian PowerVent Training Manual SVC900; Rev 1 Error 4 Indications Display The pressure switch remained open longer than 5 seconds after the combustion blower energized. Troubleshooting 1. The pressure switch wiring is incorrect or disconnected. 2. The pressure switch tubing in not connected correctly or pinched off.
  • Page 48 Guardian PowerVent Training Manual SVC900; Rev 1 and looking thru sight glass window. If you have a glowing ignitor, then your problem is probably fuel related.) 5. Thermal Release Device is damage or missing. No oxygen in combustion chamber. 6. Inadequate fresh air to support combustion inside combustion chamber.
  • Page 49 Guardian PowerVent Training Manual SVC900; Rev 1 Error 10 Indications Display Flame signal sensed out of proper sequence. ( The flame probe sensed fire when it was not suppose to.) Troubleshooting 1. Cycle power to the water heater off for 10 seconds and then back on.
  • Page 50 Guardian PowerVent Training Manual SVC900; Rev 1 Error 14 Indications Display The self-diagnostic test found a problem with the Flammable Vapor Sensor. (This is not a flammable vapor event. It may be caused by disconnecting the FV sensor Molex, or the FV sensor itself. This includes both short and open electrical connections.)
  • Page 51 Guardian PowerVent Training Manual SVC900; Rev 1 Error 15 Indications Display The control detected the presence of flammable vapors near the water heater and entered lock out. This is a permanent lockout and cannot be cleared by cycling power. Control may be reset.

  • Page 52: Figure 16 - White Rodgers Connection Diagram

    Guardian PowerVent Training Manual SVC900; Rev 1 Figure 16 – White Rodgers Connection Diagram Page 51...

  • Page 53: Reset Procedures For White Rodgers Control

    Guardian PowerVent Training Manual SVC900; Rev 1 ESET ROCEDURES FOR HITE ODGERS ONTROL 1. Inspect the installation/location for the presence of materials that could produce flammable vapors (ex: gasoline, cleaning compounds, paints/solvents) or the presence of bleach or ammonia. Remove any of these materials and thoroughly ventilate the area where water heater is located.
  • Page 54 Guardian PowerVent Training Manual SVC900; Rev 1 The following steps may only be performed after completing the FV Sensor check procedure. 1. Reconnect power to the water heater and turn the unit on. The FV error code will re- appear. Within 30 seconds…...
  • Page 55 Rheem ® Water Heaters Ruud ® Water Heaters 2600 Gunter Park Drive East Montgomery, AL 36109- 14 13 1-800-HEATER3 www.rheem.com ® WATER HEATERS PRINTED IN U.S.A. 01/08 FORM NO. SVC900; Rev 1...

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