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Laars MagnaTherm MGH1600 - User Manual

Laars MagnaTherm MGH1600
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Installation and Operation Instructions Document 1422
H2397100-
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualied in hot water boiler and heater installation and maintenance. Improper installation and/or operation
could create carbon monoxide gas in ue gases which could cause serious injury, property damage, or
death. Improper installation and/or operation will void the warranty.
20:1 Turndown. Laars Linc
®
WARNING
If the information in this manual is not
followedexactly,areorexplosionmayresult
causing property damage, personal injury or
loss of life.
Do not store or use gasoline or other
ammable 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 re department.
Installation and service must be performed by
a qualied installer, service agency, or gas supplier.
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 inammables 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 qualié ou par le
fournisseur de gaz.
HTD
Installation and Operation Instructions for
Modulating 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
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

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Installation And Operation Instructions For124 pages

Questions and Answers

  • W
    William WarrenSep 6, 2025
    What to do if Laars MagnaTherm MGH1600 shows internal fault: safety relay test failed due to safety relay not OFF?
    • A
      Amy EdwardsSep 6, 2025
      If your Laars Boiler displays an internal fault where the safety relay test failed because the safety relay is not OFF, which is caused by an internal fault, you can: 1. Reset the module. 2. If the fault repeats, replace the module.
  • F
    freemankristieAug 25, 2025
    What to do if Laars MagnaTherm MGH1600 Boiler flame lost early in run?
    • L
      Larry DavisAug 25, 2025
      If the flame is lost early during operation of your Laars Boiler, do the following: 1. Check the main valve wiring and operation, correcting any errors. 2. Ensure there is an adequate fuel supply. 3. Check the fuel pressure and repeat turndown tests. 4. Inspect the ignition transformer electrode, flame detector, flame detector siting, or flame rod position. 5. If the problem continues, consider replacing the module.
  • J
    James ReynoldsAug 25, 2025
    What to do if Laars MagnaTherm MGH1600 Boiler flame lost in MFEP?
    • S
      Susan BartlettAug 26, 2025
      If the flame is lost in MFEP (Main Flame Establishment Period) of your Laars Boiler, follow these steps: 1. Check the main valve wiring and its operation, correcting any errors. 2. Verify the fuel supply. 3. Check fuel pressure and repeat turndown tests. 4. Inspect the ignition transformer electrode, flame detector, flame detector siting, or flame rod position. 5. If the problem persists, consider replacing the module.
  • R
    Raymond CrawfordSep 15, 2025
    How to fix DHW (Domestic Hot Water) sensor fault on Laars MagnaTherm MGH1600?
    • J
      James ClaytonSep 15, 2025
      To resolve a 'DHW (Domestic Hot Water) sensor fault' in your Laars Boiler, begin by checking the wiring for any errors and correct them. If the problem persists, replace the DHW sensor. If the fault continues after these steps, replace the module.
  • M
    Mark GomezSep 23, 2025
    What does it mean when my Laars MagnaTherm MGH1600 is 'Waiting for safety data verification' and how can I fix it?
    • K
      kimberlysparksSep 23, 2025
      If your Laars Boiler is 'Waiting for safety data verification', it could be because the device is in Configuration mode and safety parameters need verification, requiring a device reset to complete verification. Alternatively, the configuration might have ended without verification. In this case, re-enter configuration, verify safety parameters, and reset the device to complete verification. If the fault persists, consider replacing the module.
  • S
    Stephanie GonzalezSep 12, 2025
    What to do if AC input phases are reversed in Laars Boiler?
    • M
      Mariah HopkinsSep 12, 2025
      To address AC input phases being reversed in your Laars Boiler: First, check the connections of the module and display. Next, ensure the module power supply's frequency and voltage meet the required specifications. For 24 VAC applications, confirm that J4 terminal 10 and J8 terminal 2 are connected.
  • A
    Alexis LeSep 2, 2025
    What to do if Laars MagnaTherm MGH1600 Boiler shows internal fault: zero crossing not detected?
    • A
      Abigail GonzalezSep 2, 2025
      If your Laars Boiler displays an internal fault indicating that zero crossing was not detected, which is caused by an internal fault, you can: 1. Reset the module. 2. If the fault repeats, replace the module.
  • E
    edward90Sep 2, 2025
    What to do if Laars Boiler shows internal fault: flame bias out of range?
    • K
      Kevin MooreSep 3, 2025
      If your Laars Boiler displays an internal fault indicating flame bias out of range, which is caused by an internal fault, you can: 1. Reset the module. 2. If the fault repeats, replace the module.
  • T
    troweSep 22, 2025
    What does 'Fan speed not proved' mean on my Laars MagnaTherm MGH1600?
    • C
      Charles NunezSep 22, 2025
      The message 'Fan speed not proved' on your Laars Boiler means hold only and will not be a lockout fault.
  • W
    William MccoyAug 29, 2025
    What to do if Laars Boiler shows invalid Delta T limit enable setting?
    • D
      Diana WalkerAug 29, 2025
      If your Laars Boiler displays an invalid Delta T limit enable setting: 1. Return to Configuration mode, recheck the selected parameters, re-verify, and reset the module. 2. If the fault repeats, verify electrical grounding. 3. If the fault persists, replace the module.

Laars MagnaTherm MGH1600 Specifications

General IconGeneral
ModelMagnaTherm MGH1600
Boiler TypeCondensing
Input BTU/hr1600000
Efficiency95%
Fuel TypeNatural Gas or Propane
Maximum Working Pressure160 psi
Output BTU/h1520000
Thermal Efficiency95%
Electrical Supply120V/60Hz/1 phase
Minimum Gas Supply Pressure - Natural Gas4.0" W.C.
Minimum Gas Supply Pressure - Propane10.0 inches w.c.
Vent Diameter8"

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