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Installation and Operation Instructions
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water boiler and heater installation and maintenance. Improper installation and/or operation
could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or
death. Improper installation and/or operation will void the warranty.
If the information in this manual is not
followed exactly, a fire or explosion may result
causing property damage, personal injury or
loss of life.
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of
this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from a
nearby phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call
the fire department.
Installation and service must be performed by
a qualified installer, service agency, or gas supplier.
WARNING
Installation and Operation
Instructions for
with Touchscreen
Modulating Boilers and
Volume Water Heaters
NT2(H,V) 399
NT2(H,V) 500
NT2(H,V) 650
NT2(H,V) 800
NT2(H,V) 999
NT2(H,V) 1500
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
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 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 1475A
®
MBTU/h
MBTU/h
MBTU/h
MBTU/h
MBTU/h
MBTU/h
AVERTISSEMENT
blessure ou la mort.
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Summary of Contents for Laars NeoTherm XTR Series
- Page 1 Installation and Operation Instructions Document 1475A Installation and Operation Instructions for ® with Touchscreen Modulating Boilers and Volume Water Heaters NT2(H,V) 399 MBTU/h NT2(H,V) 500 MBTU/h NT2(H,V) 650 MBTU/h NT2(H,V) 800 MBTU/h NT2(H,V) 999 MBTU/h NT2(H,V) 1500 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.
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Page 2: Table Of Contents
LAARS Heating Systems Table of Contents SECTION 1 GENERAL INFORMATION SECTION 6 WATER PIPING Introduction ............4 Install the PRV & Temp/Pressure Gauge ..31 Warranty ............4 Boiler Piping ..........31 Rating Plate ............4 6.B.1 Boiler Cold Water Make-Up ......31 Model Identification ........... - Page 3 XTR Commercial Boilers and Water Heaters HERM 9.F.1 Messages ............91 9.C.6 Time & Date ........... 60 9.F.2 USB Functionality ........... 91 Configuration ..........61 Active Demands ..........92 9.D.1 CH (Central Heat) ........... 62 9.D.1.a CH1 (Central Heat, One) 1 ......62 9.D.1.a.1 PID Low ............
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Page 4: Section 1 General Information
SECTION 1 GENERAL INFORMATION 1.A Introduction 1.B Warranty Laars Heating Systems NeoTherm XTRs are covered This manual provides information necessary for the by a limited warranty. The owner should complete the installation, operation, and maintenance of Laars warranty registration at www.Laars.com. -
Page 5: D Model Identification
Page 5 XTR Commercial Boilers and Water Heaters HERM 1.D Model Identification Consult the Rating Plate on the back of the unit. The following information describes the Model Identification (Model Nomenclature). (11) Options (1-3) Model Series Designation N = Normal Water Pump N T 2 = NeoTherm XTR X = No pump Usage... -
Page 6: E Safety Notes
Page 6 LAARS Heating Systems Safety Notes Safety notes are used throughout this manual to bring attention to the presence of hazards with various risk levels and to off er important information concerning the life of this product. There are 3 basic types. - Page 7 Electrical shock can cause severe injury, death or property damage. Disconnect the power supply before beginning installation or changing the wiring to prevent ATTENTION Page 7 XTR Commercial Boilers and Water Heaters electrical shock or damage to the equipment. It may be HERM Le CO doit être inférieur à...
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Page 8: F Model Overview
Page 8 LAARS Heating Systems Model Overview The locations of components are similar across each model size. Access to all components can be made through the access panels at the front, top, and rear. PRESSURE CONNECTION RELIEF VALVE TOP ACCESS PANEL... - Page 9 Page 9 XTR Commercial Boilers and Water Heaters HERM Figure 4. Models 650 - 850 SHOWN WITH FRONT, SIDE, AND CONTROL PANELS REMOVED TO SIMPLIFY THE VIEW Figure 5. Models 999 - 1500...
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Page 10: G Dimensions
Page 10 LAARS Heating Systems THIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE PROPRIETARY TO LAARS HEATING SYSTEMS CO. AND SHALL NOT BE ON / OFF REPRODUCED, TRANSFERRED TO OTHER DOCUMENTS, USED OR DISCLOSED TO OTHERS FOR MANUFACTURING OR ANY OTHER... - Page 11 Page 11 XTR Commercial Boilers and Water Heaters HERM Dimensions (continued) A (over-all) A (over-all) inch inch OUTLET OUTLET INLET INLET TOP VIEW POWER ELECTRICAL TOP VIEW POWER ELECTRICAL SWITCH SWITCH CONNECTIONS CONNECTIONS CONNECTION CONNECTION 52 3 DRAIN 52 3 DRAIN VENT VENT...
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Page 12: Section 2 Locating The Unit
Page 12 LAARS Heating Systems SECTION 2 LOCATING THE UNIT 2.A Removing a boiler from an Existing Common Vent NOTE: This section does not describe a method for common venting this unit. It describes what must be done when a unit is removed from a common vent system. -
Page 13: B Unpacking And The Install Kit
Page 13 XTR Commercial Boilers and Water Heaters HERM 2.B Unpacking and the Install Kit The location for the unit should be chosen with regard to the vent pipe lengths and external plumbing. When This unit is shipped in a single crate. Carefully venting vertically, the unit must be located as close disassemble the crate and inspect the unit for any as practical to the vertical section of the vent. -
Page 14: Clearances
Page 14 LAARS Heating Systems Outdoor Installation (continued) VENT SCREEN APPROVED TERMINATION Model Outdoor Kit (FIELD SUPPLIED) CA023300 COUPLING COUPLING CA022800 (FIELD SUPPLIED) CA022900 CA023000 CA023100 1500 CA023200 VENT PIPE (FIELD SUPPLIED) Outdoor Installation Kits Table 2. The outdoor installation kit includes... -
Page 15: Venting Safety Warnings
Page 15 XTR Commercial Boilers and Water Heaters HERM 3.A.1 Venting Safety Warnings WARNING WARNING If the unit is installed within a residential living space All venting must be installed according to this manual and or home, the installer must confirm that at least one any other applicable local codes, including but not limited to: carbon monoxide alarm has been installed following the ANSI Z223.1/NFPA 54, CSA B149.1, CSA B149.2 and ULC... -
Page 16: C Approved Materials
Page 16 LAARS Heating Systems 3.C Approved Materials This unit requires a special venting system. The manufacturers, materials, and product lines listed in this section are approved to safely operate with this equipment. Suppliers of stainless steel and polypropylene venting that are not listed on these tables are not permitted for use with this appliance. -
Page 17: Pvc/Cpvc
Page 17 XTR Commercial Boilers and Water Heaters HERM Polypropylene 3.C.2 3.C.1 PVC/CPVC Model sizes 399, 500, 650, 800, and 999 are designed The following polypropylene vent manufacturers and to accept PVC/CPVC vent material, so if venting with models are approved for use with the unit. PVC or CPVC on these models, no boiler adapter is required. -
Page 18: Stainless Steel
Page 18 LAARS Heating Systems Polypropylene (continued) Duravent PolyPro Centrotherm InnoFlue Z-Flex Z-Dens Boiler Air Intake Vent Boiler Air Intake Vent Boiler Air Intake Vent Model Adapter Termination Termination Adapter Termination Termination Adapter Termination Termination 4PPS- 4PPS- ISAAL0 ISELS0487 2ZDCP... - Page 19 Page 19 XTR Commercial Boilers and Water Heaters HERM Stainless Steel (continued) Duravent FasNSeal Heat Fab Saf-T Vent EZ Seal Model Boiler Air Intake Vent Boiler Air Intake Vent Terminations Adapter Terminations Terminations Adapter Terminations FSA-4PVCS- FSELB9004 9414TERM FSBS4 9401PVC 9492 399 - 500 4FNSF...
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Page 20: D Sizing
Page 20 LAARS Heating Systems 3.D Sizing This unit is certified to vent as a Category IV or Category II appliance. Because Category II vent is non-positive, the vent size may not be the same as the positive pressure Category IV vent, even when the unit is the same size. -
Page 21: Category Ll Vent Sizing
5 + Elbows (up to 6) x = # 90 s 5ft Page 21 XTR Commercial Boilers and Water Heaters HERM + Elbows (after first 6) x = # addt’l See s table # + Elbows x = s ... -
Page 22: E Air For Combustion And Ventilation
Page 22 LAARS Heating Systems Air for Combustion and Ventilation 3.E.2 Ducted Combustion Air The combustion air can be taken through the wall, or Boilers and water heaters must have provisions for through the roof. When taken from the wall, a field- combustion and ventilation air in accordance with supplied elbow must be used as a termination. -
Page 23: Locating Terminations
12” Min. Page 23 XTR Commercial Boilers and Water Heaters HERM Locating Terminations Vent 3.F.1 Side Wall Terminations Locate side wall terminals according to the following: 1. The vent must terminate in either a straight coupling, elbow, or an approved vent termination listed in this Screen manual. -
Page 24: F.1.B Side Wall Concentric Terms (399 - 500 Only)
Page 24 LAARS Heating Systems Side Wall Low Profile Terminations 3.F.1.b Side Wall Concentric Terminations 3.F.1.a (399 – 500 Models Only) (399 – 500 Models Only) In addition to the side wall location requirements of In addition to the side wall location requirements of 3.F.1, the following must also be considered when... - Page 25 Page 25 XTR Commercial Boilers and Water Heaters HERM Canadian Installations U.S. Installations A = Clearance above grade, veranda, porch, deck, or balcony B = Clearance to window or door that may be ● 6 in (15 cm) for appliances ≤ 10,000 Btuh (3 kW) ●...
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Page 26: Vertical Terminations
Page 26 LAARS Heating Systems 3.F.2 Vertical Terminations Air Intake Locate vertical terminals according to the following: Vent 12” Min vertically 1. The vent must terminate in a straight length of from vent outlet to pipe or coupling. Do not use a rain/vent cap for a any air inlet vent termination. -
Page 27: G Installations In The Comnwlth Of Massachusetts
Page 27 XTR Commercial Boilers and Water Heaters HERM SECTION 4 Installations in the Commonwealth GAS SUPPLY AND PIPING of Massachusetts In Massachusetts the following items are required if the 4.A Gas Supply and Piping. side-wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, All Installations must conform to the National Fuel including but not limited to decks and porches. -
Page 28: B Gas Pipe Sizing
Page 28 LAARS Heating Systems WARNING NOTE: This appliance and all other gas appliances sharing the gas supply line must be firing at Do not use an open flame to check for leaks. An maximum capacity to properly measure the inlet open flame could lead to explosion, which could result supply pressure. -
Page 29: A Boiler Flow And Head Requirements
Page 29 XTR Commercial Boilers and Water Heaters HERM SECTION 5 PUMP REQUIREMENTS 5.A Boiler Flow and Head Requirements Temperature Rise ( Model Flow Flow Flow Flow Flow 10.8 12.0 12.2 13.3 15.0 1500 35.2 15.7 Temperature Rise ( Model Flow Flow Flow... -
Page 30: C Water Heater Recovery Data
Page 30 LAARS Heating Systems 5.C Water Heater Recovery Data Required Water Temperature Rise ( Model 1149 1440 1152 1872 1498 1248 1070 2304 1843 1536 1317 1152 1024 2877 2302 1918 1644 1439 1279 1151 1500 4320 3456 2880... -
Page 31: Section 6 Water Piping
Page 31 XTR Commercial Boilers and Water Heaters HERM SECTION 6 WATER PIPING 6.B Boiler Piping 6.A Install the Pressure Relief Valve and Temp/Pressure Gauge NOTE: This appliance must be installed in a closed pressure system with a minimum of 12 psi (82.7kPa) static pressure at the boiler. -
Page 32: Freeze Protection
Page 32 LAARS Heating Systems appliances where they may be exposed to refrigerated WARNING air circulation must be equipped with flow control valves Glycol must not be used in domestic hot water or other automatic means to prevent gravity circulation of the boiler water during the cooling cycle. - Page 33 Page 33 XTR Commercial Boilers and Water Heaters HERM 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. Hydronic Piping — Single Boiler, Zoning with Circulators Figure 21.
- Page 34 Page 34 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. Hydronic Piping — Single Boiler, Low Temp Radiant Space Heating Using Low Loss Header Figure 22.
- Page 35 Page 35 XTR Commercial Boilers and Water Heaters HERM 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. Hydronic Piping — Multiple Boilers, Figure 23.
- Page 36 Page 36 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. Hydronic Piping — Multiple Boilers, Reverse Return, Multi-Temp Zones, Zoning with Circulators...
- Page 37 Page 37 XTR Commercial Boilers and Water Heaters HERM Hydronic Piping — Heating Zones with Indirect DHW Tank Piped with Zone Pumps Figure 26. The indirect DHW tank is piped directly off of the boiler.
- Page 38 Page 38 LAARS Heating Systems Figure 27. Hydronic Piping, Multiple Boilers with Indirect DHW Off of One Boiler...
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Page 39: C Water Heater Piping
Page 39 XTR Commercial Boilers and Water Heaters HERM 6.C Water Heater Piping Cold Water Make-Up 6.C.3 6.C.1 Water Quality The cold water make-up may be connected to the tank Water heaters must be installed in water conditions or to the inlet of the boiler as shown in Figure 28 through of 15 gpg hardness or less with a pH range of 6.5 to Figure 31 on page Install back flow preventers... - Page 40 Page 40 LAARS Heating Systems NOTE: This drawing is a schematic NOTES: representation of a piping style and is 1. Optional Cold Water Supply & Recirc location. not intended to be used as a working 2. Locate Heater DHW sensor or installation drawing.
- Page 41 Page 41 XTR Commercial Boilers and Water Heaters HERM NOTES: 1. Optional Cold Water Supply & Recirc location. 2. Locate Heater DHW sensor or remote aquastat well in lower 1/3 of tank. 3. Back flow preventer may be required - check local codes.
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Page 42: Section 7 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 Figure 33. Condensate Trap Components to install the boiler or water heater on a raised 4”... -
Page 43: A Installation Warnings
Page 43 XTR Commercial Boilers and Water Heaters HERM SECTION 8 8.B Main Power Ratings All units are powered by 120 volts. Refer to the tables INSTALLATION AND WIRING below for current ratings. 8.A Installation Warnings Boiler Only Model Voltage WARNING Boiler Only The unit must be electrically grounded in accordance... -
Page 44: C Wiring
Page 44 LAARS Heating Systems FLA = Full Load Amperage Water Heater Only MCA = Minimum Circuit Ampacity Water Heater Only Model Voltage MOP = Maximum Over-current Protection Voltage Model On all models, the incoming voltage must be Water Heater Only... -
Page 45: D Control Panel Layout
Page 45 XTR Commercial Boilers and Water Heaters HERM 8.D Control Panel Layout LWCO (Field Installed Option or part of CSD-1 Construction) Transformer with built- in auto- resetting thermal cut-out Boiler Integrated Control Gateway (Field Installed Option) Alarm Bell (Field Installed Option) Figure 35. -
Page 46: E Field Connections
Page 46 LAARS Heating Systems Field Connections as Lag controllers. Prior to wiring units for cascade operations, select one unit as the lead boiler/ water Pump Contacts (Dry) 8.E.1 heater. Other units connected to the lead boiler/ water Boiler Pump - when connecting a boiler pump, use heater will be referred to as lag units. -
Page 47: Safety Interlocks
Page 47 XTR Commercial Boilers and Water Heaters HERM RS485 NOTE: RS485 Grounding & Shielding Low Gas Pressure if a low gas pressure switch is used, remove the jumper Grounding: to ensure that common mode voltage does not compromise the data, or damage the from terminals 19 and 20 on the low voltage board and equipment, an extra wire should always be used wire the switch to these terminals. -
Page 48: Analog Output, Pump
Page 48 LAARS Heating Systems on the settings selected at the DHW or DHW3 parameter 8.E.10 Analog BMS screens. The temperature is displayed ond the home If an analog input (0 – 10VDC or 4-20mA) from a building screen below the faucet icon. The controller initiates a... -
Page 49: F Modbus/Bacnet Memory Map
Page 49 XTR Commercial Boilers and Water Heaters HERM Modbus/BACnet Memory Map ModBus / BACnet Memory Map BACnet BACnet ModBus Description/ Object Name Data Object Units Notes Address Type Read Only Inlet Temperature Outlet Temperature DHW Temperature System Return Temperature System Supply Temperature Outdoor Temperature Flue Temperature... - Page 50 Page 50 LAARS Heating Systems Modbus/BACnet Memory Map (continued) 40 = 24VDC Error 41 = 24VAC Error 55 = 5VDC Error 42 = DHW Probe 51 = Auto Reset High Limit - Onboard 54 = Condensate Level Switch Open Error Code...
- Page 51 Page 51 XTR Commercial Boilers and Water Heaters HERM 0 = Not connected 1 = Not available Lag 7 State 2 = Available 3 = Running 4 = Locked out Lag 7 Firing Rate The current firing rate (0-100%) of Lag 7. 0 = Not connected 1 = Not available Lead State...
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Page 52: G Wiring Diagram
Page 52 LAARS Heating Systems 8.G Wiring Diagram LINE VOLTAGE TERMINAL BOARD LOCATION ON TB2 TB2:1 BK/O BOILER TB2:2 PUMP BR/R TB2:3 TB2:4 SYSTEM TB2:5 BL/R LOW VOLTAGE = PUMP TB2:6 LINE VOLTAGE = TB2:7 HIGH VOLTAGE = PUMP ALARM... -
Page 53: Logic Diagram
Page 53 XTR Commercial Boilers and Water Heaters HERM Logic Diagram 120VAC (1PH/60Hz) CASCADE MAIN POWER BLOWER SWITCH X5-2 RS 485 X5-6 PWM SIGNAL X5-7 X5-1 ALARM ALARM NO BLOWER MOTOR X10:1 X10:3 BOILER/HEATER BOILER/HEATER FIELD CONTROLLER CONTROLLER INTERLOCK X9:11 X9:2 AUTO RESET GAS VALVE... -
Page 54: Section 9 Using The Touch Screen 9.A The Home Screen
Page 54 LAARS Heating Systems SECTION 9 USING THE TOUCH SCREEN 9.A The Home Screen Figure 38. Home Screen Active Icons Description Name Icon Displays the current lock status icon. Touch the lock icon to lock or unlock the Security See Section 9.B on page 56... -
Page 55: Keypad Operations
Page 55 HERM Keypad Operations 9.A.1 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 / Central Heat / Central Heat One Shows the current setting of the parameter. -
Page 56: B Login To Lock / Unlock The Display Screen
Page 56 LAARS Heating Systems 9.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 57: C Quick Start
Q U I C K S T A R T Page 57 HERM 9.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 functions are •... -
Page 58: C.1.A Ch1 (Central Heat, One) 1
Q U I C K S T A R T Page 58 LAARS Heating Systems 9.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 59: Outdoor Reset
Q U I C K S T A R T Page 59 HERM 9.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 60: Anti-Short Cycle
Q U I C K S T A R T Page 60 LAARS Heating Systems 9.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 61: D Configuration
C O N F I G U R A T I O N Page 61 HERM 9.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. -
Page 62: Central Heat)
C O N F I G U R A T I O N Page 62 LAARS Heating Systems 9.D.1 CH (Central Heat) “CH” stands for “Central Heat.” It is used for space heating demands. On the Configure Screen, touch the CH thermometer icon to navigate to... -
Page 63: D.1.A.1 Pid Low
C O N F I G U R A T I O N Page 63 HERM 9.D.1.a.1 PID Low Note that in most cases, PID parameters will not need to be changed. The PID Parameters Screen allows adjustment to the following parameters: •... -
Page 64: Dhw Parameters (Domestic Hot Water)
Page 64 LAARS Heating Systems NOTE: A DHW heat demand 9.D.2 DHW Parameters (Domestic Hot Water) can be initiated by an aquastat or sensor. See Section 8.E.7 and To navigate to the DHW Screen, touch the DHW 8.E.8 on page 47 faucet icon on the Configure Screen. -
Page 65: Outdoor Reset
C O N F I G U R A T I O N Page 65 HERM 9.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. The Outdoor Parameters Screen allows the adjustment of the following parameters: •... -
Page 66: Cascade
C O N F I G U R A T I O N Page 66 LAARS Heating Systems 9.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. - Page 67 Page 67 HERM About Cascading (Lead / Lag) -continued Log In Settings Parameter User Installer Default Unit Base Load Drop Load Min On Time Seconds Min Off Time Seconds Table 24. Parameter Settings 20:1 will be called to run. The 20:1 will fire at the same firing rate as the 5:1, which is limited to 20% minimum (instead of the allowable minimum firing rate of 5%).
- Page 68 Page 68 LAARS Heating Systems 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 the base load value.
- Page 69 Page 69 HERM About Cascading (Lead / Lag) -continued Low demand: The first boiler in sequence ignites and gradually increases firing rate to satify the heat demand. Increased demand: Once Increased demand: Once the first boiler reaches the the first boiler reaches the Base Load Value (65%) Base Load Value (65%) firing rate, the second firing rate, the second boiler ignites. After boiler ignites. After ignition, ignition, both units both units modulate to half modulate to half of the ...
- Page 70 Page 70 LAARS Heating Systems (continued from previous page) Decreasing demand: As the demand decreases, once the requested firing rate reaches the Drop Load Value , the eighth boiler turns off. Continued decreasing demand: As the demand decreases, once the requested firing rate reaches the Drop Load Value , the seventh boiler turns off. This pattern continues as demand continues to decrease until there is a single boiler firing. Demand Satisfied: When the heat demand is satisfied or the temperature reaches the set point + off hysteresis, the final boiler will turn off. Lead/Lag ‐ 4 up to 8 boilers Figure 45. Lead / Lag, Demand Decrease, 4 to 8 Boilers...
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Page 71: D.4.A Cascade Parameters
C O N F I G U R A T I O N Page 71 HERM 9.D.4.a Cascade Parameters To navigate to the Cascade Parameters Screen, touch the Cascade Icon on the Configuration Screen, then touch the Cascade Parameters Icon. The Cascade Parameters Screen allows adjustment of the following parameters: •... -
Page 72: D.4.A.1 Base / Drop Load
Page 72 LAARS Heating Systems Base / Drop Load 9.D.4.a.1 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 73: D.4.B.1 Rotation Setup
Page 73 HERM Rotation Setup 9.D.4.b.1 There are two options for cascade Rotation Setup, Rotation ‘Mode’: Run Time Recurrence For Recurrence Mode, there are two parameters: In the Run Time Mode, you can adjust only the Time of Day. You can adjust the hour and minute Rotation Run Time Hours. -
Page 74: Pumps
Page 74 LAARS Heating Systems 9.D.5 Hybrid 9.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 – the pump will turn on automatically upon a call for heat. -
Page 75: D.6.A Vari-Prime
C O N F I G U R A T I O N Page 75 HERM ® 9.D.6.a VARI-PRIME Vari-Prime is the variable speed pump control and the Vari-Prime Screen allows the adjustment of the following parameters: • On Delay – Upon a call for heat, once the unit ignites, this is the amount of time the unit will wait prior to modulating the pump speed. -
Page 76: Manual Firing Rate
C O N F I G U R A T I O N Page 76 LAARS Heating Systems 9.D.7 Manual Firing Rate To navigate to the Manual Firing Rate Screen, touch the Manual Firing Rate Icon on the Configuration Screen. -
Page 77: D.8.A Delta T Parameters
C O N F I G U R A T I O N Page 77 HERM 9.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 78: External
C O N F I G U R A T I O N Page 78 LAARS Heating Systems 9.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 79: D.9.A External - Remote Set Point
C O N F I G U R A T I O N Page 79 HERM 9.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 80: D.9.B External Firing Rate
Page 80 LAARS Heating Systems 9.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 81: Miscellaneous Features
Page 81 XTR Commercial Boilers and Water Heaters HERM 9.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 to the following items: • Priorities – To set the Demand Priorities for all configured CHW or DHW heating demands. The higher the number, the higher the priority it is assigned. -
Page 82: D.11.A Demands Priorities
Page 82 LAARS Heating Systems 9.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. The higher the number, the higher the priority that demand is assigned. -
Page 83: D.11.C Warm Weather Shutdown
Page 83 XTR Commercial Boilers and Water Heaters HERM 9.D.11.c Warm Weather Shutdown To navigate to the Warm Weather Shutdown 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 84: D.11.D Com Port, Bms
Page 84 LAARS Heating Systems 9.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 85: D.11.E Temperature Conversion
Page 85 XTR Commercial Boilers and Water Heaters HERM 9.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 86: Login
Page 86 LAARS Heating Systems 9.D.12 Login To navigate to the Login Screen, touch the Lock Icon on ANY screen. The Login Screen allows the operator to make parameter adjustments based on the level of the login credentials. See Section 9.B on page 56 9.E Service Screens... -
Page 87: Burner
Page 87 XTR Commercial Boilers and Water Heaters HERM 9.E.1 Burner Navigate to the Burner Screen by touching the Burner Button on the Service Screen. 9.E.1.a Enable / Disable At this menu, you can enable or disable the burner. 9.E.1.b Altitude Adjustment Before starting the unit, verify that the unit’s control is setup for the correct altitude. -
Page 88: Digital I/O ( Input / Output )
Page 88 LAARS Heating Systems 9.E.2 Digital I/O ( Input / Output ) There are two screen 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 89: Analog I/O
Page 89 XTR Commercial Boilers and Water Heaters HERM 9.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 90: Screen Settings Timeout
Page 90 LAARS Heating Systems 9.E.5 History Navigate to the History Screen by touching the History Button on the Service Screen. The History Screen provides information on boiler operations and cycle counts. The control accumulates and displays the number of heat demand cycles, burner cycles, and pump cycles. -
Page 91: About About The Firmware
Page 91 XTR Commercial Boilers and Water Heaters HERM Messages and USB 9.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). 9.F.2 USB Functionality The USB port is on the back of the display. -
Page 92: G Active Demands
Page 92 LAARS Heating Systems 9.G Active Demands The Active Demand Window indicates the status of active heat demands. Sec�on 6.5 Ac�ve Demands Ac�ve Demand Bar A black heat demand icon indicates the heat demand that is currently being satisfied. A “grayed out” heat demand The Ac�ve Demand Bar indicates the status of ac�ve heat demands. -
Page 93: Section 10 Parameter Tables
Page 93 XTR Commercial Boilers and Water Heaters HERM SECTION 10 Parameter Tables 10.A Boilers 399-1500 Hydronic Minimum Maximum Default Time & Date Hour Minute Month Year CH1 Enable/Disable Disable Enable Enable CH1 Setpoint 40 F 190 F 180 F CH1 On Hysteresis 20 F 10 F... - Page 94 Page 94 LAARS Heating Systems 399-1500 Hydronic Minimum Maximum Default Auto/ Always On/ Off During Disable DHW/Auto - Off Auto Boiler Pump Control When Temperature Reached Boiler Pump Post Circulation 0 secs 600 secs 60 secs DHW Pump Control Disable...
- Page 95 Page 95 XTR Commercial Boilers and Water Heaters HERM 399-1500 Hydronic Minimum Maximum Default Summer Kick DHW 0 secs 600 secs 120 secs Summer Kick System 0 secs 600 secs 120 secs Summer Kick Period 10 min 2000 min 1440 min Anti- Short Cycle Time Cycle Time 0 secs...
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Page 96: B Volume Water Heaters
Page 96 LAARS Heating Systems 10.B Volume Water Heaters 399-1500 VW Minimum Maximum Default Time & Date Hour Minute Month Year DHW1 DHW1 Enable/Disable Disable Enable Enable DHW1 Setpoint 190 F 180 F DHW1 On Hysteresis 20 F 10 F... - Page 97 Page 97 XTR Commercial Boilers and Water Heaters HERM 399-1500 VW Minimum Maximum Default Auto/ Always On/ Disable Auto System Pump Control Off During DHW System Pump Post Circulation 0 secs 600 secs 60 secs Firing Rate Enable Burner Disable Enable Disable Firing Rate...
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Page 98: Section 11 First Start Up & Adjustment
Page 98 LAARS Heating Systems Parameters Tables (continued) 399-1500 VW Minimum Maximum Default Hysteresis (0.01" W.C.) Pressure - Transmitter Scaling Slope 2000 1000 Offset -1000 1000 P1 Voltage 0 mV 5000 mV P2 Voltage 0 mV 5000 mV 4500 P1 Pressure (0.01" W.C.) P2 Pressure (0.01"... -
Page 99: A Filling The Boiler System
Page 99 XTR Commercial Boilers and Water Heaters HERM 11.C Initial Operation 11.A Filling the Boiler System The initial setup must be checked before the unit is 1. Ensure the system is fully connected and all air- put into operation. Problems such as failure to start, bleeding devices are closed. -
Page 100: D Combustion Setup
Page 100 LAARS Heating Systems 11.D Combustion Setup WARNING High Fire Low Fire The combustion must be properly adjusted before % CO (ppm) CO % CO (ppm) placing the unit into operation. An improperly <200 <10 adjusted unit could result in serious injury or death. -
Page 101: E Shutting Down The Unit
Page 101 XTR Commercial Boilers and Water Heaters HERM Low Fire Adjustment Gas Supply (under cap) Measurement Port High Fire Adjustment (under cap) High Fire Adjustment Gas Supply Measurement Port Low Fire Adjustment Gas Valve Adjust, 399 - 500 Figure 51. Gas Valve Adjust, 999 - 1500 Figure 53. -
Page 102: A Annually
Page 102 LAARS Heating Systems SECTION 12 MAINTENANCE pool chemicals, refrigerants, paint, spray cans, cleaning, and laundry chemicals. When the air WARNING intake is contaminated with these chemicals, rapid deterioration of the unit will occur. Disconnect all power to the unit before attempting 11. -
Page 103: Condensate Trap
Page 103 XTR Commercial Boilers and Water Heaters HERM – 1500) or 4 M5 socket head screws (for models Unscrew the top and bottom caps from the trap. 399 – 500) connecting the blower to the heat Remove any debris. Rinse the float, level switch, exchanger. -
Page 104: Spark And Flame Sensor Electrodes
Page 104 LAARS Heating Systems 4. Be sure that the filter is dry and that the airflow 12.B.5 Gas Valve direction arrow on the filter is pointing in the correct The gas valve consists of a valve body that direction per the figure. Re-insert the filter into the incorporates the on/off flow control and a negative filter box and replace the access cover. -
Page 105: Blower
Page 105 XTR Commercial Boilers and Water Heaters HERM 12.B.8 Touchscreen Display 12.B.6 Blower The combustion air blower is a high-pressure centrifugal The touchscreen display is used to adjust all operating blower with a variable speed motor. The blower is parameters of the unit. -
Page 106: Gas Pressure Switches (Optional)
Page 106 LAARS Heating Systems 12.B.10 Gas Pressure Switches (optional) 12.B.11 Pressure Transmitters If equipped, the high and low gas pressure switches The pressure transmitters measure the air-side are manual reset switches that act to cut power to the pressure drop across the unit and are used for both air... -
Page 107: Prespark
Page 107 XTR Commercial Boilers and Water Heaters HERM Timer has expired, the unit will transition to Lockout Once reached, the Interpurge Timer will start. Once mode and display a “Lockout: Low Air Proving Press” the Interpurge Timer expires, the unit will transition to error. - Page 108 Page 108 LAARS Heating Systems Troubleshooting (continued) Parameter Value Description 0.25 in. W.C. 0.40 in. W.C. The pressure must be below this value during Prepurge Open 0.20 in. W.C. Air Proving Limit 0.20 in. W.C. mode and above this value during Prepurge Closed mode.
- Page 109 Page 109 XTR Commercial Boilers and Water Heaters HERM Start Lockout Reset & Safety Chain Closed / Error Fixed Standby Lockout Heat Demand Safety Chain Closed / Lockout Error Fixed Condition Start Circulator Safety Chain Open / Error Block Press. > Air Proving Limit or Safety Chain Open or Prepurge No Heat...
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Page 110: B Error Codes
Page 110 LAARS Heating Systems 13.B Error Codes. Condition Information Corrective Action(s) Auto Reset The outlet water temperature has exceeded Verify that the system is full of water and all air the field installed auto reset high limit setting. - Page 111 Page 111 XTR Commercial Boilers and Water Heaters HERM Error Codes (continued) Condition Information Corrective Action(s) Auto Reset table below gives the resistance of the probe at The outlet water temperature has exceeded Verify that the system is full of water and all air various temperatures.
- Page 112 Page 112 LAARS Heating Systems Error Codes (continued) Condition Information Corrective Action(s) Auto Reset The outlet water temperature has exceeded Verify that the system is full of water and all air the field installed auto reset high limit setting.
- Page 113 Page 113 XTR Commercial Boilers and Water Heaters HERM Condition Information Corrective Action(s) Auto Reset the resistance of the probe at various The outlet water temperature has exceeded Verify that the system is full of water and all air the field installed auto reset high limit setting.
- Page 114 Verify that the gas supply pressure Trials meets the requirements specified. Manual-reset condition Page 114 LAARS Heating Systems Verify proper operation of the gas valve. Annunciation – on Navigation Bar Remove and inspect the ignitor and flame sense Lockout: Max Ignition Trials ...
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Page 115: C Index
Page 115 XTR Commercial Boilers and Water Heaters HERM 13.C Index Parameter Tables 93 Factory Reset 90 Active Demands 92 PID High / PID Low 63 Firmware 90 Air Pressure Transmitters 8 Polypropylene 17 First Start Up Alarm 47 Pressure Relief Valve 31 Commission 98 Alarm Bell 46 Priorities Demand 82... - Page 116 PMS® 300 mark, or white outline. Headquarters: Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355 9 Brigden Gate, Halton Hills, Ontario, Canada L7G 0A3 (905) 203-0600 Fax: (905) 636-0666 www.Laars.com Printed in U.S.A. © Laars Heating Systems 23-10 Document 1475A...
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