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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 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.
WARNING
Installation and Operation Instructions for
O
MNI
with Laars Linc
Boiler
Model ONH1250
1,250 MBTU/h
Model ONH1500
1,500 MBTU/h
Model ONH1750
1,750 MBTU/h
Model ONH2000
2,000 MBTU/h
Model ONH2500
2,500 MBTU/h
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 1353B
T
HERM
®
Water Heater
Model ONV1250
1,250 MBTU/h
Model ONV1500
1,500 MBTU/h
Model ONV1750
1,750 MBTU/h
Model ONV2000
2,000 MBTU/h
Model ONV2500
2,500 MBTU/h
AVERTISSEMENT
®
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Table of Contents
Related Manuals for Laars OMNITHERM ONH1250
Summary of Contents for Laars OMNITHERM ONH1250
- Page 1 Installation and Operation Instructions Document 1353B Installation and Operation Instructions for HERM ® ® with Laars Linc Boiler Water Heater Model ONH1250 Model ONV1250 1,250 MBTU/h 1,250 MBTU/h Model ONH1500 Model ONV1500 1,500 MBTU/h 1,500 MBTU/h Model ONH1750 Model ONV1750...
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Page 2: Table Of Contents
LAARS Heating Systems Table of Contents SECTION 5 Piping SECTION 1 General Information Introduction ..........5 Boiler Water Piping ........26 Warranty .............5 5.A.1 Boiler Water Connections ......26 Model Identification ........5 5.A.2 Cold Water Make-Up ........26 Safety Notes ..........6 5.A.3 Freeze Protection ........27... - Page 3 HERM SECTION 9 Gas Valve Touchscreen, SECTION 8 (continued) Menus and Descriptions 8.C.6 Time & Date ..........60 About the Gas Valve .........89 Configuration ..........61 Menu Structure (Example) ....... 90 8.D.1 CH (Central Heat) ........62 Gas Valve Display Navigation and Menus 90 8.D.1.a CH1 (Central Heat, One) ......
- Page 4 LAARS Heating Systems...
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Page 5: Section 1 General Information 1.A Introduction
HERM ® OmniTherm - Category I / III Vent HERM Commercial Boiler / Water Heater ONH & ONV with Laars Linc Control Page 5 Standard Features SECTION 1 General Information • ASME "H" stamp (ONH) • Sealed combustion chamber • High & low gas pressure switches 1.A Introduction... -
Page 6: D Safety Notes
LAARS Heating Systems Page 6 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 HERM Page 7 NOTE: All installations must be made in accordance with WARNING 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 Dimensions And Components
LAARS Heating Systems Page 8 Unit Dimensions and Components 1.E.1 Model 1250 / 1500 24.5 Electrical 6” 26.7 10.3 Connections Air Inlet 2” NPT Gas 12” 48.4 Vent 20.5 Cond Trap 11.5 ” Outlet ” Inlet Dims are in Inches 17.7... - Page 9 HERM Page 9 Blower Gas Valve System Controls Touchscreen Gas Valve Touchscreen Control Panel Heat Exchanger Power Pack Power Connections Conduit Manual Gas Valve Air Filter Box Power Connections Vent Condensate Trap Water Inlet Water Outlet...
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Page 10: Model 1750
LAARS Heating Systems Page 10 1.E.2 Model 1750 32.0 31.6 20.2 Electrical Connections Air Inlet 55.6 2” NPT Gas Vent 25.8 Cond Trap 20.1 Dims are in Inches 3” 3” Outlet Inlet 25.8 OMT 1.75 Gas Valve Reset Sight Glass... - Page 11 HERM Page 11 Blower Gas Valve System Controls Touchscreen Gas Valve Touchscreen (Behind Top Panel) Control Panel Manual Gas Valve Power Pack Power Connections Manual Conduit Gas Valve Power Connections Air Filter Box Gas Inlet Vent Heat Exchanger Condensate Trap Water Inlet Water Outlet...
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Page 12: Models 2000 / 2500
LAARS Heating Systems Page 12 1.E.3 Models 2000 / 2500 42.8 32.0 78.0 INLET Model 1250/1500 Model 1750 Model 2000/2500 (shown here for size reference only) DIMS ARE IN INCHES 42.8 20.2 Electrical Connections OMT 1.5/1.25 OMT 2.0/2.5 INLET 2" NPT 15.9... - Page 13 HERM Page 13 Blower Gas Valve Gas Valve Touchscreen System Controls Touchscreen Power Pack Heat Exchanger Power Manual Gas Valve Connections Conduit Power Connections Air Filter Box Vent Condensate Trap Water Inlet Water Outlet...
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Page 14: F Unpacking
LAARS Heating Systems Page 14 Unpacking The unit should not be located in an area where leakage This unit is shipped in a single crate. Carefully of any connections will result in damage to the area disassemble the crate and inspect the unit for any adjacent to the unit, or to lower floors of the structure. -
Page 15: Section 2 Venting And Combustion Air
HERM Page 15 SECTION 2 Venting and Combustion Air 2.A.2 Combustion Air Boilers and water heaters must have provisions for 2.A General Venting Info, Cat I and Cat III combustion and ventilation air in accordance with Section 5.3, Air for Combustion and Ventilation, of the National Fuel Gas Code, ANSI Z223.1, or Sections WARNING 7.2, 7.3 or 7.4 of CSA B149.1, Installation Codes, or... -
Page 16: A.2.B Ducted Combustion Air
LAARS Heating Systems Page 16 Typical** Minimum Maximum Minimum Maximum Category III Air Collar Ducted Air Vent Collar Category I Category III Category III Ducted Air Ducted Air Vent Pipe Size Pipe Size Size Vent Pipe Vent Pipe Vent Pipe... -
Page 17: B Category I Venting
HERM Page 17 2.B Category I Venting WARNING 2.B.1 Category I Vent Operation of appliances with a blocked common vent may lead to serious injury or death. Safety devices must be implemented to prevent blocked common vent operation. If safe operation of all appliances connected to a common vent cannot be assured, including prevention of spillage of flue WARNING gasses into living spaces, common venting should not be... -
Page 18: Common Vent Test - Boilers
LAARS Heating Systems Page 18 2.B.3 Common Vent Test — Boilers 2.B.3 Test d’évent Commun — Chaudières When an existing boiler is removed from a common Lorsqu’une chaudière existante est déconnectée du réseau venting system, the common venting system is likely d’évents commun, ce réseau d’évents commun devient... -
Page 19: C Category Iii Venting
HERM Page 19 Change: Diam and Length Notes added to bottom of table in a new "NOTES:" section; asterisks were changed to numerical superscripts for in‐table notes Manufacturer Model Numbers (abbreviated) Heatfab® Duravent® Z‐Flex® Example Components Trade Name/Model Saf‐T Vent® FasNSeal® Z‐Vent® 90° Elbow FSELB90 2SVEE DLL* DDLL Pipe FSVL 2SVEP Boiler Adapter 01MAD 2SVAFN Horizontal Termination (Bird Screen) FSBS 2SVSTPX Vertical Termination (Rain Cap) 00CI FSRC 2SVSRC Inlet Air Termination 14TERM FSAIH06** 2SVEE 90 with 2SVSTPX Adapter, SS to CPVC FSA‐ FNSM‐ PVCF Distance between Hanger Straps ... -
Page 20: Locating Vent & Comb Air Terminals
LAARS Heating Systems Page 20 2.D Locating Vent & Combustion Air Locate the combustion air terminal so that it cannot be blocked by snow. The National Fuel Terminals Gas Code requires that it be at least 12 inches (30 cm) above grade, but the installer may determine it 2.D.1... - Page 21 HERM Page 21 Canadian Installations 1 U.S. Installations 2 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 22: E Outdoor Installation
LAARS Heating Systems Page 22 Outdoor Installation WARNING NOTE: Outdoor Installation of OMV's (volume water heaters) is not permitted in Canada. If installing outdoors in a location that may experience freezing temperatures, provisions must Precautions must be taken to prevent water in the heat be made to protect the unit from freeze damage. -
Page 23: F Installations In The Commonwealth Of Massachusetts
HERM Page 23 SECTION 3 Gas Supply and Piping Installations in the Commonwealth of 3.A Gas Supply and Piping Massachusetts All Installations must conform to the National Fuel Gas In Massachusetts the following items are required if the Code ANSI Z223.1/NFPA54, and/or local codes. In side-wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, Canada, the installation must conform to the latest edition... -
Page 24: B Gas Pipe Sizing
LAARS Heating Systems Page 24 2. The gas pressure must be 4.0-10.5 inches w.c. SECTION 4 Water Flow and 3. Table 10 offers some gas pipe sizing information. Refer Headloss Data to the applicable gas code for more detailed sizing 4.A General Water Flow Information... -
Page 25: B Boiler Water Flow & Headloss Data
HERM Page 25 4.B Boiler Water Flow & Headloss Data ater Flow See Table 11 for water flow and boiler headloss, based equirements on heat exchanger temperature rise. Temperature Rise Model 20°F 25°F 30°F 35°F 40°F Flow Headloss* Flow Headloss* Flow Headloss* Flow... -
Page 26: Recovery Data
LAARS Heating Systems Page 26 4.D Water Flow Recovery Data ecovery Temperature Rise 40°F 50°F 60°F 70°F 80°F 90°F 100°F Model 1250 3188 2550 2125 1821 1594 1417 1275 1500 3780 3024 2520 2160 1890 1680 1512 1750 4463 3570... -
Page 27: Freeze Protection
HERM Page 27 5.A.3 Freeze Protection Please refer to the manufacturers instructions for proper This unit may be installed indoors or outdoors. If installing selection and application. outdoors in a location that may experience freezing temperatures, precautions must be taken to prevent water •... -
Page 28: Suggested Boiler Piping Schematics
LAARS Heating Systems Page 28 5.A.4 Suggested Boiler Piping Schematics Figure 4 on page 28 through Figure 7 on page 31 show suggested piping configurations for boilers. These diagrams are only meant as guides. All components or piping required by local code must be installed. - Page 29 HERM Page 29 Low temp. radiant zone Low temp. radiant zone Air vent Water feed controls Expansion tank 4 pipe dia. max. 4 pipe Dia. Max Anti-scald NOTE: This drawing is a schematic NOTE: This drawing is a schematic mixing representation of a piping style, representation of a piping style and is not valve...
- Page 30 LAARS Heating Systems Page 30 Space heating Suggested Boiler Piping Schematics (continued) zone circuits 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.
- Page 31 HERM Page 31 High temp. NOTE: This drawing is a schematic Space heating space heating zone circuit representation of a piping style and is not zone circuits intended to be used as a working installation drawing. Local code requirements must be met. Space heating zone circuit Air vent 4 pipe dia.
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Page 32: Water Heaters
LAARS Heating Systems Page 32 5.B Water Heaters 5.B.3 Cold Water Make-Up 5.B.1 Water Quality The cold water make-up may be connected to the tank Water heaters must be installed in water conditions of as shown in Figure 8 through Figure 10. If the tank does 15 gpg hardness or less, with a pH range of 6.5 to 9.5... - Page 33 HERM Page 33 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. NOTES: 1. Locate the DHW sensor or remote aquastat well in lower 1/3 of tank.
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Page 34: Section 6 Condensate Drain Trap
LAARS Heating Systems Page 34 SECTION 6 Condensate Drain Trap SECTION 7 Electrical Connections 7.A Installation Warnings This appliance creates condensation at some operating conditions as a by-product of cold water supply conditions. A condensate drain trap is pre-installed at the... -
Page 35: Main Power Connections
HERM Page 35 7.B Main Power Connections This unit is provided with an electrical junction box on the rear panel for main power connections. See Figure 12. All power wires are factory installed between this junction box and the main high voltage box at the front of the unit. -
Page 36: Control Panel Layout
120N 120N LAARS Heating Systems Page 36 120N 120L 7.D Control Panel Layout 120L 120L BOILER PUMP (N) 17 BOILER PUMP (L) 18 DHW PUMP DHW PUMP SYSTEM PUMP SYSTEM PUMP SPARE 1 SPARE 1 SPARE 2 SPARE 2 ALARM BELL... -
Page 37: Power
HERM Page 37 Figure 15. Jumper locations at the Inputs and Outputs 7.E.1 Power 7.E.2 Boiler Pump If connecting a boiler contactor or pump, use terminals relay coil voltage would be applied at terminal 19, and 17 (neutral) and 18 (line voltage). The output of these when the DHW pump is activated, would be available terminals is 120VAC with a maximum output current of at terminal 20. -
Page 38: Sensors
LAARS Heating Systems Page 38 7.E.5 Sensors WARNING System Supply - if used, is connected to terminals 29 When servicing the controls, label all wires prior to and 30. When connected, the controller automatically disconnection. Wiring errors can cause improper detects the presence of this sensor and the temperature and dangerous operation. -
Page 39: Rs 485 For Cascade (Lead Lag)
OUTDOOR OUTDOOR OUTDOOR CH1/DHW1 CH1/DHW1 CH1/DHW1 HERM CH1/DHW1 CH1/DHW1 CH1/DHW1 Page 39 CH2/DHW2 CH2/DHW2 CH2/DHW2 CH2/DHW2 CH2/DHW2 CH2/DHW2 DHW/DHW3 DHW/DHW3 DHW/DHW3 RS485 NOTE: RS485 Grounding & Shielding DHW/DHW3 DHW/DHW3 DHW/DHW3 Grounding: To ensure that common mode voltage does not compromise the date, or damage the equipment, an extra SPARE 1 SPARE 1 SPARE 1... -
Page 40: Modbus/Bacnet Memory Map
BAS 0-10VDC BAS 0-10VDC BAS 0-10VDC BAS 0-10VDC BAS 0-10VDC PUMP 0-10VDC PUMP 0-10VDC PUMP 0-10VDC LAARS Heating Systems Page 40 PUMP 0-10VDC PUMP 0-10VDC PUMP 0-10VDC RUN - C RUN - C RUN - C RS 485 BMS (continued) RUN - N.C. - Page 41 0=None 1=Anti-Short Cycle 2=Service HERM 3=DHW Page 41 4=Cascade Read Demand source Read 5=External Modbus BACnet BACnet 6=CH1 Address Map Descriptor Name Data Object Read/Write Notes 7=CH2 Read Inlet sensor Read 10=Anti-Frost Read Outlet sensor Read 11=Warm Weather Shutdown bit0 = Run Contact Read Flue Sensor Read...
- Page 42 Read History - Boiler Average Firing Temperatur Read ° Read History - Boiler Maximum Firing Time Read Hours LAARS Heating Systems Read History - Boiler Minimum Firing Time Read Hours Page 42 0 = None 1 = Outlet 2 = DHW...
- Page 43 183 = Lockout Read Burner Status 1 Read 188 = Testmode 194 = Prepurge Closed 195 = Wait for HIS Free HERM Page 43 196 = HIS Preheat/Prespark 200 = Verify Primary SF 217 = interpurge 241 = Postpurge 245 = Trial for Ignition Modbus BACnet BACnet...
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Page 44: Wiring Diagrams - High Voltage
HIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE LAARS Heating Systems PROPRIETARY TO LAARS HEATING SYSTEMS CO.AND SHALL NOT BE Page 44 REPRODUCED, TRANSFERRED TO OTHER DOCUMENTS, USED OR DISCLOSED TO OTHERS FOR MANUFACTURING OR ANY OTHER PURPOSE EXCEPT AS SPECIFICALLY AUTHORIZED IN WRITING 7.G Wiring Diagrams - High Voltage... - Page 45 REVISIONS HERM Page 45 REV. DRAFT CHECK DG 3/7/19 RR 3/7/19 17-152N-03 UPDATED TO ADD FAN TO CONTROL PA CHANGE: TB1-16:3 24L 24VAC 24VAC TB1-12:3 24N (COM) UNLESS OTHERWISE SPECIFIED: DO NOT SCALE DRAWING. TOLERANCES ARE: THIRD ANGLE PROJECTION. DECIMALS .X FRACTIONS 1/8"...
- Page 46 LAARS Heating Systems Page 46 Wiring Diagrams (continued) Figure 19. Wiring Diagram, 208, 240V 1 Phase 1250 to 2500...
- Page 47 HERM Page 47 Figure 20. Wiring Diagram, 208V 3 Phase 2500...
- Page 48 LAARS Heating Systems Page 48 Wiring Diagrams (continued) Figure 21. Wiring Diagram, 480 - 600V, 3 Phase 2500...
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Page 49: Logic Diagrams
HERM Page 49 7.H Logic Diagrams ONTAINED HEREIN ARE 120VAC (1PH/60Hz) CO.AND SHALL NOT BE CUMENTS, USED OR NG OR ANY OTHER IZED IN WRITING BLOWER MOTOR POWER SWITCH POWER INDICATOR LOW VOLTAGE PANEL ENCLOSURE FAN BLOWER CONTACTOR BOILER/HEATER 120L 120L CONTROLLER 120N... - Page 50 LAARS Heating Systems Page 50 N ARE 208VAC (3PH/60Hz) OT BE REV. TB1-17 POWER Boiler (N) OUTPUTS Pump (L) TB1-18 CHANG BLOWER MOTOR TB1-19 TB1-20 Pump TB1-21 System TB1-22 Pump TB1-23 Spare 1 TB1-24 Spare 1 CONTACTS 120VAC TRANSFORMER (OUTPUTS)
- Page 51 HERM Page 51 N ARE 208/220/240VAC (1PH/60Hz) OT BE REV. L1 L2 TB1-17 POWER Boiler (N) OUTPUTS CHANG TB1-18 Pump (L) BLOWER MOTOR TB1-19 TB1-20 Pump TB1-21 System TB1-22 Pump TB1-23 Spare 1 TB1-24 Spare 1 CONTACTS 120VAC TRANSFORMER (OUTPUTS) TB1-25 Spare 2 Spare 2...
- Page 52 Manual LAARS Heating Systems Page 52 480/575/600VAC (3PH/60Hz) REV. BLOWER MOTOR TB1-17 Boiler (N) POWER CHAN OUTPUTS 220VAC (1PH/60Hz) Pump (L) TB1-18 TB1-19 TB1-20 Pump TB1-21 System TB1-22 Pump TB1-23 Spare 1 120VAC TRANSFORMER TB1-24 CONTACTS Spare 1 (OUTPUTS) TB1-25...
- Page 53 HERM Page 53 This page intentionally left blank.
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Page 54: Section 8 Control Operation
LAARS Heating Systems Page 54 SECTION 8 Control Operation 8.A The Home Screen 8.A.1 Home Screen Active Icons Description Name Icon Security Displays the current lock status icon. Touch the lock icon to lock or unlock the See Section 8.B on page 56 Touchscreen Display. -
Page 55: Keypad Operations
HERM Page 55 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 / Central Heat / Central Heat One Shows the current setting of the parameter. -
Page 56: Login To Lock / Unlock The Disp Screen
LAARS Heating Systems Page 56 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 57: Quick Start
Q U I C K S T A R T HERM Page 57 8.C Quick Start Quick Start will allow a user to configure the basic functionality of the control, without going through all of the parameters that are available. The 6 basic functionalites are •... -
Page 58: Ch1 (Central Heat, One) 1
Q U I C K S T A R T LAARS Heating Systems Page 58 8.C.1.a CH1 (Central Heat, One) • Enable/Disable – This allows CH1 to be enabled/disabled. The default setting is Enabled. • Set Point – This is the set point temperature. -
Page 59: Outdoor Reset
Q U I C K S T A R T HERM Page 59 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 60: Anti-Short Cycle
Q U I C K S T A R T LAARS Heating Systems Page 60 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 61: Configuration
C O N F I G U R A T I O N HERM Page 61 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 62: D.1.A Ch1 (Central Heat, One)
C O N F I G U R A T I O N LAARS Heating Systems Page 62 8.D.1 CH (Central Heat) “CH” stands for “central heat.” It is used for space heating demands. On the Configure Screen, touch the CH thermometer icon to navigate to the CH Selection Screen. -
Page 63: D.1.A.1 Pid Low
C O N F I G U R A T I O N HERM Page 63 8.D.1.a.1 PID Low Active below Setpoint. 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 (Domestic Hot Water)
LAARS Heating Systems Page 64 8.D.2 NOTE: Only a DHW/DHW3 DHW (Domestic Hot Water) heat demand can be initiated by an aquastat or sensor, see To navigate to the DHW/DHW3 Screen, touch the DHW faucet icon on the 7.E on page 36. -
Page 65: Outdoor Reset
C O N F I G U R A T I O N HERM Page 65 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. 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 LAARS Heating Systems Page 66 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. -
Page 67: D.4.A Cascade Parameters
C O N F I G U R A T I O N HERM Page 67 8.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 68: D.4.A.1 Base / Drop Load
LAARS Heating Systems Page 68 8.D.4.a.1 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 69: D.4.B.1 Rotation Setup
C O N F I G U R A T I O N HERM Page 69 8.D.4.b.1 Rotation Setup There are two options for cascade Rotation Setup, Rotation ‘Mode’: Run Time Recurrence In the Run Time Mode, you can adjust only the For Recurrence Mode, there are two parameters: Time of Day. -
Page 70: Pumps
C O N F I G U R A T I O N LAARS Heating Systems Page 70 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 71: D.6.A Vari-Prime
C O N F I G U R A T I O N HERM Page 71 8.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: The Vari-Prime Parameters Screen allows the adjustment of the following parameters: •... -
Page 72: Manual Firing Rate
C O N F I G U R A T I O N LAARS Heating Systems Page 72 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 73: D.8.A Delta T Parameters
C O N F I G U R A T I O N HERM Page 73 8.D.8.a Delta T Parameters To navigate to the Delta T Parameters Screen, touch the Temp Limits Icon on the Configuration Screen, then touch the Delta T Parameters button on the Temperature Limits Parameters Screen. -
Page 74: External
C O N F I G U R A T I O N Page 74 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 75: D.9.A External - Remote Set Point
C O N F I G U R A T I O N HERM Page 75 8.D.9.a External – Remote Set Point. External (0 – 10VDC or 4 – 20mA) • An External heat demand can be initiated by a Building Management System (BMS) using a 0-10VDC or 4-20mA signal. -
Page 76: Miscellaneous Features
C O N F I G U R A T I O N LAARS Heating Systems Page 76 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 77: D.11.A Demands Priorities
C O N F I G U R A T I O N HERM Page 77 8.D.11.a Demands Priorities To navigate to the Demands Priorities Screen, first go to the Miscellaneous folder. At the Demands Priorities screen select each configured demand and assign a priority number. NOTE: Demands Priorities is only active on the lag or stand alone boilers. -
Page 78: D.11.C Warm Weather
C O N F I G U R A T I O N LAARS Heating Systems Page 78 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 79: D.11.D Com Port, Bms
C O N F I G U R A T I O N HERM Page 79 8.D.11.d COM Port, BMS The control has Modbus and BACnet MSTP (RS485) protocols on board, for use with Building Management Systems. Gateways can be used for other communication protocols. To navigate to the COM Port Configuration Screen, touch the Misc Icon on the Configuration Screen, then touch the COM Port Icon on the Misc Configuration Screen. -
Page 80: D.11.E Temperature Conversion
C O N F I G U R A T I O N LAARS Heating Systems Page 80 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 81: Login
C O N F I G U R A T I O N HERM Page 81 8.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 8.B on page 56. -
Page 82: Service Screens
S E R V I C E LAARS Heating Systems Page 82 8.E Service Screens To navigate to the Service Screen, touch the Service Icon in the lower left portion of the Home Screen. Available only to the factory or technician qualified at the OEM level. -
Page 83: Digital I/O Inputs
S E R V I C E HERM Page 83 8.E.2 Digital I/O Inputs 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. Digital I/O Inputs: The indicator light associated with the input is green when the input is satisfied. -
Page 84: Analog I/O
S E R V I C E LAARS Heating Systems Page 84 8.E.3 Analog I/O Navigate to the Analog I/O Screen by touching the Analog I/O Button on the Service Screen. There are two screens associated with the Analog I/O: Analog I/O Inputs; Analog I/O Outputs. -
Page 85: Screen Settings Timeout
S E R V I C E HERM Page 85 8.E.4 Screen (Settings Timeout) Navigate to Screen Settings by touching the Screen Button on the Service Screen. There are two adjustable screen settings: Light Timeout and AutoLock Timeout. • Light Timeout allows the user to adjust the amount of time the touch screen backlight will remain lit after user interaction has ceased. -
Page 86: Restart Touchscreen & Recalibrate
S E R V I C E LAARS Heating Systems Page 86 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. -
Page 87: F Messages And Usb
HERM Page 87 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, the control display can be lifted off of the front of the unit and the USB port is found behind the touchscreen. -
Page 88: G Active Demands
LAARS Heating Systems Page 88 8.G Active Demands The Active Demand Window indicates the status of active heat demands. A black heat demand icon indicates the heat demand that is currently being satisfied. A “grayed out” heat demand icon is either lower in priority than the heat demand that is currently being satisfied, or the heat demand has reached set point, but remains active. -
Page 89: Section 9 Gas Valve Touchscreen, Menus And Descriptions
HERM Page 89 SECTION 9 Gas Valve Touchscreen, Menus and Descriptions 9.A About the Gas Valve This unit utilizes a Honeywell Gas Valve with a touchscreen display. Models 1250 and 1500 Gas Valve Reset Sight Glass Models 1750, 2000 and 2500 Gas Valve Reset Sight Glass... -
Page 90: Menu Structure (Example)
LAARS Heating Systems Page 90 9.B Menu Structure (Example) Your current menu location is always shown in the NAV LOCATION. Keep an eye on this area as it will always tell you where you have navigated to. NAV LOCATION: MENU TABS:... - Page 91 HERM Page 91 From Valve 1, select Setup & Tests. Note your location. Selections • Valve Status - This section gives general information about valve operation and hours and cycles. • Setup & Tests – Allows for valve settings adjustment, configuration of optional components on the boiler and combustion setup of the boiler.
- Page 92 LAARS Heating Systems Page 92 You are now in the Settings menu. MENU TABS: Menu Tabs. General: This menu displays these current settings (as shown). Valve body: Allows the selection of the proper valve body size. This should be done at the factory. No adjustments necessary.
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Page 93: Fuel Air Ratio & Ignition, Menus
HERM Page 93 9.D Fuel Air Ratio & Ignition, Menus Click back to Setup & Tests From Setup & Tests, select Fuel-Air Ratio & Ignition. Fuel Air Ratio & Ignition has several menus that allow for combustion setup, Ignition characteristics modification, Loading and saving A/F curves and valve configurations. -
Page 94: Ignition Menu
LAARS Heating Systems Page 94 9.D.2 Ignition Menu The settings in the ignition tab allow the ignition characteristics of the boiler to be customized to fit the boiler application if needed. In most cases customization will not be necessary. The ignition graph shown is a representation of how the gas valve will react during the trial for ignition process. -
Page 95: Base Curve Menu
HERM Page 95 9.D.3 Base Curve Menu Controls the base A/F ratio curves. These values are set at the factory and can not be adjusted in the field. 9.D.4 Correction Curve Menu Allows for adjustment of the A/F ratio by the installer. To adjust the A/F curves follow the steps provided. Set the desired fan speed. -
Page 96: Summary Menu
LAARS Heating Systems Page 96 9.D.5 Summary Menu The Summary tab shows the A/F curves for the base curve and correction curve, so each curve can be reviewed. The summary tab doesn’t allow the A/F curves to be adjusted, so there is not a risk of making unintended changes. -
Page 97: Diagnostics
HERM Page 97 Diagnostics Home > Valve 1 > Diagnostics – The diagnostics section is broken up into several menus and will help to diagnose issues if they occur. Active faults - lists the faults that are currently active preventing or limiting boiler function. Fault History –... -
Page 98: Verification Menu
LAARS Heating Systems Page 98 Verification Menu Verification is a required process when changes to safety parameters are made. Verification forces a review of the changes made and allows those changes to be accepted. When a setting is changed that requires verification a notification will appear at the bottom of the screen. - Page 99 HERM Page 99...
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Page 100: Gas Valve Password & Login Menu
LAARS Heating Systems Page 100 9.G Gas Valve Password & Login Menu The login screen will appear with an attempt to make changes to a password protected parameter. The login screen can also be accessed by pressing the login icon at the top of the gas valve display. When entering a password select the installer tab and then enter the password LaarsOmt2018. -
Page 101: Section 10 Parameter Tables
HERM Page 101 SECTION 10 Parameter Tables Minimum Maximum Default Time & Date Hour Table 17. ONH Minute (BOILER) Month Parameter and Year Range Table (2 pages) CH1 Enable/Disable Disable Enable Enable CH1 Setpoint 50 F 210 F 180 F CH1 On Hysteresis 60 F 10 F... - Page 102 LAARS Heating Systems Page 102 Minimum Maximum Default Auto/ Always On/ Off System Pump Control Disable Auto During DHW System Pump Post Circulation 0 secs 600 secs 60 secs ONH (BOILER) Vari-Prime Parameter and Range Pump On Delay Timer 1 secs...
- Page 103 HERM Page 103 Table 18. ONV Minimum Maximum Default (WATER Time & Date HEATER) Hour Parameter and Minute Range Table (2 Month pages) Year DHW1 DHW1 Enable/Disable Disable Enable Enable DHW1 Setpoint 50 F 210 F 180 F DHW1 On Hysteresis 60 F 10 F DHW1 Off Hysteresis...
- Page 104 LAARS Heating Systems Page 104 Minimum Maximum Default Time & Date Auto/ Always On/ Off Disable Auto System Pump Control Hour During DHW Minute System Pump Post Circulation 0 secs 600 secs 60 secs ONV (HEATER) Month Variprime (NOT Available on Volume Water Units)
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Page 105: Section 11 Initial Startup Instructions
HERM Page 105 SECTION 11 Initial startup Instructions 11.A Filling the Boiler System water level exceeds ¼ of the volume of the expansion tank, open the tank drain, and drain to that level. 1. Ensure the system is fully connected. Close all bleeding devices and open the make-up water valve. -
Page 106: Initial Operation
LAARS Heating Systems Page 106 11.B Initial Operation WARNING The initial setup must be checked before the unit is put If any odor of gas is detected, or if the gas burner into operation. Problems such as failure to start, rough does not appear to be functioning in a normal ignition, strong exhaust odors, etc. -
Page 107: Combustion Setup
HERM Page 107 11.E Combustion setup The OmniTherm uses a sophisticated gas control system that monitors the gas air ratio and automatically adjusts to maintain proper operating conditions. On initial installation and subsequent inspections, the CO 2 levels should be checked and if outside the allowable range, adjustments made. To make adjustments to the gas air ratio use the gas valve display inside the boiler jacket and follow the process below. -
Page 108: Combustion At The Gas Valve Display
LAARS Heating Systems Page 108 11.E.2 Combustion at the Gas Valve Display 2. Measure the combustion product to determine if the CO 2 levels fall in the ranges listed in the table. If the CO 2 level is out of range adjust the CO 2 by using the gas valve display and the process below. -
Page 109: Section 12 Maintenance
HERM Page 109 SECTION 12 Maintenance 12.A System Maintenance 12.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 110: Main Controller
LAARS Heating Systems Page 110 pass through ceramic insulators and then align with allows the entire gas valve and fuel/air mixer assembly to the ground rod. In order for a proper spark to form, be removed as an assembly to facilitate inspection and the mounting bracket must be grounded to the boiler cleaning. -
Page 111: Gas Pressure Switches
HERM Page 111 12.B.8 Gas Pressure Switches If black carbon soot buildup on the heat exchanger is suspected, disconnect the electrical supply to the unit The high and low pressure gas switches are manual and turn off the gas supply by closing the manual gas reset switches that act to cut power to the interlock valve on the unit. -
Page 112: Section 13 Troubleshooting
LAARS Heating Systems Page 112 SECTION 13 Troubleshooting 13.A Error Codes Condition Information Corrective Action Flow Switch • Insufficient flow at the outlet of the • Faulty boiler/heater pump – boiler/heater replace pump. Auto-reset Condition Faulty pump contactor – replace •... - Page 113 HERM Page 113 Condition Information Corrective Action • Verify supply and manifold gas Lockout: Low Gas Pressure pressures satisfy installation requirements. Condensate • Condensate trap water level is high • Check condensate trap for Level proper drainage Auto-reset Condition • Check condensate trap for stuck Annunciation –...
- Page 114 LAARS Heating Systems Page 114 Error Codes (continued) Condition Information Corrective Action 3563 7139 2463 4937 1739 3489 1253 2514 1845 1376 Inlet Sensor Inlet sensor is damaged or not Check the sensor and wiring. • • connected. Repair or replace as needed.
- Page 115 HERM Page 115 Condition Information Corrective Action Stack Stack sensor disconnected Check the sensor and wiring. • • Sensor Repair or replace as needed. • Stack sensor wiring bad The stack probe is a dual Thermistor elements bad • • element probe with 100K thermistors.
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Page 116: Sv2 Fault Codes
LAARS Heating Systems Page 116 Fault Fault Fault Description Detailed Description Remediation Steps Comments 13.B SV2 Fault Codes Category Number Data Error EEPROM corrupt Main electronics EEPROM is corrupted. 1.) Reset valve and burner management system then cycle power. 2.) If fault persists replace main electronics. - Page 117 HERM Page 117 Fault Fault Fault Description Detailed Description Remediation Steps Comments Category Number If this fault occurs directly after commissioning: Fuel/Air FARMOD target (S2a) The Fuel/Air Ratio redundant gas pressure signal was not not reached within the control setpoint window within the specified time of 1.) Recommission the 4 points of the correction curve and/or add additional points to the correction curve.
- Page 118 LAARS Heating Systems Page 118 Fault Fault Fault Description Detailed Description Remediation Steps Comments Category SV2 Fault Codes (continued) Number Fuel/Air Fuel/Air Correction Curve This fault is ignored when the Installer or OEM are logged Commission the Fuel/Air curve, ensuring the minimum firing rate is entered.
- Page 119 HERM Page 119 Fault Fault Fault Description Detailed Description Remediation Steps Comments Category Number Fuel/Air Control Valve Full Stroke The recorded full stroke of the control valve does not match Replace the valve and re-commission. Mismatch valve size. Fuel/Air Fuel/Air Base Curve Min Fuel/Air Ratio base curve minimum value has not been Commission or load the base fuel/air curve, ensuring the minimum firing rate is entered.
- Page 120 LAARS Heating Systems Page 120 Fault Fault Fault Description Detailed Description Remediation Steps Comments SV2 Fault Codes (continued) Category Number Main K1 internal relay is stuck MV1 internal K1 relay is stuck closed unexpectedly 1.) Reset valve and attempt system restart.
- Page 121 HERM Page 121 Fault Fault Fault Description Detailed Description Remediation Steps Comments Category Number POC 2 (proof of closure) POC 2 switch output does not match valve seat 2 Remove power and shut-off gas supply as necessary. incorrect position powered/not powered status. 1.) Remove valve front electrical and rear solenoid enclosures.
- Page 122 LAARS Heating Systems Page 122 Fault Fault Fault Description Detailed Description Remediation Steps Comments SV2 Fault Codes (continued) Category Number Solenoid 2 Solenoid 2 signal fault Solenoid 2 terminal signal is not valid. Frequency or duty is Remove power and shut-off gas supply as necessary.
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Page 123: Section 14 Replacement Parts
HERM Page 123 SECTION 14 Replacement Parts Use only genuine Manufacturer replacement parts. 14.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). 14.B Component Illustrations, Parts Lists, and Part Numbers Final Assembly (Models 1250, 1500, 1750, 2000 and 2500) Final Assembly Models (All Sizes) BACK VIEW... - Page 124 LAARS Heating Systems Page 124 Jacket Parts (Models 1250 and 1500) Jacket Parts (Models 1250 and 1500) Jacket Parts (Models 1250 and 1500) Parts List ITEM Jacket Parts (Model 1750) DESCRIPTION PART NUMBER PANEL, JACKET, REAR 150S3005 PANEL, ACCESS, FLUE...
- Page 125 Jacket Parts (Models 2000 and 2500) HERM Page 125 Control Panel Assembly (Models 1250, 1500, 1750, 2000 and 2500) Jacket Parts (Models 2000 and 2500) PARTS LIST PART NO. ITEM NO. DESCRIPTION 2000 2500 PARTS LIST PART NO. DOOR ASSY, LOWER 300S3104 ITEM NO.
- Page 126 LAARS Heating Systems Page 126 Heat Exchanger Assembly (Models 1250 and 1500) Heat Exchanger Assembly (Models 1250 and 1500) SEE RFC TILE See Refractory WARNING Ceramic Fibers ON PAGE 7 Warning in Section 1.D PARTS LIST ITEM DESCRIPTION 1250 1500 PART NO.
- Page 127 HERM Page 127 Heat Exchanger Assembly (Models 1750, 2000 and 2500) Heat Exchanger Assembly (Models 1750, 2000 and 2500) SEE RFC TILE See Refractory WARNING Ceramic Fibers ON PAGE 7 Warning in Section 1.D PARTS LIST ITEM DESCRIPTION PART NO. SIZE 175S2050 1750...
- Page 128 Page 128 LAARS Heating Systems Gas Train Assembly (Models 1250 and 1500) CSD-1 Version NOTES: NOTES: NOTES: 1. Apply thread sealant to all male NPT threads before assembly. APPLY THREAD SEALANT TO ALL MALE APPLY THREAD SEALANT TO ALL MALE NPT THREADS BEFORE ASSEMBLY.
- Page 129 Page 129 HERM Gas Train Assembly (Models 1750, 2000 and 2500) Gas Train Assembly (Models 1750, 2000 and 2500) CSD-1 Version CSD-1 Version NOTES: NOTES: APPLY THREAD SEALANT TO ALL MALE NOTES: 1. Apply thread sealant to all male NPT threads NPT THREADS BEFORE ASSEMBLY before assembly.
- Page 130 LAARS Heating Systems Page 130 Blower Burner Assembly (Models 1250 and 1500) Parts List ITEM DESCRIPTION 1250 1500 BURNER L2018804 GASKET, BURNER FLANGE S2132900 GASKET, IGNITER-SENSOR S2131900 BACKER PLATE, GASKET, IGNITER-SENSOR 150S5048 IGNITER-FLAME SENSE (includes gaskets and hardware) R2083000 SCREW, 10-32 x 1/2" SHCS, ZINC...
- Page 131 HERM Page 131 Blower Burner Assembly (Models 1750, 2000 and 2500) PART NUMBERS ITEM DESCRIPTION SIZE 1750 SIZE 2000 SIZE 2500 BURNER L2021803 L2021801 L2021801 300S2020 GASKET, BURNER 300S2019 GASKET, ADAPTER FLANGE R2083100 IGNITOR, SPARK, WITH FLAME SENSOR F2057300 SCREW, 8-32 x .375", SHCS, ZINC 400S6904 GASKET, BLOWER OUTLET FLANGE BLOWER, 120V MODELS...
- Page 132 AC Distribution Box (Models 1250 and 1500) LAARS Heating Systems Page 132 208V 220/240V SECONDARY H1 - H4 PRIMARY X1 - X4 AC Distribution Box, Single Phase (Models 1750, 2000 and 2500) AC Distribution Box, Single Phase (Models 1750, 2000 and 2500)
- Page 133 AC Distribution Box, Three Phase (Model 2500) HERM Page 133 AC Distribution Box, Three Phase (Model 2500) AC Distribution Box, Three Phase (Model 2500) PARTS TABLE AC DISTRIBUTION BOX, 3Ø, MODELS 2500 PARTS TABLE AC DISTRIBUTION BOX, 3Ø, MODELS 2500 ITEM 208V 480V...
- Page 134 LAARS Heating Systems Page 134 Water Outlet Assembly (Models 1250 and 1500) PARTS LIST ITEM HYDRONIC VOL WAT DESCRIPTION PART NO. VALVE, SHUT OFF, 3/4" NPT, BRASS R10-143 FLOW SWITCH KIT 150S4030 WELL, IMMERSION, 1/2" NPT RE2058300 SENSOR, TEMPERATURE E2371200 NIPPLE, CLOSE, SS, 3/4"...
- Page 135 HERM Page 135 Water Outlet Assembly (Models 1750, 2000 and 2500) Water Outlet Assembly (Models 1750, 2000 and 2500) Water Outlet Assembly (Models 1750, 2000 and 2500) PARTS LIST PARTS LIST ITEM ITEM HYDRONIC HYDRONIC VOL WAT VOL WAT DESCRIPTION DESCRIPTION PART NO.
- Page 136 All marks have a white outline. Industrial Way, Rochester, NH, USA 03867 • 603.335.6300 • Fax 603.335.3355 Headquarters: 9 Brigden Gate, Halton Hills, Ontario, Canada L7G 0A3 (905) 203-0600 Fax: (905) 636-0666 www.Laars.com Litho in U.S.A. © Laars 22-06 Document 1353B...
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