Bradford White LC2PV50H76N Service Manual
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Bradford White LC2PV50H76N Service Manual

Bradford White LC2PV50H76N Service Manual

Condensing pv series through-the-wall gas water heaters
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Manual 238 51526 00A REV 08/18
Condensing PV Series
Through-The-Wall Gas Water Heaters
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
Through The Wall Models:
RC2PV50H*(N,X)
LC2PV50H76*(N,X)
(*) Denotes Warranty Years
Save this manual for future reference

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  • Page 1 http://waterheatertimer.org/power-vent-water-heater-troubleshoot.html Condensing PV Series Through-The-Wall Gas Water Heaters SERVICE MANUAL Troubleshooting Guide and Instructions for Service (To be performed ONLY by qualified service providers) Models Covered by This Manual: Through The Wall Models: RC2PV50H*(N,X) LC2PV50H76*(N,X) (*) Denotes Warranty Years Manual 238 51526 00A REV 08/18 Save this manual for future reference...

  • Page 2: Table Of Contents

    The Bradford White Condensing PV Series Through-The-Wall Gas Water Heaters Table of Contents Page PV Service Procedure Introduction ..........................4 How to Use This Manual ......................5 Tools Required for Service ....................... 5 Specifications ..........................6 Glossary of Terms ........................6 Vent Tables ..........................
  • Page 3 Condensing PV Series WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, DANGER personal injury, or death. Do not store or use gasoline or other flammable, combustible, or corrosive vapors and liquids in the vicinity of this or any other appliance.

  • Page 4: Introduction

    Condensing PV Series Introduction The new Bradford White residential condensing water heaters are designed to provide reliable performance with enhanced standard features. New design features include reliable spark to pilot ignition system, enhanced diagnostics, simplified servicing, significantly quiet operation and additional vent lengths.

  • Page 5: Tools Required For Service

    In some difficult to diagnose conditions, it may be necessary to isolate the heater from the vent system to determine the problem. Contact the Bradford White technical support group immediately if diagnosis cannot be made using the methods described in this service manual.

  • Page 6: Glossary Of Terms

    Condensing PV Series Power supply Dedicated 115 VAC, 60 Hz, 15A. Gas Supply Pipe Minimum 1/2” NPT (schedule 40 black iron pipe recommended). Approved Gas Natural Gas or Propane, unit must match gas type supplied. Type 5.0” w.c. min. for Natural Gas, 11.0” w.c. min. for Propane, 14.0” w.c. maximum Gas Pressure (Natural Gas &...

  • Page 7: Vent Tables

    Condensing PV Series Vent Tables 2" Diameter (5.1 cm) Vent Connector Lengths # of Maximum Straight Minimum Straight Terminating Elbows Length ft. (m) Length ft. (m) Through the Wall 45 (13.7) 2 (.6) Through the Wall 40 (12.2) 2 (.6) Through the Wall 35 (10.7) 2 (.6)
  • Page 8 Condensing PV Series Vent Tables 4" Diameter (10.2 cm) Vent Connector Lengths # of Maximum Straight Minimum Straight Terminating Elbows Length ft. (m) Length ft. (m) Through the Wall 180 (54.9) 10 (3.1) Through the Wall 175 (53.3) 10 (3.1) Through the Wall 170 (51.8) 10 (3.1)

  • Page 9: Control Timings

    Condensing PV Series Control Timings Ignition State Timing Pre-purge 2 Seconds Trial for Ignition 90 Seconds Flame Stabilization Period 3 Seconds Inter-purge 15 Seconds Flame Failure Response Time 1.5 Seconds (2 second maximum; 1 second minimum.) Post-purge 15 Seconds PS Fault Delay (failed open/close) Retry after 2 minutes Soft Lockout Retry after 5 minutes...
  • Page 10 Condensing PV Series Power Up Sequence 1. Start Up. Upon power up, the control runs a safe-start check with a typical start-up delay of 5 seconds. 2. Flammable Vapor. To assure no outputs are energized if the “Simulated Resistive Device”, is out of range, the control will test the “Simulated Resistive Device”...
  • Page 11 Condensing PV Series Normal Heating Sequence (cont.) 7. Steady state operation. During steady state operation, the control monitors: Thermostat temperature sensor-when the set point temperature is satisfied, the gas valve is shut down and the blower will post purge for 15 seconds. The control LED flashes a short flash once every 4 seconds (idle) status code.
  • Page 12 Condensing PV Series Abnormal Operation (cont.) times, then 3 times twice with 3 second pauses. The error self clears if the fault clears for at least 15 seconds. c. Water temperature in excess of ECO (Energy Cut Out) limit -The gas control immediately turns off the pilot &...
  • Page 13 Condensing PV Series Abnormal Operation (cont.) blower through post purge and flashes 6 times, then once with a 3 second pause. The control waits 5 minutes before repeating the ignition sequence. 5. Flame sensing fault: a. Flame lost during run-the gas control turns off the pilot and main valves and runs blower for 15 seconds (inter-purge).

  • Page 14: Troubleshooting

    Condensing PV Series Observe green LED indicator on electronic gas control. Error flash codes are displayed with a three second pause before repeating. Check and repair the system as noted in the troubleshooting table below. Service Procedure LED Status Control Status Probable Cause None, control No electrical...
  • Page 15 Condensing PV Series Service Procedure LED Status Control Status Probable Cause 1. Unstable pilot. Failed to light 2. Pilot tube blocked or restricted. Six-one flash, pilot. 3. Oxidation build up on pilot electrode. Page 18 three second System auto 4. Wire damage to pilot assembly or bad pause resets.

  • Page 16: Burner Inspection, Cleaning & Replacement

    Condensing PV Series Burner Inspection At periodic intervals (every 6 months) a visual inspection should be made of the pilot and main burner for proper operation and to assure no debris is accumulating. The pilot flame should be stable. Some causes for an unstable pilot flame are: a) The water heater vent is less than the allowable vent length.
  • Page 17 Condensing PV Series Burner Cleaning Step 1. Position the gas control power switch to the “OFF” position and unplug the water heater from wall outlet. Step 2. Turn off the gas supply to the water heater. Step 3. Remove the outer jacket door and inner door per Service Procedure XIII on page 36.

  • Page 18: Pilot Inspection Testing, Cleaning & Replacement

    Condensing PV Series Pilot Inspection, Cleaning & Replacement Step 1. Position the gas control power switch to the “OFF” position and unplug the water heater from wall outlet. Step 2. Turn off the gas supply to the water heater. Step 3. Remove the outer jacket door and inner door per Service Procedure XIII on page 36.

  • Page 19: Pressure Switch Testing & Replacement

    Condensing PV Series Pressure Switch Testing & Replacement WARNING 115 volt potential exposure. Use Step 1. Position the power switch on the gas caution to avoid personal injury. control to the “OFF” position. Step 2. Remove the three screws (Phillips screw driver) from the control access cover on the blower assembly and remove the cover.
  • Page 20 Condensing PV Series Pressure Switch Replacement WARNING 115 volt potential exposure. Use caution to avoid personal injury. Step 1. Position the gas control power switch to the “OFF” position. Step 2. Disconnect the tubing from the pressure switch (see photo 3). Step 3.

  • Page 21: Blower Testing & Replacement

    Condensing PV Series WARNING Blower Testing & Replacement 115 volt potential exposure. Use caution to avoid personal injury. Step 1. Position gas control power switch to the “ON” position and adjust control to call for heat. Step 2. Remove the three screws (Phillip’s screw driver) from control access cover on blower assembly and remove cover (see photo 7).
  • Page 22 Condensing PV Series Blower Removal Step 1. Position the gas control power switch to the “OFF” position and adjust the control to call for heat. Step 2. Unplug the blower power cord from the wall outlet. Step 3. Disconnect the vent system from the exhaust adapter on top of the blower. Step 4.

  • Page 23: Blower Temperature Switch Testing & Replacement

    Condensing PV Series Blower Temperature Switch Testing WARNING Step 1. Position power switch on gas control to the 115 volt potential exposure. Use “OFF” position. caution to avoid personal injury. Step 2. Locate blower temperature switch (see photo 13). Switch Setting Opens on rise @ approximately 155°F Auto resets on fall @ approximately 135°F Cool switch to...
  • Page 24 Condensing PV Series WARNING Blower Temperature Switch 115 volt potential exposure. Use Replacement caution to avoid personal injury. Step 1. Position the gas control power switch to the “OFF” position and unplug the water heater from the wall outlet. Step 2. Locate blower temperature switch (see photo 14). Step 3.

  • Page 25: Gas Control Testing & Replacement

    Condensing PV Series Line Pressure The gas control is designed for a maximum line pressure of 14.0” w.c. and a minimum line pressure of 1.0” w.c. over the water heater’s rated manifold pressure (check rating plate). The line pressure must be checked with the main burner both on AND off to assure proper readings.
  • Page 26 Condensing PV Series ECO (Energy Cut Out) The Honeywell gas control is designed with an ECO device that will reset. If the control has gone into lockout due to excessive tank temperature(four flash, three second pause), reset the control by turning the gas control to the “LOW” position and wait a minimum of (6) seconds.
  • Page 27 Condensing PV Series Gas Control Removal From The Water Heater Step 1. Position the gas control power switch to the “OFF” position and unplug the water heater from the wall outlet. Step 2. Drain the water heater to a point below the gas control level. Step 3.
  • Page 28 Condensing PV Series Reinstallation of Inner Door Assembly c. Prior to reinstallation of inner door, fully inspect for the following: -Tears -Other imperfections that will inhibit proper seal -Missing material -Gasket adhesion to inner door -Cracks -Material left on combustion chamber (around opening) -Dirt or debris If the gasket is not affected by any of the above, the gasket replacement may not be required.

  • Page 29: Simulative Resistive Device Testing

    Condensing PV Series Simulative Resistive Device Testing Step 1. Position the power switch on the gas control to the “OFF” position. Step 2. Disconnect flammable vapor sensor or simulated resistive device from the gas control (model dependant). Step 3. Using a multi-meter set to the ohms setting, check resistance of the flammable vapor sensor or simulated resistive device.

  • Page 30: Safety Circuit Voltage Trace

    Condensing PV Series Safety Circuit Voltage Trace NOTE: This procedure assumes a cool tank. Remove three screws (Phillips Screw driver) from the control access cover on the blower and remove the cover (see photo 17). WARNING 115 volt potential exposure. Use caution to avoid personal injury.

  • Page 31: 115 Vac Circuit Trace

    Condensing PV Series 115 VAC Circuit Trace WARNING Step 1. Verify 115 VAC and proper polarity at wall 115 volt potential exposure. Use outlet. caution to avoid personal injury. Step 2. With unit plugged in and control power switch in the “ON” position verify LED status.

  • Page 32: Diptube Inspection & Replacement

    Condensing PV Series Diptube Inspection & Replacement WARNING Water heater components and stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury. Step 1. Position the on/off switch of the gas control valve to the “OFF” position and unplug the water heater from the wall outlet.

  • Page 33: Anode Inspection & Replacement

    Condensing PV Series Anode Inspection & Replacement This water hater has 2 anodes installed. Both anodes require inspection. WARNING Water Heater components and stored water may be HOT when performing the following steps in this procedure. Take necessary precaution to prevent personal injury.

  • Page 34: Flue Baffle Inspection & Replacement

    Condensing PV Series Flue Baffle Inspection & Replacement Step 1. Position the gas control power switch to Loosen hose clamps the “OFF” position and unplug the with 5/16” nutdriver blower from the wall outlet. Step 2. Use a slotted screwdriver or 5/16” nutdriver to loosen the hose clamps connecting the venting to both the top and back of the blower.
  • Page 35 Condensing PV Series Step 11. Remove the flue baffles and flue core from the water heater. Step 12. Inspect the baffles and flue core for deterioration. Clean any scale or debris build up. Replace with new baffles or flue core as necessary. Step 13.

  • Page 36: Inner Door/Gasket Removal, Inspection & Replacement

    Condensing PV Series Inner Door Removal Procedure Step 1. Position gas control power switch to the “OFF” position. Step 2. Remove outer jacket burner access door. Step 3. Inner Door removal. Remove (2) ¼” hex drive screws from right side inner door. Remove (2) ¼”...
  • Page 37 Condensing PV Series Installation of Inner Door With Gasket WARNING Stripped fastener connections may allow for seal breach of Step 7. Clean any residual gasket residue or other debris from the inner door. A seal breach may combustion chamber surface before installing the inner result in a fire or explosion door/gasket assembly.
  • Page 38 Condensing PV Series Installation of Inner Door With Gasket (cont.) Step 10. Firmly place right side inner door flange against the left side inner door flange and secure with (2) ¼” hex drive screws from step 3b. DO NOT OVER TIGHTEN SCREWS.

  • Page 39: Condensate Trap Removal, Inspection & Replacement

    Condensing PV Series Condensate Trap Removal, Inspection & Replacement The condensate trap has a self-priming trap that safely removes condensate from the water heater. If the condensate is not removed from the water heater, it will accumulate and eventually produce an error code. This condensate trap is field serviceable and can be removed for inspection if this condition exists.

  • Page 40: Exhaust Collector Removal, Inspection & Replacement

    Condensing PV Series Exhaust Collector Removal, Inspection & Replacement The Exhaust Collector Gasket seals around the secondary flue tubes and between the jacket and the collector cover. This seal allows the exhaust to be concentrated into a single exhaust port and allows a passageway for the condensate to flow into the trap. If the condensate is dripping from the seal or if a measured reduction in blower pressure is observed, the gasket may need inspection.
  • Page 41 Condensing PV Series 6. Once all the flange nuts are back in place, reconnect the ¼” clear tubing onto the port on the cover. 7. Connect the condensate tee and coupler to the neck provided on the cover and secure by tightening the hose clamp.
  • Page 42 Condensing PV Series 1. Exhaust Adapter 11. Heat Trap Insert 21. Washer 31. Burner 2. Blower 12. Hot Water Outlet 22. Exhaust Cover 32. Orifice 3. Pressure Switch 13. Inlet Diptube 23. Condensate Tee 33. Pilot 4. Blower Temp. Switch 14.

This manual is also suitable for:

Rc2pv50hnRc2pv50hxLc2pv50h76xRc2pv50h seriesLc2pv50h76 series

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