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Installation and Operation Instructions
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water boiler and heater installation and maintenance. Improper installation and/or operation
could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or
death. Improper installation and/or operation will void the warranty.
If the information in this manual is not followed
exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
nearby phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call the
fire department.
Installation and service must be performed by
a qualified installer, service agency, or gas supplier.
Installation and Operation Instructions for
WARNING
M
-T
INI
HERM
JX
Residential
Gas-Fired
Hydronic Boilers
Sizes 50-200 MBTU/h
AVERTISSEMENT
Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d'incendie ou d'explosion ou
pour éviter tout dommage matériel, toute blessure
Ne pas entreposer ni utiliser d'essence ni d'autres
vapeurs ou liquides inflammables dans le voisinage
de cet appareil ou de tout autre appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d'allumer d'appareils.
• Ne touchez à aucun interrupteur. Ne pas vous servir des
téléphones dansle bâtiment où vous êtes.
• Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions du
fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de gaz,
appelez le sservice des incendies.
L'installation et l'entretien doivent être assurés par un
installateur ou un service d'entretien qualifié ou par le
fournisseur de gaz.
Document 1478B
®
ou la mort.
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Related Manuals for Laars MINI-THERM JX
Summary of Contents for Laars MINI-THERM JX
- Page 1 Installation and Operation Instructions Document 1478B Installation and Operation Instructions for HERM ® Residential Gas-Fired Hydronic Boilers Sizes 50-200 MBTU/h FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water boiler and heater installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death.
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Page 2: Table Of Contents
LAARS Heating Systems TABLE OF CONTENTS SECTION 7 ELECTRICAL AND SECTION 1 GENERAL INFORMATION WIRING DIAGRAMS Introduction ..........4 Safety Warnings ........23 Warranty ..........4 Main Power, 120V / 15 Amp Circuit ..23 Model Number and Nomenclature ..4 Outdoor Sensor ........ - Page 3 JX Residential Boilers INI- HERM ® Advanced Programing ....... 32 8.B.1 Fahrenheit or Celsius ......32 8.B.2 Low Water Cut-Off ........ 32 8.B.2.a RESET, Manual or Automatic ....32 8.B.2.b Testing Low Water Cut OFF ....33 8.B.3 High Limit Differential ......33 Sensor Programming ......
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Page 4: Section 1 General Information 1.A Introduction
1.B Warranty P = 50-100 with Pump Kit 8th Character (Altitude in Feet) The Laars Mini-Therm JX boilers are covered by a limited warranty. The owner should complete the X = (0 - 2,000) warranty registration online by going to www.Laars. -
Page 5: D Safety Warnings
JX Residential Boilers Page 5 INI- HERM ® 1.D Safety Warnings Safety Warnings are used throughout this manual to bring attention to the presence of hazards with various risk levels and to off er important information concerning the life of this product. There are 3 basic types. Indicates an imminently hazardous situation which, if not WARNING avoided, can or will result in death or serious injury and can... -
Page 6: E Model Overview
Page 6 LAARS Heating Systems 1.D Safety Warnings (continued) WARNING The Rep Electrical Shock Hazard WARNING refractor Electrical shock can cause severe injury, death or as a pos The Repair Parts list designates parts that contain property damage. Disconnect the power supply before tempera refractory ceramic fi... - Page 7 JX Residential Boilers Page 7 INI- HERM ® Model Overview (continued) Hydronic Return Hydronic Supply Low Loss Header (sizes 125 - 200) Vent Damper Pressure Gauge Panel Lock The Digital Dashboard See 8.A on page 30 Drain Rating Plate Pressure Relief Valve ‘Knock-outs’...
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Page 8: F Pressure Gauge
Page 8 LAARS Heating Systems Pressure Gauge The Pressure gauge is installed just above the Digital Dashboard. The pressure is sensed at the top front section of the inlet/outlet header. Figure 4. System Pressure 1.G Digital Dashboard The Digital Dashboard displays the boiler's status while it is running. - Page 9 IN (Return) Dimensional JX Residential Boilers Page 9 INI- HERM ® 1-1/4” NPT Male IN (Return) Data 1-1/4” NPT Male OUT (Supply) Out Supply 1-1/4” NPT Male 7" OUT (Supply) In Return 18cm 1.J Dimensions Out Supply (continued) 1-1/4” NPT Male 7"...
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Page 10: Section 2 Locating The Boiler
Page 10 LAARS Heating Systems SECTION 2 LOCATING THE BOILER 2.A Field Assembly A minimum of 15” (381mm) access must be This boiler is shipped with an automatic vent damper that available in front of the boiler for burner removal. -
Page 11: Section 3 Air And Venting
JX Residential Boilers Page 11 INI- HERM ® SECTION 3 Air and Venting 3.A Safety Warnings WARNING WARNING This boiler must be vented in accordance with Part For Category I, II and IV boilers, have horizontal runs sloping upwards not less than ¼ inch per foot (21 mm/m) 7, Venting of Equipment, of the latest edition of the from the boiler to the vent terminal. -
Page 12: B Combustion Air Supply
Page 12 LAARS Heating Systems 3.B Combustion Air Supply Boiler Size Outside Air Area Inside Air Area The boiler location must provide sufficient air supply for sq. in sq. in. sq. cm sq. cm proper combustion, and ventilation of the surrounding area as outlined in the latest edition of U.S. -
Page 13: C Venting
JX Residential Boilers Page 13 INI- HERM ® 10 (3.0) OR LESS MORE THAN 10 (3.0) 2 (0.6) MIN. 3 (0.9) 3 (0.9) MIN. MIN. WALL OR WALL OR PARAPET TERMINATION PARAPET CHIMNEY 10 FT. (3.0m) CHIMNEY OR LESS FROM RIDGE, NOTE: NO HEIGHT WALL OR PARAPET 10 (3.0) -
Page 14: Vertical Venting - Category I
Page 14 LAARS Heating Systems 3.D Vertical Venting - Category I WARNING All venting must comply with fuel gas code and be Do not store any chemical, cleaners, or other installed by a licensed installer. corrosive material near combustion air openings or in the room. -
Page 15: Locations For Vent Pipe Terminator
JX Residential Boilers Page 15 INI- HERM ® 3.E Locations for Vent Pipe Terminator 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 ●... -
Page 16: Venting With A Power Venter
Page 16 LAARS Heating Systems Venting with a Power Venter 3.G Évent Commun This boiler is certified for use with the manufacturer's suggested Power Venter, which is supplied in a kit that AVERTISSEMENT includes Installation Instructions. See the accessories Lorsqu'une chaudière existante est retirée d'un list in the Parts Section of this manual. -
Page 17: Section 4 Gas Connections
JX Residential Boilers Page 17 INI- HERM ® SECTION 4 Gas Connections 4.A Gas Supply and Piping Follow this guideline checklist for the gas supply installation. CAUTION 1. Gas piping installation must be in accordance Permanent damage to the gas valve will occur if the with the latest edition of ANSI Z223.1 and all local following procedures are not followed. -
Page 18: Lp Gas Conversion Kit
Page 18 LAARS Heating Systems NOTE: The boiler and all other gas WARNING appliances sharing the boiler gas supply line must be firing at maximum capacity to The boiler is designed for use with either natural properly measure the inlet supply pressure. -
Page 19: Pump Sizing With Low Loss Header And An Integral Pump
36.6 31.1 26.7 1-1/4 44.0 37.2 32.2 1-1/4 58.3 49.2 42.8 1-1/4 JX Residential Boilers Page 19 INI- HERM ® Note: The Net AHRI Water Ratings shown are based on a piping and pickup allowance of 1.15. * Add approximately 9 Lbs for unit with pump. SECTION 5 PUMP REQUIREMENTS This boiler has a water tube design, and requires NOTE: Field Supply System / Zone pump(s) for all... -
Page 20: Section 6 Water Connections 6.A Water Piping
Page 20 LAARS Heating Systems SECTION 6 WATER CONNECTIONS 6.B Oxygen Permeable Systems 6.A Water Piping This boiler must not be directly connected to a heating NOTE: This boiler must be installed in a closed system utilizing oxygen permeable tubing. Provide a pressure system with a minimum of 12 psi (82.7kPa) -
Page 21: Typical Plumbing Diagrams
JX Residential Boilers Page 21 INI- HERM ® 6.D Typical Plumbing Diagrams These diagrams are only meant as a guide. All components or piping required by local code must be installed. Check Check Valves Air Scoop Valves Air Scoop Air Scoop Valv Air Scoop Valves... - Page 22 Page 22 LAARS Heating Systems Typical Plumbing Diagrams (continued) Check Air Scoop Valves Valves Drains Zone Pumps (must be sized properly) Pump Valves Valves Check Valve Low Loss Header w/ Pump Indirect Tank Figure 16. Low Loss Header with Zone Pumps and DHW Low Loss Header is standard on models 125, 150, and 200 and Optional for models 50, 75, and 100.
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Page 23: Electrical And Wiring Diagrams Safety Warnings
Natural Gas AFUE % Size MBTU/h kW MBTU/h kW MBTU/h inches inches 116* 136* 14.7 12.6 10.8 1-1/4 JX Residential Boilers Page 23 INI- HERM ® 127* 148* 1-1/4 22.0 18.8 16.1 141* 153* 1-1/4 29.3 24.9 21.4 SECTION 7 ELECTRICAL AND WIRING DIAGRAMS 1-1/4 36.6 31.1... -
Page 24: Field Connections
Page 24 LAARS Heating Systems 7.D Field Connections This boiler has three Field Connection Terminals. TB1, TB2 and TB3 (TB3 is for optional equipment). Open TB2 - 120 VAC Outputs Closed TB3 -DHW Relay Connections (optional) TB1 -TT, DHW, OAS Figure 19. -
Page 25: Tb2 (For Pumps And Aux Power)
JX Residential Boilers Page 25 INI- HERM ® Pump contacts rated to 5.8 FLA. 7.D.2 TB2 (for pumps and aux power) 7.D.2.a Boiler Pump This terminal and the 120V(N) terminal will provide power to the boiler pump whenever the boiler is running. Use this to power the Low Loss Header (LLH) pump or a boiler pump in a Primary/Secondary application. -
Page 26: Wiring Connections, Power Vent And Air
Figure 24. Combustion Air System L1 N T1 T2 T3 wiring example Example: Laars Power Vent Kit and Fields Controls CAS-4 Wiring to JX UC-1 Power Vent Kit Control Panel Combustion Air System Combus�on Air System Example: Laars Power Vent Kit and Fields Controls CAS-4 Wiring to JX... - Page 27 JX Residential Boilers Page 27 INI- HERM ® Laars Power Vent Kit 24 V Field Wiring. NOTE: The total power requirement of the Zone Valves should not exceed the total capacity of the transformers. See Zone Valve Three Wire Zone Valves need an...
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Page 28: Wiring Diagram
Page 28 LAARS Heating Systems Wiring Diagram CUSTOMER POWER CONNECTION 120VAC TRANSFORMER 24VAC DAMPER CONNECTOR Boiler Controller BLOCKED VENT ROLL OUT SWITCH SWITCH PILOT VALVE 24V (L) GAS VALVE MAIN VALVE 24V (N) 24V (L) 120VAC FACTORY INSTALLED JUMPERS: WARNING... -
Page 29: Logic Diagram
JX Residential Boilers Page 29 INI- HERM ® 7.G Logic Diagram WARNING No Power to be applied to terminals 10-12 of TB1. 120VAC (1PH/60Hz) Sensor Connections Only! 10K OHM L1 N SENSOR INPUTS WWSD FIELD 24V (N) PV2 INPUTS Field AUX POWER TB2:5A TB2:3A... -
Page 30: Section 8 The Digital Dashboard
Page 30 LAARS Heating Systems SECTION 8 THE DIGITAL DASHBOARD 8.A Getting to know the Digital Dashboard. NOTE: Most installations will not require setting anything within the Digital Dashboard. The reasons for lifting the small transparent cover and adjusting the control are: Figure 31. -
Page 31: Economy Dial (No Outdoor Sensor Needed)
Decimal lights on a call for heat. JX Residential Boilers Page 31 INI- HERM ® L E D s Control, Digital and Ignition For full details, See Section 8.A.5 on page 31 The Ignition LED’s light in sequence Mode LEDs light in sequence. ECONOMY Settings HI LIMIT LO LIMIT... -
Page 32: Ignition Leds
LAARS Heating Systems Page 32 See Figure 32 8.A.7 Ignition LEDs 8.A.7.a LIMITS Illuminates on a call for heat to indicate the limits are satisfied. Limits may include flame rollout, spill switch, Mode field interlock terminals (secondary low water cutoff etc). -
Page 33: B.2.B Testing Low Water Cut Off
Feature Options Description Setting Setting Degrees Fahrenheit Fahrenheit or Celsius OPTIONAL FEATURES continued JX Residential Boilers Page 33 INI- HERM ® Degrees Celsius LWCO Manual or Automatic Reset Automatic Reset Manual Reset Dial Default When in the Automatic Reset Mode, the boiler Feature Options Description... -
Page 34: Adjusting Outdoor Reset Ratio
Page 34 LAARS Heating Systems To set the desired warm weather shutdown temperature: Press and hold the Mode button and 8.C.4 simultaneously adjust the ECONOMY dial to the Thermal Boost Function desired temperature setting. To turn warm weather shutdown of f - which will allow 8.C.4.a Outdoor Reset... -
Page 35: C.4.B Thermal Targeting
JX Residential Boilers Page 35 INI- HERM ® 8.E View Current Settings Example: If the thermostat is not satisfied thirty down. The boiler water will continue to circulate and heat the The Mode button has several functions when TEMP ACTIVE Indicates that the Fuel Smart minutes after the boiler reaches the reset temperature, house as long as the thermostat call continues. -
Page 36: Section 9 Initial Startup
Page 36 LAARS Heating Systems SECTION 9 INITIAL STARTUP WARNING Carbon monoxide hazard. The vent damper must be 9.A Filling the System fully open and the flue must be clear before the main burner fires. If the burner fires when the vent damper... - Page 37 JX Residential Boilers Page 37 INI- HERM ® NOTE Always test for a complete electrical system ground. High voltage ignition can cause electrical interference if not properly grounded. WARNING Electrical shock hazard. The ignition circuit of the Air shutter control can produce over 10,000 volts which can locking cause severe injury or death.
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Page 38: C Proper Pilot Flame
Page 38 LAARS Heating Systems 9.C Proper Pilot Flame To view the pilot flame, the cover must be unlocked Open and removed. A properly adjusted pilot should have a blue, steady flame with an inner cone that engulfs 3/8” - 1/2” of the pilot ignitor sensor. See Figure 45 The pilot ignitor sensor should glow bright orange from the heat and the flame current should be 1.0 μA to 1.8 μA. -
Page 39: D Lighting Instructions Decal
JX Residential Boilers Page 39 INI- HERM ® FOR YOUR SAFETY READ BEFORE OPERATING 9.D Lighting Instructions WARNING: If you do not follow these instructions exactly, a fire or explosion Decal may result causing property damage, personal injury or loss of life. A. -
Page 40: E System Shutdown
Page 40 LAARS Heating Systems 9.E System Shutdown Turn off the main electrical disconnect switch. Close all manual gas valves. These boilers are certified for indoor use only and should not be subjected to freezing temperatures. When shutdown or during and extended power outage, component failure or other condition when freezing is likely, the boiler and system must be drained. -
Page 41: Side Panel Removal
JX Residential Boilers Page 41 INI- HERM ® 10.A.3 Side Panel Removal Remove the front access and the top as described previously. Drain the boiler and remove the drain valve and/or the PRV and associated fittings depending on the panel being removed. -
Page 42: B Maintenance
Page 42 LAARS Heating Systems 10.B Maintenance these basic items listed be inspected by a qualified WARNING service technician every year. a. Water temperature controls. The Warranty does not cover damage caused by lack of required maintenance, lack of water flow, b. -
Page 43: Operating Details And Troubleshooting
JX Residential Boilers Page 43 INI- HERM ® SECTION 11 Operating Details and Troubleshooting 11.A Operating Details CAUTION When power is turned on, the digital display will indicate Label all wires prior to disconnection when the boiler outlet temperature. If a demand for heat is servicing controls. -
Page 44: C Troubleshooting Table
Page 44 LAARS Heating Systems 11.C Troubleshooting Table Symptom Cause Remedy Boiler Pump not No power. Check circuit breakers and power source. Replace. Recheck wiring Pump defective. diagrams (System pump will not work if below 160ºF or if DHW call) operating Incorrectly wired. -
Page 45: D Troubleshooting Flow Charts
Troubleshooting Flow Chart 1 – Burner Will Not Fire JX Residential Boilers Page 45 INI- HERM ® 11.D Troubleshooting Is the The Temp Active LED will be on at all times when the control is powered. Green LED Flow Charts The Control is Check for 120 VAC on the control input. -
Page 46: Troubleshtng Flow Chart 1 (Burners Off)
Check vent damper, end switch, and check TB1, PV1 + PV4 should be closed by a jumper or a switch from an external Replace Control power vent kit or combustion air end switches. Page 46 LAARS Heating Systems from previous page Is there spark at the pilot? Troubleshooting Flow Check gas pressure to the pilot. -
Page 47: E Glossary Of Terms
JX Residential Boilers Page 47 INI- HERM ® 11.E Glossary of Terms Air Vent Temperature Controllers A device used to purge air from the circuit. It should be The primary temperature controller maintains all located at the highest point in the circuit. normal heating operations. -
Page 48: Replacement Parts
Page 48 LAARS Heating Systems SECTION 12 REPLACEMENT PARTS 12.A Parts List Jacket Components Jacket Components Panel, Top, Panel, Top, Front R5X3032 R7X3032 R10X3032 R12X3032 R15X3032 R20X3032 Panel, Le� Panel, Left Side R5X3043 R5X3043 R5X3043 R5X3043 R5X3043 R5X3043 Panel, Panel, Front 5X3038 7X3038 10X3038 12X3038 15X3038... - Page 49 JX Residential Boilers Page 49 INI- HERM ®...
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Page 50: B Accessories List
RV2030700 RV2030700 RV2030700 RV2030700 RV2030700 RV2030700 RV2030700 RV2030700 RV2030700 RV2030700 RV2030700 RV2030700 Page 50 LAARS Heating Systems Pilot orifice (LP) 0 - 10,000' W2001700 W2001700 W2001700 W2001700 W2001700 W2001700 Gas Valve, Regulator Spring(LP) Gas Valve, Regulator Spring(LP) V2015100 V2015100 V2015100... - Page 51 F203280 1-106 E240330 E240210 F003590 H241070 H241060 REVISIONS THIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE PROPRIETARY TO LAARS HEATING SYSTEMS E010180 REV. DRAFT CHECK AND SHALL NOT BE REPRODUCED, TRANSFERED 20-026N-01 JM 6JUL20 CF 6JUL20 TO OTHER DOCUMENTS, USED OR DISCLOSED...
- Page 52 Customer Service and Product Support: 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 Heating Systems 22-06 Document 1478B...