HTP EFTC-140W Installation & Startup
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HTP EFTC-140W Installation & Startup

Elite fire tube combi
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NOTICE: HTP reserves the right to make product changes or updates without notice and will not be held liable for typographical errors
in literature.
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
The surfaces of these products contacted by consumable water contain less than 0.25% lead by weight, as required by the Safe
Drinking Water Act, Section 1417.
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.
•
Do not try to light any appliance.
•
Do not touch any electrical switch; do not use any phone in your building.
•
Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
•
If you cannot reach your gas supplier, call the fire department.
•
Installation and service must be provided by a qualified installer, service agency or the gas supplier.
Improper installation, adjustment, alteration, service, or maintenance can cause injury, property damage, or death. Refer to
this manual. Installation and service must be performed by a qualified installer, service agency, or gas supplier.
California Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer, birth defects, or
other reproductive harm.
272 Duchaine Blvd.
Elite Fire Tube Combi
WHAT TO DO IF YOU SMELL GAS
New Bedford, MA 02745
INSTALLATION / START-UP
MAINTENANCE / PARTS
EFTC-140W / 199W
Heat Exchanger Bears the ASME "H" Stamp
Wall Mount
WARRANTY
Models
www.htproducts.com
LP-520 REV. 5.1.17

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  • Page 1 EFTC-140W / 199W Heat Exchanger Bears the ASME “H” Stamp NOTICE: HTP reserves the right to make product changes or updates without notice and will not be held liable for typographical errors in literature. NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
  • Page 2 LP-520 REV. 5.1.17...
  • Page 3 The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels, or to important product information. DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

  • Page 4: Table Of Contents

    In some circumstances, the property owner or his/her agent assumes the role, and at government installations, the commanding officer or departmental official may be the AHJ. NOTE: HTP, Inc. reserves the right to modify product technical specifications and components without prior notice. FOR THE INSTALLER This manual must only be used by a qualified heating installer/service technician.
  • Page 5 E. WATER CHEMISTRY ................................10 F. FREEZE PROTECTION ................................10 G. SCALDING ....................................10 H. HIGH ELEVATION INSTALLATIONS............................11 PART 3 – TECHNICAL SPECIFICATIONS ..........................11 PART 4 – PREPARE APPLIANCE LOCATION ........................14 A. UNCRATING THE APPLIANCE ............................... 14 B.
  • Page 6 B. WIRING INFORMATION ................................43 C. DIP SWITCHES ..................................43 PART 10 – OPERATING SYSTEM INSTRUCTIONS ........................ 49 A. CONTROL PANEL ................................... 49 B. LCD DISPLAY DESCRIPTIONS .............................. 50 C. START-UP SEQUENCE ................................50 D. CHANGING THE DHW SET-POINT ............................51 E.

  • Page 7: Part 1 - Items Shipped With The Appliance

    PART 1 – ITEMS SHIPPED WITH THE APPLIANCE ITEM DESCRIPTION QUANTITY Elite Fire Tube Combi Appliance 140W / 199W Installation and User’s Information Manuals, H2 1 Each Document Condensate Hose (7855P-089) CH Pressure Relief Valve With ¾” X 1” Bushing 1 Each.

  • Page 8: Part 2 - Safety Regulations

    HTP, Inc. cannot anticipate every circumstance that might involve a potential hazard. Each installation has its own specialized characteristics, requirements, and possible hazards. Therefore, all possible incidents are not included in these warnings. Proper and safe installation, operation, and service are the responsibility of the professional service technician.

  • Page 9: Improper Combustion

    Due to the low water content of the appliance, improper sizing of the appliance with regard to heating system load will result in excessive cycling and accelerated component failure. HTP DOES NOT warrant failures caused by improperly sized appliance applications. DO NOT oversize the appliance to the system. Modular appliance installations greatly reduce the likelihood of appliance oversizing.

  • Page 10: Water Chemistry

    F. FREEZE PROTECTION Consider appliance piping and installation when determining appliance location. NOTE: Damages resulting from incorrect installation or from use of products not approved by HTP, Inc. ARE NOT covered by warranty. G. SCALDING APPROXIMATE TIME / TEMPERATURE RELATIONSHIPS IN SCALDS More than 5 minutes 1 ½...

  • Page 11: High Elevation Installations

    3.5 Gallons Heat Exchanger Capacity 4 Gallons Total Water Capacity 5 Gallons Main Controller / Control Panel NGTX-900C / P-920C_CB-HTP CH Pressure Min 12 PSI - Max 30 PSI DHW Pressure Max 150 PSI DHW Inlet / Hot ¾” NPT...
  • Page 12 Figure 1 – 140W Specifications and Dimensions DESCRIPTION DIAMETER (ALL NPTM) Automatic Air Vent 3” Intake Pipe Connection 3” Exhaust Vent Connection ¾” NPT Relief Valve Adapter 1” NPT CH Supply Adapter 1” NPT CH Return Adapter ¾” NPT DHW Outlet Adapter ¾”...
  • Page 13 Figure 2 - 199W Specifications and Dimensions DESCRIPTION DIAMETER (ALL NPTM) Automatic Air Vent 3” Intake Pipe Connection 3” Exhaust Vent Connection ¾” NPT Relief Valve Adapter 1” NPT CH Supply Adapter 1” NPT CH Return Adapter ¾” NPT DHW Outlet Adapter ¾”...

  • Page 14: Part 4 - Prepare Appliance Location

    Figure 3 – Model Components NUMBER COMPONENT DESCRIPTION NUMBER COMPONENT DESCRIPTION Air Vent Condensate Adapter Air Intake Adapter Condensate Trap Air / Gas Mixing Pipe Condensate Air Pressure Switch Gas Valve Mixing Valve Internal Storage Tank Terminal Block Main PCB Control Panel Manual ON/OFF Power Switch Heat Exchanger...

  • Page 15: Before Locating The Appliance

    The appliance should be located near a floor drain, or installed in an adequately drained drain pan. HTP WILL NOT be held liable for leakage damages. To conserve water and energy, insulate all water piping, especially the hot and recirculation water lines.

  • Page 16: Leveling

    • Location that could cause the system and appliance to freeze and leak. • Incorrectly-sized expansion tank Do not connect the appliance to any heating systems or components that have been previously used for non-potable applications. Do not introduce toxic chemicals, such as antifreeze or appliance treatments, into the appliance or any piping meant for potable water purposes.

  • Page 17: Residential Garage And Closet Installations

    E. RESIDENTIAL GARAGE AND CLOSET INSTALLATIONS Check with your local Authority Having Jurisdiction for requirements when installing appliance in a garage or closet. Please read the entire manual before attempting installation. Failure to properly take factors such as venting, piping, condensate removal, and wiring into account before installation could result in wasted time, money, and possible property damage and personal injury.

  • Page 18: Prevent Combustion Air Contamination

    H. PREVENT COMBUSTION AIR CONTAMINATION Install intake piping for the appliance as described in the Venting section. Do not terminate exhaust in locations that can allow contamination of intake air. Ensure that the intake air will not contain any of the contaminants below. For example, do not pipe intake near a swimming pool. Avoid areas subject to exhaust fumes from laundry facilities.

  • Page 19: Wall-Mounting The Appliance

    6. After it has been determined that each appliance remaining connected to common venting system properly vents when tested as outlined, return doors, windows, exhaust fans, fireplace dampers and any other gas burning appliance to their previous condition of use. 7.
  • Page 20 1. Locate the DHW inlet adapter on the bottom of the appliance. 2. Pull the two pins to release the DHW inlet filter. See Figure 7-A. The flow restrictor is attached to the top of the filter assembly. 3. Remove the installed white flow restrictor and replace it with the blue flow restrictor included with the appliance. See Figure 7-B. 4.

  • Page 21: Part 5 - Venting

    199W Pressure (PSI) No Restrictor White Restrictor (factory) Figure 9 – Water Pressure vs. Flow Through the Restrictors – 199W Models PART 5 – VENTING Vent this appliance in accordance with these instructions. Failure to do so will result in property damage, severe personal injury, or death.
  • Page 22 3. This appliance is designed to be installed in a power vent (using indoor air for combustion and vented to the outdoors) type, or as a direct vent (sealed combustion) type. In power vent installations, indoor air is used for combustion and exhaust gases are vented directly to the outdoors through a sealed exhaust vent piped through the wall or roof.
  • Page 23 The building owner is responsible for keeping the exhaust and intake terminations free of snow, ice, or other potential blockages, as well as scheduling routing maintenance. Failure to keep the vent piping terminations clear and properly maintain the heater could result in property damage, severe personal injury, or death.
  • Page 24 Figure 10 – Vent Termination Detail DESCRIPTION CANADA Clearance above grade, veranda, porch, deck, or balcony 1 foot (30 cm) Direct 1 foot Vent Clearance to window or door that may be opened 3 feet (91 cm) Power 4 feet below or to side of Vent opening;...

  • Page 25: Approved Vent Materials

    When installing AL29-4C vent piping, install a PVC-to-stainless adapter at the water heater vent connection, and at the termination when using an HTP PVC termination kit. DO NOT mix AL29-4C piping from different manufacturers unless using adapters specifically designed for the purpose by the manufacturer.

  • Page 26: Tightening Appliance Collar To Exhaust Vent And Intake Pipe

    • 2.5 feet (.75M) for each additional 3” 45 elbow • 8 feet (2.4M) for each additional 2” 90 elbow • 4 feet (1.2M) for each additional 2” 45 elbow • Some terminations are considered elbows, and deduction should be applied. For example, a turndown 90 or an open T termination should be considered a 90 elbow.

  • Page 27: Vent Termination

    Figure 11 – Installing the 6” Length of CPVC into the Exhaust Vent Connection Figure 12 – Transitioning from 3” to 2” Vent Pipe E. VENT TERMINATION 1. Direct Vent, Two Pipe Roof and Sidewall Vent Terminations Figure 13 – Direct Vent, Roof and Sidewall Vent Terminations All vent pipes must be glued, properly supported, and the exhaust must be pitched a minimum of ¼”...

  • Page 28: Direct Vent, Optional Horizontal And Vertical Vent Kits

    2. Direct Vent, Optional Horizontal and Vertical Vent Kits Figure 14 – Direct Vent, Vent Terminations (With Optional Kits) All vent pipes must be glued, properly supported, and the exhaust must be pitched a minimum of ¼” per foot back to the appliance to allow drainage of condensate.

  • Page 29: Power Venting, Indoor Combustion Air Installation In Confined Or Unconfined Space

    4. Power Venting, Indoor Combustion Air Installation in Confined or Unconfined Space This heater requires fresh, uncontaminated air for safe operation and must be installed in a mechanical room where there is adequate combustion and ventilating air. NOTE: To prevent combustion air contamination, see Table 8.
  • Page 30 Figure 17 – NOTE: These drawings are meant to demonstrate system venting only. The installer is responsible for all equipment and detailing required by local codes. LP-520 REV. 5.1.17...

  • Page 31: Part 6 - Install The Condensate Drain

    PART 6 – INSTALL THE CONDENSATE DRAIN 1. Due to its efficient design, the appliance produces condensate (water) as a normal by-product. This condensate is acidic, with a pH level between 3 and 4. This condensate must be drained away from the appliance and disposed in accordance with all local regulations.

  • Page 32: Part 7 - Gas Piping

    If using a condensate pump, select one approved for use with condensing appliances and furnaces. The pump should have an overflow switch to prevent property damage from condensate spillage. It is very important that the condensate piping be no smaller than ¾”. To prevent sagging and maintain pitch, condensate piping should be supported with pipe supports, and pitched ¼”...

  • Page 33: Lp (Liquid Propane) Gas Pipe Sizing

    3. LP (Liquid Propane) Gas Pipe Sizing The following is intended for use for piping between a Single or Second Stage (Low Pressure) Regulator and the appliance. The following tables list maximum capacity of pipe in cubic feet of gas per hour for an inlet pressure of 11 inches water column and specific pressure drop of 0.5 inches water column based on 1.5 specific gravity for liquid propane.
  • Page 34 Figure 20 – Gas Line with Shut-Off Valve Detail Figure 21 – Natural Gas Piping Installation – NOTE: Capacity to be Not Less than Total Capacity of Connected Appliances Figure 22 – LP Gas Piping Installation – NOTE: Capacity to be Not Less than Total Capacity of Connected Appliances LP-520 REV.

  • Page 35: Part 8 - Water Piping

    PART 8 – WATER PIPING A. GENERAL PLUMBING CONNECTION GUIDELINES • Pipe material must be suitable to meet local codes and industry standards. • The pipe must be cleaned and without blemish before any connections are made. • Do not apply a torch within 12” of the appliance. Doing so could damage the appliance. Such damages ARE NOT covered by product warranty.
  • Page 36 Figure 24 – Piping Legend LP-520 REV. 5.1.17...

  • Page 37: Dhw Piping

    Use both thread tape and pipe dope to connect to the ¾” domestic water inlet and outlet. A shut off valve between the city water supply and DHW inlet is recommended for ease of service. HTP offers threaded ¾” DHW tankless isolation valves with DHW pressure relief valve for ease of installation and future service.
  • Page 38 Figure 25 – CH and DHW Piping - NOTES: 1. This drawing is meant to show system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
  • Page 39 Figure 26 – CH Piping – Zoning with Pumps NOTES: 1. This drawing is meant to show system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
  • Page 40 Figure 27 – DHW Priority with Outdoor Reset and Recirculation NOTES: 1. This drawing is meant to show system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.
  • Page 41 Figure 28 – DHW Priority with Outdoor Reset, Boiler Primary Pump, and Recirculation NOTES: 1. This drawing is meant to show system piping concept only. Installer is responsible for all equipment and detailing required by local codes. 2. All closely spaced tees shall be within 4 pipe diameters center to center spacing. 3.

  • Page 42: And Dhw Pressure Relief Valves

    The included 30 psi CH Pressure Relief Valve must be installed on the CH supply line to ensure a compliant installation and safe operation. HTP has supplied a ¾” X 1” bushing to aid installation of the CH Pressure Relief Valve. The valve is meant to be field installed.

  • Page 43: General Operating Conditions

    ELECTRICAL SHOCK HAZARD – To ensure safety, turn off electrical power supply at service entrance panel before making any electrical connections to avoid possible electric shock hazard. Failure to do so could result in property damage, serious personal injury, or death. A.
  • Page 44 Figure 31 – Dip Switch Detail DIP SWITCH GROUP DIP SWITCH 1 – 3 DO NOT MOVE DO NOT MOVE 2” Vent Size 3” Gas Type High Fire Normal Operation High Fire Low Fire Normal Operation Low Fire Table 17 – DIP Switch Group SYSTEM CONTROL SETTINGS MAXIMUM FLAME DETECTING VOLTAGE 2.5V...
  • Page 45 Figure 32 – Electrical Wiring Diagram LP-520 REV. 5.1.17...
  • Page 46 Figure 33 – Ladder Diagram LP-520 REV. 5.1.17...
  • Page 47 CONNECTOR DESCRIPTION HT SELV NO. OF LOCATION BOARD SILK GROUND Power Supply Line External CH Pump Ignitor L(HT) Internal Pump 65001WS-12 Gas Valve HT (120V~) AC Power Supply Neutral 9-12 AC Power COM Line CP2/3WAY 3 Way Valve LW6A4-03 RS485 + SELV (5V) DC RS-485 SMW250-03...
  • Page 48 CONNECTOR DESCRIPTION HT SELV NO. OF LOCATION BOARD SILK Flame Detect Sensor OP.S Operating Water Temperature Sensor DH.S DHW Temperature Sensor NOT USED SELV (5V) LWD1140-14 BG.S Exhaust Temperature Sensor ST.S NOT USED SP.S Over-Heat Temperature Sensor DHM Stepper Motor Position DHM Stepper Motor Coil X Phase SELV (14V) CN14...

  • Page 49: Part 10 - Operating System Instructions

    Figure 34 – Terminal Block Wiring Detail PART 10 – OPERATING SYSTEM INSTRUCTIONS A. CONTROL PANEL Figure 35 – Appliance Control Panel Detail LP-520 REV. 5.1.17...

  • Page 50: Lcd Display Descriptions

    B. LCD DISPLAY DESCRIPTIONS Figure 36 – LCD Display Detail LCD also features a backlit lamp that will illuminate: • When a user action is detected (a button is pressed) • The display has timed out for approximately 2 minutes C.

  • Page 51: Changing The Dhw Set-Point

    • Lock Mode • Error Mode • Status Display Mode • Outdoor Temperature Mode • Installer Mode D. CHANGING THE DHW SET-POINT The display shows the icon when the DHW set-point can be changed. Figure 38 – DHW Set-Point Screens Press the button when the display panel is powered ON to change the DHW Set-Point.

  • Page 52: Storage Mode

    Figure 39 – CH Set-Point Screen C). CH Set-Point range is 86 – 180 F (30 – 82 Factory CH Set-Point is 180 F (82 Turn the dial counterclockwise to lower and clockwise to raise the current CH set-point. After changing the temperature, press the button to save the setting.

  • Page 53: Installer Mode

    Turn the dial counterclockwise and clockwise to scroll through the displayed parameters. To view parameter details, press the button at the appropriate screen. Press the buttons to leave the parameter. Press the button again to return to Operation Mode. To turn on Lock Mode, press the button at the d:Lc parameter.
  • Page 54 Display Default Detail Description 1: EH E0:00 Error history up to 10 Check last 10 error codes (E0 - E9) Select “ON” to delete error code history 2: cE Delete Error history Range: ON or OFF Select “ON” to reset to factory setting (Burner operation time, Ignition cycles, and Supply power time will not be 3: In Initialized system...

  • Page 55: Error Mode

    Internal DHW Storage Tank Sets the Internal DHW Storage Tank Setpoint 24: SF 158 F Setpoint Range:140 ~ 167 Internal DHW Storage Tank Sets the Internal DHW Storage Tank Differential 25: So 27 F Differential Range: 9 ~ 36 Delay time when switching from Range: 0 –...
  • Page 56 Press the Power button to clear the Error Code. 1. Check Condensate and main controller connections. Ensure all are secure. Condensate APS – 2. Check Condensate sensor resistance. If resistance is not zero, replace the switch. Closed is Normal, Open is Er:20 3.
  • Page 57 Error Code Error Code Description Possible Remedies This Error Code will go away when the condition is remedied. Mixing Valve Initial Value If Error happens again: Error 1. Turn power OFF and ON at the main power switch internal to the appliance. Er:66 (Mixing Valve Cannot 2.

  • Page 58: Error Tree Analysis

    K. ERROR TREE ANALYSIS 1. FLAME DETECTION Figure 44 – Flame Detection Error Analysis Tree 2. GAS DETECTION Figure 45 – Gas Detection Error Analysis Tree LP-520 REV. 5.1.17...

  • Page 59: Aps / Burner Overheat Limit / Condensate Block Switch

    3. APS / BURNER OVERHEAT LIMIT / CONDENSATE BLOCK SWITCH Figure 46 – APS / Burner Overheat Limit / Condensate Block Switch Error Analysis Tree 4. DHW / OP / CH OVERHEAT / EXHAUST OVERHEAT SENSORS Figure 47 – DHW / OP / CH Overheat / Exhaust Overheat Sensors Error Analysis Tree L.

  • Page 60: 0-10 Volt Input

    Figure 48 – Outdoor Reset Curve – See Installer Mode for Curve Setting Descriptions M. 0-10 VOLT INPUT 1. A signal from a building management system may be connected to the appliance to enable remote control. This signal should be a 0- 10 volt positive-going DC signal.

  • Page 61: Part 11 - Start-Up Preparation

    PART 11 – START-UP PREPARATION Thoroughly clean and flush any system that has used glycol before installing the appliance. A. CHECK / CONTROL WATER CHEMISTRY Chemical imbalance of the water supply may affect efficiency and cause severe damage to the appliance and associated equipment. Water quality must be professionally analyzed to determine whether it is necessary to treat the water.

  • Page 62: Check For Gas Leaks

    • A 50% mixture of glycol will result in a BTU output loss of 30% with a 50% increase in head against the system circulator. • NOTE: BTU losses apply to both CH and DHW. It is highly recommended to carefully follow the glycol manufacturer’s recommended concentrations, expansion requirements, and maintenance recommendations (pH additive breakdown, inhibitor reduction, etc.) You must carefully calculate the additional friction loss in the system as well as the reduction in heat transfer coefficients.

  • Page 63: Purge Air From Ch And Internal Storage Tank

    4. At initial fill and during appliance startup and testing, check system thoroughly for leaks. Repair all leaks before proceeding further. Eliminate all system leaks. Continual fresh make-up water will reduce appliance life. Minerals can build up in the heat exchanger, reducing heat transfer, overheating the heat exchanger, causing heat exchanger failure and possibly resulting in property damage, severe personal injury, or death.

  • Page 64: Check Thermostat Circuit(S)

    It is very important that the minimum ¾” condensate line is sloped downward away from the appliance to a suitable inside drain. If the condensate outlet on the appliance is lower than the drain, you must use a condensate removal pump, available from HTP (554200).

  • Page 65: Setting And Verifying The Combustion Setting

    NOTICE Do not fire (operate) the appliance until all connections have been completed and the heat exchanger is filled with water. Doing so will damage the appliance and void the warranty. ADJUSTING GAS PRESSURE AT THE APPLIANCE 1. Open the gas line and water valves. 2.
  • Page 66 5. Allow appliance to operate normally. Ensure it is operating properly. 6. Reinstall the appliance front cover. 7. Use a Phillips Head screwdriver to reinstall the appliance top cover. *In order to increase CO values on high fire, the gas orifice size can be increased to achieve the maximum CO value listed in Table 27.

  • Page 67: Part 12 -Installation And Start-Up Checklist

    PART 12 –INSTALLATION AND START-UP CHECKLIST LIGHT OFF ACTIVITIES DATE COMPLETED Has the system been cleaned and flushed? Does water chemistry meet requirements? 1) Fill the If water chemistry does not meet requirements, are treatment measures put in place? Heating System Check all water piping and connections.
  • Page 68 Figure 51 – Flame Sight Glass CH Return Temperature Sensor (7855P-097) CH Supply Temperature Sensor Exhaust Temperature Sensor (7855P-030) Outdoor Temperature Sensor (7855P-092) DHW Temperature Sensor (7855P-084) Storage Tank Temperature Sensor (7855P-094) (7855P-057) Temperature (◦F) Resistance (Ω) Temperature (◦F) Resistance (Ω) Temperature (◦F) Resistance (Ω) 62162...

  • Page 69: Part 13 - Troubleshooting

    PART 13 – TROUBLESHOOTING TROUBLESHOOTING CHART PROBLEM POSSIBLE CAUSES POSSIBLE REMEDIES 1. Is the plug on the power supply cord unplugged from 1. Reset the plug. the electrical outlet? 2. Reset the circuit breaker. No electrical power 2. Is electrical panel’s 10 Amp circuit breaker tripped? 3.

  • Page 70: Part 14 - Annual Maintenance Procedures

    the display control receiving 120V breaker to appliance is turned ON power appliance panel and no other power Troubleshoot and correct the power supply to Is there 120V at the service switch appliance the manual switch components are Is the ON/OFF switch inside the Turn ON the manual power switch inside the operating appliance cabinet is turned on...
  • Page 71 Observe the Control Panel to ensure the appliance is powered on, and to check for any error codes. Clear any debris from the panel. Check Exhaust Vent and Intake Pipe Terminations Verify that the appliance exhaust vent and intake pipe terminations are clean and free of obstructions. Remove any debris from the exhaust vent or intake pipe openings.
  • Page 72 To avoid water damage or scalding due to relief valve operation, a discharge line must be connected to the valve outlet and directed to a safe place of disposal. This discharge line must be installed by a qualified service technician or heating/plumbing installer in accordance with the appliance installation manual.
  • Page 73 Flushing the DHW Loop Heat Exchanger Flushing the heat exchanger is a complicated procedure that should only be performed by a qualified service technician. It is recommended to flush the heat exchanger annually if water hardness exceeds 12 grains per gallon (considered extremely hard water). If water hardness falls below 12 grains per gallon it is recommended to flush the heat exchanger every two to three years.
  • Page 74 Figure 56 – Cleaning the Inlet Filter 6. Reinstall the DHW inlet filter. 7. Purge air from the DHW lines by opening a hot water faucet in the system. When water flows freely, all air is purged. 8. Repeat the process on the CH inlet filter on the appliance. 9.

  • Page 75: Replacement Parts

    could result in property damage, serious personal injury, or death. 6. Fill the condensate trap with fresh water prior to reassembly on the appliance. 7. Install the condensate trap on the condensate hose from the heat exchanger. Use the hose clamp to secure the trap. Attach the clear plastic hose onto the hose barb.
  • Page 76 Figure 58 – Cabinet Replacement Parts – 140W Models PART PART NUMBER DESCRIPTION NUMBER DESCRIPTION NUMBER NUMBER Exhaust Duct (Assembly) 7855P-002 Ignition Transformer 7855P-007 Exhaust/Intake Duct Clamps (Φ100) 15-1 7855P-332 Control Panel Bracket 7855P-219 15-2 Exhaust/Intake Gaskets 7850P-210 Power Switch Bracket 7855P-220 15-3 Exhaust Duct...
  • Page 77 Figure 59 – Water Piping Replacement Parts – 140W Models PART PART NUMBER DESCRIPTION NUMBER DESCRIPTION NUMBER NUMBER DHW Outlet Pipe 7855P-242 DHW Inlet Block Cap 7855P-283 36-1 1/2" Pipe Gasket 7855P-072 DHW Inlet Adapter 7855P-203 36-2 O-ring 7855P-044 DHW Inlet Block Cap 7855P-283 36-3 Clip (DHW Inlet)
  • Page 78 Figure 60 – Heat Exchanger Replacement Parts – 140W Models PART PART NUMBER DESCRIPTION NUMBER DESCRIPTION NUMBER NUMBER Exhaust Pipe 7855P-237 Storage Tank Bracket 7855P-298 Storage Tank Clamp 7855P-297 Air Vent 7855P-063 Exhaust Temperature Sensor Clip 7855P-349 CH Supply Upper Pipe 7855P-239 62-1 Exhaust Temperature Sensor O-ring...
  • Page 79 Figure 61 – Combustion System Replacement Parts – 140W Models PART PART NUMBER DESCRIPTION NUMBER DESCRIPTION NUMBER NUMBER Gas Orifice Nozzle (NG) - 6.5 mm 7855P-228 Burner Inlet Chanel 7855P-231 Gas Orifice Nozzle (LP) - 4.85 mm 7855P-229 Burner Inlet Chanel Gasket 7855P-370 Gas Valve Assembly 7855P-381...
  • Page 80 Figure 62 – Cabinet Replacement Parts – 199W Models PART PART NUMBER DESCRIPTION NUMBER DESCRIPTION NUMBER NUMBER Exhaust Duct Assy 7855P-002 Display Panel 7855P-012 15-1 Exhaust / Intake Duct Clamps 7855P-332 Display Panel Bracket 7855P-413 15-2 Exhaust / Intake Gaskets 7850P-210 Ignition Transformer 7855P-007...
  • Page 81 Figure 63 – Water Piping Replacement Parts – 199W Models PART PART NUMBER DESCRIPTION NUMBER DESCRIPTION NUMBER NUMBER DHW Outlet Pipe 7855P-275 DHW Inlet Block Cap 7855P-283 ¾” Pipe Gasket 38-1 7855P-073 DHW Inlet Adapter 7855P-203 38-2 P-18 O-Ring 7855P-047 CH Block Cap 7855P-283 ½”...
  • Page 82 Figure 64 – Heat Exchanger Replacement Parts – 199W Models PART PART NUMBER DESCRIPTION NUMBER DESCRIPTION NUMBER NUMBER Exhaust Temperature Sensor 7855P-092 Flame Sensor Cover 7855P-357 63-1 Exhaust Temperature Sensor O-Ring 7855P-092 Heat Exchanger Assembly 7855P-416 Exhaust Temperature Sensor Clip 7855P-349 76-1 Burner Body Assembly...
  • Page 83 Figure 65 – Combustion System Replacement Parts – 199W Models PART PART NUMBER DESCRIPTION NUMBER DESCRIPTION NUMBER NUMBER Burner Inlet Chanel (with Damper) 7855P-424 Air Intake Hose Bottom Clamp 7855P-429 Air Damper 7855P-618 APS Hose Fitting 7855P-375 Air Damper Guide 7855P-369 Gas Valve Assembly 7855P-431...

  • Page 84: Limited Warranty For Eftc Appliances

    COVERAGE A. During the first year after the original date of installation, HTP warrants that it will repair or replace, at its option, any defective or malfunctioning component of the appliance with a component of equivalent size and current model. Replacement components will be warranted for ninety (90) days.
  • Page 85 NO OTHER WARRANTIES This HTP Warranty gives you specific legal rights, and you may also have other rights that vary from state to state. Some states do not allow the exclusion or limitation of incidental or consequential damages so this limitation or exclusion may not apply to you.

  • Page 86: Start-Up Report

    START-UP REPORT LIGHT OFF ACTIVITIES DATE COMPLETED ________________ 1) Fill the Check all piping and gas connections, verify all are tight heating system Has the system been cleaned and flushed? Has the appliance and the system been purged of all air? Refer to Start-Up Preparation, this manual.

  • Page 87: Maintenance Report

    MAINTENANCE REPORT In unusually dirty or dusty conditions, care must be taken to keep appliance cabinet door in place at all times. Failure to do so VOIDS WARRANTY! The appliance requires minimal periodic maintenance under normal conditions. However, in unusually dirty or dusty conditions, periodic vacuuming of the cover to maintain visibility of the display and indicators is recommended.

  • Page 88: Maintenance Notes

    MAINTENANCE NOTES LP-520 REV. 5.1.17...

  • Page 89: Customer Installation Record Form

    Customer: Please only sign after the installer has reviewed the installation, safety, proper operation and maintenance of the system. In the case that the system has any problems, please call the installer. If you are unable to make contact, please contact your HTP Sales Representative. Distributor/Dealer: Please insert contact details.

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