Bradford White Laars NEOTHERM NTH Series Installation And Operation Instruction Manual
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Bradford White Laars NEOTHERM NTH Series Installation And Operation Instruction Manual

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Installation and Operation Instructions
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water boiler and heater installation and maintenance. Improper installation and/or operation
could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or
death. Improper installation and/or operation will void the warranty.
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.
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• 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
nearby 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 gas
supplier.
Outdoor models
NTH & NTV
Indoor models
Sizes 285 – 850 MBTU/h
NTH
Sizes 150 – 850 MBTU/h
NTV
WARNING
Installation and Operation
Instructions for
with Touchscreen Display
Modulating Boilers and
Volume Water Heaters
Sizes 150 – 850 MBTU/h
AVERTISSEMENT
Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d'incendie ou d'explosion
ou pour éviter tout dommage matériel, toute
blessure ou la mort.
Ne pas entreposer ni utiliser d'essence ni
d'autres vapeurs ou liquides inflammables dans
le voisinage de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d'allumer d'appareils.
• Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones dansle bâtiment où vous
vous trouvez.
• Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions
du fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de
gaz, appelez le sservice des incendies.
L'installation et l'entretien doivent être assurés par
un installateur ou un service d'entretien qualifié ou
par le fournisseur de gaz.
Document 1330E
®

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Summary of Contents for Bradford White Laars NEOTHERM NTH Series

  • Page 1 Installation and Operation Instructions Document 1330E Installation and Operation Instructions for ® with Touchscreen Display Modulating Boilers and Volume Water Heaters Outdoor models Sizes 150 – 850 MBTU/h NTH & NTV Indoor models Sizes 285 – 850 MBTU/h Sizes 150 – 850 MBTU/h FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water boiler and heater installation and maintenance.

  • Page 2: Table Of Contents

    LAARS Heating Systems Table of Contents SECTION 1 SECTION 6A General Information Water Connections - Boiler 6A.1 Boiler System Piping: Hot Supply Introduction ............1 Connections ............ 28 Warranty ............1 6A.2 Boiler Cold Water Make-Up ......28 1.C Model Identification ........... 1 6A.3 Condensate Drain ...........
  • Page 3 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM SECTION 8 SECTION 9 Using the Touch Screen First Start Up and Adjustment The Touch Screen ........47 Filling the Boiler System ......... 71 Using the Touch Screen ........ 47 First Operation ..........
  • Page 4 LAARS Heating Systems...

  • Page 5: General Information 1.A Introduction

    Page 1 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM SECTION 1 1.C Model Identification GENERAL INFORMATION 1.A Introduction Consult the Rating Plate on the side of the unit. The This manual provides information necessary for the following information describes the model nomenclature installation, operation, and maintenance of LAARS (number structure).

  • Page 6: D Safety

    Page 2 LAARS Heating Systems 1.D Safety Notes DANGER WARNING These units must be installed in accordance with • Water temperature over 125°F (52°C) can cause the procedures detailed in this manual, or the severe burns instantly or death from scalds. Manufacturer’s warranty will be voided.
  • Page 7 Page 3 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM WARNING Electrical Shock Hazard Electrical shock can cause severe injury, death or property damage. Disconnect the power supply before beginning installation or changing the wiring to prevent electrical shock or damage to the equipment. It may be necessary to turn off more than one power supply disconnect.

  • Page 8: E Appliance Overview

    Page 4 LAARS Heating Systems Model Overview Both also have the Rating Plate on the outside panel These units are offered in both Indoor and Outdoor to the right. See Figure 8 on page 8 models for all sizes. The physical appearance of the indoor and outdoor units is drastically different because The only component (interior) difference between the the outdoor model offers a fully weathertight enclosure...
  • Page 9 Page 5 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM EXHAUST VENT CONNECTION PRESSURE RELIEF VALVE GAS CONNECTION WATER INLET WATER OUTLET AIR INLET CONNECTION TOUCHSCREEN AIR PRESSURE SWITCH ON / OFF SWITCH DRAIN VALVE HEAT EXCHANGER GAS VALVE AIR TRANSITION CONDENSATE TRAP AIR/ GAS...
  • Page 10 Page 6 LAARS Heating Systems EXHAUST VENT CONNECTION WATER INLET PRESSURE RELIEF VALVE WATER OUTLET GAS CONNECTION TOUCHSCREEN AIR INLET CONNECTION ON / OFF SWITCH HEAT EXCHANGER MANUAL SHUTOFF DRAIN VALVE GAS VALVE CONDENSATE TRAP AIR/ GAS BLOWER GAS VALVE VENTURI Figure 4.
  • Page 11 Page 7 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM EXHAUST VENT CONNECTION WATER INLET GAS CONNECTION WATER OUTLET PRESSURE RELIEF VALVE AIR INLET CONNECTION TOUCHSCREEN AIR PRESSURE SWITCH ON / OFF SWITCH DRAIN VALVE MANUAL SHUTOFF GAS VALVE CONDENSATE TRAP HEAT EXCHANGER AIR/ GAS BLOWER...
  • Page 12 Page 8 LAARS Heating Systems CONNECTION EXHAUST WATER OUTLET VENT AIR INLET WATER INLET RATING PLATE Indoor 150 MBH CONDENSATE TRAP OUTLET For piping dimensions/ (Trap is built-in) locations for all Indoor units, See Table 1 on page 10 GAS CONNECTION AIR INLET WATER OUTLET WATER INLET...
  • Page 13 Page 9 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM EXHAUST VENT RATING PLATE AIR INLET FILTER BOX WATER OUTLET Outdoor 150 MBH WATER INLET CONDENSATE TRAP OUTLET (Trap is built-in) For piping dimensions/ CONNECTION locations for all outdoor units, See Table 2 on page 12 PRV must be added to this pipe during installation.

  • Page 14: F Dimensions, Indoor Models

    Page 10 LAARS Heating Systems Dimensions, Indoor Models Size in cm 13¼ 34 5¼ 14 18¼ 46 3¼ 8 10¾ 28 7½ 19 14¼ 36 19½ 49 7½ 19 15¼ 39 13 33 199/210 20½ 52 5¼ 14 18¼ 46 3¼...
  • Page 15 Page 11 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM All Indoor Units have a very (22) similiar component design with piping dimensions/locations that increase as the unit size increases. Water and gas piping is always on the left side of the unit.

  • Page 16: G Dimensions, Outdoor Models

    Page 12 LAARS Heating Systems 1.G Dimensions, Outdoor Models SIZE 6-1/4" 16 11" 13" 17-1/4" 43.8 23-1/2" 60 18" 45.7 27" 23-1/2" 60 5-1/4" 13 6-1/4" 16 11" 13" 17-1/4" 43.8 23-1/2" 60 18" 45.7 27" 24-1/2" 60 5-1/4" 13 199 / 210 6"...
  • Page 17 Page 13 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Ø L (Length) T (Total Length) VENT SIZE 27" 23-1/2" 60 5-1/4" 13 6-1/4" 16 11" 20" 13" 25-1/2" 65 17-1/4" 43.8 23-1/2" 60 18" 45.7 27" 23-1/2" 60 5-1/4"...

  • Page 18: H The Installation Kit

    Page 14 LAARS Heating Systems 1.H The Installation Kit ( installation parts box The Indoor models are shipped in a single crate with the Installation Kit (cardboard box). Check the contents of the Installation Kit with the items listed in Figure 10 and Figure 11. Additional parts may be packed inside the unit.
  • Page 19 Page 15 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM The OUTDOOR Model Installation Kits, in addition to what is shown in Figure 10 and Figure 11, will include: Vent Pipe Extender, Pipe Adapter, Bird Screen, PRV, Some Class IV venting NPT Pipe Tee components are not included with units shipped to Canada.

  • Page 20: A General Information

    Page 16 LAARS Heating Systems SECTION 2 NOTE: When located on the same wall, the LOCATING THE UNIT combustion air intake terminal must be installed a minimum of 12” below the exhaust terminal. 2.A General Information Models 399-850 also require a minimum horizontal distance from intake to exhaust terminal of 36”.

  • Page 21: Venting And Combustion Air 3.A General Venting

    Page 17 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM SECTION 3 VENTING AND COMBUSTION AIR 3.A General Venting This product requires a special venting system. Refer to Do not mix venting suppliers and models in venting venting supplier’s instructions for complete parts list and systems.
  • Page 22 Page 18 LAARS Heating Systems with method 1 or 2, which follow. Where ducts are used, each opening shall have a minimum free area of not they shall be of the same cross-sectional area as the less than 1 square inch per 2000 Btu/hr (1100 square free area of the openings to which they connect.

  • Page 23: C Venting

    Page 19 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Other methods of introducing combustion and ventilation air are acceptable, providing they conform to the WARNING requirements in the applicable codes listed above. Failure to use polypropylene CPVC or stainless steel In Canada, consult local building and safety codes or, in venting for the first 20”...
  • Page 24 Page 20 LAARS Heating Systems INSTALLATION STANDARDS MATERIAL UNITED STATES CANADA Stainless Steel UL 1738 Venting must be ULC-S636 certified for use as PVC, sch 40 ANSI/ASTM D1785 venting material. The venting material class must be CPVC, sch 40 ANSI/ASTM F441 chosen based upon the maximum flue gas temperature Polypropylene ULC-S636...

  • Page 25: D Locating Vent & Combustion Air Terminals

    Page 21 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Locate the vent terminal so that it cannot be 2 feet of the flue connection. There is no flue gas sampling port internal to the unit, so one must be blocked by snow.
  • Page 26 Page 22 LAARS Heating Systems determine it should be higher, depending upon local conditions. For concentric vent, follow instructions included with vent kit. Multiple vent kits should be installed such that the horizontal distance between the outlet group and the inlet group is 36” (90cm). (Figure 21.) The vent outlet for models 199-285 must be no lower than the center of the air inlet, and must be at least 12”...
  • Page 27 Page 23 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM *When vent terminal is less than 10 feet (3m) horizontally from a forced air inlet, the terminal must be at least 3 feet (0.9m) above the air inlet. (US only) U.S.
  • Page 28 Page 24 LAARS Heating Systems 150-285 Figure 21. Minimum Venting Distance 4. Inspection The state or local gas inspector of the side-wall horizontally vented gas fueled appliance shall not approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR 5.08(2)(a) 1-4.

  • Page 29: E Common Vent Test

    Page 25 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Common Vent Test REMARQUE : Lorsqu’une chaudière existante est supprimée d’un système de ventilation commun, le NOTE: This section does not describe a method for système de ventilation commun est susceptible d’être common venting these high efficiency condensing units.

  • Page 30: Gas Supply And Piping

    Page 26 LAARS Heating Systems SECTION 4 GAS SUPPLY AND PIPING NATURAL GAS REQUIRED CU FT / HR. SIZE TO SIZE PIPING: All Installations must conform to the National Fuel Measure linear distance from meter outlet to last Gas Code ANSI Z223.1/NFPA54, and/or local codes. boiler.

  • Page 31: Pump Requirements

    Page 27 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM SECTION 5 PUMP REQUIREMENTS 5.A Boiler Flow and Head Requirements - Boiler TEMPERATURE RISE IN °F 20°F 25°F 30°F 35°F 40°F FLOW H/L FLOW H/L FLOW H/L FLOW H/L FLOW H/L SIZE GPM 150 14.3 28.5...

  • Page 32: Boiler System Piping: Hot Supply Connections

    Page 28 LAARS Heating Systems SECTION 6 WATER CONNECTIONS - Part A Section 6 is divided into two parts. Section 6A covers Boiler units designed for hydronic heating. Section 6B covers Heater models, This unit’s efficiency is higher with lower return which are designed exclusively for “volume water temperatures.

  • Page 33: Condensate Drain

    Page 29 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM 6.A.3 Condensate Drain it expands which may result in bursting of pipes, or A condensate drain trap is built into the unit. damage to the boiler, which could result in leaking or No additional or secondary trap is required.
  • Page 34 Page 30 LAARS Heating Systems Figure 22. Hydronic Piping — Single Boiler, Zoning with Circulators...
  • Page 35 Page 31 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Figure 23. Hydronic Piping — Single Boiler, Low Temp Radiant Space Heating Using Low Loss Header and Zone Valves...
  • Page 36 Page 32 LAARS Heating Systems Figure 24. Hydronic Piping — Multiple Boilers, Zoning with Circulators Figure 25. Hydronic Piping — Multiple Boilers with Indirect DHW Tank Piped from System Loop...
  • Page 37 Page 33 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Figure 26. Hydronic Piping — Multiple Boilers, Reverse Return, Multi-Temp Zones, Zoning with Circulators...
  • Page 38 Page 34 LAARS Heating Systems Figure 27. Hydronic Piping — Heating Zones with Indirect DHW Tank Piped with Zone Pumps The indirect DHW tank is piped directly off of the boiler. The boiler pump must shut down during DHW operation.
  • Page 39 Page 35 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Figure 28. Hydronic Piping, Multiple Boilers with Indirect DHW Off of One Boiler The boiler pump must shut down during DHW operation.

  • Page 40: Section 6B

    Page 36 LAARS Heating Systems SECTION 6 WATER CONNECTIONS - Part B or to the inlet of the boiler as shown in Figure 29 through Figure Install back flow preventers and shut offs Section 6 is divided into two parts. Section where needed or required by code.

  • Page 41: Heater Suggested Piping Schematics

    Page 37 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM WARNING: This drawing shows suggested piping configuration and valving. Check with local codes and ordinances for additional requirements. NOTES: 1. Optional CWMU & Recirc. line location. 2. Locate Heater DHW sensor or remote aquastat well in lower 1/3 of tank.
  • Page 42 Page 38 LAARS Heating Systems NOTES: 1. Optional CWMU & Recirc. line location. 2. Locate Heater DHW sensor or remote aquastat well in lower 1/3 of tank. 3. Back flow preventer may be required - check local codes. 4. Thermal expansion tank may be required - check local codes.

  • Page 43: A Installation Warnings

    Page 39 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM SECTION 7 7.B Main Power Connections INSTALLATION AND WIRING Connect a 15A fused, 120-volt supply to the main power switch. (The hot leg is connected directly to the switch.) 7.A Installation Warnings The neutral leg is connected directly to the white wire.
  • Page 44 Page 40 LAARS Heating Systems LAARS Heating Systems Page 38 Figure 33. Power & Control Panel Layout All water heating units are shipped from the factory with a resistor (jumper) between the outdoor sensor terminals (terminals 1 and 2 on TB7). If this resistor is removed, the water heater will not be able to heat water above 140°F.

  • Page 45: C Hydronic Heating Using External Mod

    Page 41 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM 7.C Hydronic Heating Using External Modulation Control About External Control - When the unit is used for hydronic heating with external modulation control, a call for heat must be supplied to the “T-T or Interlock”...

  • Page 46: E Lead Lag Connections

    Page 42 LAARS Heating Systems Lead Lag Connections Lead Boiler These units can be connected in a Lead Lag series up to a total of 8 controllers. One as the Lead control and 7 more as the following controllers. See Figure 35. For general info and menu set-up for Lead Lag using your Touchscreen, See Section 8, page 58 ‘About Lead Lag’.

  • Page 47: F Building Automation Systems Connections

    Page 43 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Following Boiler COM2 COM2 TO CASCADING TO CASCADING UNITS 3 THRU 8 UNITS 3 THRU 8 Building Automation System Connections These units can be controlled and monitored through the included Modbus ports.

  • Page 48: G System Wiring Diagram

    Page 44 LAARS Heating Systems 7.G System Wiring Diagram OPTIONAL SWITCH USED ON SOME MODELS. IF SWITCH IS NOT INSTALLED IN TO J4-10 THIS LOCATION. THE TERMINAL JUMPER VALVE SHOULD BE IN PLACE OR/WH COMMON PRESSURE SWITCH "HOT" TO TB1 PIN2 GY/R GY/BL TO TB2 PIN2...
  • Page 49 Page 45 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM DISPLAY TOUCH-SCREEN COM 2 COM 1 OPTIONAL SWITCH USED ON SOME MODELS. IF SWITCH BL/GN TO TB3-1 IS NOT INSTALLED IN TO TB4-1 THIS LOCATION. THE Y/GN PRESSURE TERMINAL JUMPER SWITCH SHOULD BE IN PLACE...

  • Page 50: H Ladder Diagram

    Page 46 LAARS Heating Systems 7.H Ladder Diagram Figure 37. Ladder Diagram...

  • Page 51: Using The Touch Screen

    Page 47 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM SECTION 8 USING THE TOUCH SCREEN The home screen shows a picture of the unit’s controller. The color of the controller depends on the status, as shown below. Color Status Control...

  • Page 52: C Login (Required For Some Parameters)

    Page 48 LAARS Heating Systems Screen Menu Icons to go through an additional “verification” process. For more information, see the section on “Configuration.”) When a password is necessary, the system will present the keyboard screen. See Menu 3. There are several icons at the top of the Touch Screen Menus (and most of the other screens) that will help you move around the system: Home...

  • Page 53: D Verification Process For Safety-Related Parameters

    Page 49 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM If you make a change in any group that could characters for your password. affect the safe operation of the unit, the control When changing a numerical value, the system system will ask you to “verify”...

  • Page 54: E Checking Individual Parameters

    Page 50 LAARS Heating Systems Checking Individual Parameters From the ‘Home’ screen (Menu 9), press the icon for the controller. Menu 7. Safety Parameter Confirmation For each group, check the list carefully. Press Yes if all of the parameters in the group have been entered correctly.

  • Page 55: F Setting The Date And Time

    Page 51 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Setting the Date and Time on the System Display The display includes an internal clock, which keeps track of the date and time. This setting is important, because log entries for Lockouts and Alerts include time listings.

  • Page 56: G The Configuration Menu

    Page 52 LAARS Heating Systems 8.G The Configuration Menu is the gateway to the parameters that the factory, the installer, or the end user will need in order to setup, service, maintain, or adjust the unit. 8.7.1 There are eighteen (18) items in the Configuration 8.7.2 Menu that can be viewed.

  • Page 57: The Configuration Sub-Menus (All 18)

    Page 53 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM The Configuration Sub-Menus ( 18 ) 1 __ 18 8.G. 8.G.2.b Setting Up 4-20 mA Setpoint The Central Heat Configuration Menu ( ) has three Some of these configurations will require a Login first. sub-menus and each of them can be reached by See Menu 3 on page 48 scrolling left or right thru the arrows on the left and...

  • Page 58: Outdoor Reset Configuration

    Page 54 LAARS Heating Systems 8.G.3 Outdoor Reset Configuration Choose S2 (J8-6) 4-20 mA, then press OK At this sub-menu, confirm that Central Heat is Enabled. Next, press onto the Maximum Outdoor Temperature, Minimum Outdoor Temperature, and Low Water Then scroll over to the Modulation sub-menu and Temperature to get to each and adjusting their setpoints in click onto Modulation rate source.

  • Page 59: Demand Priority Configuration

    Page 55 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM 8.G.6 Demand Priority Configuration fed by 120V (violet wire) internally from the main power feed. The System and DHW contacts are dry contacts. Appropriate voltage must be supplied to the System and DHW pumps for proper operation.

  • Page 60: Statistics Configuration

    Page 56 LAARS Heating Systems 8.G.9 Statistics Configuration The statistics configuration sub-menu allows the installer to view Burner Cycles, Burner Run Time, DHW Pump Cycles, Boiler Pump Cycles, and System Pump Cycles. 8.G.13 Frost Protection This sub-menu is ‘Read-Only’ 8.G.10 High Limits Frost protection will assist in keeping the unit from freezing when the unit is not able to fire, but is still able to run the pumps.

  • Page 61: Fan Configuration

    Page 57 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM 8.G.15 Fan Configuration To increase/decrease the speed at which the fan control loop reacts to a decrease in fan speed, adjust the Fan gain down parameter. Similarly, to increase/decrease the speed at which the fan control loop reacts to an increase in fan speed, adjust the Fan gain up parameter.

  • Page 62: About Lead Lag

    Page 58 LAARS Heating Systems About Lead Lag Operation Caution You can cascade up to eight You should set the Modbus addresses before (150 - 850 MBH) boilers or water heaters. you connect the Modbus wiring. If the wiring is attached before the Modbus addresses on For wiring connections to Lead Lag, the controls are changed, there will be multiple see Figure 35 on page 42...
  • Page 63 Page 59 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Touch Screen Lead Lag Addr Addr Addr Addr Addr Addr Addr Addr Master Boiler 1 Boiler 2 Boiler 3 Boiler 4 Boiler 5 Boiler 6 Boiler 7 Boiler 8 Figure 42.

  • Page 64: Lead Lag Follower Configuration

    Page 60 LAARS Heating Systems 8.G.17 Lead Lag Follower Configuration Note: The system sensor and outdoor sensor will need to be wired to the Master boiler only. The input from these sensors is used by the Master control to control the modulation rate of all the operating boilers it is connected to.
  • Page 65 Page 61 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM 8.G.17 Lead Lag Follower Config (continued) Return to the configuration menu by pressing the Then you will need to confirm that the Follower Enabled. Back arrow. Next, you will need to confirm that the configuration is Disabled.

  • Page 66: Lead Lag Leader Configuration

    Page 62 LAARS Heating Systems 8.G.18 Lead Lag Leader Configuration Wiring Connections for Lead Lag - The controller in each boiler includes two wiring terminals for the Modbus system, labeled “MB1” and “MB2.” MB1 has the wiring connections to the User Interface display on each unit, and MB2 is used to communicate with the other boilers in the Lead Lag system.
  • Page 67 Page 63 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM 8.G.18 Lead Lag Leader Config (continued) With the Master Control now Enable, press the setting From the ‘Warm Weather Shutdown’ screen, adjust the box labeled ‘CH setpoint’. Here you can adjust the setpoint.
  • Page 68 Page 64 LAARS Heating Systems 8.G.18 Lead Lag Leader Config (continued) Note: In the Lead Lag Follower Sub-Menu, Identify Press ‘Disabled’’ each control (including the Lead Lag Master) as a Follower by turning on ‘Follower Enable. From the Status Summary Screen, press the ‘Configure’...

  • Page 69: H Configure For A Building Automation System

    Page 65 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Configure for a Building Automation System These units can be controlled and monitored through the included Modbus ports. If communication protocols are desired, manufacturer offers the Gateway Control to allow BACnet, LON, and other communications protocols.

  • Page 70: I Combustion Setup

    Page 66 LAARS Heating Systems 8.I Combustion Setup In this section, we will explain how to adjust the gas valve so the unit will run efficiently at both the High Fire and Low Fire conditions. Required tools: Screwdrivers, Torx bits, Allen Wrench Set, Combustion Analyzer WARNING Improper adjustment may lead to poor combustion...
  • Page 71 Page 67 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM 10. Press ‘Minimum Modulation’ Confirm that the boiler is running and then press ‘Start Test’ 11. Press ‘Start Test’. You will have 5 minutes to adjust Low-Fire CO2. Press ‘Stop Test’ when done. 12.

  • Page 72: J Adjusting Co2

    Page 68 LAARS Heating Systems 8.J Adjusting CO These units use 3 different gas valves depending on the the size of the model. All of them have a Hi-Fire and Low-Fire adjustment. See page 68 for models 150-285, See page 69 for models 399-500, and See page 70 for models 600-850.
  • Page 73 Page 69 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM The Gas Valve in the 399 and 500 is at the front of the unit and can be reached after the front panel is pulled forward and then off. Always be patient with your combustion analyzer when making adjustments to the valve at both Hi-Fire and Low-Fire.
  • Page 74 Inlet gas pressure High re CO adjustment (under cap) Page 70 LAARS Heating Systems pressure The Gas Valve in the 600 is at the front of Low re CO the unit and can be reached after the front adjustment panel is pulled forward and then off. Outlet gas pressure 750, 850...

  • Page 75: First Start Up And Adjustment 9.A Filling The Boiler System

    Page 71 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM SECTION 9 - FIRST START UP AND 12. Prime the condensate trap with water. (This is not ADJUSTMENT required for Boiler 600, 750, and 850 units.) 13. Refer to local codes and the make-up water valve 9.A Filling the Boiler System manufacturer’s instructions as to whether the Ensure the system is fully connected.

  • Page 76: C Shutting Down The Neotherm Unit

    Page 72 LAARS Heating Systems 9.C Shutting Down the Unit Observe all warnings on the Operating Instructions label and turn on the gas and main Turn off the main electrical disconnect switch. electrical power (circuit breaker) to the unit. Close all manual gas valves. If the unit has the optional gas pressure switches, If you think the unit might freeze, drain it.

  • Page 77: Maintenance

    Page 73 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM SECTION 10 Caution MAINTENANCE Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and danger- WARNING ous operation. Verify proper operation after servicing. Disconnect all power to the appliance before attempting any service.
  • Page 78 Page 74 LAARS Heating Systems gas supply line. Remove the front door of the boiler to the factory for proper trouble shooting practices prior to gain access to the gas valve and Venturi. Disconnect replacing the control. If control replacement is required, the four flange bolts connecting the gas manifold pipe turn off all power to the appliance and shut off all manual to the gas valve.
  • Page 79 Page 75 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM of a ground rod and a spark rod (See Figure 47). To Blower remove the ignitor assembly, shut off the 120 Volt The combustion air blower is a high-pressure centrifugal power supply to the appliance.

  • Page 80: C Battery Back Up For Date And Time

    Page 76 LAARS Heating Systems size 600 models will require the gas valve to be Optional Gas Pressure Switches removed in order to remove the burner door. To The high and low gas pressure switches are 24V do this, remove the wiring connections from the manual reset switches that act to cut power to the gas gas valve.

  • Page 81: D Gas Conversion

    Page 77 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM 10.D Gas Conversion These units can easily be converted from natural to propane gas or from propane to natural gas in the field. Some units require the addition of a gas orifice along with proper gas valve adjustment.

  • Page 82: Troubleshooting

    Page 78 LAARS Heating Systems Section 11 TROUBLESHOOTING Lockout will appear in an orange bar across the bottom of the screen. If you tap the orange bar, 11.A Lockouts, Holds, and Alerts the system will present more information about The control system responds to three kinds of the Lockout.
  • Page 83 Page 79 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM 3. Press the long Yellow Alert or Yellow Lockout Bar If you choose ‘LOCKOUTS’, this menu will appear. (the long bar will be a long Grey ‘History’ Bar if not currently in Alert or Lockout).

  • Page 84: B Troubleshooting Table

    Page 80 LAARS Heating Systems 11.B Troubleshooting Table This table includes a listing of the fault codes that may be displayed. Some of these can be corrected by changing a parameter, while other conditions are more complicated, and will require a service technician. The fi...
  • Page 85 Page 81 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Code Description Lockout Procedure or Hold Internal fault: Safety relay test failed due to safety relay OFF Internal fault: Safety relay test failed due to Internal fault safety relay not OFF 1.
  • Page 86 Page 82 LAARS Heating Systems Code Description Lockout Procedure or Hold 24 VAC voltage low/high 1. Check the module and display connections. 2. Check the module power supply and make sure that frequency, voltage and VA meet the specifi cations. Modulation fault Internal sub-system fault.
  • Page 87 Page 83 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Code Description Lockout Procedure or Hold PII (Pre-Ignition Interlock) OFF H or L 1. Check wiring and correct any faults. 2. Check Preignition Interlock switches to assure proper functioning. 3.
  • Page 88 Page 84 LAARS Heating Systems Code Description Lockout Procedure or Hold Outlet sensor fault 1. Check wiring and correct any possible errors. 2. Replace the Outlet sensor. 3. If previous steps are correct and fault persists, replace the module. DHW (Domestic Hot Water) 1.
  • Page 89 Page 85 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Code Description Lockout Procedure or Hold Flame lost in MFEP 1. Check main valve wiring and operation - correct any errors. 2. Check the fuel supply. Flame lost early in run 3.
  • Page 90 Page 86 LAARS Heating Systems Code Description Lockout Procedure or Hold Purge fan switch OFF H or L 1. Purge fan switch is off when it should be on. 2. Check wiring and correct any errors. 3. Inspect the Purge Fan switch J6 terminal 3 and its connections.
  • Page 91 Page 87 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM...

  • Page 92: C Diagnostic Tests And Input/Output Indicators

    Page 88 LAARS Heating Systems 11.C Diagnostic Tests and Input/ Output Indicators Two kinds of screens are grouped together in this section: • Detailed indications of the input and output signals • Diagnostic tests of the pumps and burner modulation Note that these functions apply to just one selected controller.

  • Page 93: D Lead Lag Follower Diagnostics

    Page 89 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM 11.D Lead/Lag Slave Diagnostics The control system includes a diagnostic screen that lists some information on the Lead/Lag slaves in the system. See Menu 13 Menu 15. Analysis Setup Screen To use this function, select the parameter you want to track from the pull-down list.

  • Page 94: H Operating Sequence

    Page 90 LAARS Heating Systems 11.H Operating Sequence Select one of the controllers listed on the right side When there is a call for heat, the unit will close pump of the screen. Press one of the buttons below the contacts to energize the customer supplied relay/ contactor to start water fl...

  • Page 95: Replacement Parts

    Page 91 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Section 12 - REPLACEMENT PARTS Use only genuine replacement parts. 12.A General Information To order or purchase parts, contact your nearest manufacturer’s dealer or distributor. If they cannot supply you with what you need, contact Customer Service.
  • Page 96 Page 92 LAARS Heating Systems SIZE SIZE SIZE SIZE SIZE SIZE SIZE SIZE ITEM DESCRIPTION BOILER 150 BOILER 210 BOILER 285 BOILER 399 BOILER 500 BOILER 600 BOILER 750 BOILER 850 HEATER 150 HEATER 199 HEATER 285 HEATER 399 HEATER 500 HEATER 600 HEATER 750 HEATER 850...

  • Page 97: Parts Illustrations

    Page 93 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM SIZE SIZE SIZE SIZE SIZE SIZE SIZE SIZE ITEM DESCRIPTION BOILER 150 BOILER 210 BOILER 285 BOILER 399 BOILER 500 BOILER 600 BOILER 750 BOILER 850 HEATER 150 HEATER 199 HEATER 285 HEATER 399...
  • Page 98 Page 94 LAARS Heating Systems Parts Illustration 2. Internal Components, Parts Illustration 3. Internal Components, Sizes 150–210 Sizes 285–600...
  • Page 99 Page 95 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Parts Illustration 4. Internal Components, Sizes 750-850...
  • Page 100 Page 96 LAARS Heating Systems Sizes 150-285 Parts Illustration 5. Gas Train Components, Sizes 150-500...
  • Page 101 Page 97 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Parts Illustration 6. Gas Train Components, Sizes 600-850...
  • Page 102 Page 98 LAARS Heating Systems Sizes 285 - Parts Illustration 7. Heat Exchanger Components...
  • Page 103 Page 99 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM (Front) Touchscreen (Back) Battery ( CR2032 ) Parts Illustration 8. Electrical Components...
  • Page 104 Commercial Boilers and Water Heaters, 150 to 850 MBTU/h HERM Parts Illustration 9. Outdoor Pump All Manuals (Install & Operate, Start Up, and Service Manuals) can be downloaded at Top Panel (rain shield) Pump www.laars.com Flange Kit (bag) Side Panels For LAARS Product and Service VIDEOS Power Harness...

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