Lochinvar Noble NKB 80

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If the information in this manual is not followed exactly, a fire or

explosion may result causing property damage, personal injury or

loss of life.

This appliance MUST NOT be installed in any location where

gasoline or flammable vapors are likely to be present.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electric switch; do not use any phone in your

building.

• Immediately call your gas supplier from a near by phone.

Follow the gas supplier’s instructions.

• If you cannot reach your gas supplier, call the fire department.

• Installation and service must be performed by a qualified

installer, service agency, or the gas supplier.

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Save this manual for future reference.

FIRE TUBE COMBI

™

Noble Fire Tube Boiler and Combi

User Manual

NKC 110 - 199

NKB 80 - 150

Other manuals for Lochinvar Noble NKB 80

Installation & Service Manual100 pages

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Overview

Function Description
Important Technical Specifications (Derived from the manual's context)
Usage Features
Maintenance Features

The document is a user manual for the Noble Fire Tube Boiler and Combi (NKC 110-199 and NKB 80-150), manufactured by Lochinvar. This appliance is a high-efficiency boiler and water heater designed for space heating and domestic hot water (DHW) applications.

Function Description:

The Noble Fire Tube Boiler and Combi is a heating appliance that utilizes a fire tube heat exchanger for high efficiency. It can operate in two primary modes: Space Heating and Domestic Hot Water (DHW) Heating.

Space Heating Mode: When the boiler control receives a call for heat and there is no active DHW call, it activates the boiler pump and positions the diverter valve for space heating. The boiler modulates to meet the set point temperature. After the call for heat ends, the boiler pump continues to run for a short period (factory set to 30 seconds) before turning off and returning the diverter valve to the DHW position.
Domestic Hot Water (DHW) Heating Mode: When the DHW flow switch detects a call for heat, the boiler pump is activated, and the diverter valve moves to the DHW position. This routes boiler water through a brazed plate heat exchanger to heat domestic hot water. The boiler modulates to maintain the DHW outlet temperature at the DHW set point. Similar to space heating, the pump continues to run for a short delay after the DHW call ends. The appliance features an automatic ignition device, eliminating the need for a pilot light. It is equipped with a control that automatically shuts down the boiler if air or vent flow is blocked.

Important Technical Specifications (Derived from the manual's context):

Models: NKC 110-199 (Combi) and NKB 80-150 (Boiler).
Heat Exchanger Type: Fire Tube (for boiler) and Brazed Plate (for DHW in Combi models).
Condensate: Produces slightly acidic condensate (pH 3 to 5), requiring a 3/4 inch PVC pipe connection for drainage and potentially a neutralizing filter as per local codes.
Control System: SMART SYSTEM Control Module for setting temperatures, operating conditions, and monitoring boiler operation.
Safety Features:
- Automatic shutdown for air/vent blockage.
- Low Water Cutoff (LWCO) (if installed).
- Relief valve to prevent overpressure.
- Gas pressure switches.
- Louver proving switch and blocked drain switch.
- Post-purge and anti-cycling periods for efficient and safe operation.
Electrical Supply: Requires disconnection of electrical supply before maintenance to avoid shock.

Usage Features:

Control Panel (SMART SYSTEM Control Module):
- Buttons: RESET, UP, DOWN, LEFT, RIGHT, MENU/ENTER, SETPOINTS, SAVE.
- Display Window: Shows operational status, outlet/inlet/system temperatures, and set points.
- Access Modes: User mode for basic settings, Installer mode for advanced parameters.
- Parameter Adjustment: Use UP/DOWN buttons to change values, LEFT/RIGHT buttons to navigate parameters.
- Saving Parameters: Parameters are saved automatically after a timeout or by pressing the LEFT button to return to the Base Screen.
Operating Instructions:
- Startup: Set thermostat to lowest, turn off electric power, remove front door, move switch to "OFF," wait 5 minutes, move switch to "ON," install front door, turn on electric power, set thermostat to desired setting.
- Shutdown: Set thermostat to lowest, turn off electric power, remove front door, move switch to "OFF," install front door.
- Gas Leak Procedure: If gas is smelled, do not light appliances, do not touch electrical switches, do not use phones in the building. Immediately call the gas supplier or fire department from a nearby phone.
Freeze Protection: If the system is to be drained for shutdown in freezing temperatures, it should be filled with inhibited propylene glycol solutions specifically formulated for hydronic systems. Automotive antifreeze or ethylene glycol should NEVER be used.

Maintenance Features:

The manual outlines a comprehensive maintenance schedule for both owners and service technicians to ensure maximum boiler efficiency, reliability, and safety.

Daily Owner Maintenance:
- Check boiler area for obstructions or contaminants.
- Check pressure/temperature gauge (should not exceed 24 psi).
Monthly Owner Maintenance:
- Check vent piping for blockage, leakage, or deterioration.
- Check air piping for obstructions and sealed joints.
- Check air and vent termination screens.
- Check relief valve for weeping or leakage.
- Inspect condensate drain system.
Periodical Owner Maintenance:
- Test low water cutoff (if installed).
- Reset button (low water cutoff).
Every 6 Months Owner Maintenance:
- Check boiler piping (gas and water) for leaks.
- Operate relief valve.
End of Season Owner Maintenance:
- Shut boiler down (unless used for domestic hot water). Do not drain unless freezing temperatures will occur or if filled with antifreeze solution.
Annual Service Technician Maintenance (Annual Start-up):
- Address reported problems.
- Inspect interior, clean, and vacuum.
- Clean condensate trap.
- Check for leaks (water, gas, flue, condensate).
- Verify flue and air lines are in good condition and sealed.
- Check system water pressure/piping/expansion tank.
- Check fill water meter.
- Test boiler water and clean system water with approved restorer if needed.
- Check control settings.
- Check ignition electrodes (sand off deposits, clean, reposition).
- Check wiring and connections.
- Perform start-up checkout and performance verification.
- Flame inspection (stable, uniform).
- Flame signal (at least 10 microamps at high fire).
- Clean heat exchanger if flue temperature is more than 54°F above return water temperature.
- Inspect and clean the DHW flow switch filter and sanitary bypass filter in the Combi water set.
- If needed: Clean heat exchanger, remove and clean burner with compressed air only, clean blower wheel.
Condensate System Maintenance:
- Clean/Inspect Trap Assembly: Remove clean out cap, drain condensate and debris.
- Condensate Drain: Ensure proper slope, use plastic tubing/piping, do not expose to freezing temperatures. A neutralizing filter may be required.
Corrosive Contaminants: The manual strongly warns against installing the boiler in areas with corrosive contaminants (e.g., chlorine, fluorine compounds from laundry products, pool chemicals, refrigerants, paints, etc.) as these can damage the boiler and lead to severe personal injury or death. If contaminants are present, they must be removed, or the air inlet/vent terminations must be relocated.

The manual emphasizes that installation and service must be performed by a qualified installer, service agency, or gas supplier. Failure to follow maintenance procedures can result in damage, personal injury, or death.