Laars MagnaTherm HTD Series Installation And Operation Instructions Manual
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Laars MagnaTherm HTD Series Installation And Operation Instructions 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
followedexactly,afireorexplosionmayresult
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 unit.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any unit.
• 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.
Installation and Operation Instructions for
MODULATING AND CONDENSING
20:1 Turndown.
Boiler
with VARI-PRIME
Model MGH1600
1,600 MBTU/h
Model MGH2000
1,999 MBTU/h
Model MGH2500
2,499 MBTU/h
Model MGH3000
3,000 MBTU/h
Model MGH3500
3,500 MBTU/h
Model MGH4000
4,000 MBTU/h
WARNING
Laars Linc
Water Heater
®
______________
Model MGV1600
1,600 MBTU/h
Model MGV2000
1,999 MBTU/h
Model MGV2500
2,499 MBTU/h
Model MGV3000
3,000 MBTU/h
Model MGV3500
3,500 MBTU/h
Model MGV4000
4,000 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 êtes.
• 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 service 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 1422
HTD
®

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  • Page 1 Installation and Operation Instructions Document 1422 Installation and Operation Instructions for MODULATING AND CONDENSING ® 20:1 Turndown. Laars Linc Boiler Water Heater ® with VARI-PRIME ______________ Model MGV1600 Model MGH1600 1,600 MBTU/h 1,600 MBTU/h Model MGV2000 Model MGH2000 1,999 MBTU/h...

  • Page 2: Table Of Contents

    LAARS Heating Systems TABLE OF CONTENTS SECTION 1 General Information SECTION 5 Piping Introduction........... 1 Boiler Water Piping ......24 Model Identification ......1 5.A.1 Boiler Water Connections ....24 Warranty ..........1 5.A.2 Cold Water Make-Up ......24 Safety Notes ......... 2 5.A.3...
  • Page 3 Section 8 (continued) 8.C.5 Anti-Short Cycle ........ 68 8.E.8 HMI Model OEM only...... 100 8.C.6 Time & Date ........68 8.E.9 BIC Model OEM only ....... 100 8.D Configuration ......69 8.E.10 Both Model. OEM only....100 8.E.11 About About the Firmware version. 100 8.D.1 CH (Central Heat) .......
  • Page 4 LAARS Heating Systems...

  • Page 5: Section 1 General Information

    This manual includes information which will help you LAARS Heating Systems MagnaTherm HTD boilers and volume water heaters are covered by a limited warranty. to install, operate, and maintain the Laars Heating Systems MagnaTherm HTD. Please read this manual The owner should complete the warranty registration at completely before proceeding with the installation.

  • Page 6: D Safety Notes

    LAARS Heating Systems Page 2 Safety Notes Safety Notes are used thoughout this manual to bring attention to the presence of hazards with various risk levels and to off er important information concering the life of this product. There are 3 basic types.
  • Page 7 Page 3 WARNING NOTE: All installations must be made in accordance with 1) American National Standard Z223.1/NFPA54-Latest Electrical Shock Hazard Edition “National Fuel Gas Code” or Electrical shock can cause severe injury, death or 2) CSA B149.1 “Natural Gas and Propane Installation property damage.

  • Page 8: E Unit Overview

    LAARS Heating Systems Page 4 Unit Overview Blower Pressure Transmitters Spark Generator On all models, the Control Panel hinges forward for easy access to wiring and to the heat exchanger. Control Panel Heat Exchanger Gas Supply Valve Air Intake and Filter...

  • Page 9: F Gas Train Components

    Page 5 Gas Train Components The Gas Train for all sizes has the same layout. These two views of the gas train show the linear path of the gas around the front of the unit to the Air Mixing Valve and then into the blower. Pilot Gas Valve Gas Inlet...

  • Page 10: G Venting Dimensions & Sizing

    LAARS Heating Systems Page 6 Venting 1.G Venting Dimensions & Sizing nformation Maximum Maximum Typical Vent / Air Category IV Category IV Model Air Pipe Size Ducted Air Pipe Category II Vent Connector Size Vent Pipe Size Vent Pipe Length...
  • Page 11 Refer to section 1.G for vent and air pipe sizes. Flanges, Contact Knock-down Height is the height of the boiler after Factory the blower and gastrain have been removed. This is a design feature to make installations easier. See https://www.laars.com/videos ALL Sizes REAR REAR Figure 1. Dimensions VIEW...

  • Page 12: I Unpacking And The Install Kit

    LAARS Heating Systems Page 8 Unpacking and the Install Kit Locating the Unit This unit is shipped in a single crate. Carefully This unit may be installed indoors or outdoors. If installing disassemble the crate and inspect the unit for any outdoors in a location that may experience freezing damage during shipping.

  • Page 13: K Clearances

    Page 9 1.K Clearances earances Clearances See Table 2 for Suggested Top Service Clearances Suggested Suggested Clearance to Clearance to Service Service Suggested Top Service Clearance by Model Suggested Top Service Clearance by Model Combustibles Combustibles Clearance Clearance inches inches inches inches 1600/2000...

  • Page 14: Section 2 Venting And Combustion Air

    LAARS Heating Systems Page 10 SECTION 2 Venting and Combustion Air 2.A General Venting Information 2.B Vent and Air Pipe Material This unit requires a special venting system. Refer to WARNING venting supplier’s instructions for complete parts list and Selection of improper vent materials for installations method of installation.

  • Page 15: B.1.B Exhaust Vent Terminal

    Page 11 a tee with the branch connection sized to allow for insertion of a flue gas analyzer probe. The branch connection must be resealable with a cap or other means to ensure the vent system remains sealed. (See Figure 4) Consideration must be given to the placement and orientation of the flue gas sampling port to ensure that condensate is free to flow back into the unit and not...

  • Page 16: C Vent And Air Pipe Sizing

    CA012201 CA012202 CA012203 CA012203 Screen for vertical galvanized air pipe D2012204 D2012201 D2012201 D2012202 D2012203 D2012203 LAARS Heating Systems Page 12 Screen for vertical PVC air pipe CA012404 CA012401 CA012401 CA012402 CA012403 CA012403 Screen for vertical polypropylene air pipe CA012604...

  • Page 17: Category Lv Vent Sizes

    Page 13 2.C.2 Category II Vent Sizes 2.C.1 Category lV Vent Sizes Non-positive pressure vent systems are generally Positive pressure vent systems may be either vertically-terminated. Table 9 gives guidelines for vent horizontally or vertically vented. The vent pipe and air pipe sizes, but the draft must be measured to used must be suitable for positive pressure, per the ensure that it remains between -0.1”w.c.

  • Page 18: Common Vent Test

    LAARS Heating Systems Page 14 2.C.4 Common Vent Test Au moment du retrait d’une chaudiére existante, les NOTE: This section does not describe a method for mesures suivantes doivent être prises pour chaque common venting this unit. It describes what must be appareil toujurs raccordé...

  • Page 19: Combustion Air

    Page 15 2.C.5 Combustion Air 2.C.5.a Combustion Air From Room Boilers and water heaters must have provisions for In the United States, the most common requirements combustion and ventilation air in accordance with the specify that the space shall communicate with the applicable requirements for Combustion Air Supply and outdoors in accordance with Method 1 or 2.

  • Page 20: C.5.B Ducted Combustion Air

    LAARS Heating Systems Page 16 2.C.5.b Ducted Combustion Air 2.D Locating the Vent and Combustion Air Terminals The combustion air can be taken through the wall, or through the roof. The manufacturer offers accessories to use with ducted air systems, as shown in Table 8.
  • Page 21 Page 17 *When vent terminal is less than 10 feet (3 m) horizontally from a forced air inlet, the terminal must be at least 3 feet (0.9 m) above the air inlet. (US only) U.S. Installations (see note 1) Canadian Installations (see note 2) A= Clearance above grade, veranda, porch, 12 inches (30 cm) 12 inches (30 cm)

  • Page 22: Side-Wall Combustion Air Terminal

    LAARS Heating Systems Page 18 Multiple Vents 2” Min. (Typ) Window OUTLET Multiple Air Intakes 2” Min. (Typ) 36” 12” 84” INLET Terminals must be placed such that they are a Minimum of 12” above the Above expected snow line 12”...

  • Page 23: E Outdoor Installation

    Page 19 (Place in section 3.5) Model 1600 Model 2000 Model 2500 Model 3000 Model 3500 Model 4000 Air intake screen for unit placed outdoors CA0011904 CA011901 CA011901 CA011902 CA0011903 CA0011903 Vent terminal for unit placed outdoors CA011804 CA011801 CA011801 CA011802 CA011803 CA011803...

  • Page 24: Section 3 Gas Supply And Piping

    LAARS Heating Systems Page 20 SECTION 3 Gas supply and Piping 3.A Gas Supply and Piping All Installations must conform to the National Fuel Gas Code ANSI Z223.1/NFPA54, and/or local codes. In Canada, the installation must conform to the latest...

  • Page 25: B Gas Pipe Sizing

    2,760 4,400 7,780 15,900 2,220 3,530 6,250 12,700 1,900 3,020 5,350 Page 21 10,900 1,680 2,680 4,740 9,660 1,520 2,430 4,290 8,760 3.B Gas Pipe Sizing 1,400 2,230 3,950 8,050 1,300 2,080 3,670 7,490 The following are gas line sizing examples from the National Fuel Gas Code. Size your gas lines properly, 1,220 1,950 3,450...

  • Page 26: Section 4 Water Flow & Headloss Data

    The water flow and headloss data shown in Table 4.B. Boiler Water Flow and Headloss Data closed systems, so Laars bases the water flow data on generally used in closed systems, so Laars bases turndown, meaning it modulates from 5% to 100% of (difference between boiler inlet and outlet 15 is based on full input of the boiler.

  • Page 27: C Water Heater Water Flow And Headloss Data

    Page 23 Table 16. Minimum Boiler Water Flow 4.C. Water Heater Water Flow and Table 17 shows water flow and headloss based on 4.C Water Heater Water Flow and Headloss Data the hardness of the system's water. Temperature Headloss Data rise is shown for information and Water flow and headloss for water heaters is based Water flow and headloss for water heaters is based on...

  • Page 28: Section 5 Piping

    LAARS Heating Systems Page 24 SECTION 5 Piping 5.A Boiler Water Piping 5.A.1 Boiler Water Connections 5.A.3 Freeze Protection NOTE: This unit must be installed in a closed This unit may be installed indoors or outdoors. If pressure system with a minimum of 12 psi (82.7 kPa) installing outdoors in a location that may experience static pressure at the boiler.

  • Page 29: Suggested Boiler Piping Schematics

    Page 25 5.A.4 Suggested Boiler Piping Schematics This boiler is a high efficiency appliance. Boiler • Hercules Chemical Company efficiency can be maximized by using piping and • Dow Chemical Company distribution configurations that return the lowest The boiler control offers some assistance with freeze temperature possible to the boiler, while still meeting the protection, as long as the boiler is energized, and able needs of the system.
  • Page 30 LAARS Heating Systems Page 26 Note - This drawing is a schematic representation of a piping style, and is not intended to be used as a working installation drawing. Local code requirements must be met. Low temp. radiant zone Low temp. radiant zone...
  • Page 31 Page 27 Space heating Note - zone circuits This drawing is a schematic representation of a piping style, and is not intended to be used as a working installation drawing. Local code requirements must be met. Low temp. radiant zone Space heating zone circuit Air vent 4 pipe dia.
  • Page 32 LAARS Heating Systems Page 28 Note - High temp. Space heating This drawing is a schematic representation of space heating zone circuit zone circuits a piping style, and is not intended to be used as a working installation drawing. Local code requirements must be met.

  • Page 33: Water Heaters

    Page 29 5.B Water Heaters 5.B.1 Water Quality Water heaters must be installed in water conditions transmit noise through the system resulting from piping of 15 gpg hardness or less, with a pH range of 6.5 to sliding in the hangers. We recommend that padding be 9.5 pH.

  • Page 34: Freeze Protection

    LAARS Heating Systems Page 30 5.B.4 Freeze Protection 5.B.5 Suggested Piping Schematics This heater is a high efficiency appliance. Heater If installing outdoors in a location that may experience efficiency can be maximized by using piping freezing temperatures, precautions must be taken to...
  • Page 35 Page 31 Optional location for EXPANSION COLD WATER SUPPLY TANK BUILDING RETURN Location of pump Check valve Location of pump EXPANSION TANK Check valve BALL VALVE (TYPICAL) NOTE: This drawing shows suggested piping configuration and valving. Check with local codes and ordinances for additional requirements.

  • Page 36: Section 6 Condensate Drain Trap

    A condensate neutralizer is not included with the unit, but is available from Laars as an accessory. If a neutralizer is required, it is helpful to install the boiler or water heater on a raised 4”...

  • Page 37: Condensate Trap Instructions

    Page 33 6.A Condensate Trap Install Instructions 1. The condensate trap (pre-assembled with caps & float). 2. Transparent discharge hose. 3. Hose clamps (2). 4. Hose adapter. 5. The discharge hose 'end adapter'. 6. Mounting bracket (top half). 7. Mounting bracket (bottom half) with the velcro strap. 8.

  • Page 38: Section 7 Electrical Connections

    LAARS Heating Systems Page 34 SECTION 7 Electrical Connections 7.A Installation Warnings CAUTION CAUTION The supply voltage to this unit must not be Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and disconnected, except for service or isolation, or dangerous operation.

  • Page 39: Main Power Connections

    Page 35 7.B Main Power Connections Shown with outside panels removed for full servicing. Hinged control panel swings open for servicing and setup Field Electrical Connections at the Terminal Block on the Control Panel. Junction Box for Main Power Connections Junction Box for Field Connections Black Plastic Flex Conduit...

  • Page 40: Main Power Data

    LAARS Heating Systems Page 36 Size 1600 2000 7.C Main Power Data 208 1Ф 208 1Ф 208 3Ф Voltage 240/220 240/220 18.6 10.1 12.5 Size 1600 2000 208 1Ф 23.3 12.7 208 1Ф 15.6 208 3Ф Voltage 240/220 240/220 10.1 18.6...
  • Page 41 Page 37 LMV Controller Assembly Handset, Display and Low Water Cut-Off Operating Unit. For Certified and Trained Field Techs Only. 12 Volt DC Power Supply Linc Controller Assembly Field Connections Terminal Block O2 Sensor Controller ANALOG ANALOG RUN RELAY ALARM RELAY CASCADE 120 VAC 24 VAC...

  • Page 42: Temperature Sensors

    LAARS Heating Systems Page 38 NOTE: When running the Power and Field Connection wirings between the units (Lead presence of this sensor and initiates a call for heat when Lag, System Sensor, Outdoor Sensor, Building the DHW temperature drops below the DHW set point Automation, etc.), it is helpful to exit and enter the...

  • Page 43: Heat Demands

    Page 39 Figure 22. Jumper locations at the inputs Sensor at an outdoor location that is not affected by false temperature readings such as sunlight or hot for blower speed control, this input provides speed equipment. feedback from the VFD to the controls. Outputs 7.E.4 Heat Demands...

  • Page 44: Rs 485, Cascade

    LAARS Heating Systems Page 40 7.E.7 RS 485 for Cascade (Lead Lag) Cascade - Prior to wiring units for cascade operations, NOTE: A system supply sensor (supplied with each unit) select one unit as the lead boiler/heater. Other units must be installed and connected to the Lead boiler/heater.

  • Page 45: Modbus To Bacnet Memory Map

    Page 41 Modbus to BACnet Memory Map Modbus BACnet BACnet Address Type Map Descriptor Name Data Type Object ID Read/Write Notes Read Inlet Sensor Read Read Outlet Sensor Read Read Flue Sensor Read Read DHW Sensor Read Read System Inlet Sensor Read Read System Outlet Sensor...
  • Page 46 LAARS Heating Systems Page 42 7.F Modbus and BACnet memory displays (continued) Modbus BACnet BACnet Address Type Map Descriptor Name Data Type Object ID Read/Write Notes Read History - Boiler Pump Cycles Read Read History - DHW Pump Cycles Read...
  • Page 47 Page 43 Modbus BACnet BACnet Address Type Map Descriptor Name Data Type Object ID Read/Write Notes 217 = interpurge 241 = Postpurge 245 = Trial for Ignition 250 = Trial for Ignition Main 52=Post Purge Read Boiler Pump Status Read Read Cascade Master Heat Demand Read...

  • Page 48: Wiring Diagrams

    Page 44 LAARS Heating Systems 7.G Wiring Diagrams X3-03 X3-05 X6-03 X4-02 X7-02 X9-04 X5-01 X5-02 WIRING DIAGRAM 1.6 HTD Figure 23. Wiring Diagram, Model 1600...
  • Page 49 Page 45 TB1-6:3 TB1-9:3 BK/O TB1-12:1 O2 Sensor Wiring diagram is located on the inside left front door panel. H2396700 REV -...
  • Page 50 Page 46 LAARS Heating Systems X3-05 X6-03 X4-02 X7-02 X9-04 X5-01 X5-02 X3-03 Figure 24. Wiring Diagram, For Models 2000 and larger...
  • Page 51 Page 47 TB1-6:3 TB1-6:3 TB1-9:3 TB1-9:3 BK/O BK/O TB1-12:1 TB1-12:1 O2 Sensor O2 Sensor Wiring Diagram is located on the inside front door panel.

  • Page 52: High Voltage Wiring Diagrams

    Page 48 LAARS Heating Systems 7.H High Voltage Wiring Diagrams Figure 25. High Voltage Wiring Diagram Model 1600, 120V...
  • Page 53 Page 49 Figure 26. High Voltage Wiring Diagram Model 1600, 208V Single Phase...
  • Page 54 Page 50 LAARS Heating Systems 7.H High Voltage Wiring Diagrams (continued) Figure 27. High Voltage Wiring Diagram Model 1600, 220V / 240V Single Phase...
  • Page 55 Page 51 Figure 28. High Voltage Wiring Diagram Model 2000, 120V...
  • Page 56 Page 52 LAARS Heating Systems 7.H High Voltage Wiring Diagrams (continued) 120V N 120V N 120V H 120V H Figure 29. High Voltage Wiring Diagram Model 2000, 208V Single Phase...
  • Page 57 Page 53 Figure 30. High Voltage Wiring Diagram Model 2000, 220V / 240V Single Phase...
  • Page 58 Page 54 LAARS Heating Systems 7.H High Voltage Wiring Diagrams (continued) 120V N 120V N 120V H 120V H Figure 31. High Voltage Wiring Diagram Model 2000 - 4000 Three Phase...

  • Page 59: Ladder Diagrams

    Page 55 Ladder Diagrams Figure 32. Model 1600 120V Ladder Diagram...
  • Page 60 Page 56 LAARS Heating Systems Ladder Diagrams (continued) Figure 33. Model 1600, 208V, Single Phase, Ladder Diagram...
  • Page 61 Page 57 Figure 34. Model 1600, 220V / 240V Single Phase Ladder Diagram...
  • Page 62 Page 58 LAARS Heating Systems Ladder Diagrams (continued) Figure 35. Model 2000, 120V Ladder Diagram...
  • Page 63 Page 59 Figure 36. Model 2000, 208V, Single Phase, Ladder Diagram...
  • Page 64 Page 60 LAARS Heating Systems Ladder Diagrams (continued) Figure 37. Model 2000, 220V / 240V Single Phase Ladder Diagram...
  • Page 65 Page 61 Figure 38. Three-Phase Ladder Diagram...

  • Page 66: Section 8 Control Operation

    LAARS Heating Systems Page 62 SECTION 8 Control Operation 8.A The Home Screen 8.A.1 Home Screen Active Icons Name Icon Description Security Displays the current lock status icon. Touch the lock icon to lock or unlock the See Section 8.B on page 64 Touchscreen Display.

  • Page 67: Keypad Operations

    Page 63 8.A.2 Keypad Operations NOTE: You can always tell exactly where you have navigated to Navigation Bar. by looking at the icons in the In this example you are in Home/Configure/CentralHeat/CentralHeatOne Shows the current setting of the Parameter. These windows will reflect the allowable ranges of the parameter To delete the current setting before entering in the new value.

  • Page 68: Login To Lock / Unlock The Display

    LAARS Heating Systems Page 64 8.B Login to Lock / Unlock the Display Screen Password Protection: To change configuration or parameters, a password is required. The control system includes three levels of password protection. Touch the 'Current Lock Status' icon at the top of the screen.

  • Page 69: Quick Start

    Q U I C K S T A R T Page 65 8.C Quick Start Quick Start will allow a user to configure the BASIC functionality of the control, without going through all of the parameters that are available. The 6 BASIC functionalites at Quick Start are •...

  • Page 70: Quick Start Ch1 (Central Heat, One)

    Q U I C K S T A R T LAARS Heating Systems Page 66 8.C.1.a CH1 (Central Heat, One) • Enable/Disable – This allows CH1 to be enabled/disabled. The default setting is Enabled. • Set Point – This is the set point temperature.

  • Page 71: Outdoor Reset

    Q U I C K S T A R T Page 67 8.C.3 Outdoor Reset Outdoor reset adjusts a boiler’s setpoint based on outdoor air temperature. This is for boilers only, and is not used for domestic water. To navigate to the Outdoor Quick Start Screen, touch the Outdoor Icon on the Quick Start Screen. The Outdoor Quick Start Screen allows the adjustment of the following parameters: •...

  • Page 72: Anti-Short Cycle

    Q U I C K S T A R T LAARS Heating Systems Page 68 8.C.5 Anti-Short Cycle To navigate to the Anti-Short Cycle Quick Start Screen, touch the Anti-Short Cycle Icon on the Quick Start Screen. The Anti-Short Cycle Quick Start Screen allows adjustment of the following parameter: •...

  • Page 73: D Configuration

    C O N F I G U R A T I O N Page 69 8.D Configuration This area of the controller allows access to all parameters available, based on the access level that is unlocked. To navigate to the Configuration Screen, touch the Configure Icon in the lower left portion of the Home Screen. The Configuration Screen shows all configurable parameters.

  • Page 74: Ch (Central Heat)

    C O N F I G U R A T I O N LAARS Heating Systems Page 70 8.D.1 CH (Central Heat) “CH” stands for “Central Heat.” It is used for space heating demands. On the Configure Screen, touch the CH...

  • Page 75: D.1.A.3 Pid Parameters

    C O N F I G U R A T I O N Page 71 8.D.1.a.1 PID Parameters Note that in most cases, PID parameters will not need to be changed. The PID Parameters Screen allows adjustment to the following parameters: •...

  • Page 76: Outdoor Reset

    C O N F I G U R A T I O N LAARS Heating Systems Page 72 8.D.3 Outdoor Reset Outdoor reset adjusts a boiler’s setpoint based on outdoor air temperature. This is for boilers only, and is not used for domestic water.

  • Page 77: Cascade (Lead / Lag)

    C O N F I G U R A T I O N Page 73 8.D.4 Cascade (All about Lead / Lag) An installation with two or more units may be configured for cascade operation. Up to eight units can be cascaded and controlled together.
  • Page 78 C O N F I G U R A T I O N LAARS Heating Systems Page 74 8.D.4 Cascading (Lead / Lag) -continued Log In Settings Parameter User Installer Default Unit Base Load Drop Load Min On Time Seconds...
  • Page 79 C O N F I G U R A T I O N Page 75 As the load increases: As the load decreases: • Until all units are firing, no unit is requested to exceed • As long as all units are firing – the base load value can be exceeded, as long as all units maintain the same firing the base load value.
  • Page 80 C O N F I G U R A T I O N LAARS Heating Systems Page 76 About Cascading (Lead / Lag) -continued Low demand: The first boiler in sequence ignites and gradually increases firing rate to satify the heat demand.
  • Page 81 eight boilers reach the Base Load Value , all units are allowed to increase firing rate (same at all boilers) up to C O N F I G U R A T I O N Page 77 maximum firing rate. 100% 100% 100%...

  • Page 82: D.4.A Cascade Ch (Central Heat)

    C O N F I G U R A T I O N LAARS Heating Systems Page 78 8.D.4.a Cascade CH To navigate to the Cascade CH Configuration Screen, touch the Cascade Icon on the Configuration Screen, then touch the Cascade CH Icon on the Cascade Configuration Screen.

  • Page 83: D.4.A.1 Cascade Ch Lead Settings

    C O N F I G U R A T I O N Page 79 8.D.4.a.1 Cascade CH Lead Settings To navigate to the Cascade CH Lead Configuration Screen, touch the Cascade Icon on the Configuration Screen, then touch the Cascade CH Icon on the Cascade Configuration Screen, and then touch the Lead Settings Icon on the lead unit.

  • Page 84: D.4.A.1.A Cascade Base / Drop Load

    C O N F I G U R A T I O N LAARS Heating Systems Page 80 8.D.4.a.1.A Base / Drop Load Base Load – Is the firing rate that must be achieved prior to adding another unit to satisfy the heat demand.

  • Page 85: D.4.C Cascade Rotation

    C O N F I G U R A T I O N Page 81 8.D.4.c Rotation To navigate to the Cascade Rotation Screen, touch the Cascade Icon on the Configure Screen, then touch the Rotation Icon on the Cascade Configuration Screen. The Cascade Rotation Screen is a view only screen.

  • Page 86: D.4.D Cascade Redundancy

    C O N F I G U R A T I O N LAARS Heating Systems Page 82 8.D.4.d Redundancy To navigate to the Cascade Redundancy Screen, touch the Cascade Icon on the Configuration Screen, then touch the Redundancy Icon on the Cascade Configuration Screen.

  • Page 87: Pumps

    C O N F I G U R A T I O N Page 83 8.D.6 Pumps The Pump Configuration Screen allows adjustment of the following 7 parameters: • Boiler Pump Control – This parameter provides the ability to set the boiler pump functionality to be: Auto –...

  • Page 88: D.6.A Dhw Recirculation

    C O N F I G U R A T I O N LAARS Heating Systems Page 84 8.D.6.a DHW Recirculation The DHW Recirculation Parameters Screen allows the adjustment of the following parameters: • Enable/Disable – Enables/Disables the DHW Recirculation functionality.

  • Page 89: Manual Firing Rate

    C O N F I G U R A T I O N Page 85 8.D.7 Manual Firing Rate To navigate to the Manual Firing Rate Screen, touch the Manual Firing Rate Icon on the Configuration Screen. The Manual Firing Rate Control Screen allows the adjustment of the following parameters: •...

  • Page 90: D.8.A Delta T Parameters

    C O N F I G U R A T I O N LAARS Heating Systems Page 86 8.D.8.a Delta T Parameters To navigate to the Delta T Parameters Screen, touch the Temp Limits Icon on the Configuration Screen, then touch the Delta T Parameters button on the Temperature Limits Parameters Screen.

  • Page 91: External

    C O N F I G U R A T I O N Page 87 8.D.9 External The External Configuration Screen applies to the 0-10VDC (4-20mA) analog input BAS signal, and allows adjustment of the following parameters: To navigate to the External Configuration Screen, touch the External Icon on the Configuration Screen. •...

  • Page 92: D.9.A External - Remote Set Point

    C O N F I G U R A T I O N LAARS Heating Systems Page 88 8.D.9.a External – Remote Set Point External (0 – 10VDC or 4 – 20mA) • An External heat demand can be initiated by a Building Automation System (BAS) using a 0-10VDC or 4-20mA signal.

  • Page 93: D.9.B External Firing Rate

    C O N F I G U R A T I O N Page 89 8.D.9.b External Firing Rate With External Firing Rate selected, the unit will initiate a heat demand once the analog input signal exceeds the Demand On value. Once the demand is initiated, the analog input signal must be lower than Demand Off to remove the heat demand.

  • Page 94: Miscellaneous Features

    C O N F I G U R A T I O N LAARS Heating Systems Page 90 8.D.11 Miscellaneous Features To navigate to the Miscellaneous Features Screen, touch the Miscellaneous Features Icon on the Configuration Screen. The Miscellaneous Features screen provides navigation for the following items: •...

  • Page 95: D.11.A Demand Priority

    C O N F I G U R A T I O N Page 91 8.D.11.a Demands Priorities To navigate to the Demands Priorities Screen, first go to the Miscellaneous folder. At the Demands Priorities screen select each configured demand and assign a priority number. Remember to always save the new setting with the button.

  • Page 96: D.11.C Warm Weather

    C O N F I G U R A T I O N LAARS Heating Systems Page 92 8.D.11.c Warm Weather To navigate to the Warm Weather Configuration Screen, touch the Miscellaneous Features on the Configuration Screen, then touch the Warm Weather Icon on the Miscellaneous Features screen. The Warm Weather Configuration Screen allows adjustment of the following parameters: •...

  • Page 97: D.11.D Com Port, Bms

    C O N F I G U R A T I O N Page 93 8.D.11.d COM Port, BMS The control has Modbus and BACnet MSTP (RS485) protocols on board, for use with Building Management Systems. Gateways can be used for other communication protocols. To navigate to the COM Port Configuration Screen, touch the Misc Icon on the Configuration Screen, then touch the COM Port Icon on the Misc Configuration Screen.

  • Page 98: D.11.E Temperature Conversion

    C O N F I G U R A T I O N LAARS Heating Systems Page 94 8.D.11.e Temperature Conversion To navigate to the Temperature Conversion Configuration Screen, touch the Temperature Conversion Icon on the Miscellaneous Features screen. The Temperature Conversion Configuration Screen allows adjustment of the following parameter: •...

  • Page 99: D.11.G Trim (O 2 Trim Enable / Disable)

    C O N F I G U R A T I O N Page 95 8.D.11.g Trim (O 2 Trim Enable / Disable) To navigate to the Trim Menu, touch the Trim Icon on the Miscelaneous Menu Screen. This O 2 Trim Menu allows you to •...

  • Page 100: E Service Screens

    S E R V I C E LAARS Heating Systems Page 96 8.E Service Screens To navigate to the Service Screen, touch the Service Icon in the lower left portion of the Home Screen. Available only to the factory or technician qualified at the OEM level.

  • Page 101: Digital I/O ( Input / Output )

    S E R V I C E Page 97 8.E.2 Digital I/O ( Input / Output ) There are two screens associated with the Digital I/O: Digital I/O Screen-Inputs; Digital I/O Screen-Outputs. Navigate to the Digital I/O Screen by touching the Digital I/O Button on the Service Screen. Digital I/O Inputs: The indicator light associated with the input is green when the input is satisfied.

  • Page 102: Analog I/O

    S E R V I C E LAARS Heating Systems Page 98 8.E.3 Analog I/O Navigate to the Analog I/O Screen by touching the Analog I/O Button on the Service Screen. There are two screens associated with the Analog I/O: Analog I/O Inputs; Analog I/O Outputs.

  • Page 103: Screen Settings Timeout

    S E R V I C E Page 99 8.E.4 Screen Settings Timeout Navigate to Screen Settings by touching the Screen Button on the Service Screen. There are two adjustable screen settings: Light Timeout and AutoLock Timeout. • Light Timeout allows the user to adjust the amount of time the touch screen backlight will remain lit after user interaction has ceased.

  • Page 104: Factory Reset

    S E R V I C E LAARS Heating Systems Page 100 8.E.7 Factory Reset Touching the Factory Reset Button on the Service Screen resets all touch screen adjustable parameters back to the factory default setting. 8.E.8 HMI Model OEM only 8.E.9...

  • Page 105: Messages And Usb

    Page 101 Messages and USB Messages 8.F.1 Messages The ‘Messages’ icon at the bottom of the home screen displays an ‘Exclamation Point’ when messages are present. Press the icon to see the message(s). 8.F.2 USB Functionality The USB port is on the back of the display. To access it, open both panels and look for the black USB cable extending from the back of the display.

  • Page 106: Active Demands

    LAARS Heating Systems Page 102 8.G Active Demands The Active Demand Window indicates the status of active heat demands. Sec�on 6.5 Ac�ve Demands A black heat demand icon indicates the heat demand that is currently being satisfied. A “greyed out” heat demand icon is either lower in priority than the heat demand that is currently being satisfied, or the heat demand has reached Ac�ve Demand Bar...

  • Page 107: Section 9 Parameter Tables

    Page 103 SECTION 9 Parameter Tables (MGH and MGV) Table 22. MGH (Boiler) Parameter and Range Table (includes next 2 pages) Boilers Boilers Minimum Maximum Default Unit Time & Date Hour Hour Minute Minute Month Month Year Year Disable Enable Enable CH1 Enable/Disable 40 F...
  • Page 108 LAARS Heating Systems Page 104 Parameter Tables MGH (continued) Boilers Boilers Minimum Minimum Maximum Maximum Default Default Unit Unit Base Load 100% 100% Drop Load 30 secs 600 secs 60 secs Min On Time Seconds 30 secs 600 secs 30 secs...
  • Page 109 Page 105 Boilers Minimum Maximum Default Unit Maximum Firing Rate 100% 100% 100% Minimum Firing Rate 100% 100% Demand Max 100% Demand Min Demand On Demand Off 0-10 VDC/ 4-20 mA 0-10 VDC Input Type VDC/mA Anti- Frost Pump Only/ Pump & Anti Frost Mode Disable Pump Only...
  • Page 110 LAARS Heating Systems Page 106 Table 23. MGV (Volume Water Heaters) Parameter and Range Table (3 pages) Heater Minimum Maximum Default Units Time & Date Hour Hour Minute Minute Month Month Year Year DHW1 Disable Enable Enable DHW1 Enable/Disable DHW1 Setpoint...
  • Page 111 Page 107 Heater Minimum Maximum Default Units Boiler Internal Setpoint/ Disable Disable Loss of Lead Setup Redundant Lead Hybrid Hybrid Enable/Disable Disable Enable Disable Disable Enable Disable Hybrid Lag Mode 80 F 180 F 130 F Hybrid Setpoint °F/C Hybrid Diferential 20 F 10 F °F/C...
  • Page 112 40 F 200 F 100% 140 F Cascade DHW Setpoint °F/C Demand On Cascade DHW Proportional Gain LAARS Heating Systems Page 108 Demand Off Cascade DHW Integral Time Seconds 0-10 VDC / 4-20mA 0-10 VDC Cascade DHW Derivative Time Input Type...

  • Page 113: Section 10 Initial Startup Instructions

    Page 109 SECTION 10 Initial startup Instructions 10.A Filling the Boiler System If the water level exceeds ¼ of the volume of the expansion tank, open the tank drain, and drain to 1. Ensure the system is fully connected. Close all that level.

  • Page 114: Initial Operation

    LAARS Heating Systems Page 110 10.B Initial Operation WARNING The initial setup must be checked before the unit is Improper adjustment may lead to poor combustion put into operation. Problems such as failure to start, quality, increasing the amount of carbon monoxide rough ignition, strong exhaust odors, etc.

  • Page 115: Combustion Setup Procedure Hi Fire, Low Fire

    Page 111 10.B.2 Combustion Setup Procedure Hi-Fire, Low-Fire The gas system must be set up properly, so the boiler will run efficiently throughout its modulation range under the installed conditions. This setup should only be performed by a factory trained technician. 1.
  • Page 116 LAARS Heating Systems Page 112 Model Gas Type High-Fire CO 2 Low-Fire CO 2 Maximum CO (ppm) Greater than 8.0% All Models Natural 9.0% +/- 0.2% & less than 9.2% Table 24. Combustion Settings. Natural Gas LP (propane) 8. If needed, adjust the fuel pressure adjustment 4.0 IN - W.C.

  • Page 117: Shutting Down The Unit

    Page 113 10.C Shutting Down the Unit 10.E Controllers Thisstepmustbeperformedbyaqualifiedservice person. This unit utilizes three (3) separate controllers to Turn off the main electrical disconnect switch. manage system functions, burner management and air/ fuel ratio control: Close all manual gas valves. - Burner Integrated Control (BIC) If freezing is anticipated, drain the unit and be sure to also protect the building piping from freezing.

  • Page 118: Transmitters

    LAARS Heating Systems Page 114 10.F Transmitters This unit utilizes a pair of pressure transmitters to After the burner has been on for two (2) minutes determine that the pressure drop across the combustion the oxygen trim loop will be enabled and the blower...

  • Page 119: Section 11 Maintenance

    Page 115 SECTION 11 Maintenance 11.A System Maintenance 11.B Maintenance Notes Do the following once a year: Use only genuine manufacturers replacement parts. Lubricate all the pumps in the system, per the CAUTION instructions on the pump. When servicing the controls, label all wires before Inspect the venting system for obstruction or disconnecting them.

  • Page 120: Controller

    LAARS Heating Systems Page 116 secured and reconnected to the LMV. chassis. To remove the spark ignition electrodes, shut off the power to the unit, turn off the main gas supply In the event of failure of the on/off Honeywell solenoid, and open the front door of the boiler to gain access to the entire valve must be replaced.

  • Page 121: Heat Exchanger Tubes

    Page 117 high voltage box. The speed of the motor is determined the surfaces of the heat exchanger tubes. by the controls logic which is delivered to the VFD by a 0-10VDC signal. 7. Once the tubes have been brushed clean, rinse the tubes and combustion chamber with a small amount If it is necessary to service, remove, or replace the blower, of water to rinse all of the debris out of the bottom...

  • Page 122: Pressure Transmitters

    11.B.10 Pressure Transmitters The pressure transmitters are powered with 5 VDC from the Laars Linc controller and output a 0.5 to 4.5 VDC signal from 0 to 4 inches water column differential pressure. If the pressure transmitters do not read the same value within a prescribed margin of error a lockout will occur and an “Air Pressure Drift Error”...

  • Page 123: Section 12 Troubleshooting

    Page 119 SECTION 12 Troubleshooting 12.A Lockouts and Errors. Condition Information Corrective Action • • Flow Switch Insufficient flow at the outlet of the Faulty boiler/heater pump – replace pump. • boiler/heater Faulty pump contactor – replace contactor. • • Auto-reset Condition Blown boiler/heater pump fuse –...
  • Page 124 LAARS Heating Systems Page 120 Condition Information Corrective Action • • Flow Switch Insufficient flow at the outlet of the Faulty boiler/heater pump – replace pump. 2463 4937 • boiler/heater Faulty pump contactor – replace contactor. 1739 3489 • •...

  • Page 125: Lmv Errors

    Loss of flame due to TUV test (loss of flame test) signal. An enable signal was received but the LMV will not startup due to a lack Any # Safety Loop of a safety signal from the Laars Linc OFF S Any # Internal error Any #...
  • Page 126 LAARS Heating Systems Page 122 Error Diag. Meaning for the LMV3 Corrective Action Code Code Note: Diagnostic codes are additive. If a diagnostic code appears that is not on this list, it is a combination of multiple diagnostic codes. Standardization timed out because the VSD took too long to ramp down Timeout of standardization (VSD ramp down time too long) at the end of the standardization.
  • Page 127 Page 123 Error Diag. Meaning for the LMV3 Corrective Action Code Code Note: Diagnostic codes are additive. If a diagnostic code appears that is not on this list, it is a combination of multiple diagnostic codes. No speed signal was detected. 1) Ensure that the motor is rotating.
  • Page 128 LAARS Heating Systems Page 124 Error Diag. Meaning for the LMV3 Corrective Action Code Code Note: Diagnostic codes are additive. If a diagnostic code appears that is not on this list, it is a combination of multiple diagnostic codes. Verify that the valve connected to the fuel actuator is not bound. Ensure...
  • Page 129 Page 125 This page intentionally left blank...

  • Page 130: Section 13 Replacement Parts

    To order or purchase parts, contact your nearest manufacturers dealer or distributor. (See the back cover of this manual for the manufacturers website). 13.B Component Illustrations, Parts Lists, and Part Numbers THIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE REVISIONS PROPRIETARY TO LAARS HEATING SYSTEMS CO.AND SHALL NOT BE REV. DRAFT CHECK ENGR APPR...
  • Page 131 Page 127 13.B.1 Frame and Jacket Assembly, Part Numbers 1600 2000 2500 3000 3500 4000 ITEM DESCRIPTION PART NO. PART NO. PART NO. PART NO. PART NO. PART NO. HEAT EXCHANGER ASSEMBLY R16N2180 R20N2180 R25N2180 R30N2185 R30N2180 R40N2180 SHROUD ASSEMBLY, UPPER (PRIMARY) 20N2049 20N2049 30N2049...
  • Page 132 CONTROLLER ASSY, O2 SENSOR 30N7089 RXN71 PANEL ASSY, CONTROL, SHEET METAL 30N7092 RXN71 CABLE, DIAGNOSTIC HANDSET, 7 FT LONG E2393000 RXN71 CONTROLLER ASSY, LAARS LINC® 30N7096 RXN71 LABEL, CONTROL PANEL, MGT H2363500 RXN71 SWITCH, CUTOFF, LOW WATER RE2075100 RXN71 LMV (Pre-Programmed and Model Serial # Specific )
  • Page 133 Page 129 13.B.3 Blower and Burner Assembly, Part Numbers. ALL Sizes 1600 2000 2500 3000 3500 4000 ITEM DESCRIPTION PART NO. PART NO. PART NO. PART NO. PART NO. PART NO. PLATE WELDMENT, ADAPTER, BLOWER 16N5062 20N5037 30N5037 30N5037 30N5037 30N5037 VALVE-ACTUATOR ASSY, SIEMENS V2028300...
  • Page 134 LAARS Heating Systems Page 130 Blower-Burner Assembly 2.0 Blower-Burner Assembly 2.0 4.90 .13 TOP HOLE FIRST ROW IN PILOT TUBE OF SLOTS INSIDE 4.90 .13 TOP HOLE BURNER FIRST ROW IN PILOT TUBE OF SLOTS INSIDE BURNER DETAIL C PILOT TUBE TO BURNER...
  • Page 135 Page 131 Blower-Burner Assembly 2.5-4.0 Blower-Burner Assembly 2.5-4.0 5.23 TOP HOLE PILOT TUBE FIRST ROW 5.23 OF SLOTS TOP HOLE INSIDE BURNER PILOT TUBE FIRST ROW OF SLOTS INSIDE BURNER DETAIL PILOT TUBE TO BURNER NOTE: PILOT TUBE MUST SIT FLUSH AGAINST BURNER SCALE 1 : 4 DETAIL PILOT TUBE TO BURNER...
  • Page 136 LAARS Heating Systems Page 132 13.B.4 AC Distribution Box Assemblies and Part Numbers (Model 1600) MGT 2.0 HTD ITEM# DESCRIPTION 120V 240V 208V 1Ø BUSHING, NYLON, 7/8, SLIT S0064900 S0064900 S0064900 GFCI RECEPTACLE, NEMA 5-15, IVORY, BOX MOUNT E2355400 E2355400...
  • Page 137 Page 133 13.B.5 AC Distribution Box Assemblies and Part Numbers (Model 2000) 1Ø 3Ø MGT 2.0 HTD ITEM# DESCRIPTION 120V 240V 208V 1Ø 208V 3Ø 480V 600V BUSHING, NYLON, 7/8, SLIT S0064900 S0064900 S0064900 S0064900 S0064900 S0064900 GFCI RECEPTACLE, NEMA 5-15, IVORY, BOX MOUNT E2355400 E2355400 E2355400...
  • Page 138 LAARS Heating Systems Page 134 13.B.6 AC Distribution Box Assemblies and Part Numbers (Models 2500 - 4000) 2500 & 3000 3500 & 4000 208V 480V 600V 208V 480V 600V ITEM # DESCRIPTION S0064900 S0064900 S0064900 S0064900 S0064900 S0064900 BUSHING, NYLON, 7/8, SLIT...
  • Page 139 Page 135 13.B.7 Waterway Inlet Assembly, Part Numbers 13.B.7 Waterway Inlet Assembly, Part Numbers 13.B.7 Waterway Inlet Assembly, Part Numbers Part Number by Boiler Size Item Description 1600 2000 2500 3000 3500 4000 Weldment, Waterway Inlet 20N4026 20N4026 20N4026 20N4026 40N4026 40N4026 Sensor, Water Temp, 1/4"...
  • Page 140 LAARS Heating Systems Page 136 13.B.8 Waterway Outlet Assembly, Part Numbers Waterway Outlet Assembly, Part Numbers Part Number by Boiler Size Part Number by Boiler Size Item # Description Item # Description 1600 1600 2000 2000 2500 2500 3000 3000...
  • Page 141 Page 137 13.B.9 Model 1600 Gas Train Assembly 1600 ITEM DESCRIPTION PART NO. VALVE-ACTUATOR ASSY, GAS, 1" NPT V2025500 ACTUATOR, ELECTRO-HYDRAULIC V2025400 VALVE BODY, SINGLE GAS, 1-1/2 NPT V2025200 VALVE GAS SOLENOID, 1 - 1/2" NPT V2026400 VALVE, PILOT REGULATOR V2022100 SWITCH, LOW GAS PRESSURE R2004100...
  • Page 142 LAARS Heating Systems Page 138 13.B.10 Gas Train Assembly, Model 2000 1600 ITEM DESCRIPTION PART NO. VALVE-ACTUATOR ASSY, GAS, 1" NPT V2025500 ACTUATOR, ELECTRO-HYDRAULIC V2025400 VALVE BODY, SINGLE GAS, 1-1/2 NPT V2025200 VALVE GAS SOLENOID, 1 - 1/2" NPT V2026400...
  • Page 143 Page 139 13.B.11 Gas Train Assembly, Model 2500 & 3000 1600 ITEM DESCRIPTION PART NO. VALVE-ACTUATOR ASSY, GAS, 1" NPT V2025500 ACTUATOR, ELECTRO-HYDRAULIC V2025400 VALVE BODY, SINGLE GAS, 1-1/2 NPT V2025200 VALVE GAS SOLENOID, 1 - 1/2" NPT V2026400 VALVE, PILOT REGULATOR V2022100 SWITCH, LOW GAS PRESSURE R2004100...
  • Page 144 Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355 Headquarters: the PMS® 300 mark, o white outline. 9 Brigden Gate, Halton Hills, Ontario, Canada L7G 0A3 (905) 203-0600 Fax: (905) 636-0666 www.Laars.com Litho in U.S.A. © Laars 1909 Document 1422...

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