Paloma PH-28RIFSN Engineering Handbook
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Paloma PH-28RIFSN Engineering Handbook

Paloma PH-28RIFSN Engineering Handbook

Tankless gas water heaters
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R
Tankless Gas Water Heaters
PH-28RIFSN; PH-28CIFSN (Indoor) (NAT. Gas)
PH-28RIFSP; PH-28CIFSP (Indoor) (L.P. Gas)
PH-28ROFN; PH-28COFN (Outdoor) (NAT. Gas)
PH-28ROFP; PH-28COFP (Outdoor) (L.P. Gas)
PH-28RDVSN; PH-28CDVSN (Direct Vent) (NAT. Gas)
PH-28RDVSP; PH-28CDVSP (Direct Vent) (L.P. Gas)
(R: Residentail Model; C: Commercial Model)
Outdoor Water Heater
Direct Vent Water Heater
Indoor Water Heater
CERTIFIED
R
®
Engineering Handbook

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Summary of Contents for Paloma PH-28RIFSN

  • Page 1 Tankless Gas Water Heaters PH-28RIFSN; PH-28CIFSN (Indoor) (NAT. Gas) PH-28RIFSP; PH-28CIFSP (Indoor) (L.P. Gas) PH-28ROFN; PH-28COFN (Outdoor) (NAT. Gas) PH-28ROFP; PH-28COFP (Outdoor) (L.P. Gas) PH-28RDVSN; PH-28CDVSN (Direct Vent) (NAT. Gas) PH-28RDVSP; PH-28CDVSP (Direct Vent) (L.P. Gas) (R: Residentail Model; C: Commercial Model)

  • Page 2: Table Of Contents

    WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death. - Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. To do so may result in an explosion or fire. - WHAT TO DO IF YOU SMELL GAS * Do not try to light any appliance.

  • Page 3: Specifi Cations

    SPECIFICATIONS (Approx.) Model PH-28RIFSN (NAT) PH-28ROFN (NAT) PH-28RDVSN (NAT) PH-28RIFSP (L.P.) PH-28ROFP (L.P.) PH-28RDVSP (L.P.) PH-28CIFSN (NAT) PH-28COFN (NAT) PH-28CDVSN (NAT) PH-28CIFSP (L.P.) PH-28COFP (L.P.) PH-28CDVSP (L.P.) Purpose Domestic Hot Water Supply & Circulating Rated Gas Input 19,000 (Min.) 19,000 (Min.) 19,000 (Min.)

  • Page 4: External Dimensions

    EXTERNAL DIMENSIONS (PH-28RIFS & PH-28CIFS Indoor Model) 14.96” (380mm) Ø4” (101.6mm) 5.12” (130mm) WIRING HOLE 0.39” (10mm) POWER SUPPLY CORD HOLE 6.34” (161mm) 6.34” (161mm) 11.10” (282mm) COLD WATER INLET 3/4"NPT(M) GAS INLET 3/4"NPT(M) (W/Supplied Gas Shutoff Valve) 2.52” 4.17” (106mm) HOT WATER OUTLET (64mm) 3/4"NPT(M)
  • Page 5 EXTERNAL DIMENSIONS (PH-28RDVS & PH-28CDVS Direct Vent Model) 14.96” (380mm) Ø4” (101.6mm) 5.12” (130mm) 5.12” (130mm) 0.39” (10mm) POWER SUPPLY CORD HOLE WIRING HOLE 11.10” (282mm) 6.34” (161mm) 6.34” (161mm) COLD WATER INLFT 3/4"NPT(M) GAS INLWR 3/4"NPT(M) (W/Supplied Gas Shutoff Valve) 2.52”...

  • Page 6: Schematic Construction

    SCHEMATIC CONSTRUCTION (PH-28RIFS & PH-28CIFS Indoor Model) Gas Connection 3/4” NPT (F) Water Inlet Connection (W/Supplied Gas Shutoff Valve) Hot Water Outlet 3/4” NPT (M) Connection 3/4” NPT (M) Name of Parts Name of Parts Name of Parts Front Cover 11 Sensing Burner Assembly Water Inlet Connection Back Cover...
  • Page 7 SCHEMATIC CONSTRUCTION (PH-28ROF & PH-28COF Outdoor Model) Gas Connection 3/4” NPT (F) (W/Supplied Gas Shutoff Valve) Water Inlet Connection Hot Water Outlet 3/4” NPT (M) Connection 3/4” NPT (M) Name of Parts Name of Parts Name of Parts Front Cover 11 Orifi...
  • Page 8 SCHEMATIC CONSTRUCTION (PH-28RDVS & PH-28CDVS Direct Vent Model) 21 22 Name of Parts Name of Parts Name of Parts Front Cover 11 Orifi ce Stand L Assembly 21 Hot Water Outlet Connection Back Cover 12 Orifi ce Stand R Assembly Drain Valve Air Intake 13 Flame Rod...

  • Page 9: Operational Principle

    OPERATIONAL PRINCIPLE Inlet Hot Water Outlet Water Inlet Name of Parts Name of Parts Name of Parts Hot Water Tap 11 Solenoid Valve 2 Exhaust Outlet Bypass Solenoid Valve 12 Solenoid Valve 3 22 Combustion Chamber Water Flow Sensor Proportional Gas Control Valve 23 Freeze Protection Heater Water Inlet Thermistor 14 Orifi...
  • Page 10 OPERATIONAL PRINCIPLE WHEN SUPPLYING HOT WATER 1) By opening the Hot Water Top (1), the water fl ows through the Water Flow Sensor (3) to the Heat Heat Exchanger (19). 2) The frequency signal is given from the Water Flow Sensor (3) and when the PC Board (27) senses the signal that reached a certain frequency, the Fan (24) starts to turn round.
  • Page 11 Oxygen Depletion Safety Device (O.D.S.D.) [Sensing Burner] (Indoor Model & Direct Model Only) The sensing burner is a all primary air type ceramic burner that consists of an outer jacket surrounding the flame opening and a thermocouple to detect flame temperature. In case oxygen level decreases due to blocked or clogged air intake or flue venting, or by contaminated air, location of the flame will change as well as its temperature by the thermocouple.
  • Page 12 If Imperfect Combustion Happens..(Indoor Model & Direct Model Only) Sensor Stand-By Water Flow Lead Time Servo OFF Normal Air Extinction Ignition Flow Rate Post- Purging Cold: 2 Min. Hot: 30 Sec. - 1 Min. Decrease of Thermo Electric Current Input Down Automatic Control To Resolve (Increase Air...

  • Page 13: Capacity

    Capacity Hot Water Capacity Curve: Residential Models Inlet Water Temperature : 40°F Inlet Water Temperature : 50°F 0.66 0.66 When maximum temperature is set at 140°F When maximum temperature is set at 140°F When maximum temperature is set at 120°F When maximum temperature is set at 120°F 10.0 11.0...
  • Page 14 Capacity Hot Water Capacity Curve: Commercial Models Inlet Water Temperature : 40°F Inlet Water Temperature : 50°F 0.66 0.66 When maximum temperature is set at 180°F When maximum temperature is set at 180°F When maximum temperature is set at 120°F When maximum temperature is set at 120°F 10.0 11.0...

  • Page 15: Wiring Diagram

    Wiring Diagram A wiring diagram is also located on the inside of the front cover panel. Slightly different by model and serial number. - 15 -...

  • Page 16: Operational Flow Chart & Maintenance Information

    Operational Flow Chart & Maintenance Information - 16 -...

  • Page 17: Diagnostic Points

    Diagnostic Points The voltage showed is the value of operating condition when the water heater operates according to the flow chart. The resistance showed is the value of load side when turned off the electric power and disconnected the connector. - 17 -...
  • Page 18 - 18 -...
  • Page 19 MAINTENANCE INFORMATION SHOWN IN LED DISPLAY OF REMOTE CONTROL ABOVE - 19 -...

  • Page 20: Error Codes

    Error Codes Code Fault Remedy Imperfect Combustion Alarm Clean air inlet fi lter. Clean combustion air fan. Clean heat exchanger fi ns. Check for adequate combustion air ventilation openings and clean if neces- sary. Check vent system for partial blockage and correct as necessary. Decrease of Fan Motor Ventilation Check all vent components for proper connections.
  • Page 21 Code Fault Remedy Boiling Safety Device Check for closed water heater inlet valve or restriction in cold water inlet pipe (must be fully open). Check for clogged heat exchanger (scale buildup). On commercial water heater, lower set point temperature below 180F at high altitude.
  • Page 22 Code Fault Remedy Malfunction of Water Volume Con- Check water fl ow solenoid valve wiring harness for loose or damage trol Motor terminals. Check for proper voltage to water fl ow solenoid. Gas Inlet Solenoid Valve Control Check gas inlet solenoid valve wiring harness for loose or damage termi- Fault nals.
  • Page 23 Hints For Diagnosis * Always inspect water heater by referring to the previous chapter "Operation System & Diagnostic Points" and/or the Operational Flow Chart. * When measuring resistance of a part, turn off the electric power and make sure to disconnect the part completely before measuring (from connector or terminal).
  • Page 24 B. Error code is displayed when the Power Button on remote control turns on. 1. Error Code [82] (Gas Type Control Data Failure) is displayed. WARNING: When replacing High Altitude Connector, always turn off the electric power to water heater. Pull out the power cord or turn off the electric ON/OFF Switch.
  • Page 25 C. The Fan Motor does not activate even when the Hot Water Tap is opened. 1. No Error Code. Display maintenance information [1y] with water NOTE: [1y] shows the GPM (water flow rate) detected by flow of more than 1.0 gal/min. Water Flow Sensor.
  • Page 26 4. Error Code [61] (Fan Failure ) is displayed. *4 Check that the fan turns round with eyes (visually). Check that there are some air volume from outlet terminal or flue outlet. Does the Fan Motor Does have Replace Burner Control Assy. the Fan operate? sufficient voltage? *5 Measure the voltage of connector...
  • Page 27 2. Error Code [32] (Heat Exchanger Thermistor Disconnection) is displayed. [4y] indicates the temperature detected by the heat exchanger thermistor. Display maintenance information [4y]. Is the Does resistance of the [4y] indicate the hot Replace Heat Exchanger heat exchanger water outlet Thermistor.
  • Page 28 5. Error Code [61] (Fan Failure) is displayed. Refer to the previous C-4 (Error Code [61]). 6. Error Code [21] (Malfunction of Air Intake Filter Switch) is displayed. (Indoor Model Only) NOTE: When performing and/or servicing the water heater without front cover (opened), operate it by pushing the air filter switch (ON).

  • Page 29: Ignition Failure

    7. Error Code [72] (Detected False Flame) is displayed. NOTE: Make sure whether there is any remaining flame or not. (Visually) Display maintenance information [0y]. If yes, replace Gas Control Assembly. [0y] indicates the flame signal (flame detection). Flame Rod Status [0y] INFORMATION 00 Does the [0y] Flame Rod 1...
  • Page 30 F. Does not ignite the Main Burner and indicates Error Code [11] even when the Igniter sparks. (Ignition Failure) Does the Gas Inlet Solenoid Valve Replace Burner Control Assy. have a voltage? *1 Measure the voltage of connector Between Black and Yellow wires: 75 ~ 100 VDC Does the Solenoid Valve 1...
  • Page 31 G. Main Burner shuts off after ignition. (In Use Indicator on remote control does not turn on) Error Code [11] is displayed. (Ignition Failure) Display maintenance information [0y]. Try to ignite the Main Burner. Does the [0y] Is there Clean or replace Main Burner indicate [01] ~ [07] any flame current? and Flame Rod Electrode.
  • Page 32 3. Error Code [13] (Oxygen Depletion Safety Device Working) is displayed. (Indoor & Direct Vent Model Only) Is the Is the electromotive force burner manifold Adjust the burner manifold of the thermocouple OK? pressure normal? pressure. Check the followings. * Dirt or blockade of the Heat Exchanger or Venting.
  • Page 33 5. Error Code [12] (Flame Failure) is displayed. Is the Check the inlet supply gas burner manifold pressure and adjust the burner pressure normal? manifold pressure. *4 Measure the burner manifold pressure. (Refer to Pages 35 ~ 37 for adjustment of manifold pressure.) PH-28 Indoor MAX.
  • Page 34 Pull out the relay connection of flame rod connectors and then display maintenance information [0y]. Does the [0y] Clean or replace Main Burner indicate [01] ~ [07] and Flame Rod Electrode. (remaining flame)? Replace Burner Control Assy. J. Error Code [65] (Malfunction of Water Volume Control Motor) is displayed. Turn the power off and then, turn it on.

  • Page 35: Adjustment

    ADJUSTMENT Adjustment of Burner Control Assembly (PC Board): The content on this page is intended for use by qualified service personnel only. WARNING: Improper adjustment, alteration, service or maintenance can cause property damage, personal injury, or death. When replaced the Burner Control Assembly, adjust as follows. WARNING: Without the adjustment, the water heater may not function properly.
  • Page 36 [Adjustment of "Minimum" Capacity] (1) Open the hot water tap gradually until the water heater ignites at the minimum operating water flow. (2) Push the Adjusting Button on the PC Board. ([LH] is displayed on the LED of remote control.) (3) Continue to pushing the Adjusting Button, push the “Min.”...
  • Page 37 Note: If the [EE] is displayed on the LED of remote control, adjust the Check the table below for above again with caution in the (6). the PCB and model. PCB Item No. Model No. [How To Check Test Point Gas Pressure] 31-51531 PH-28RIFS When push the “Max.”...
  • Page 38 For High Altitude Installation Above 3,280 Feet (1,000 M): WARNING: Improper adjustment, alteration, service or maintenance can cause property damage, personal injury, or death. NOTICE: A different High Altitude Chip is required for every 3,280 High Altitude DIP Switch Adjustment feet (1,000 m).
  • Page 39 (12) Change the Dip Switch #1 and #2 setting to the “OFF” position. DO NOT alter any other DIP Switch. (The LED on the PCB and the display of the remote control stops illuminating.) (13) Attach the unit’s front cover. (14) Turn on the gas shutoff valve and water shutoff valve.
  • Page 40 For Sea Level Installation 0 ~ 3,280 Feet (0 ~ 1,000 M): WARNING: Improper adjustment, alteration, service or maintenance can cause property damage, personal injury, or death. Sea Level DIP Switch Adjustment NOTICE: A different Sea Level Chip is required for Indoor, Outdoor and The original PC Board on the water heater from a factory is Direct Vent models, type of gas set at the sea level operation (0 ~ 3,280 feet) (0 ~ 1,000 m),...
  • Page 41 (12) Change the Dip Switch #1 and #2 setting to the “OFF” position. DO NOT alter any other DIP Switch. (The LED on the PCB and the display of the remote control stops illuminating.) (13) Attach the unit’s front cover. (14) Turn on the gas shutoff valve and water shutoff valve.
  • Page 42 Instruction for replacing Upper Burner Assembly: WARNING: Improper adjustment, alteration, service or maintenance can cause property damage, personal injury, or death. Adjustment for Upper Burner Assembly.: WARNING: Without the adjustment, the water heater may not function properly. WARNING: After replacing the front plate, check for gas leakage. Then, test ignition. Make sure that there is no gas leakage.
  • Page 43 (6) Pivot Burner Pipes A, B, C so that they are not in front of the Front Plate. Igniter Assy. (7) Remove fourteen (14) FT screws that hold FT Screw FT Screw FT Screw the Front Plate in place. Burner Pipe A 5.
  • Page 44 - 44 -...
  • Page 45 Instruction for changing the setting to 140°F (60°C) for Residential Models: WARNING: Improper adjustment, alternation, service or maintenance can cause property damage, personal injury, or death. Temperature Setting DIP Switch Adjustment Required adjustment for up to 140°F (60°C) water temperature settings - Can be achieved only when using MAIN remote control.
  • Page 46 Instruction for changing the setting to 180°F (82°C) for Commercial Models: WARNING: Improper adjustment, alternation, service or maintenance can cause property damage, personal injury, or death. Temperature Setting DIP Switch Adjustment Required adjustment for up to 180°F (82°C) water temperature settings - Can be achieved only when using MAIN remote control.
  • Page 47 Instruction for changing the setting back to 120°F (49°C): WARNING: Improper adjustment, alternation, service or maintenance can cause property damage, personal injury, or death. Temperature Setting DIP Switch Adjustment Required adjustment to LIMIT maximum water temperature setting to 120°F (49°C) - Follow the instruction below if it is determined that a setting of up to 140°F (60°C) or 180ºF (82ºC) is no longer required.

  • Page 48: How To Disassemble Each Parts

    HOW TO DISASSEMBLE EACH PARTS (1) When performing maintenance and/or servicing the water heater, before disassembling, always turn off the electric power, gas shutoff valve and water shutoff valve. Wait for the water heater to become cool. Be careful to avoid injury to your fingers. (2) Drain all water from the water heater when disassemble the water parts.
  • Page 49 Process Illustration [2] How To Remove Main Burner: Continue from the previous page. (2) Main Burner Assy. (#112, 113,114) Removal: 1. Pull out three (3) wires for electrode Refer to the electrode (#132,133) in the (#132,133) in front side. Schematic Disassembly. 2.
  • Page 50 Process Illustration [4] How To Remove Water Control By-Pass Pipe Quick Fastener Assembly (#410): (1) Burner Control Assy. (#723) Removal: Water Supply Remove burner control assy. (#723) by Pipe referring to [1] - 1, 2 & 3. Water Inlet Pipe Flange (2) Water Inlet Pipe Assy.
  • Page 51 Process Illustration [6] How To Remove Transformer Assy. (#724): (1) Burner Control Assembly (#723) Removal: Remove burner control assy. (#723) by Transformer referring to [1] - 1, 2 & 3. Assy. (2) Water Control Assembly (#410) Removal: Remove water control assy. (#410) by referring to [4] - (2) 1, 2 &...
  • Page 52 Process Illustration [9] How To Remove Heat Exchanger (#415): (1) Burner Control Assy. (#723) Removal: Remove burner control assy. (#723) by referring to [1] - 1, 2 & 3. (2) Burner Pipe A (#138), Burner Pipe B (#141) Heat Exchanger and Burner Pipe C (#140) Removal: Remove burner pipe A, burner pipe B and burner pipe C by referring to [2] - (1) 2.
  • Page 53 Schematic Disassembly (PH-28RIFS) - 53 -...
  • Page 54 Schematic Disassembly (PH-28ROF) - 54 -...
  • Page 55 Schematic Disassembly (PH-28RIFS & PH-28ROF) - 55 -...
  • Page 56 Parts List for PH-28RIFS Name of Parts Name of Parts Name of Parts Front Cover Assembly Plug for Manifold Pressure Flange Back Cover Assembly Slide Bracket A Hot Water Outlet Thermistor Support Plate Heat Exchanger Thermistor Quick Fastener Air Filter Assembly “O”...
  • Page 57 Parts List for PH-28ROF Name of Parts Name of Parts Name of Parts Front Cover Assembly Plug for Manifold Pressure Flange Back Cover Assembly Slide Bracket A Hot Water Outlet Thermistor Support Plate Heat Exchanger Thermistor Quick Fastener “O” Ring P-12.7 Flue Outlet Flange “O”...
  • Page 58 Schematic Disassembly (PH-28CIFS) - 58 -...
  • Page 59 Schematic Disassembly (PH-28COF) - 59 -...
  • Page 60 Schematic Disassembly (PH-28CIFS & PH-28COF) - 60 -...
  • Page 61 Parts List for PH-28CIFS Name of Parts Name of Parts Name of Parts Front Cover Assembly Plug for Manifold Pressure Flange Back Cover Assembly Slide Bracket A Hot Water Outlet Thermistor Support Plate Heat Exchanger Thermistor Air Filter Assembly Quick Fastener “O”...
  • Page 62 Parts List for PH-28COF Name of Parts Name of Parts Name of Parts Front Cover Assembly Plug for Manifold Pressure Flange Back Cover Assembly Slide Bracket A Hot Water Outlet Thermistor Heat Exchanger Thermistor Support Plate Quick Fastener “O” Ring P-12.7 Flue Outlet Flange “O”...
  • Page 63 Schematic Disassembly (PH-28RDVS) - 63 -...
  • Page 64 Schematic Disassembly (PH-28CDVS) - 64 -...
  • Page 65 Schematic Disassembly (PH-28RDVS & PH-28CDVS) - 65 -...
  • Page 66 Parts List for PH-28RDVS Name of Parts Name of Parts Name of Parts Front Cover Assembly Plug for Manifold Pressure Flange Back Cover Assembly Slide Bracket A Hot Water Outlet Thermistor Support Plate Heat Exchanger Thermistor Burner Rod Assembly Quick Fastener “O”...
  • Page 67 Parts List for PH-28CDVS Name of Parts Name of Parts Name of Parts Front Cover Assembly Plug for Manifold Pressure Flange Back Cover Assembly Slide Bracket A Hot Water Outlet Thermistor Support Plate Heat Exchanger Thermistor Quick Fastener Burner Rod Assembly “O”...
  • Page 68 Paloma Industries, Inc. 2151 Eastman Avenue Oxnard, CA 93030 Phone: (805) 278-5499 or (805) 278-5480 Fax: (805) 278-5468 Printed in USA 2008-09...

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