Laars MAGNATHERM MGH2000 Installation And Operation Instructions For
Laars MAGNATHERM MGH2000 Installation And Operation Instructions For

Laars MAGNATHERM MGH2000 Installation And Operation Instructions For

Modulating boiler water heater
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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 these instructions is
not followed exactly, a fire or explosion
may result causing property damage,
personal injury or death.
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
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 neighbor's phone. Follow the gas
supplier's instructions.
• If you cannot reach your gas supplier, call
the fire department.
Installation and service must be performed
by a qualified installer, service agency, or gas
supplier.
Installation and
Operation Instructions for
M
Modulating Boiler
Model MGH2000
1,999 MBTU/h
Model MGH3000
3,000 MBTU/h
Model MGH4000
4,000 MBTU/h
WARNING
T
AGNA
HERM
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 ou ni
d'autres vapeurs ou liquides inflammables dans
le à proximité 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 dans le bâtiment où vous vous trovez.
• 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 1276
®
Water Heater
Model MGV2000
1,999 MBTU/h
Model MGV3000
3,000 MBTU/h
Model MGV4000
4,000 MBTU/h
AVERTISSEMENT

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Summary of Contents for Laars MAGNATHERM MGH2000

  • Page 1 Installation and Operation Instructions Document 1276 Installation and Operation Instructions for AGNA HERM ® Modulating Boiler Water Heater Model MGH2000 Model MGV2000 1,999 MBTU/h 1,999 MBTU/h Model MGH3000 Model MGV3000 3,000 MBTU/h 3,000 MBTU/h Model MGH4000 Model MGV4000 4,000 MBTU/h 4,000 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 6 – Water connectIonS, mGh Section 1 - General InformatIon MGH System Piping: Hot Supply Introduction ............1 Connections ............19 Safety Notes ............. 1 MGH Cold Water Make-Up ......19 1.3 Model Identification ......... 2 MGH Freeze Protection........19...
  • Page 3 LAARS Heating Systems Section 9 – naVIGatInG the touch Screen Section 11 – maIntenance The Touch Screen ..........40 11.1 System Maintenance........64 Using the Touch Screen ........40 11.2 Maintenance Notes .........64 9.3 Verification Process for Safety-Related 11.2.1 Burner ............. 64 Parameters ............42 11.2.2 Modulating Gas Valve/ Venturi ......64 While Operating - Checking Individual 11.2.3 Controllers ............65...
  • Page 4 LAARS Heating Systems...
  • Page 5: Section 1 - General Information

    MagnaTherm 2000, 3000 and 4000 systems. Please read this manual completely before proceeding with the installation. If you have any questions regarding this equipment, please consult the LAARS Heating Systems factory, or a local factory representative. Many operating problems are caused by improper installation.
  • Page 6: Model Identification

    WarnInG 1 = First MagnaTherm units must be installed in accordance with the procedures detailed in this manual, or the LAARS Heating Systems warranty will be voided. WarnInG The installation must conform to the requirements Electrical Shock Hazard of the local jurisdiction having authority, and,...
  • Page 7: Unit Overviews 2Mbh, 3Mbh, 4Mbh

    MagnaTherm Boilers and Water Heaters Page 3 Unit overviews The next 3 pages give a visual reference to Models 2000, 3000, and 4000 Blower Manual gas valve Touch Screen Heat Exchanger Condensing Unit Power Pack Air Intake and Filter model 2000 Perspective from front left corner.
  • Page 8 Page 4 LAARS Heating Systems Blower Manual gas valve Touch Screen Heat Exchanger Condensing Unit Air Intake and Filter Power Pack Water Outlet Water Inlet Vent Condensate Trap model 3000...
  • Page 9 MagnaTherm Boilers and Water Heaters Page 5 Blower Manual gas valve (hidden behind main gas valve) Touch Screen Heat Exchanger Condensing Unit Air Intake and Filter Water Outlet Power Pack Water Inlet Vent Condensate Trap model 4000...
  • Page 10: Dimensions

    Page 6 LAARS Heating Systems Dimensions model Inches (cm ) Inches (cm ) 2000 29.3 (75 ) 79 (201 ) 38 (96 ) 57.5 (147 ) 49.8 (126 ) 4.8 (12 ) 60.8 (154 ) 2.6 (7 ) 8.4 (21 ) 67.4 (1...
  • Page 11: Unpacking

    MagnaTherm Boilers and Water Heaters Page 7 Unpacking note - When located on the same wall, the MagnaTherm combustion air intake terminal must be The MagnaTherm is shipped in a single crate. installed a minimum of 12” ( below the exhaust 30cm) Remove all packing and tie-down materials.
  • Page 12: Section 3 - Venting And Combustion Air

    Page 8 LAARS Heating Systems Section 3 VentInG anD ComBUStIon aIr Combustion air MagnaTherm boilers and water heaters must have commencing within 12” (300 mm) of the top and provisions for combustion and ventilation air in one commencing within 12” (300 mm) of the accordance with the applicable requirements for bottom, of the enclosure shall be provided.
  • Page 13: Ducted Combustion Air

    The combustion air can be taken through the wall, or including but not limited to, ANSI Z223.1/NFPA 54, through the roof. LAARS offers accessories to use CSA B149.1, CSAB149.2 and ULC S636. Failure with ducted air systems, as shown in Table 3.
  • Page 14: Common Venting

    The maximum equivalent pipe length allowed is 100 feet (30m). Each elbow is considered to be All installations must be done following the vent 5 feet (1.5m). Laars offers accessories to use with supplier’s recommended installation techniques. (Place in section 3.1)
  • Page 15: Locating The Vent And Combustion Air Terminals

    Up to and including 110°c / 230°F and certified vent system, Laars suggests the use of a Up to and including 135°c / 275°F coupler fitting from the certified vent system into which the vent terminal screen can be installed.
  • Page 16 Page 12 LAARS Heating Systems 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) deck, or balcony See note 6 See note 6 B= Clearance to window or door that may be Direct vent only: 12 inches (30 cm);...
  • Page 17: Side Wall Combustion Air Terminal

    MagnaTherm Boilers and Water Heaters Page 13 objects. if the boiler or water heater uses ducted combustion air from an intake terminal located on the same wall, see See Figure 5 and Figure 4 for proper spacing and orientation. in the U.S., if the vent termination is located in an area exposed to high winds, an cPVc tee (the same diameter as the vent pipe) may be used.
  • Page 18: Vertical Vent Terminal

    Page 14 LAARS Heating Systems 3.3.3 Vertical Vent terminal when the unit is vented through the roof, the vent must extend at least 3 feet (0.9 m) above the point at which it penetrates the roof. it must extend at least 2 feet (0.6 m) higher than any portion of a...
  • Page 19: Common Vent Test

    MagnaTherm Boilers and Water Heaters Page 15 7. Any improper operation of the common venting Common Vent test system should be corrected so the installation conforms with the national Fuel Gas code, note -This section does not describe a method AnSi Z223.1/nFPA 54 and/or cAn/cSA for common venting MagnaTherm’s.
  • Page 20: Outdoor Installation

    Page 16 LAARS Heating Systems (Place in section 3.5) Model 2000 Model 3000 Model 4000 Air intake screen for unit placed outdoors CA011901 CA011902 CA0011903 Vent terminal for unit placed outdoors CA011801 CA011802 CA011803 table 7. air & Vent accessories for Units Placed outdoors Table 3** - Air &...
  • Page 21 Actual ID: 2.067 2.469 3.068 4.026 5.047 Length (ft) Capacity in Cubic Feet of Gas per Hour 4,020 6,400 11,300 23,100 41,800 MagnaTherm Boilers and Water Heaters Page 17 2,760 4,400 7,780 15,900 28,700 2,220 3,530 6,250 12,700 23,000 1,900 3,020 5,350 10,900...
  • Page 22: Magnatherm Boiler Flow And Head Requirements

    2000 29.3 38.0 57.0 3000 30.8 41.5 60.5 4000 34.5 52.0 70.0 Page 18 LAARS Heating Systems Sizing Data Section 5 Input Rate Gas Pipe Water Pipe Water floW reqUIrementS Size Inches (NPT) (NPT) Boiler Water Flow Requirements 57.0 2000...
  • Page 23: Mgh System Piping: Hot Supply Connections

    Do not use automotive antifreeze. To help prevent properly installed. freezing, Laars recommends the use of inhibited The MagnaTherm’s efficiency is higher with glycol concentrations between 20% and 35% glycol. lower return water temperatures. Therefore, to...
  • Page 24: Mgh Suggested Piping Schematics

    Page 20 LAARS Heating Systems Different glycol products may provide varying degrees of protection. Glycol products must the accumulation of condensate. when a condensate be maintained properly in a heating system, or pump is not used, the tubing must continuously they may become ineffective.
  • Page 25 MagnaTherm Boilers and Water Heaters Page 21 Low temp. radiant zone Space heating zone circuits Space heating zone circuit Air vent System pump 4 pipe dia. max. 4 pipe dia. max. 4 pipe dia. max. Water feed controls 4 pipe dia. max. Note - This drawing is a schematic representation of a piping style,...
  • Page 26 Page 22 LAARS Heating Systems 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 27 MagnaTherm Boilers and Water Heaters Page 23 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.
  • Page 28 Page 24 LAARS Heating Systems Space heating zone circuits High temp. space heating zone circuit Space heating zone circuit Air vent 4 pipe dia. max. 4 pipe dia. max. Water feed controls Expansion tank 4 pipe dia. max. Common piping must be sized for the combined water ow of all the boilers.
  • Page 29: Mgv Water Quality

    MagnaTherm Boilers and Water Heaters Page 25 Section 7 - Water ConneCtIonS 7.2 mGV Suggested Piping Schematics Figure 11 through Figure 13 show suggested piping mGV UnItS configurations for MGV boilers. These diagrams are only meant as guides. All components or piping 7.1 mGV Water quality required by local code must be installed.
  • Page 30: Mgv Suggested Piping Schematics

    Page 26 LAARS Heating Systems event of pressure relief. install a diaphragm-type 7.5 mGV freeze Protection expansion tank, flow check, and shutoff valves if installing outdoors in a location that may where needed or as required by code. experience freezing temperatures, precautions must...
  • Page 31: Mgv Water Flow

    MagnaTherm Boilers and Water Heaters Page 27 Building return noteS: note: This drawing shows 1. Locate the MGV DHW sensor suggested piping configuration and or remote aquastat well valving. Check with local codes and in lower 1/3 of tank. ordinances for additional requirements. Cold water 2.
  • Page 32: Section 8 - Electrical Connections

    120-600 volts with single or 3 phase versions. Refer to the rating plate for appropriate voltage and current ratings. As a common industry practice, Laars has color coded the single and three phase wires.
  • Page 33: Pump Connections And Operation

    MagnaTherm Boilers and Water Heaters Page 29 Model 2000 3000 4000 ø ø ø ø ø ø ø ø Voltage 208 3 480 3 600 3 208 3 480 3 600 3ø 208 3 480 3 600 3 Nominal 15.1 12.5 Current 22.6...
  • Page 34: Control Panel Layout

    Page 30 LAARS Heating Systems 8.4 Control Panel layout figure 14. electronics Panel layout...
  • Page 35 MagnaTherm Boilers and Water Heaters Page 31 PARTS LIST ITEM NO. PART NO. DESCRIPTION CA0099 VARI-PRIME PRINTED CIRCUIT BOARD KIT KM004400 AUTO-RESET HIGH LIMIT CONTROL E2339800 TOUCH SCREEN E2346100 BAS GATEWAY (optional) KM004300 LOW WATER CUT-OFF A0014300 ALARM BELL (optional) A0014300 Terminal block for field connections E0086800...
  • Page 36: Wiring Diagram

    Page 32 LAARS Heating Systems THIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE PROPRIETARY TO LAARS HEATING SYSTEMS CO. AND SHALL NOT BE REPRODUCED, TRANSFERRED TO OTHER DOCUMENTS, USED OR DISCLOSED TO OTHERS FOR MANUFACTURING OR ANY OTHER PURPOSE EXCEPT AS SPECIFICALLY AUTHORIZED IN WRITING BY LAARS HEATING SYSTEMS CO.
  • Page 37 DECIMALS .X FRACTIONS 1/8" DIMENSIONS ARE IN INCHES. SHIELDED VTB6 DECIMALS .XX 24VAC POWER DIGITIZED CABLE DECIMALS .XXX .010 TITLE: VTB1 P/N LAARS-1 ANGLES DIAGRAM, WIRING/BLOCK, MGT (OPTIONAL) APPROVALS MATERIAL: DRAFT 4/19/13 ENGR INTENDED SIZE: SOFTWARE DWG. NO: REV. E23512...
  • Page 38: High Voltage Wiring Diagrams

    Page 34 LAARS Heating Systems 8.6 High Voltage Wiring Diagrams 120V N 120V N 120V H 120V H figure 16. three-Phase High Voltage Wiring...
  • Page 39 MagnaTherm Boilers and Water Heaters Page 35 figure 17. 220 Volt Single Phase, High Voltage Wiring...
  • Page 40 Page 36 LAARS Heating Systems figure 18. 110 Volt Single Phase, High Voltage Wiring...
  • Page 41: Ladder Diagrams

    MagnaTherm Boilers and Water Heaters Page 37 8.7 ladder Diagrams figure 19. three-Phase ladder Diagram...
  • Page 42 Page 38 LAARS Heating Systems figure 20. 220 Volt Single Phase ladder Diagram...
  • Page 43 MagnaTherm Boilers and Water Heaters Page 39 figure 21. 110 Volt Single Phase ladder Diagram...
  • Page 44: Section 9 - Navigating The Touch Screen

    Page 40 LAARS Heating Systems Section 9 naVIGatInG tHe toUCH SCreen The home screen shows a picture of the MagnaTherm controller. The color of the controller depends on the status of the MagnaTherm, as shown below. Color Status Control Icon...
  • Page 45 MagnaTherm Boilers and Water Heaters Page 41 To change some parameters, a password is required. Screen Menu Icons The control system includes three levels of password protection: OEM Password Setup and parameter changes available only to the factory. installer Password Setup and parameter changes There are several icons at the top of the Touch made when the system is Screen Menus (and most of the other screens) that...
  • Page 46: Verification Process For Safety-Related Parameters

    Page 42 LAARS Heating Systems menu 6. Parameter Safety Warning menu 4. login required WarnInG The screen used to Login is similar to the Keyboard Changing safety parameters should only be screen. conducted by experienced, licensed boiler operators and mechanics. Hazardous burner conditions can...
  • Page 47 MagnaTherm Boilers and Water Heaters Page 43 menu 8. Safety Parameter reset when the process is complete, the system will tell you to reset the control system. The Reset button is located on the front of the controller. you must press the Reset button within 30 figure 24.
  • Page 48: Configuring Parameters On Individual

    Page 44 LAARS Heating Systems menu 12. Status Summary Screen menu 10. Status Summary Screen notice the four buttons at the bottom of each Press the Configure button to start a Status Summary screen: configuration session for the controller. • Configure – Allows an installer to change some of the setup parameters used by the system.
  • Page 49: Setting The Date And Time On The System Display

    MagnaTherm Boilers and Water Heaters Page 45 Setting the Date and time on the System Display The display includes an internal clock, which keeps Press the Display Setup button at the bottom track of the date and time. This setting is important, of the screen.
  • Page 50: Configuration Menus (All)

    Page 46 LAARS Heating Systems 9.7 Configuration Menus the following sections give overviews of each configuration sub menu. 9.7.1 System Identification & Access menu 18. Home Screen To navigate to the Configuration Menu Screen, first touch the controller icon on the home screen to access the Status Summary screen,...
  • Page 51: Ch - Central Heat Configuration

    MagnaTherm Boilers and Water Heaters Page 47 9.7.6 Demand Priority Configuration A factory supplied Outdoor air temperature sensor is used with the Outdoor Reset and warm weather Shutdown features. wiring For single boiler operation, the outdoor sensor will be connected to TB1-21A and 22A. For Lead Lag operation of multiple boilers, the outdoor sensor will be connected to TB1-21A and 22A on the Slave Boiler, and the system sensor (supplied with boiler)
  • Page 52: Statistics Configuration

    Page 48 LAARS Heating Systems 9.7.11 Stack limits The controller in the Magnatherm energizes the appropriate pump contacts when it receives a call for heat. Once the call for heat is satisfied, the pumps will remain on for the defined pump overrun time.
  • Page 53: Burner Control Ignition

    MagnaTherm Boilers and Water Heaters Page 49 9.7.14 Burner Control Ignition 9.7.16 Sensor Configuration The Pilot test hold function allows the installer to set The outdoor temperature can be read from the pilot flame to the required pressures listed in Table the outdoor sensor that is shipped with the 14, without turning on the Main valve.
  • Page 54: Lead Lag Slave Configuration

    Page 50 LAARS Heating Systems 9.7.17 Lead Lag Slave Configuration Caution About Lead/Lag Operation - You should set the Modbus addresses before if an installation includes two or more boilers, they you connect the Modbus wiring. If the wiring may be set up for “Lead/Lag” operation. One boiler is attached before the Modbus addresses on will be set up as the “Master”, and the others will...
  • Page 55 MagnaTherm Boilers and Water Heaters Page 51 number of boilers Base load value installed Low demand - The first boiler in sequence fires at less than 65% Demand increases - Once the first boiler reaches 50%, the second boiler switches on, and table 15.
  • Page 56 Page 52 LAARS Heating Systems you will be prompted to sign in. This can be done by pressing the ‘LOcK’ symbol at the top right Select ‘Configure’. type in ‘ ’ (LnT lower case) and press OK. Then you can select Slave Enable.
  • Page 57: Lead Lag Master Configuration

    MagnaTherm Boilers and Water Heaters Page 53 Wiring Connections for Lead/Lag - 9.7.18 Lead Lag Master Configuration now you can make the Modbus wiring connections Then set up the Master controller by going to the Lead between the units. The controller in each boiler Lag Master boiler and opening up the Lead Lag Master includes two wiring terminals for the Modbus system, Configuration in that boilers Configuration Menu.
  • Page 58 Minimum Boiler Water Temp 40F - 180F Outdoor Reset Config DHW Enable Enabled Enable / Disable DHW Config Page 54 LAARS Heating Systems Sensor Only STAT Terminal Auto:DHW (S6) or Demand Switch Auto: DHW (S6) or EnviroCOM DHW DHW Config Sensor Only...
  • Page 59 CH Frost Protection Enable Enabled Frost Protection Config Enable / Disable DHW Frost Protection Enable Enabled Enable / Disable Frost Protection Config Lead Lag Frost Protection Enable Enabled Enable / Disable Frost Protection Config MagnaTherm Boilers and Water Heaters Page 55 Lead Lag Frost Protection Rate 0% - 100% Frost Protection Config...
  • Page 60 Lead Lag Master Config- Lead Rotation Time 0 min 0 sec - 1080 hrs 0 min 0 sec (7 days) Adv Settings-Algorithms Page 56 LAARS Heating Systems Lead Lag Master Config- Base Load Common 20% - 100% Adv Settings-Rate Allocation Parameter Name...
  • Page 61: Connections To A Building Automation System

    Modbus ports. The Modbus wiring must be completed according to the diagrams shown below. if alternate communication protocols are desired, Laars offers “gateways” to allow BAcnet, LOn, and other communications protocols. For additional information on setting up Modbus and other communication protocols, contact the factory.
  • Page 62: Vari-Prime Flow Control System

    Page 58 LAARS Heating Systems 9.10 Vari-Prime if Main Gas valve is “OFF” AnD a call for heat is “TRUE” then the PcB overrides the PiD control Vari-Prime is a variable pump control that is and runs the pump output at 100% (10 VDc, or 20 standard equipment on all MGH boilers.
  • Page 63: Combustion Setup Procedure

    MagnaTherm Boilers and Water Heaters Page 59 9.11 – Combustion Setup Procedure in this section, we will explain how to set up the gas valve so the boiler will run efficiently at both the High Fire and Low Fire conditions. Required tools: Screwdrivers, Torx bits, Allen wrench Set, combustion Analyzer WarnInG...
  • Page 64 Page 60 LAARS Heating Systems Model Gas Type High Fire CO Low Fire CO Pressure Differential Natural 9.0% ± 0.2 0.25% lower than high fire CO 0.5” to 1.2” wc* 2,000 Propane 10.0% ± 0.2 0.25% lower than high fire CO 0.5”...
  • Page 65 MagnaTherm Boilers and Water Heaters Page 61 Magnatherm is equipped with a zero governing, negative regulator valve. The valve throttle should be adjusted only at high fire, and the offset adjustment is only to be done at low fire. From the “Home” screen touch the control icon, then touch “Operation”.
  • Page 66: Section 10 - Initial Startup Instructions

    Page 62 LAARS Heating Systems Section 10 InItIal StartUP InStrUCtIonS 10.1 filling the Boiler System Ensure the system is fully connected. close all 12. close the make-up water valve. check the bleeding devices and open the make-up water strainer in the pressure reducing valve for valve.
  • Page 67: Initial Operation

    MagnaTherm Boilers and Water Heaters Page 63 10.2 Initial operation Caution The initial setup must be checked before the unit is If any odor of gas is detected, or if the gas put into operation. Problems such as failure to start, burner does not appear to be functioning rough ignition, strong exhaust odors, etc.
  • Page 68: Section 11 - Maintenance

    11.1 System maintenance 11.2 maintenance notes Do the following once a year: Use only genuine LAARS replacement parts. Lubricate all the pumps in the system, per the instructions on the pump. Caution inspect the venting system for obstruction or When servicing the controls, label all wires be- leakage.
  • Page 69: Controllers

    MagnaTherm Boilers and Water Heaters Page 65 connecting the boiler to the main gas supply line. resistance of the wires can be measure to be in the Remove the front doors of the boiler, and the top range of 9-17 oHms if the ignitor is good, and zero panels, to gain access to the gas valve and fuel/air or infinity oHms would indicate a defective ignitor.
  • Page 70: Gas Pressure Switches (Optional)

    Page 66 LAARS Heating Systems the following; incomplete combustion, combustion WarnInG air problems, venting problems or heater short cycling. Soot buildup or other debris on the heat Failure to rinse the debris from the heat exchanger may restrict the flue passages.
  • Page 71: Section 12 - Troubleshooting

    MagnaTherm Boilers and Water Heaters Page 67 Section 12 troUBleSHootInG Lockout will appear in an orange bar across the bottom of the screen. if you tap the orange bar, 12.1 lockouts, Holds, and alerts the system will present more information about The control system on the MagnaTherm responds to the Lockout.
  • Page 72 Page 68 LAARS Heating Systems 3. Press the long yellow Alert or yellow Lockout Bar (the long bar will be a long Grey ‘History’ Bar if not currently in Alert or Lockout). menu 31. lockout History 4. you can see more detailed information of an alert menu 29.
  • Page 73: Troubleshooting Table

    MagnaTherm Boilers and Water Heaters Page 69 12.2 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 first column lists the code number that will appear at the beginning of the Lockout or Hold message in the orange bar at the bottom of the screen.
  • Page 74 Page 70 LAARS Heating Systems code Description Lockout Procedure or Hold internal fault: internal fault Invalid burner control state flag 1. Reset module 2. if fault repeats, replace module. internal fault: internal fault Safety relay drive cap short 1. Reset module 2.
  • Page 75 MagnaTherm Boilers and Water Heaters Page 71 code Description Lockout Procedure or Hold internal fault: internal fault Static flame ripple 1. Reset module 2. if fault repeats, replace module. internal fault: internal fault Flame rod shorted to ground detected 1. Reset module 2.
  • Page 76 Page 72 LAARS Heating Systems code Description Lockout Procedure or Hold Ac input phases reversed 1. check the module and display connections. 2. check the module power supply and make sure that both frequency and voltage meet the specifications. 3. On 24 VAc applications, assure that J4 terminal 10 and J8 terminal 2 are connected together.
  • Page 77 MagnaTherm Boilers and Water Heaters Page 73 code Description Lockout Procedure or Hold Outlet high limit H or L 1. check wiring and correct any possible errors. 2. Replace the outlet high limit. 3. if previous steps are correct and fault persists, replace the module.
  • Page 78 Page 74 LAARS Heating Systems code Description Lockout Procedure or Hold internal Fault: A2D mismatch. internal Fault. 1. Reset module. 2. if fault repeats, replace module. internal Fault: Exceeded VSnSR internal Fault. voltage tolerance 1. Reset module. 2. if fault repeats, replace module.
  • Page 79 MagnaTherm Boilers and Water Heaters Page 75 code Description Lockout Procedure or Hold Flame lost in run 1. check main valve wiring and operation - correct any errors. 2. check the fuel supply. 3. check fuel pressure and repeat turndown tests. 4.
  • Page 80 Page 76 LAARS Heating Systems code Description Lockout Procedure or Hold Fan speed failed during preignition H or L 1. check wiring and correct any potential wiring errors. 2. check the VFDs (Variable-speed Fan Drive) ability to change speeds. 3. change the VFD 4.
  • Page 81 MagnaTherm Boilers and Water Heaters Page 77 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 82 Page 78 LAARS Heating Systems code Description Lockout Procedure or Hold Block intake On 1. check wiring and correct any errors. 2. inspect the Block intake Switch to make sure it is working correctly. 3. Reset and sequence the module.
  • Page 83 MagnaTherm Boilers and Water Heaters Page 79 code Description Lockout Procedure or Hold invalid DHw (Domestic Hot water) 1. Return to Configuration mode and recheck high limit enable setting selected parameters, reverify and reset module. 2. if fault repeats, verify electrical grounding. 3.
  • Page 84 Page 80 LAARS Heating Systems code Description Lockout Procedure or Hold invalid lightoff rate setting 1. Return to Configuration mode and recheck selected parameters, reverify and reset module. 2. if fault repeats, verify electrical grounding. 3. if fault repeats, replace module.
  • Page 85 MagnaTherm Boilers and Water Heaters Page 81 code Description Lockout Procedure or Hold invalid Prepurge time setting 1. Return to Configuration mode and recheck selected parameters, reverify and reset module. 2. if fault repeats, verify electrical grounding. 3. if fault repeats, replace module. invalid Purge rate proving setting 1.
  • Page 86 Page 82 LAARS Heating Systems code Description Lockout Procedure or Hold invalid Flame threshold setting 1. Return to Configuration mode and recheck selected parameters, reverify and reset module. 2. if fault repeats, verify electrical grounding. 3. if fault repeats, replace module.
  • Page 87: Diagnostic Tests And Input/Output Indicators

    MagnaTherm Boilers and Water Heaters Page 83 code Description Lockout Procedure or Hold invalid DHw (Domestic Hot water) 1. Return to Configuration mode and recheck connector type setting selected parameters, reverify and reset module. 2. if fault repeats, verify electrical grounding. 3.
  • Page 88: Lead/Lag Slave Diagnostics

    Page 84 LAARS Heating Systems menu 36. analog I/o Screen menu 39. lead/lag Diagnostics Press the button for Diagnostic Tests. The Use the left- and right-arrows to see all of the Modulation test allows you to change the columns in the display.
  • Page 89: Control Snapshot

    MagnaTherm Boilers and Water Heaters Page 85 To use this function, select the parameter you want to track from the pull-down list. The system will present a graph that tracks that variable. To see the graph for the currently-selected function, press the View button.
  • Page 90: Section 13 - Replacement Parts

    General Information To order or purchase parts for the LAARS MagnaTherm Appliance, contact your nearest LAARS dealer or distributor. if they cannot supply you with what you need, contact customer Service. (See the back cover for addresses, and for telephone and fax numbers.)
  • Page 91: Component Illustrations, Parts Lists, And Part Numbers

    MagnaTherm Boilers and Water Heaters Page 87 13.2 Component Illustrations, Parts lists, and Part numbers Frame and Jacket Assembly 13.2.1 frame and Jacket assembly, Part numbers 2000 3000 4000 Item # Description Part No. Part No. Part No. Base assembly 20N1000 30N1000 40N1000...
  • Page 92 Page 88 LAARS Heating Systems DETAIL A final assembly View from Back...
  • Page 93: Final Assembly

    Bracket, hinge brace 30N3055 30N3055 30N3055 Panel, top left 20N3035 30N3057 40N3035 Bracket, pressure switch 5F7007 5F7007 5F7007 MagnaTherm Boilers and Water Heaters Page 89 Cover, field connections 17J3025 17J3025 17J3025 Gasket, .75" x .06" x 2 feet R2074402 R2074402 R2074402 13.2.2 final assembly, Part numbers Final Assembly...
  • Page 94: Waterway Outlet Assembly

    Hinge mounting bracket, left 20N3163 30N3050 40N3163 Hinge mounting bracket, right 20N3164 30N3051 40N3164 Page 90 LAARS Heating Systems Panel, right, rain splatter 30N3053 30N3053 40N3050 Panel, left, rain splatter 30N3054 30N3054 40N3050 Bracket, hinge brace 30N3055 30N3055 30N3055 Panel, top left...
  • Page 95: Burner Assembly, Model 2000

    Door, right 20N3100 30N3100 40N3100 Door, left 20N3150 30N3150 40N3150 Control panel assemblies: MagnaTherm Boilers and Water Heaters Page 91 30N7080 30N7080 40N7080 MGH with CSD-1 30N7081 30N7081 40N7081 30N7082 30N7082 40N7082 MGV with CSD-1 30N7083 30N7083 40N7083 Condensate trap assembly 20N2010 30N2010 40N2010...
  • Page 96: Burner Assembly, Model 3000

    40N3100 40N3100 Door, left Door, left 20N3150 20N3150 30N3150 30N3150 40N3150 40N3150 Control panel assemblies: Control panel assemblies: Page 92 LAARS Heating Systems 30N7080 30N7080 30N7080 30N7080 40N7080 40N7080 MGH with CSD-1 MGH with CSD-1 30N7081 30N7081 30N7081 30N7081 40N7081...
  • Page 97: Burner Assembly, Model 4000

    2000 3000 MagnaTherm Boilers and Water Heaters Page 93 Item # Description Part No. Part No. Pipe, outlet manifold 20N4023 30N4020 PRV 75# (MGH) A0002700 A000030 PRV 125# (MGV) A0064400 A000020 Flow switch RE0013000 RE001300 Flow switch paddle????? E2255800 E225580 Well, immersion, 1/2"NPT RE2058300 RE205830...
  • Page 98 Page 94 LAARS Heating Systems Gas train assembly (models 2000 and 3000)
  • Page 99: Gas Train Assembly, Models 2000 & 3000

    Adapter 1/4" tube x 1/8" female P2090200 Blower tube 40N5077 MagnaTherm Boilers and Water Heaters Gasket, burner S2124600 Page 95 Ignitor, hot surface W2013900 Sight glass RF0044800 Flame sensor W2014000 13.2.7 Gas train assembly, Part numbers (models 2000 and 3000) Gas Train Assembly 2000 3000...
  • Page 100 Page 96 LAARS Heating Systems 70-236 PIPE PLUG, MA W2000300 VALVE, MANUA S2123500 WASHER, SEA P2089600 ADAPTER, FEMALE P2089300 ADAPTER, 1/4 TUB Gas train assembly (model 4000) 40N6040 GAS TRA 40N6031 GAS TRAIN V2022300 VALVE, Manual/QTY. BOM Table...
  • Page 101: Gas Train Assembly, Model 4000

    Nipple, 3/8"x3" P2090500 P2090500 Tee, 3/8x3/8x3/8 P2090600 P2090600 MagnaTherm Boilers and Water Heaters Page 97 Bushing, reducing, 3/8x1/8 P2090700 P2090700 Union P0030700 Nipple P2072800 Elbow P0008700 P0008700 Nipple P0015500 P0021200 13.2.8 Gas train assembly, Part numbers (model 4000) Nipple P0021200 P0021200 4000 Item #...
  • Page 102 Page 98 LAARS Heating Systems Control Panel assembly...
  • Page 103: Control Panel Assembly

    Tee, 3/8" P2090600 Bushing, 3/8"x1/8" P2090700 MagnaTherm Boilers and Water Heaters Page 99 Nipple, 3/8"x2" P2089000 Ball valve, 3/8" V2022200 Pilot regulator V2022100 Compression fitting, 1/4" tube x 1/4NPT P0004100 Pilot tube 40N6025 13.2.9 Control Panel assembly, Part numbers Control Panel Assembly 2000 3000 4000...
  • Page 104 (Customer Service and Product Support) 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130 www.Laars.com Printed in U.S.A. © Laars Heating Systems 1401 Document 1276...

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