Lochinvar Power-fin 502 Service Manual
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Lochinvar Power-fin 502 Service Manual

Lochinvar Power-fin 502 Service Manual

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See also: User Manual , Operation & Installation Manual
Service Manual
Models:
502, 752, 1002, 1302,
1501, 1701, and 2001
Up To 5:1 Turndown
This manual must only be used
WARNING
by a qualified heating installer /
service technician. Read all
instructions,
including
this
manual
and
the
Power-fin
Installation
and
Operation
Manual,
before
installing.
Perform steps in the order given.
Failure to comply could result in
severe personal injury, death, or
substantial property damage.
Save this manual for future reference.

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Summary of Contents for Lochinvar Power-fin 502

  • Page 1 Service Manual Models: 502, 752, 1002, 1302, 1501, 1701, and 2001 Up To 5:1 Turndown This manual must only be used WARNING by a qualified heating installer / service technician. Read all instructions, including this manual Power-fin Installation Operation Manual, before installing.

  • Page 2: Table Of Contents

    Service Manual Contents Contents ............2 Hazard definitions .

  • Page 3: Please Read Before Proceeding

    Service Manual Please read before proceeding Installer – Read all instructions, When servicing appliance – WARNING including this manual and the Power-fin • To avoid electric shock, disconnect electrical supply Installation and Operation Manual, before performing maintenance. before installing. Perform steps in the order given.

  • Page 4: What Is In This Manual

    Service Manual What is in this manual? Maintenance Service • Service and maintenance schedules The Power-fin display • Address reported problems • Display panel readout, buttons and their functions • Inspect appliance area and appliance interior • Clean condensate trap Control module inputs •...

  • Page 5: Service

    Service Manual Service The Power-fin display...
  • Page 6 Service Manual Service Control inputs...
  • Page 7 Service Manual Service (continued) Control outputs...

  • Page 8: General Operation

    Service Manual Service General Operation How the appliance operates Access modes User The Power-fin uses a copper-finned tube heat exchanger to transfer heat from the flue products to the water. An electronic The user can adjust space heating set point using the UP and control module monitors various inputs to initiate a call for DOWN buttons at any time during normal operation.

  • Page 9: Sequence Of Operation

    Service Manual Service (continued) Sequence of operation Table 1A_Sequence of Operation - Space Heating and DHW O O P P E E R R A A T T I I O O N N D D I I S S P P L L A A Y Y HTR: Standby 1.
  • Page 10 Service Manual Service Sequence of operation Table 1A_(continued from previous page) Sequence of Operation - Space Heating and DHW O O P P E E R R A A T T I I O O N N D D I I S S P P L L A A Y Y 9.
  • Page 11 Service Manual Service (continued) Display panel menu access Table 1B_Use this procedure to access menus from the display panel Note: Not all menu listings shown above are available on water heaters.

  • Page 12: Display Panel Parameter Access

    Service Manual Service Display panel parameter access Table 1C_This is a typical example of accessing a parameter, shown for parameter K2, SH pump delay Cascade...

  • Page 13: Parameter Table

    Service Manual Service (continued) Parameter table Table 1D_This table lists SMART SYSTEM control module parameters and where to access them U U S S E E R R A A C C C C E E S S S S I I N N S S T T A A L L L L E E R R A A C C C C E E S S S S S S E E E E M M E E N N U U...
  • Page 14 Service Manual Service Parameter table (continued) Table 1D_(continued from previous page) This table lists SMART SYSTEM control module parameters and where to access them U U S S E E R R A A C C C C E E S S S S I I N N S S T T A A L L L L E E R R A A C C C C E E S S S S S S E E E E M M E E N N U U...

  • Page 15: Viewable And Changeable Control Parameters

    Heater model week (Monday through Sunday) will have an on and off time. The control will display “LOCHINVAR” as the model number Example: Monday ON: 22:30, Tuesday OFF: 6:45. If you wish because the same control is used on several models. This will be to skip a day and have no night setback, leave the on and off displayed when parameter A1 has been accessed.
  • Page 16 Service Manual Service E: DHW settings C: Data logging Hours running SH DHW tank set point The hours running SH parameter shows the total number of When a temperature sensor is installed in the DHW tank, the hours the unit has been in the SH firing position. This DHW tank set point sets the target temperature of the water in parameter can be viewed by the user and the installer by...
  • Page 17 Service Manual Service (continued) Figure 1-1_Outdoor Air Reset Curve Maximum SH set point Outdoor air shutdown differential When the outdoor temperature drops to its minimum The outdoor air shutdown differential parameter is the number setting (F1) the water temperature will be at this point, if of degrees below parameter F5 the outdoor air temperature must the SH set point is set higher (FIG.
  • Page 18 Service Manual Service Ramp delay on/off (M9 boilers only) Boost temperature When the ramp delay on/off parameter is active, the ramp delay If a SH demand lasts longer than the programmed time delay setting (F9) and there have been no DHW demands, the control limits the boiler firing rate when a SH cycle has started.
  • Page 19 Service Manual Service (continued) Figure 1-2_Ramp Delay Interval H: Control modes 0-10V building management input (BMS) SH controlling sensor (boiler only) When the building management input is enabled, the control modulates the unit (B9 or M9 only) or the cascade based on the The SH controlling sensor parameter selects the sensor the voltage on the 0-10V input on the connection board.
  • Page 20 Service Manual Service Max. cascade set point Voltage at maximum This setting determines the voltage at which the external signal This parameter determines the set point used by the individual forces either the modulation or the set point to their maximum boilers in a Cascade.
  • Page 21 Service Manual Service (continued) Maximum set point L: Service Notification This setting determines the set point used by the unit or cascade Service notification in months when the BMS voltage is at or above the Voltage at Maximum setting. This parameter is only active when the BMS type is set When the boiler control determines that a scheduled service is to Set Point.

  • Page 22: Maintenance

    Service Manual Maintenance Maintenance and annual startup Table 2A_Service and Maintenance Schedules Owner maintenance Service technician (see the Power-fin User’s Information Manual for (see the following pages for instructions) instructions) General: • Check appliance area • Address reported problems • Check pressure/temperature gauge •...

  • Page 23: Address Reported Problems

    Service Manual Maintenance (continued) Follow the service and maintenance procedures given throughout this manual and in component literature WARNING shipped with the appliance. Failure to perform the service and maintenance could result in damage to the appliance or system. Failure to follow the directions in this manual and component literature could result in severe personal injury, death, or substantial property damage.

  • Page 24: Flue Vent System And Air Piping

    Service Manual Maintenance Safety relief valves should be re-inspected Flue vent system and air piping WARNING AT LEAST ONCE EVERY THREE YEARS, 1. Check for gastight seal at every connection, seam of air by a licensed plumbing contractor or piping, and vent piping periodically inspected by a qualified authorized inspection agency, to ensure that service agency.

  • Page 25: Check Burner Flame

    Service Manual Maintenance (continued) Perform start-up and checks Inspect/replace hot surface igniter 1. Start appliance and perform checks and tests specified in 1. Turn off main electrical power to the appliance. Section 7 - Start-up of the Power-fin Installation and Operation Manual.
  • Page 26 Service Manual Maintenance Access to the burner will require the following steps: Check flue gas passageways Turn off main electrical power to the appliance. Any sign of soot around the inner jacket, outer jacket, flue pipe connections, burner or in the areas between the fins on the Turn off main manual gas shutoff to the appliance.
  • Page 27 5) until HTR:Standby appears in the display Water Column Water Column Model No. window. (w.c.) (w.c.) F9: 502 - 1302 +3.2 +10.0 Locate the pinhole button below the ENTER/RESET button (see page 5). Press the button once and hold for B9: 1501 -4.5 to -5.4 -3.2 to 3.8...

  • Page 28: Combustion Analysis Procedure

    You must replace the flue temperature sensor Model No. WARNING to prevent flue gas spillage into the room. F9: 502 - 1302 7.9 to 8.4 9.0 to 9.5 Failure to comply could result in severe personal injury, death, or substantial B9: 1501 - 2001 8.0 to 8.5...
  • Page 29 Service Manual Maintenance Maintenance (continued) Gas valve adjustment procedure Figure 2-5_Throttle Adjustment Screw - F9 Model Turn the appliance power switch to the “OFF” position. Loosen the thumbscrew on the upper left access panel. Remove the upper left access panel. Remove the screws along the front and rear edge of the top outer jacket panel.

  • Page 30: Review With Owner

    Service Manual Maintenance Inspect and clean the heat exchanger Turn off all power to the appliance. Turn off main gas to appliance. Remove the front outer jacket panel. Remove the inner jacket panel (see FIG. 2-7). Check the heat exchanger surface for soot. If soot is present, the heat exchanger must be cleaned and the problem corrected.

  • Page 31: Troubleshooting

    Service Manual Troubleshooting Check control module fuses Label all wires prior to disconnection when WARNING servicing controls. Wiring errors can cause ALWAYS check control module fuses before improper and dangerous operation. Always NOTICE replacing control module or any major disconnect power to the appliance before components (blower, etc.).

  • Page 32: Troubleshooting Chart - No Display

    Service Manual Troubleshooting Table 3A Troubleshooting Chart - No Display F F A A U U L L T T C C A A U U S S E E C C O O R R R R E E C C T T I I V V E E A A C C T T I I O O N N •...

  • Page 33: Checking Temperature Sensors

    Service Manual Troubleshooting (continued) Checking temperature sensors The appliance temperature sensors (inlet water, outlet water, system water, tank water, flue, and outdoor air) are all resistance type devices. The following tables show the correct values for the sensors at various temperatures. Use an ohmmeter to read the resistance of the sensor at a known temperature.

  • Page 34: Troubleshooting Chart - Noisy System

    Service Manual Troubleshooting Table 3E Troubleshooting Chart - Noisy System F F A A U U L L T T C C A A U U S S E E C C O O R R R R E E C C T T I I V V E E A A C C T T I I O O N N - Gas supply problem.

  • Page 35: Troubleshooting Chart - Fault Messages

    Service Manual Troubleshooting (continued) Table 3F Troubleshooting Chart - Fault Messages Displayed on Operator Interface F F A A U U L L T T D D E E S S C C R R I I P P T T I I O O N N C C O O R R R R E E C C T T I I V V E E A A C C T T I I O O N N Either the optional manual reset low gas •...
  • Page 36 Service Manual Troubleshooting Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface F F A A U U L L T T D D E E S S C C R R I I P P T T I I O O N N C C O O R R R R E E C C T T I I V V E E A A C C T T I I O O N N The unit has failed to prove main burner •...
  • Page 37 Service Manual Troubleshooting (continued) Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface F F A A U U L L T T D D E E S S C C R R I I P P T T I I O O N N C C O O R R R R E E C C T T I I V V E E A A C C T T I I O O N N The unit was running and lost the flame signal.
  • Page 38 Service Manual Troubleshooting Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface F F A A U U L L T T D D E E S S C C R R I I P P T T I I O O N N C C O O R R R R E E C C T T I I V V E E A A C C T T I I O O N N The outlet water temperature has exceeded •...
  • Page 39 Service Manual Troubleshooting (continued) Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface F F A A U U L L T T D D E E S S C C R R I I P P T T I I O O N N C C O O R R R R E E C C T T I I V V E E A A C C T T I I O O N N The actual fan RPM is 30% higher than what •...
  • Page 40 Service Manual Troubleshooting Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface F F A A U U L L T T D D E E S S C C R R I I P P T T I I O O N N C C O O R R R R E E C C T T I I V V E E A A C C T T I I O O N N APS Open The air pressure switch did not make within...
  • Page 41 Service Manual Troubleshooting (continued) Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface F F A A U U L L T T D D E E S S C C R R I I P P T T I I O O N N C C O O R R R R E E C C T T I I V V E E A A C C T T I I O O N N The temperature rise across the heat •...
  • Page 42 Service Manual Troubleshooting Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Operator Interface F F A A U U L L T T D D E E S S C C R R I I P P T T I I O O N N C C O O R R R R E E C C T T I I V V E E A A C C T T I I O O N N While the unit is in Service Mode, the outlet •...
  • Page 43 NOTES...

  • Page 44: Revision Notes

    Revision Notes: Revision B (PBX-PFX-SER- Rev B) reflects the addition of Models 502 - 1302 to the manual. Revision C (PBX-PFX-SER-Rev C) reflects the addition of parameter ranges. PBX-PFX-SER-Rev C CP-2M-10/07...

This manual is also suitable for:

Power-fin 752Power-fin 1002Power-fin 1302Power-fin 1501Power-fin 17012001 ... Show all

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