Bradford White LAARS OmniTherm ONH1250 Installation And Operation Instructions Manual
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Bradford White LAARS OmniTherm ONH1250 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 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.
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
Document 1353
®

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Summary of Contents for Bradford White LAARS OmniTherm ONH1250

  • Page 1 Installation and Operation Instructions Document 1353 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 1,750 MBTU/h 1,750 MBTU/h Model ONH2000...

  • Page 2: Table Of Contents

    LAARS Heating Systems Table of Contents SECTION 5 Piping SECTION 1 General Information Introduction ..........5 Boiler Water Piping ........27 Warranty .............5 5.A.1 Boiler Water Connections ......27 Model Identification ........5 5.A.2 Cold Water Make-Up ........27 Safety Notes ..........6 5.A.3 Freeze Protection ........27 Unit Dimensions and Components .....
  • Page 3 HERM SECTION 8 (continued) 8.C.5 Anti-Short Cycle ........60 8.F.2 USB Functionality ........87 8.C.6 Time & Date ..........60 Active Demands ........88 Configuration ..........61 SECTION 9 Gas Valve Touchscreen, 8.D.1 CH (Central Heat) ........62 Menus and Descriptions 8.D.1.a CH1 (Central Heat, One) ......62 About the Gas Valve .........89 8.D.1.a.1 PID Low ............63 8.D.1.a.2 PID High ...........63...
  • Page 4 LAARS Heating Systems...

  • Page 5: Section 1 General Information 1.A Introduction

    HERM ® HERM OmniTherm - Category I / III Vent Page 5 Commercial Boiler / Water Heater ONH & ONV with Laars Linc Control SECTION 1 General Information Standard Features 1.A Introduction 1.B Warranty • ASME "H" stamp (ONH) • Sealed combustion chamber •...

  • 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. Indicates an imminently hazardous situation which, if not WARNING avoided, can or will result in death or serious injury and can...
  • 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.

  • 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 OMT 1.5/1.25 Gas Valve Reset...
  • 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...

  • 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...

  • 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 78.0 65.6...
  • 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...

  • 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 General Venting Info, Cat I and Cat III 2.A.1 Vent and Air Pipe Sizing See Table 2 WARNING Failure to use the appropriate vent material, installation 2.A.2 Combustion Air techniques, or glues and sealants could lead to vent failure causing property damage, personal injury or Boilers and water heaters must have provisions for death.

  • Page 16: Ducted Combustion Air

    LAARS Heating Systems Page 16 ting rmation Typical** Maximum Maximum Category III Air Collar Ducted Air Vent Collar Category I Category III Model Ducted Air Pipe Vent Pipe Size Pipe Size Size Vent Pipe Vent Pipe Length Size Size Length inches inches inches...

  • Page 17: B Category I Venting

    HERM Page 17 2.B Category I Venting 2.B.1 Category I Vent WARNING When vented as a category I appliance, the vent system For indoor installations, as an additional measure must conform to the National Fuel Gas Code (ANSI of safety, Laars strongly recommends installation of Z223.1-Latest Edition) in the U.S., or in Canada, to CSA suitable Carbon Monoxide detectors in the vicinity of B149.1 (latest edition).

  • Page 18: Common Vent Test - Boilers

    LAARS Heating Systems Page 18 the National Fuel Gas Code, ANSI Z223.1 or in Canada, of a match or candle, or smoke from a cigarette, from CSA B149.1 as well as all applicable local codes, it cigar or pipe. is required that installers provide some means to prevent After it has been determined that each appliance operation with a blocked common vent.

  • Page 19: C Category Iii Venting

    HERM Page 19 Category III Approved Venting Component Examples Manufacturer model numbers (abreviated) Selkirk Duravent NovaFlex Component Safet-T Vent EZ Seal FasNSeal Z Flex 90° elbow 9X14 FSELB90xx 2SVEExx90 Pipe 9X07 FSVLxxxx 2SVEPxxxx Horizontal air inlet 9xTERM FSAIHXX* 2SVSTEXxx90 Vertical Termination 5X00CI FSRCx 25VSRCxx...

  • Page 20: D Locating Vent & Comb Air Terminals

    LAARS Heating Systems Page 20 2.D.2 2.D Locating Vent & Combustion Air Side-wall Combustion Air Terminal Category l and lll Terminals Consider the following when installing the terminal. 2.D.1 Side Wall Vent Terminal Do not locate the air inlet terminal near a source of corrosive chemical fumes (e.g., cleaning fluid, Category lll only chlorine compounds, etc.).
  • Page 21 HERM Page 21 *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)

  • Page 22: E Outdoor Installation

    LAARS Heating Systems Page 22 Outdoor Installation This unit can only be installed outdoors in areas that will must be equipped with the inlet air and exhaust terminal never experience freezing temperatures. Precautions kits listed in Table 9. Additional instructions are supplied must be taken to prevent water in the heat exchanger and with the terminal kits.

  • 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 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 2975 2550 2231...

  • Page 27: Section 5 Piping

    HERM Page 27 SECTION 5 Piping 5.A Boiler Water Piping 5.A.1 Boiler Water Connections in the heat exchanger and condensate inside and outside of the boiler from freezing. Damage due to freezing water or NOTE: This unit must be installed in a closed pressure condensate is not covered by the warranty.

  • Page 28: Suggested Boiler Piping Schematics

    LAARS Heating Systems Page 28 5.A.4 Suggested Boiler Piping Schematics 1. If the outlet sensor detects less than 45°F, the control Figure 4 on page 28 through Figure 7 on page 31 show suggested piping configurations for boilers. These energizes the boiler pump. diagrams are only meant as guides.
  • Page 29 HERM Page 29 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 Air vent Water feed controls Expansion tank...
  • Page 30 LAARS Heating Systems Page 30 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 31 HERM Page 31 High temp. Note - 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. Space heating zone circuit Air vent 4 pipe dia.

  • Page 32: Water Heaters

    LAARS Heating Systems Page 32 5.B Water Heaters 5.B.1 5.B.3 Cold Water Make-Up Water Quality Water heaters must be installed in water conditions of The cold water make-up may be connected to the tank 15 gpg hardness or less, with a pH range of 6.5 to 9.5 as shown in Figure 8 through Figure 10.
  • Page 33 HERM Page 33 NOTE: This drawing shows suggested piping configuration and valving. Check with local codes and ordinances for additional requirements. NOTES: 1. Locate the DHW sensor or remote aquastat well in lower 1/3 of tank. 2. Backflow preventer may be required - check local codes. 3.

  • 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. The condensate must be drained from unit. CAUTION A combination condensate drain/trap is included on The supply voltage to this unit must not be...

  • 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 ALARM BELL SYSTEM SUPPLY SYSTEM SUPPLY...

  • Page 37: Power

    HERM Page 37 7.E.1 Power Notice When running the Power and Field Connection 7.E.2 Boiler Pump wiring between the units (Cascade, System If connecting a boiler contactor or pump, use terminals Sensor, Outdoor Sensor, Building Automation, 17 (neutral) and 18 (line voltage). The output of these Etc), always Exit and Enter the wiring through terminals is 120VAC with a maximum output current of the lower back panels so that during future...

  • Page 38: Heat Demands

    LAARS Heating Systems Page 38 7.E.6 Heat Demands running. Contact ratings are 250VAC, 0.6A maximum. (Boiler / Water Heater) Alarm - when used, is connected to terminals 54 (common), 55 (normally closed), and 56 (normally open). CH1/DHW1 - if a thermostat/aquastat or end switch The controller closes the normally open set of contacts (isolated contact only) is used as a heat demand, connect whenever the unit is locked out.
  • Page 39 OUTDOOR OUTDOOR OUTDOOR OUTDOOR OUTDOOR OUTDOOR CH1/DHW1 CH1/DHW1 CH1/DHW1 HERM Page 39 CH1/DHW1 CH1/DHW1 CH1/DHW1 BOILER PUMP (N) 17 BOILER PUMP (N) 17 BOILER PUMP (N) CH2/DHW2 CH2/DHW2 CH2/DHW2 BOILER PUMP (L) 18 BOILER PUMP (L) 18 BOILER PUMP (L) CH2/DHW2 CH2/DHW2 CH2/DHW2...

  • Page 40: Modbus/Bacnet Memory Map

    LAARS Heating Systems Page 40 Modbus/BACnet Memory Map Modbus BACnet BACnet Address Map Descriptor Name Data Object 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 Read...
  • Page 41 HERM Page 41 Modbus BACnet BACnet Address Map Descriptor Name Data Object Read/Write Notes GENERIC LOCKOUT = 17 BURNER1 MAX TRIALS ERROR = 22 BURNER1 MAX FLAME LOST ERROR = 24 BURNER1 FAN SPEED ERROR = 28 NO LOCKOUT = 255 24VDC ERROR = 30 24VAC ERROR = 31 DHW PROBE ERROR = 32...
  • Page 42 LAARS Heating Systems Page 42 Modbus/BACnet Memory Map (continued) Modbus BACnet BACnet Address Map Descriptor Name Data Object Read/Write Notes 0 = Not Present 1 = Not Available Read Lag 5 State Read 2 = Available 3 = Running 4 = Locked Out Read Lag 5 Firing Rate Read...
  • Page 43 HERM Page 43 Modbus BACnet BACnet Address Map Descriptor Name Data Object Read/Write Notes Read/Write CH2 Set Point Read/Write Read/Write CH2 P Read/Write Read/Write CH2 I Read/Write Read/Write CH2 D Read/Write Read/Write DHW Enable/Disable Read/Write 0 = Disable; 1 = Enable; Read/Write DHW Set Point Read/Write Read/Write DHW P...

  • Page 44: Wiring Diagrams - High Voltage

    THIS 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 BY LAARS HEATING SYSTEMS CO.
  • Page 45 REVISIONS HERM Page 45 REV. DRAFT CHECK ENGR DG 3/7/19 RR 3/7/19 SH 3/ 17-152N-03 UPDATED TO ADD FAN TO CONTROL PAN CHANGE: 24VAC TB1-16:3 24L TB1-12:3 24N 24VAC (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 Figure 18. Wiring Diagram, 208, 240V 1 Phase 1250 to 2500...
  • Page 47 HERM Page 47 Figure 19. Wiring Diagram, 208V 3 Phase 2500...
  • Page 48 LAARS Heating Systems Page 48 Figure 20. Wiring Diagram, 480 - 600V 3 Phase 2500...

  • Page 49: Logic Diagrams

    HERM Page 49 7.H Logic Diagrams CONTAINED HEREIN ARE 120VAC (1PH/60Hz) CO.AND SHALL NOT BE OCUMENTS, USED OR NG OR ANY OTHER TB1-17 RIZED IN WRITING BLOWER MOTOR TB1-18 TB1-19 TB1-20 TB1-21 TB1-22 TB1-23 TB1-24 TB1-25 TB1-26 TB1-27 POWER SWITCH TB1-28 TB1-29 POWER INDICATOR...
  • Page 50 LAARS Heating Systems Page 50 EIN ARE 208VAC (3PH/60Hz) NOT BE REV. D OR 17-152 THER TB1-17 POWER Boiler (N) OUTPUTS TB1-18 Pump (L) CHANGE: BLOWER MOTOR TB1-19 TB1-20 Pump TB1-21 System TB1-22 Pump Spare 1 TB1-23 TB1-24 CONTACTS Spare 1 120VAC TRANSFORMER (OUTPUTS) TB1-25...
  • Page 51 HERM Page 51 HEREIN ARE 208/220/240VAC (1PH/60Hz) HALL NOT BE REV. L1 L2 USED OR Y OTHER TB1-17 Boiler (N) POWER TING OUTPUTS CHANGE: 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...
  • Page 52 LAARS Heating Systems Page 52 EIN ARE 480/575/600VAC (3PH/60Hz) NOT BE REV. D OR 17-1 BLOWER MOTOR TB1-17 POWER Boiler (N) CHANGE: 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...
  • Page 53 HERM Page 53 This page intentionally left blank.

  • 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. USER password is lhs.

  • 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. 8.C.1.b CH2 (Central Heat, Two) To navigate to the CH2 Quick Start Screen, touch the CH2 Icon on the CH Quick...

  • 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: D 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: Central Heat)

    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 There are two identical heat demands, CH1 and CH2, each with independent control algorithms and independent inputs on the input terminal strip, see SECTION 7 From the CH Selection Screen, touching CH1 navigates to the CH1...

  • 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 DHW (Domestic Hot Water) To navigate to the DHW/DHW3 Screen, touch the DHW faucet icon on the Configure Screen. DHW/DHW3 has all the same parameters as CH1/DHW1 and CH2/DHW2 with one exception. DHW/DHW3 has the following additional parameter for adjustment: •...

  • 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.B Rotation

    LAARS Heating Systems Page 68 8.D.4.b Rotation To navigate to the Cascade Rotation Screen, touch the Cascade Icon on the Configure Screen, then touch the Rotation Icon on the Cascade Configuration Screen. The Cascade Rotation Screen is a view only screen. This screen indicates how many units are connected in a cascade configuration, the order in which each unit will run, and the percent at which each unit is running.

  • Page 69: D.4.C Redundancy

    C O N F I G U R A T I O N HERM Page 69 8.D.4.c 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 70: Pumps

    C O N F I G U R A T I O N LAARS Heating Systems Page 70 8.D.5 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.5.A Vari-Prime

    C O N F I G U R A T I O N HERM Page 71 8.D.5.a Vari-Prime 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 72: Manual Firing Rate

    C O N F I G U R A T I O N LAARS Heating Systems Page 72 8.D.6 Manual Firing Rate To navigate to the Manual Firing Rate Screen, touch the Manual Firing Rate Icon on the Configuration Screen. The Manual Firing Rate Control Screen allows the adjustment of the following parameters: •...

  • Page 73: D.7.A Delta T Parameters

    C O N F I G U R A T I O N HERM Page 73 8.D.7.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 LAARS Heating Systems Page 74 8.D.8 External The External Configuration Screen applies to the 0-10VDC (4-20mA) analog input BMS 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.8.A External - Remote Set Point

    C O N F I G U R A T I O N HERM Page 75 8.D.8.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.10 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.10.A Demands Priorities

    C O N F I G U R A T I O N HERM Page 77 8.D.10.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 Priority is only active on the lag or stand alone boilers.

  • Page 78: D.10.C Warm Weather

    C O N F I G U R A T I O N LAARS Heating Systems Page 78 8.D.10.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.10.D Com Port, Bms

    C O N F I G U R A T I O N HERM Page 79 8.D.10.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.10.E Temperature Conversion

    C O N F I G U R A T I O N LAARS Heating Systems Page 80 8.D.10.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.11 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 Table 17 on page 101...

  • Page 82: E 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. Analog I/O Input: There are three types of analog inputs;...

  • Page 85: Screen Settings Timeout

    HERM S E R V I C E 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. Follow the calibration procedure as shown on 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: 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 “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 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 utiizes 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: SELECTION AREA: MENU OPTIONS: 9.C Gas Valve Display Navigation and Menus...
  • 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.

  • 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 9.D.6 Load &...

  • 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. Press the Verify Safety Parameters button to proceed to the verification process.
  • Page 99 HERM Page 99...

  • 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 Table 17. ONH (Boiler) Parameter and Range Table (next 2 pages) Minimum Maximum Default Time & Date Hour Minute Month Year CH1 Enable/Disable Disable Enable Enable CH1 Setpoint 130 F 210 F 180 F CH1 On Hysteresis 60 F 25 F...
  • Page 102 LAARS Heating Systems Page 102 Minimum Maximum Default DHW Pump Control Disable Auto/ Always On Auto DHW Pump Post Circulation 0 secs 600 secs 60 secs Auto/ Always On/ Off Disable Auto System Pump Control During DHW System Pump Post Circulation 0 secs 600 secs 60 secs...
  • Page 103 HERM Page 103 Table 18. ONV (Water Heater) Parameter and Range Table (next 2 pages) Minimum Maximum Default Time & Date Hour Minute Month Year DHW1 DHW1 Enable/Disable Disable Enable Enable DHW1 Setpoint 100 F 200 F 180 F DHW1 On Hysteresis 60 F 10 F DHW1 Off Hysteresis...
  • Page 104 LAARS Heating Systems Page 104 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 Disable Auto/ Always On Auto DHW Pump Control DHW Pump Post Circulation 0 secs 600 secs 60 secs...

  • 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. Using the gas valve display Navigate to Home >...

  • 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 Omnitherm 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. Manual-reset condition Measure the resistance of the •...
  • 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.

  • Page 116: Section 14 Replacement Parts

    Final Assembly (Models 1250, 1500, 1750, 2000 and 2500) LAARS Heating Systems Page 116 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) BACK VIEW...
  • Page 117 HERM Page 117 Jacket Assembly (Models 1250 and 1500) Jacket Assembly (Models 1250 and 1500) BOM Table ITEM DESCRIPTION PART NUMBER QTY PANEL, JACKET, REAR 150S3005 PANEL, ACCESS, FLUE 150S2229 FILTER ASSY, AIR INTAKE 150S2610 PANEL, JACKET, RIGHT 150S3006 PANEL, JACKET, LEFT 150S3007 PANEL, JACKET, TOP 150S3008...
  • Page 118 LAARS Heating Systems Page 118 Jacket Parts (Model 1750) PARTS LIST ITEM DESCRIPTION CAT I QTY PART NO. DOOR ASSY, DISPLAY 175S3102 DOOR ASSY, LOWER 175S3104 FILTER ASSY, AIR INTAKE 250S2500 PANEL, JACKET, RIGHT, LOWER 175S3002 PANEL, JACKET, LEFT, LOWER 175S3018 PANEL, JACKET, RIGHT, UPPER 175S3004...
  • Page 119 HERM Page 119 Jacket Parts (Models 2000 and 2500) PARTS LIST ITEM DESCRIPTION QTY PART NO. DOOR ASSY, LOWER 300S3104 DOOR ASSY, DISPLAY 300S3102 DOOR ASSEMBLY UPPER 250S3023 FILTER ASSY, AIR INTAKE 250S2500 PANEL, JACKET, LEFT, LOWER 300S3018 PANEL, SIDE, UPPER LEFT 250S3021 PANEL, JACKET, RIGHT, LOWER 300S3002...
  • Page 120 Control Panel Assembly (Models 1250, 1500, 1750, 2000 and 2500) LAARS Heating Systems Page 120 Control Panel Assembly (Models 1250, 1500, 1750, 2000 and 2500) PARTS LIST ITEM DESCRIPTION PART NO. PARTS LIST ITEM SWITCH, CUTOFF, LOW WATER E2387600 DESCRIPTION PART NO.
  • Page 121 HERM Page 121 Heat Exchanger Assembly (Models 1250 and 1500) Heat Exchanger Assembly (Models 1250 and 1500) SEE RFC TILE WARNING ON PAGE 7 PARTS LIST ITEM DESCRIPTION 1250 1500 PART NO. SHROUD ASSEMBLY R2082900 125S2141 HEAT EXCHANGER 150S2141 BLANKET, INSULATION 150S2182 TEMPERATURE SENSOR E2387700...
  • Page 122 LAARS Heating Systems Page 122 Heat Exchanger Assembly (Models 1750, 2000 and 2500) Heat Exchanger Assembly (Models 1750, 2000 and 2500) SEE RFC TILE WARNING ON PAGE 7 PARTS LIST ITEM DESCRIPTION PART NO. SIZE 175S2050 1750 HEAT EXCHANGER 250S2050 2000 &...
  • Page 123 HERM Page 123 Gas Train Assembly (Models 1250 and 1500) CSD-1 Version NOTES: NOTES: APPLY THREAD SEALANT TO ALL MALE APPLY THREAD SEALANT TO ALL MALE NPT THREADS BEFORE ASSEMBLY NPT THREADS BEFORE ASSEMBLY O-RINGS INCLUDED WITH GAS VALVE. O-RINGS INCLUDED WITH GAS VALVE. ITEM 6 FOR USE IN MASSACHUSETS ITEM 6 FOR USE IN MASSACHUSETS Parts List...
  • Page 124 LAARS Heating Systems Page 124 Gas Train Assembly (Models 1750, 2000 and 2500) CSD-1 Version NOTES: NOTES: APPLY THREAD SEALANT TO ALL MALE APPLY THREAD SEALANT TO ALL MALE NPT THREADS BEFORE ASSEMBLY NPT THREADS BEFORE ASSEMBLY O-RINGS INCLUDED WITH GAS VALVE O-RINGS INCLUDED WITH GAS VALVE ITEM 6 FOR USE IN MASSACHUSETS ITEM 6 FOR USE IN MASSACHUSETS...
  • Page 125 HERM Page 125 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 F2057200 GASKET, BURNER S2131100...
  • Page 126 LAARS Heating Systems Page 126 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...
  • Page 127 HERM Page 127 AC Distribution Box (Models 1250 and 1500) 220/240V SECONDARY H1 - H4 PRIMARY X1 - X4 208V Bill of Material ITEM 208V 1Ø 220/240V DESCRIPTION PART NO. 1Ø QTY CIRCUIT BREAKER, 7 AMP, PANEL MOUNT E2378600 DIN RAIL ASSY, 208/220/240V 1Ø 300S731702 TRANSFORMER, 208 X 416 PRIM, 120 X 240 SEC, 500 VA, 50/60HZ E2385300...
  • Page 128 LAARS Heating Systems Page 128 AC Distribution Box, Single Phase (Models 1750, 2000 and 2500) AC Distribution Box, Single Phase (Models 1750, 2000 and 2500) PARTS TABLE AC DISTRIBUTION BOX, 1Ø, MODELS 1750, 2000, AND 2500 ITEM 120V 208V 220/240V DESCRIPTION PART NO.
  • Page 129 HERM Page 129 AC Distribution Box, Three Phase (Model 2500) PARTS TABLE AC DISTRIBUTION BOX, 3Ø, MODELS 2500 ITEM 208V 480V 575/600V DESCRIPTION PART NO. FAN, AXIAL, 4-11/16" SQUARE, 1-1/2" DEEP, 115VAC E2376300 TRANSFORMER, 208 X 416 PRIM, 120 X 240 SEC, 500 VA, 50/60HZ E2385300 TRANSFORMER, HPS, SP2000ACP, Prim 600/480V, Sec 120x240 E2382900...
  • Page 130 LAARS Heating Systems Page 130 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 131 HERM Page 131 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 PARTS LIST PARTS LIST ITEM ITEM HYDRONIC HYDRONIC VOL WAT VOL WAT ITEM ITEM...
  • Page 132 HERM Notes: Color All Manuals (Install & The AHRI Certified™ mark is designed Operate, Start Up, and For Laars Product and contained. Artwork is provided for you Service Manuals) can Service VIDEOS be downloaded at Select the appropriate file for use base please contact AHRI’s Certification Pro Generic Marketing Application PMS 300, C=100, M=42, Y=0, K=0, R=0, G=101, B=189, HTML: #0065BD...

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