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
20:1 Turndown.
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
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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Summary of Contents for Laars MagnaTherm HTD Series
- Page 1 Installation and Operation Instructions Document 1422 Installation and Operation Instructions for 20:1 Turndown. Laars Linc ® Modulating 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 1,999 MBTU/h...
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Page 2: Table Of Contents
LAARS Heating Systems Table of Contents SECTION 1 General Information ......1 SECTION 5 Piping..........24 Introduction........... 1 Boiler Water Piping ......24 5.A.1 Boiler Water Connections ....24 Model Identification ......1 Warranty ..........1 5.A.2 Cold Water Make-Up ......24 Safety Notes ......... - Page 3 Section 8 (continued) 8.E.10 Both Model. OEM only...... 92 Configuration ........67 8.E.11 About About the Firmware version. .. 92 8.D.1 CH ............. 68 8.E.12 LMV ............ 92 8.D.1.a CH1 ............ 68 Messages and USB......93 8.D.1.a.1 Enable/Disable ........68 8.F.1 Messages ...........
- Page 4 LAARS Heating Systems...
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Page 5: Section 1 General Information
1.A Introduction This manual includes information which will help you LAARS Heating Systems MagnaTherm HTD boilers and to install, operate, and maintain the Laars Heating volume water heaters are covered by a limited warranty. 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
Page 2 LAARS Heating Systems 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.
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Page 8: E Unit Overview
Page 4 LAARS Heating Systems 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 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
Page 6 LAARS Heating Systems 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 Page 7 Air Inlet 2” Gas ALL Sizes Touchscreen Display Valve Pressure Relief Valve Water Outlet Water Inlet Vent Op�onal Flanges, Contact Factory FRONT SIDE SIDE FRONT Condensate Trap VIEW VIEW VIEW VIEW 1” Drain Hose on ALL Sizes Air Inlet 2”...
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Page 12: I Unpacking
Page 8 LAARS Heating Systems Unpacking 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 See Table 2 for Suggested Service Top earances Clearances 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
Page 10 LAARS Heating Systems 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 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 collect anywhere in the vent system - including in the flue gas sampling port. -
Page 16: C Vent And Air Pipe Sizing
CA012202 CA012203 CA012203 Screen for vertical galvanized air pipe D2012204 D2012201 D2012201 D2012202 D2012203 D2012203 Page 12 LAARS Heating Systems Screen for vertical PVC air pipe CA012404 CA012401 CA012401 CA012402 CA012403 CA012403 Screen for vertical polypropylene air pipe CA012604 CA012601... -
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
Page 14 LAARS Heating Systems 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 In the United States, the most common requirements specify that the space shall communicate with the Boilers and water heaters must have provisions for outdoors in accordance with Method 1 or 2. (See the combustion and ventilation air in accordance with the following descriptions.) Where ducts are used, they shall applicable requirements for Combustion Air Supply and... -
Page 20: C.5.B Ducted Combustion Air
Page 16 LAARS Heating Systems 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)
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Page 22: Side-Wall Combustion Air Terminal
Page 18 LAARS Heating Systems 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 12” Above expected snow line expected snow line. -
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
Page 20 LAARS Heating Systems 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 Page 21 1,900 3,020 5,350 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 And 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 turndown, meaning it modulates from 5% to 100% of generally used in closed systems, so Laars bases (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
Page 24 LAARS Heating Systems 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 • Hercules Chemical Company This boiler is a high efficiency appliance. Boiler 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 Page 26 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 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 Page 28 LAARS Heating Systems 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.
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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
Page 30 LAARS Heating Systems 5.B.4 Freeze Protection 5.B.5 Suggested Piping Schematics If installing outdoors in a location that may experience This heater is a high efficiency appliance. Heater freezing temperatures, precautions must be taken to efficiency can be maximized by using piping... - 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.
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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” concrete platform. This will generally allow sufficient elevation for the condensate neutralizer to be installed below the condensate trap. -
Page 37: Section 7 Electrical Connections
Page 33 SECTION 7 Electrical Connections 7.A Installation Warnings CAUTION CAUTION Label all wires prior to disconnection when servicing The supply voltage to this unit must not be controls. Wiring errors can cause improper and disconnected, except for service or isolation, or unless otherwise instructed by procedures outlined dangerous operation. -
Page 38: Control Panel Layout
Page 34 LAARS Heating Systems Shown with outside panels 7.B Main Power Connections removed for full servicing. Hinged control panel swings open for This unit is provided with an electrical servicing and setup junction box in the rear panel for main power connections. -
Page 39: Field Connections
Page 35 7.C Control Panel Layout LMV Controller Assembly Power Supply, VCS Series AC/DC Control Fuel - Air Linc Ratio, Siemens Controller LMV/36 Assembly Terminal Block O2 Sensor RUN RELAY CASCADE 120 VAC 24 VAC POWER OUTPUTS DRY CONTACTS SENSOR INPUTS HEAT DEMANDS ANALOG ANALOG... -
Page 40: Temperature Sensors
Page 36 LAARS Heating Systems NOTE: When running the Power and Field the DHW temperature drops below the DHW set point Connection wirings between the units (Lead by the value of the DHW On Hysteresis (DHW Set Point Lag, System Sensor, Outdoor Sensor, Building –... -
Page 41: Analog In And Analog Out
Page 37 Figure 21. Jumper locations at the inputs 7.D.6 Dry Contacts. Run & Alarm Run - when used, is connected to terminals 51 TT2 – if an additional thermostat/aquastat or end switch (common), 52 (normally closed), and 53 (normally open) (isolated contact only) is required as a heat demand, (See Figure 19 on page 35). -
Page 42: Rs 485, Cascade
Page 38 LAARS Heating Systems 7.D.7 RS 485, Cascade Cascade - Prior to wiring units for cascade operations, select one unit as the lead boiler/heater. Other units connected to the lead boiler/heater will be referred to as lag units. Communication between lead and lag units is accomplished using RS485. -
Page 43: Modbus To Bacnet Memory Map
Page 39 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 44 Page 40 LAARS Heating Systems 7.E Modbus and BACnet memory displays (continued) Modbus BACnet BACnet Address Type Map Descriptor Name Data Type Object ID Read/Write Notes Read History - DHW Pump Cycles Read Read History - System Pump Cycles Read...
- Page 45 Page 41 Modbus BACnet BACnet Address Type Map Descriptor Name Data Type Object ID Read/Write Notes 245 = Trial for Ignition 250 = Trial for Ignition Main 52=Post Purge Read Boiler Pump Status Read Read Cascade Master Heat Demand Read Read Burner 1 Run Time Read...
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Page 46: Wiring Diagrams
Page 42 LAARS Heating Systems Wiring Diagrams X3-03 X3-05 X6-03 X4-02 X7-02 X9-04 X5-01 X5-02 WIRING DIAGRAM 1.6 HTD Figure 22. Wiring Diagram, Model 1600... - Page 47 Page 43 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 48 Page 44 LAARS Heating Systems X3-05 X6-03 X4-02 X7-02 X9-04 X5-01 X5-02 X3-03 Figure 23. Wiring Diagram, For Models 2000 and larger...
- Page 49 Page 45 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 panel.
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Page 50: High Voltage Wiring Diagrams
Page 46 LAARS Heating Systems 7.G High Voltage Wiring Diagrams Figure 24. High Voltage Wiring Diagram Model 1600, 120V... - Page 51 Page 47 Figure 25. High Voltage Wiring Diagram Model 1600, 208V Single Phase...
- Page 52 Page 48 LAARS Heating Systems 7.J High Voltage Wiring Diagrams (continued) Figure 26. High Voltage Wiring Diagram Model 1600, 220V / 240V Single Phase...
- Page 53 Page 49 Figure 27. High Voltage Wiring Diagram Model 2000, 120V...
- Page 54 Page 50 LAARS Heating Systems 7.J High Voltage Wiring Diagrams (continued) 120V N 120V N 120V H 120V H Figure 28. High Voltage Wiring Diagram Model 2000, 208V Single Phase...
- Page 55 Page 51 Figure 29. High Voltage Wiring Diagram Model 2000, 220V / 240V Single Phase...
- Page 56 Page 52 LAARS Heating Systems 7.J High Voltage Wiring Diagrams (continued) 120V N 120V N 120V H 120V H Figure 30. High Voltage Wiring Diagram Model 2000 - 4000 Three Phase...
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Page 57: Ladder Diagrams
Page 53 7.H Ladder Diagrams Figure 31. Model 1600 120V Ladder Diagram... - Page 58 Page 54 LAARS Heating Systems 7.K Ladder Diagrams (continued) Figure 32. Model 1600, 208V, Single Phase, Ladder Diagram...
- Page 59 Page 55 Figure 33. Model 1600, 220V / 240V Single Phase Ladder Diagram...
- Page 60 Page 56 LAARS Heating Systems 7.K Ladder Diagrams (continued) Figure 34. Model 2000, 120V Ladder Diagram...
- Page 61 Page 57 Figure 35. Model 2000, 208V, Single Phase, Ladder Diagram...
- Page 62 Page 58 LAARS Heating Systems 7.K Ladder Diagrams (continued) Figure 36. Model 2000, 220V / 240V Single Phase Ladder Diagram...
- Page 63 Page 59 Figure 37. Three-Phase Ladder Diagram...
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Page 64: Section 8 Control Operation
Page 60 LAARS Heating Systems 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 62 Touchscreen Display. -
Page 65: Keypad Operations
Page 61 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 66: B Login To Lock / Unlock The Display
Page 62 LAARS Heating Systems 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 67: C Quick Start
Q U I C K S T A R T Page 63 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. To navigate to the Quick Start Screen, touch the Quick Start Icon in the lower left portion of the Home Screen. -
Page 68: Quick Start
Q U I C K S T A R T Page 64 LAARS Heating Systems 8.C.2.a CH1 • Enable/Disable – This allows CH1 to be enabled/disabled. The default setting is Enabled. • Set Point – This is the set point temperature. -
Page 69: Outdoor Reset
Q U I C K S T A R T Page 65 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 70: Anti-Short Cycle
Q U I C K S T A R T Page 66 LAARS Heating Systems 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 71: D Configuration
C O N F I G U R A T I O N Page 67 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 72: D.1.A Ch1
C O N F I G U R A T I O N Page 68 LAARS Heating Systems 8.D.1 “CH” stands for “Central Heat.” It is used for space heating demands. On the Configure Screen, touch the CH thermometer icon to navigate to the CH Selection Screen There are two identical heat demands, CH1 and CH2, each with independent control algorithms and independent inputs on the input terminal strip, see 7.D.4 on page 36... -
Page 73: D.1.A.3 Pid Parameters
C O N F I G U R A T I O N Page 69 8.D.1.a.3 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 74: Outdoor Reset
C O N F I G U R A T I O N Page 70 LAARS Heating Systems 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 75: Cascade
C O N F I G U R A T I O N Page 71 8.D.4 Cascade An installation with two or more units may be configured for cascade operation. Up to eight units can be cascaded and controlled together. To navigate to the Cascade Screen, touch the Cascade Icon on the Configuration Screen. -
Page 76: D.4.A Cascade Ch
C O N F I G U R A T I O N Page 72 LAARS Heating Systems 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 77: D.4.A.1 Cascade Ch Lead Settings
C O N F I G U R A T I O N Page 73 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 78: D.4.B Cascade Dhw
Page 74 LAARS Heating Systems 8.D.4.c.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. Drop Load – As the demand for heat decreases, this is the firing rate that units turn off. The last unit to fire is the first to get turned off. -
Page 79: D.4.D Redundancy
C O N F I G U R A T I O N Page 75 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. The Cascade Redundancy Screen allows the selection of one of three options for redundancy in cascade systems. -
Page 80: Pumps
C O N F I G U R A T I O N Page 76 LAARS Heating Systems 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 81: D.6.A Dhw Recirculation
C O N F I G U R A T I O N Page 77 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. • Set Point – With DHW Recirculation enabled, the DHW Pump output will be energized once the DHW temperature drops below the set point minus the On Hysteresis (Set Point –... -
Page 82: Manual Firing Rate
C O N F I G U R A T I O N Page 78 LAARS Heating Systems 8.D.7 Manual Firing Rate To navigate to the Manual Firing Rate Screen, touch the Manual Firing Rate Icon on the Configuration Screen. -
Page 83: D.8.A Delta T Parameters
C O N F I G U R A T I O N Page 79 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. The Delta T Parameters Screen allows adjustment of the following parameters: •... -
Page 84: External
C O N F I G U R A T I O N Page 80 LAARS Heating Systems 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 85: D.9.A External - Remote Set Point
C O N F I G U R A T I O N Page 81 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 86: D.9.B External Firing Rate
C O N F I G U R A T I O N Page 82 LAARS Heating Systems 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. -
Page 87: Miscellaneous Features
C O N F I G U R A T I O N Page 83 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 88: D.11.A Demand Priority
C O N F I G U R A T I O N Page 84 LAARS Heating Systems 8.D.11.a Demand Priority To navigate to the Demand Priority Screen, first go to the Miscleaneous folder. At the Demand Priorities screen select each configured demand and assign a priority number. -
Page 89: D.11.C Warm Weather
C O N F I G U R A T I O N Page 85 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 90: D.11.D Com Port, Bms
C O N F I G U R A T I O N Page 86 LAARS Heating Systems 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. -
Page 91: D.11.E Temperature Conversion
C O N F I G U R A T I O N Page 87 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 92: D.11.G Trim (Enable / Disable)
C O N F I G U R A T I O N Page 88 LAARS Heating Systems 8.D.11.g 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 93: E Service Screens
S E R V I C E Page 89 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. 8.E.1 Burner Navigate to the Burner Screen by touching the Burner Button on the Service Screen. -
Page 94: Digital I/O ( Input / Output )
S E R V I C E Page 90 LAARS Heating Systems 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. -
Page 95: Analog I/O
S E R V I C E Page 91 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. Analog I/O Input: There are three types of analog inputs;... -
Page 96: Screen Settings Timeout
S E R V I C E Page 92 LAARS Heating Systems 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. -
Page 97: Restart Touchscreen & Recalibrate
S E R V I C E Page 93 8.E.6 Restart Touchscreen & Recalibrate Touching the Restart Button on the Service Screen reboots the display. If the touchscreen seems to be out of alignment, it can be recalibrated by pressing the Restart Button, promptly touching (and holding) the touch screen. Follow the calibration procedure as shown on the touch screen. -
Page 98: Messages And Usb
Page 94 LAARS Heating Systems Messages and USB 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 99: Active Demands
Page 95 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 set point, but remains active. -
Page 100: Section 9 Parameter Tables
Page 96 LAARS Heating Systems SECTION 9 Parameter Tables (MGH and MGV) Table 20. 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... - Page 101 Page 97 Boilers Boilers Minimum Minimum Maximum Maximum Default Default Unit Unit 100% Base Load 100% Drop Load 30 secs 600 secs 60 secs Min On Time Seconds Min Off Time 30 secs 600 secs 30 secs Seconds Cascade Redundancy Boiler Internal Setpoint/ Loss of Lead Setup Disable...
- Page 102 Page 98 LAARS Heating Systems Boilers Minimum Maximum Default Unit 100% 100% Maximum Firing Rate 100% Minimum Firing Rate 100% 100% Demand Max Demand Min 100% Demand On Demand Off Input Type 0-10 VDC/ 4-20 mA 0-10 VDC VDC/mA Anti- Frost Pump Only/ Pump &...
- Page 103 Page 99 Table 21. MGV (Volume Water Heaters) Parameter and Range Table (includes next 2 pages) Heater Minimum Maximum Default Units Time & Date Hour Hour Minute Minute Month Month Year Year DHW1 Disable Enable Enable DHW1 Enable/Disable 40 F 200 F 180 F DHW1 Setpoint...
- Page 104 Page 100 LAARS Heating Systems Heater Minimum Maximum Default Units Boiler Internal Setpoint/ Disable Disable Loss of Lead Setup Redundant Lead Hybrid Disable Enable Disable Hybrid Enable/Disable Disable Enable Disable Hybrid Lag Mode Hybrid Setpoint 80 F 180 F 130 F °F/C...
- Page 105 Lag Off Hysteresis Demand Max 20 F 100% 10 F 100% °F/C 40 F 200 F 100% 140 F Cascade DHW Setpoint Demand Min °F/C Cascade DHW Proportional Gain Demand On Page 101 Cascade DHW Integral Time Demand Off Seconds 0-10 VDC / 4-20mA 0-10 VDC Cascade DHW Derivative Time...
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Page 106: Section 10 Initial Startup Instructions
Page 102 LAARS Heating Systems 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 107: Initial Operation
Page 103 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. can be due produced. -
Page 108: Combustion Setup Procedure
Page 104 LAARS Heating Systems 10.B.2 Combustion Setup Procedure 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. -
Page 109: Shutting Down The Unit
Page 105 6. Once the high fire is set, adjust the Manual Firing 4. Provide a call for heat to terminals TT-1 and allow Rate to 5% the system to sequence to the Run State. Once in Run and firing at 100%, using a combustion 7. -
Page 110: Operation
Page 106 LAARS Heating Systems 10.E Operation displayed on the touchscreen. A manual reset This unit utilizes three (3) separate controllers to is required to restart the system once the fault manage system functions, burner management and air/ condition has been corrected. -
Page 111: Section 11 Maintenance
Page 107 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 112: Controller
Page 108 LAARS Heating Systems After the valve has been removed, reassemble in supply to the boiler. Turn off all manual gas valves reverse order making sure to include all gaskets and connecting the boiler to the main gas supply line. Open O-rings. -
Page 113: Heat Exchanger Tubes
Page 109 11.B.8 Heat Exchanger Tubes 8. To place the unit back in operation, install all Black carbon soot build-up on the external surfaces removed components in the reverse order. Be sure of the heat exchanger is caused by one or more of all gaskets are in place as the components are the following: incomplete combustion, combustion air installed. -
Page 114: Section 12 Troubleshooting
Page 110 LAARS Heating Systems SECTION 12 Troubleshooting 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 •... - Page 115 Page 111 Condition Information Corrective Action Flow Switch • Insufficient flow at the outlet of the • Faulty boiler/heater pump – replace pump. Outlet • Dual element sensor readings do not • Check the sensor and wiring. Repair or replace as needed. boiler/heater Faulty pump contactor –...
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Page 116: Section 13 Replacement Parts
Page 112 LAARS Heating Systems SECTION 13 Replacement Parts Use only genuine Manufacturer replacement parts. 13.A General Information To order or purchase parts, contact your nearest manufacturers dealer or distributor. (See the back cover of this manual for the manufacturers website). -
Page 117: Part Numbers
Page 113 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 R16N2190 R20N2190 R30N2190 R30N2190 R40N2190 R40N2190 LOW AIR PRESSURE SENSOR, SHINEUI RE2389700 RE2389700 RE2389700... - Page 118 PART NO. CONTROLLER ASSY, O2 SENSOR R30N7089 PANEL ASSY, CONTROL, MGT R30N7092 TRAY, DIAGNOSTIC HANDSET, PROJECT #0014 R30N7094 CONTROLLER ASSY, LAARS LINC® R30N7096 LABEL, CONTROL PANEL, MGT RH2363500 SWITCH, CUTOFF, LOW WATER RE2075100 LMV, PROGRAMMED, SEE DRAWING XN7110 FOR CORRECT PGM RXN7110-**** HANDSET, DISP &...
- Page 119 Page 115 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 R16N5062 R20N5037 R30N5037 R30N5037 R30N5037 R30N5037 VALVE-ACTUATOR ASSY, SIEMENS RV2028300...
- Page 120 Page 116 LAARS Heating Systems 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 121 Page 117 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 DETAIL SCALE 1 : 4 PILOT TUBE TO BURNER...
- Page 122 Page 118 LAARS Heating Systems 13.B.4 AC Distribution Box Assemblies and Part Numbers (Model 1600) MGT 1.6 HTD ITEM# DESCRIPTION 120V 240V 208V BUSHING, NYLON, 7/8, SLIT RS0064900 RS0064900 RS0064900 GFCI RECEPTACLE, NEMA 5-15, IVORY, BOX MOUNT RE2355400 RE2355400 RE2355400...
- Page 123 Page 119 13.B.5 AC Distribution Box Assemblies and Part Numbers (Model 2000) MGT 2.0 HTD ITEM# DESCRIPTION 120V 240V 208V 1n 208V 3n 480V 600V BUSHING, NYLON, 7/8, SLIT RS0064900 RS0064900 RS0064900 RS0064900 RS0064900 RS0064900 GFCI RECEPTACLE, NEMA 5-15, IVORY, BOX MOUNT RE2355400 RE2355400 RE2355400...
- Page 124 Page 120 LAARS Heating Systems 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 RS0064900 RS0064900 RS0064900 RS0064900 RS0064900 RS0064900 BUSHING, NYLON, 7/8, SLIT...
- Page 125 Page 121 13.B.7 Waterway Inlet Assembly, Part Numbers Waterway Inlet Assembly, Part Numbers Part Number by Boiler Size Part Number by Boiler Size Item Item Description Description 1600 1600 2000 2000 2500 2500 3000 3000 3500 3500 4000 4000 Weldment, Waterway Inlet Weldment, Waterway Inlet R20N4026 R20N4026...
- Page 126 Page 122 LAARS Heating Systems 13.B.8 Waterway Outlet Assembly, Part Numbers Waterway Outlet Assembly, Part Numbers Part Number by Boiler Size Item # Description 1600 2000 2500 3000 3500 4000 Pipe Weldment, Outlet R20N4023 R20N4023 R20N4023 R20N4023 R40N4020 R40N4020 PRV 75# (MGH)
- Page 127 Page 123 13.B.9 Model 1600 Gas Train Assembly REMOVE PLUG FROM VALVE FOR BOM CONFIGURATION 16N6011 1600 ITEM DESCRIPTION PART NO. VALVE-ACTUATOR ASSY, GAS, VA SERIES, VKG, 1" NPT RV2025500 ACTUATOR, ELECTRO-HYDRAULIC, SKP25.011U1 RV2025400 VALVE BODY, SINGLE GAS, 1-1/2 NPT, HW VGG10.404U RV2025200 VALVE, GAS, SOLENOID, NC SAFETY SHUTOFF, 1-1/2"...
- Page 128 Page 124 LAARS Heating Systems 13.B.10 Gas Train Assembly, Model 2000 1600 ITEM DESCRIPTION PART NO. VALVE-ACTUATOR ASSY, GAS, VA SERIES, VKG, 1" NPT RV2025500 ACTUATOR, ELECTRO-HYDRAULIC, SKP25.011U1 RV2025400 VALVE BODY, SINGLE GAS, 1-1/2 NPT, HW VGG10.404U RV2025200 VALVE, GAS, SOLENOID, NC SAFETY SHUTOFF, 1-1/2" NPT...
- Page 129 Page 125 13.B.11 Gas Train Assembly, Model 2500 & 3000 1600 ITEM DESCRIPTION PART NO. REMOVE PLUG VALVE-ACTUATOR ASSY, GAS, VA SERIES, VKG, 1" NPT RV2025500 FROM VALVE FOR BOM CONFIGURATION ACTUATOR, ELECTRO-HYDRAULIC, SKP25.011U1 RV2025400 30N6011 VALVE BODY, SINGLE GAS, 1-1/2 NPT, HW VGG10.404U RV2025200 VALVE, GAS, SOLENOID, NC SAFETY SHUTOFF, 1-1/2"...
- Page 130 MagnaTherm Boilers and Water Heaters Notes:...
- Page 131 MagnaTherm Boilers and Water Heaters Notes:...
- Page 132 Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355 Headquarters: If the mark MUST re the PMS® 300 mark, 9 Brigden Gate, Halton Hills, Ontario, Canada L7G 0A3 (905) 203-0600 Fax: (905) 636-0666 white outline. www.Laars.com Litho in U.S.A. © Laars 1907 Document 1422...
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