Navien NCB-180 Installation & Operation Manual
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Navien NCB-180 Installation & Operation Manual

Combination boiler
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Installation & Operation
Manual
Getting Service
If your NCB boiler requires service, you have several options for getting service:
Contact Technical Support at 1-800-519-8794 or on the website: www.navienamerica.com. For
●
warranty service, always contact Technical Support first.
Contact the technician or professional who installed your boiler.
●
Contact a licensed professional for the affected system (for example, a plumber or electrician).
●
When you contact Technical Support, please have the following information at hand:
Model number
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Serial number
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Date purchased
●
Installation location and type
●
Error code, if any appears on the front panel display.
●

Combination Boiler

Navien America, Inc.
20 Goodyear lrvine, CA 92618 TEL +949-420-0420 FAX +949-420-0430 www.navienamerica.com
Version: 1.00(Oct. 02. 2013)

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Summary of Contents for Navien NCB-180

  • Page 1: Combination Boiler

    Combination Boiler Installation & Operation Manual Getting Service If your NCB boiler requires service, you have several options for getting service: Contact Technical Support at 1-800-519-8794 or on the website: www.navienamerica.com. For ● warranty service, always contact Technical Support first. Contact the technician or professional who installed your boiler.
  • Page 2 Combination Boiler Installation & Operation Manual Model NCB-180/ 210/ 240 * Lead Free Keep this manual near this boiler for future reference whenever maintenance or service is required. * The wetted surface of this product contacted by consumable water contains less than one quarter of one percent(0.25%) of lead by weight.
  • Page 3 Requirements for the State of Massachusetts NOTICE BEFORE INSTALLATION This appliance must be installed by a licensed plumber or gas fitter in accordance with the Massachusetts Plumbing and Fuel Gas Code 248 CMR Sections 2.00 and 5.00. IMPORTANT: In the State of Massachusetts (248 CMR 4.00 & 5.00) For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall...

  • Page 4: Table Of Contents

    Contents Safety Information 7. Connecting the Power Supply 1. About the Boiler 8. Installation Check list 1.1 Items Included 9. Operating the Boiler 1.2 Accessories 1.3 Specifications 9.1 Turning the Boiler On or Off 1.4 Components 9.2 Adjusting the Temperature 1.5 Dimensions 9.3 Viewing Basic Information 1.6 Rating Plate...

  • Page 5: Safety Information

    Safety Information The following safety symbols are used in this manual. Read and follow all safety instructions in this manual precisely to avoid DANGER unsafe operating conditions, fire, explosion, property damage, personal injury, or death. DANGER Indicates an imminently hazardous situation which, if not avoided, could result in severe injury or death.
  • Page 6 CAUTION WARNING Do not turn on the boiler unless the water and gas ● supplies are fully opened. Doing so may damage the boiler. Do not turn on the water if the cold water supply shut- ● off valve is closed. Doing so may damage the boiler.
  • Page 7 DANGER DANGER This boiler’s water temperature is set to 120°F (49°C) at the factory for your safety and comfort. Increasing the temperature increases the risk of accidental scalding. Water temperatures at or above 125°F (52°C) can cause instant scalding, severe burns, or death.

  • Page 8: About The Boiler

    1. About the Boiler 1.1 Items Included When you open the box, you will find the following items with the boiler. Check the box for each of the following items before installing the boiler. Installation & Operation Manual, Quick Installation Manual Wall Mounting Bracket Tapping Screws &...

  • Page 9: Specifications

    Space Heating Ratings Heating Input, MBH Model Number Heating Capacity , MBH Net AHRI Rating Water , MBH AFUE NCB-180 93.5 NCB-210 93.6 NCB-240 93.3 1. Ratings are the same for natural gas models converted to propane use. Note 2. Based on U.S. Department of Energy (DOE) test procedures.
  • Page 10 General Specifications Item NCB-180 NCB-210 NCB-240 Dimensions 17 in (W) x 28 in (H) x 12 in (D) Weight 74 lbs (34 kg) 84 lbs (38 kg) 84 lbs (38 kg) Installation Type Indoor Wall-Hung Venting Type Forced Draft Direct Vent...

  • Page 11: Components

    1.4 Components The following diagram shows the key components of the boiler. Component assembly diagrams and particular parts lists are included in the Appendixes. Intake Air Exhaust Air Filter Flue Duct Mixing Chamber Ignitor & Flame Rod Condensate Trap Front Panel Auto Feeder (Make-up water) Power Switch...
  • Page 12 Fan & Motor Dual Venturi Ignition Transformer High Limit Switch Premix Burner Primary Heat Exchanger Air Pipe Secondary Heat Exchanger Gas Pipe Pressure Sensor (LWCO) Air Vent DHW Heat Exchanger Gas Valve Circulation Pump Flow Sensor 3-Way Valve DHW Inlet Filter (with built-in flow restrictor) Space Heating DHW Inlet...

  • Page 13: Dimensions

    1.5 Dimensions The following diagrams show the dimensions of the boiler and the table lists the supply connections. Supply Connections Description Diameter Air Intake 2 in Exhaust Gas Vent 2 in Space Heating Supply 1 in Space Heating Return 1 in Hot Water Outlet (DHW) Gas Supply Inlet Cold Water Inlet (DHW)

  • Page 14: Rating Plate

    Tel: (949) 420 – 0420 Direct vent indoor installation, * Évacuation directe installation intérieure Model No., *Numéro de modèle Type of Gas, *Type de gaz NCB-180 Max. Input Rating (DHW),*Entrée GPL max. Min. Input Rating, *Débit calorifique max. 150,000 Btu/h 14,000 Btu/h Max.

  • Page 15: Installing The Boiler

    2. Installing the Boiler 2.1 Choosing an Installation Location Adequate Venting and Ventilation Select a location that requires minimal venting. Consider venting When choosing an installation location, you must ensure that the restrictions caused by windows, doors, air intakes, gas meters, location provides adequate clearance for the boiler, adequate foliage, and other buildings.
  • Page 16 Adequate installation clearances Clearance from: Indoor Installation 9 in (229 mm) minimum CAUTION Back 0.5 in (13 mm) minimum Do not install the boiler on carpeting. Front 4 in (100 mm) minimum Sides 3 in (76 mm) minimum Install the boiler in an area that allows for service and maintenance Bottom 12 in (300 mm) minimum access to utility connections, piping, filters, and traps.

  • Page 17: Mounting The Boiler To The Wall

    2.2 Mounting the Boiler to the Wall WARNING Navien NCB boilers come with an upper mounting bracket that is pre-drilled at 16 in (400 mm) on center for easy installation on The boiler is heavy. Always lift the unit with assistance. Be ●...

  • Page 18: Installing The System Piping

    3. Installing the System Piping 3.1.1 Guidelines for a Space Heating Installation Prior to connecting plumbing to the boiler, flush the entire system to ensure it is free of sediment, flux, solder, scale, debris or other impurities that may be harmful to the system and boiler. During Read and follow the guidelines listed below to ensure safe and the assembly of the heating system, it is important to keep the proper installation of a boiler heating system.
  • Page 19 Oxygen Elimination External LWCO Install a separate LWCO device if required by local codes. The This boiler may only be installed in a pressurized closed-loop following figure illustrates an example of typical LWCO installation. heating system, free of air (oxygen) and other impurities. To avoid the presence of oxygen, ensure all of the air is removed from the system during commissioning via strategically placed and External...
  • Page 20 Back-flow Preventer Pressure Relief Valve Install a backflow preventer valve in the make-up water supply to To complete the space heating system installation, you must install the unit as required by local codes. in, maximum 30 psi pressure relief valve on the space heating hot water outlet.

  • Page 21: Installing A Domestic Hot Water (Dhw) System

    3.2 Installing a Domestic Hot Water (DHW) When installing the pressure relief valve, follow these guidelines: System Ensure that the valve’s discharge capacity is equal to or greater ● than the maximum pressure rating of the boiler’s space heating system. The Navien NCB boiler provides domestic hot water continuously when flow is sensed by the flow sensor.
  • Page 22 Flow Restrictor (pressure regulator) Contaminant Maximum Allowable Level Total Dissolved Solids (TDS) 500 mg/l A flow restrictor is used to avoid excessive flow at the faucets. The Navien NCB boiler has a built-in flow restrictor at the cold water Zinc 205 mg/l inlet adapter to limit the overall flow of domestic hot water.
  • Page 23 If necessary, replace the factory-installed flow restrictor with one Pressure Relief Valve for DHW that satisfies your flow requirements. Follow these instructions to replace the flow restrictor. To complete the installation of the DHW system, you must install an approved in, maximum 150 psi pressure relief valve on 1.

  • Page 24: Connecting The Condensate Drain

    When installing pressure relief valve, follow these guidelines: When installing the DHW system, follow these guidelines: Ensure that the valve’s discharge capacity is equal to or greater Use only pipes, fittings, valves, and other components (such as ● ● than the maximum pressure rating of the boilers DHW system. solder), that are approved for use in potable water systems.
  • Page 25 Before connecting the condensate drain, choose one of the To connect the condensate drain: following disposal options: 1. Connect a drain line to the in fitting at the bottom of the boiler. Use only corrosion-resistant material for the drain line, such as PVC or CPVC.

  • Page 26: System Fill Connection

    3.4 System Fill Connection 3.4.2 External Water Fill Connection External water fill connection may be installed on the system Before filling the boiler, remove the air vent cap to allow the piping if it is required for specific applications. See the following system to fill properly.

  • Page 27: Testing The Water System

    3.5 Testing the Water System 3.6 Examples of System Applications Refer to the following examples to properly implement a system for space heating, DHW supply, or both. These examples are WARNING provided to suggest basic guidelines when you install the boiler system.
  • Page 28 Follow the installation instructions included with the air removal Thermostat Configuration for the Air Handler Interface device when placing it in the system; air removal devices generally work better when placed higher in the system. Always locate air Set the PCB DIP SW2 #7 to down position (OFF) to use a thermostat removal devices in areas of the system that have a guaranteed with the Air Handler.
  • Page 29 3.6.2 System Application - Zone System with Zone Valves System application drawings are intended Additional Zone Note ● to explain the system piping concept only. Refer to 3.4 System Fill Connection on ● page 25 for make-up fill connections Zone #2 and refer to the requirements of your local codes to ensure compliance.
  • Page 30 3.6.3 System Application - Zone System with Circulators System application drawings are intended Additional Zone Note ● to explain the system piping concept only. Refer to 3.4 System Fill Connection on ● page 25 for make-up fill connections Zone #2 and refer to the requirements of your local codes to ensure compliance.
  • Page 31 3.6.4 System Application - Air Handler System The boiler performs automatically System Note ● application drawings are intended to explain the system piping concept only. Refer to 3.4 System Fill Connection on ● page 25 for make-up fill connections and refer to the requirements of your local codes to ensure compliance.

  • Page 32: Connecting The Gas Supply

    4. Connecting the Gas Supply To connect the gas supply: WARNING 1. Determine the gas type and pressure for the boiler by referring to the rating plate. Before connecting the gas supply, determine the gas type ● and pressure for the boiler by referring to the rating plate. Use 2.
  • Page 33 Tighten the boiler connection valves with care to Typical LP Gas piping examples: Note ● avoid damage. The gas connection fitting on all boilers is Single Regulator System ● in rigid pipe can be used; refer to the sizing ● tables on the proceeding pages for limitations.

  • Page 34: Gas Pipe Sizing Tables

    4.1 Gas Pipe Sizing Tables The following tables are referenced from 2012 National Fuel Gas Code for reference only. Please consult the gas pipe manufacturer for actual pipe capacities. Maximum Natural Gas Delivery Capacity in Cubic Feet (ft ) per Hour (0.60 Specific Gravity; 0.5 in WC Pressure Drop). Contact your gas supplier for BTU/ft ratings.

  • Page 35: Measuring The Inlet Gas Pressure

    Maximum Liquefied Propane Delivery Capacity in Thousands of BTU/H (0.5 in WC Pressure Drop) Length (including fittings) Pipe Size 10 ft 20 ft 30 ft 40 ft 50 ft 60 ft 80 ft 100 ft 125 ft 150 ft 175 ft 200 ft 250 ft (3 m)
  • Page 36 2. Open a hot water faucet. The boiler should turn on and the gas 6. Re-open the manual gas valve and check for leaks. in the gas supply line will be purged. 7. Open multiple fixtures that have high flow rates, such as 3.

  • Page 37: Venting The Boiler

    5. Venting the Boiler Do not store hazardous or flammable substances near the vent ● termination. WARNING If this boiler will be installed in areas where snow is known to ● accumulate, protect the vent termination from blockage. Improper venting of the boiler can result in excessive levels of carbon monoxide, which can lead to severe personal injury or Provide a minimum of 1 foot clearance from the bottom of the ●...
  • Page 38 Description Canadian Direct Vent Installations US Direct Vent Installations Clearance above grade, veranda, porch, deck, or balcony 12 in (30 cm) 12 in (30 cm) Clearance to window or door that may be opened 36 in (91 cm) 12 in (30 cm) Clearance to permanently closed window Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2 ft (61 cm) from...
  • Page 39 ANSI Z223.1/NFPA 54 or CAN/CGA B-149.1: If, at any time, the installation location could experience negative pressure, there is a possibility of back drafting cold air through the NCB-180 NCB-210 NCB-240 boiler’s heat exchanger. This situation could lead to the freezing of Maximum Input the heat exchanger and malfunction of the boiler.
  • Page 40 Canadian Non-Direct Vent US Non-Direct Vent Description Installations Installations Clearance above grade, veranda, porch, deck, or balcony 12 in (30 cm) 12 in (30 cm) 48 in (120 cm) below or to side Clearance to window or door that may be opened 36 in (91 cm) of opening;...

  • Page 41: Selecting Vent Pipe Materials

    5.2 Selecting Vent Pipe Materials Venting requirements differ in the US and Canada. Consult the following chart or the most recent edition of ANSI Z223.1/NFPA 54 or CAN/CGA B149.1, as well as all applicable local codes and regulations when selecting vent pipe materials. Do not use cellular core based pipe materials for the exhaust vent.

  • Page 42: Terminating The Vent

    5.4 Terminating the Vent Indoor Boiler Installation Venting Examples The following are some possible indoor venting options: Before installing the boiler, determine what type of vent termination is appropriate for the installation location and 2 in or 3 in Two-pipe Sidewall Venting ●...
  • Page 43 Non-concentric Sidewall Venting – Air is drawn from a different 2 in or 3 in Two-pipe Vertical Venting – Intake and exhaust pipes ● ● location that is at least 12 in (300 mm) away from the exhaust do not have to terminate in the same area. termination.

  • Page 44: Setting The Dip Switches

    6. Setting the DIP Switches 6.1 PCB DIP Switches CAUTION Dip Switch 2 (Set of 8) Do not remove the front cover unless the power to the boiler is turned off or disconnected. Failure to do so may The DIP SW 2 on the circuit board configures additional features at result in electric shock.

  • Page 45: Front Panel Dip Switches

    6.2 Front Panel Dip Switches Dip Switch 2 (Set of 2) The DIP SW 2 on the front panel configures the gas type settings. Dip Switch 1 (Set of 10) Before changing the settings, lift the rubber cover to access the front panel DIP switches.

  • Page 46: Connecting The Power Supply

    7. Connecting the Power Supply We recommend using a surge protector to protect the boiler ● from power surges. WARNING If there is a power failure in cold weather areas, the freeze ● prevention system in the boiler will not operate and may Improperly connecting the power supply can result in electrical result in freezing of the heat exchanger.

  • Page 47: Installation Check List

    8. Installation Check list After installing the boiler, review the following checklist. You should be able to answer “Yes” to all of the items in the checklist. If not, review the appropriate sections to complete the installation. To troubleshoot any operational problems refer to “Troubleshooting” in the Owner’s Manual. If you have additional questions or need assistance with installation, contact Technical Support at 1-800-519-8794 or 1-949-420-0420, or refer to the technical support section of Navien’s website (www.navienamerica.com).
  • Page 48 Connecting a Pressure Relief Valve Have you installed an approved pressure relief valve on the boiler? Does the rating of the pressure relief valve match or exceed the maximum BTU rating of the boiler? Is the pressure relief valve in on the hot water outlet and in on the space heating outlet? Have you installed the pressure relief valve on the space heating and hot water outlet pipe near the boiler? Have you installed a discharge drain tube from the pressure relief valve to within 6-12 in (150-300 mm) of the floor?
  • Page 49 PCB DIP switch setting (DIP SW 2, set of 8) Is switch #1 set correctly for Return Water Control (ON) or Supply Water Control (OFF)? Unless continuous boiler operation is required, is switch #7 in the up (ON) position? Unless using the Exhaust Thermostat, is switch #8 in the up (ON) position? Front Panel DIP switch setting (DIP SW 1, set of 10) Is switch #2 set correctly for Celsius (ON) or Fahrenheit (OFF)? Unless using the well pump, is switch #3 set in the down (OFF) position?

  • Page 50: Operating The Boiler

    9. Operating the Boiler 9.1 Turning the Boiler On or Off 2. Press the + (Up) or – (Down) buttons until the desired temperature appears on the display. To turn the boiler on or off, press and hold the Power button for 3 seconds.

  • Page 51: Viewing Basic Information

    9.2.2 Adjusting the DHW Temperature 9.3 Viewing Basic Information To view information about the boiler, press the Mode button three times. “INFO” will appear on the display. WARNING Before adjusting the water temperature, read “To prevent burns:” on page 6 carefully. Water above 120°F (52°C) can cause instant scalding, severe burns, or death.

  • Page 52: Setting The Operation Mode

    2. Press the + (Up) button two times to change the display to Display Description “3.OPR”. Outdoor air temperature (°F) 3. Press the Mode Button once to access the Operation Mode (with optional Outdoor Temperature menu. Sensor only) 4. Press the + (Up) button once to set the boiler to operate at 1-stage MIN (“MIN.1”).
  • Page 53 3. Press the Mode button and enter your 4-digit password. Use This mode is used to configure the Outdoor Reset Control mode. the + or – buttons to increase or decrease numbers and the This mode is disabled by default from the factory. Diagnostic button to move between digits.
  • Page 54 Types of Heat Load Outdoor Low Temperature Setting Range Supply Set- Return Set- Range Remarks Heat Load Remarks point Range point Range -4°F (-20°C) ~ [Outdoor High 1. Finned Tube 120-180°F 101-147°F Temperature Set-point - 9°F Default: 14°F (-10°C) Default Baseboard (48.5-82°C) (38-63.5°C)
  • Page 55 Setting the Pump Freeze Protection Temperature Setting the Boost Interval Time Display Description Display Description Pump freeze protection temperature Boost interval time (min) (°F) This menu is used to configure the circulation pump freeze The boost interval time may be set to prevent interruption in protection temperature.
  • Page 56 Setting the Pump Overrun Time Setting the Burner-Off Temperature Display Description Display Description Pump overrun time (min) Burner-off temperature (°F) The pump overrun time is the duration that the circulation During space heating, the boiler turns off the burner when the pump will continue to run when the space heating supply or space heating supply temperature meets or exceeds the burner-off return temperatures reach the set values for boiler operation...
  • Page 57 Setting the Supply Absolute MAX Temperature Setting the Return Absolute MAX Temperature Display Description Display Description Supply absolute MAX set point (°F) Return absolute MAX set point (°F) This menu may be used to make changes to the maximum supply This menu may be used to make changes to the maximum return temperature range when the Supply Control mode is in use.

  • Page 58: Resetting The Boiler

    Setting the Automatic Make-up Water Feeder Pressure Setting a New Password Display Description Display Description AWS pressure operation Changing password This menu may be used to allow the boiler to maintain the space This menu may be used to set a new password to access the heating system water pressure to ensure that a sufficient amount parameter setting menu.

  • Page 59: Appendixes

    This boiler is configured for Natural Gas from the factory. If conversion to Propane Gas is required, the conversion kit supplied with the boiler must be used. Model 1STAGE 2STAGE 1STAGE 2STAGE WARNING NCB-180 Ø4.80 Ø5.95 Ø3.80 Ø4.60 NCB-210 Ø6.10 Ø6.30 Ø4.50 Ø4.80...
  • Page 60 6. Loosen the three screws indicated in the figure. 8. With the internal components exposed, locate the gas inlet pipe and the gas valve in the middle of the unit, as shown in Figure 2. Gas Inlet Pipe Gas Valve Figure 2.
  • Page 61 Once the Gas Orifice is exposed, remove the two screws that hold the part in place. Remove the Gas Orifice from its housing and prepare the new Gas Orifice for the LP conversion for installation. Remove two 2 screws here Gas Orifice O-ring Figure 4.
  • Page 62 14. Set the front panel Dip Switch to change the gas type. For LP, set Dip Switch 2 #2 to On. For NG, set DIP SW2 #2 to Off. WARNING Ensure that you have turned off the power to the boiler before accessing the DIP switches.
  • Page 63 Figure 7. Insert the Analyzer High fire Low fire Model Fuel Figure 8. Set Screw Location NCB-180 The set screw is located behind the screw-on Note 10.2 10.8 cover. This must be removed first. d. Fully open several hot water fixtures and set the boiler to NCB-210 operate at 2-stage D.
  • Page 64 The set screw is located behind the screw-on Note NAC-400 -0.04 in ±0.01 in cover. This must be removed first. NCB-180 NAC-04 -0.03 in ±0.01 in d. At high fire, do not check the offset value and never adjust the gas valve.

  • Page 65: Wiring Diagram

    10.2 Wiring Diagram Appendixes...

  • Page 66: Ladder Diagram

    10.3 Ladder Diagram NEUTRAL EXT_PUMP Relay 1 FILTER Relay 2 VENTURI Relay 3 IGNITER Relay PUMP Relay 5 3 WAY Primary SMPS Speed Control DC15V Secondary DC24V DC12V 24V OUTPUT DC5V Auto Water 220V Supplement Flame Rod Flow Sensor H.T.L Hall Sensor DHW Inlet WD-PSS...

  • Page 67: Component Assembly Diagrams And Parts Lists

    10.4 Component Assembly Diagrams and Parts Lists 10.4.1 Case Assembly Appendixes...
  • Page 68 Description Part # Remark Intake Air Duct Assembly 30008662B Exhaust Pipe Assembly 30008673A Case 20027375A Intake Air Filter 20007668A Air Pressure Sensor 30010346A 30012262A Front Panel 30012269A Cover 30012276A Appendixes...
  • Page 69 10.4.2 Burner Assembly Appendixes...
  • Page 70 Description Part # Remark Damper 30008825A O-Ring (G50) 20003019A Fan Bracket 20022095A Siphon 30012280A 30010353A NCB-180 Burner Chamber Ass'y 30008440A NCB-210/240 Igintion Transformer 30010455A 20021677A NCB-180 Burner Packing 20021672A NCB-210/240 30012322A NCB-180 Heat Exchanger Ass'y 30012321A NCB-210 30012317A NCB-240 Thermistor (Exhaust)
  • Page 71 10.4.3 Waterway Assembly 35 19 Description Part # Remark 30008181A NCB-180 DHW Heat Exchanger 30005017A NCB-210/240 Thermistor 30008366A O-Ring (P18) 20006954A DHW Outlet Elbow 30012328A Packing 20006852A Thermistor 30008366A Appendixes...
  • Page 72 Description Part # Remark DHW Outlet Adpator 30003747A DHW Flow Sensor 30012033A O-Ring (P14) 20006952A DHW Cold Water Adaptor 30010317A O-Ring (P20) 20017212A DHW Cold Water Filter Air Vent 30012277A Auto Fill Valve 30012241A O-Ring (P16) 20011438A Fastner 20007859A Auto Fill Valve Adaptor 3-Way Outlet Adaptor B 30012332A Fastner...
  • Page 73 10.4.4 Fan (Gas) Assembly Appendixes...
  • Page 74 NCB-210/240 20019142A NCB-180 Silence 20023829A NCB-210/240 20023861A NCB-180 Silence Adaptor 20019141A NCB-210/240 Venturi Packing 20022660A NCB-180 20024159A NCB-180 (NG) 20024190A NCB-210/240 (NG) Gas Orifice 20019144A NCB-180 (LP) 20024189A NCB-210/240 (LP) O-Ring (P34) 20019090A Gas Adapter 30008431A O-Ring (P20) 20006934A 30012338A...

  • Page 75: Outdoor Temperature Sensor (Optional)

    10.5 Outdoor Temperature Sensor 10.6 Outdoor Reset Control (Available with (Optional) Optional Outdoor Temperature Sensor) The Outdoor Reset Control feature may be used to enhance energy Outdoor Temperature Sensor Installation efficiency while maintaining optimal heating performance. With the Outdoor Reset Control, the space heating temperature setting 1.
  • Page 76 Outdoor Temperature Sensor Installation Guidelines Supply Set-point Return Set-point Heat Load Range Range Finned Tube 120-180°F 101-147°F Baseboard (default) (48.5-82°C) (38-63.5°C) 140-180°F 116-147°F Fan Coil (60-82°C) (46.5-63.5°C) 100-170°F Cast Iron Baseboard 86-139°F (30-59°C) (37.5-76.5°C) 80-140°F 70-116°F Low Mass Radiant (26.5-60°C) (21-46.5°C) 80-120°F High Mass Radiant...
  • Page 77 Memo...

This manual is also suitable for:

Ncb-210Ncb-240

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