Laars JVS Installation And Operation Instructions Manual

[Page 1] Laars JVS

M INI- THERM LAARS H0071400Y FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water boiler installation and maintenance. Improper installation and/or operation could create carbon mon...

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LAARS Heating Systems Page 2 TABLE OF CONTENTS SECTION 1. General Information 1.1 Introduction................................................... 3 1.2 Warranty ....................................................... 3 1.3 Codes and Standards...........

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Mini-Therm II Hydronic Boiler Page 3 SECTION 1. General Information 1.1 Introduction This manual provides information necessary for the installation, operation, and maintenance of Laars Model JV copper tube hydronic boilers. All application and insta...

[Page 4] Laars JVS

LAARS Heating Systems Page 4 1. Plumbing materials for the bypass piping, which is required for: a. Any system where the return water temperature may be less than 120°F, such as in-floor radiant systems, snow melt systems or other systems where a �...

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Mini-Therm II Hydronic Boiler Page 5 2.2 Field Assembly 1. Mini-Therm II boilers have built-in draft diverter for natural draft operation. 2. Find the vent damper box which is located in the boiler package. 3. Install the vent damper directly to the ...

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LAARS Heating Systems Page 6 Caution Do not force motor operation when operator is fastened to the damper by moving the damper blade, turning the shaft or by turning the position indicator. Attention Ne pas tourner le registre manuellement avec ou sa...

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Mini-Therm II Hydronic Boiler Page 7 SECTION 3. Venting 3.1 Combustion Air Supply The boiler location must provide sufficient air supply for proper combustion, and ventilation of the surrounding area as outlined in the latest edition of ANSI standard...

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LAARS Heating Systems Page 8 WARNING Vent pipe diameter must be as required by the National fuel Gas Code Z223.1 or the Canadian Installation Codes for Gas Appliances CSA-B149.1. Undersize pipe can result in inadequate venting and oversize pipe can r...

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Mini-Therm II Hydronic Boiler Page 9 WARNING 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 conn...

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LAARS Heating Systems Page 10 SECTION 4. Gas Connections 4.1 Gas Supply and Piping Review the following general instructions before continuing the installation. WARNING The Mini-Therm II JVS and JVT boilers are designed for use with either natural ga...

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Mini-Therm II Hydronic Boiler Page 11 NOTE: The boiler and all other gas appliances sharing the boiler gas supply line must be firing at maximum capacity to properly measure the inlet supply pressure. Low gas pressure could be an indication of an und...

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LAARS Heating Systems Page 12 A full sized, 1¼" bypass with balancing valves is strongly recommended for all systems, and required when: 1) the boiler is installed without primary- secondary piping in a multiple zone system; 2) when the return ...

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Mini-Therm II Hydronic Boiler Page 13 Figure 6. Typical Plumbing Installations. JV From System To System NON-LOW TEMPERATURE SYSTEMS (120°F+ Return Temps) Simple Primary/Secondary Piping - Hydronic - Not Low Temp NOTE: All closed loop systems should...

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LAARS Heating Systems Page 14 Figure 6A. Typical Plumbing Installations. KEY: PUMP CHECK VALVE VALVE ZONE VALVE UNION AUTO AIR BLEEDER Air Scoop JV Boiler Bypass Valve (Ball Valve) Zone Pump Purge System Optional Pump Location Feed Water Inlet Air ...

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Mini-Therm II Hydronic Boiler Page 15 5.3 Flow Requirements All high recovery, low volume water boilers must have adequate flow for efficient operation. Pump selection is critical to this goal, and pumps should be selected to provide for system desig...

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LAARS Heating Systems Page 16 5.4 Chilled Water Systems If the boiler is installed in conjunction with refrigeration systems, it shall be installed so that the chilled medium is piped in parallel with the heating boiler with appropriate valves to pre...

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Mini-Therm II Hydronic Boiler Page 17 1 2 3 4 5 6 BK-BLACK W-WHITE R-RED Y-YELLOW BL-BLUE BR-BROWN O-ORANGE P-PURPLE SPARK IGNITION WIRE 115V-FACTORY WIRED 115V-FIELD WIRED 24V-FACTORY WIRED 24V-FIELD WIRED IF ANY OF THE ORIGINAL WIRE (AS SUPPLIED WI...

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LAARS Heating Systems Page 18 Figure 9c. Wiring Diagram, Standing Pilot System (JVT). Figure 9d. Schematic, Standing Pilot System (JVT). ...

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Mini-Therm II Hydronic Boiler Page 19 SPARK MV MV/PV PV GND 24V (GR) 24V TH-W MV SPARK 1 2 3 4 5 6 7 8 9 W W B B R R LO HI MV C PV HI Pilot Burner With Spark Electrode Sensor Remote Flame Sensor High Altitude (Optional) Two-Stage Aquastat Two-Stage G...

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LAARS Heating Systems Page 20 Figure 10. Multiple Zone Wiring. For primary/secondary pumping: Connect to "W" in lieu of "A." Boiler relay is used for boiler pump and connection to "W" will energize boiler pump when any z...

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Mini-Therm II Hydronic Boiler Page 21 6.3 Grounding WARNING The boiler must be electrically grounded in accordance with the requirements of the authority having jurisdiction or, in the absence of such requirements, with the latest edition of the Nati...

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LAARS Heating Systems Page 22 On continuous pilot ignition models (JVT), if the water temperature is below the limit setting, the ignition module opens the main gas valve, and the main burners ignite. Operation will continue on all ignition systems u...

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Mini-Therm II Hydronic Boiler Page 23 Caution Should overheating occur or the gas supply fail to shut off, do not turn off or disconnect the electrical supply to the pump. Instead, shut off the gas supply at a location external to the appliance. Atte...

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LAARS Heating Systems Page 24 15. Replace control box cover. 16. Restore power to the boiler and adjust the thermostat high enough to call for heat to verify the boiler is operating properly. 17. JVS 100-225 ONLY - Adjust two-stage operating control ...

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Mini-Therm II Hydronic Boiler Page 25 DANGER Read and understand this entire procedure prior to proceeding. Improper adjustment of high altitude shutters may result in a fire, explosion, and/or high levels of toxic gases which may cause property dama...

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LAARS Heating Systems Page 26 1. Lubricate the water circulating pump per the instructions on the pump. 2. If a strainer is employed in a pressure reducing valve or the piping, clean it every six months. 3. At start-up, and periodically thereafter, t...

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Mini-Therm II Hydronic Boiler Page 27 Caution Two-stage Operating Control (JV100-225 ONLY): Factory setting is 140°F (60°C). This setting is correct for most hydronic heating applications. Adjustments to this setting must be made by an authorized s...

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LAARS Heating Systems Page 28 Table 8. Troubleshooting Guide. # Symptom Cause Remedy 1. Pump not A. No power A. Check circuit breakers and power source. operating B.Pump defective B. Replace. C.Incorrectly wired C.Recheck wiring diagrams. 2. Pilot ou...

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Mini-Therm II Hydronic Boiler Page 29 9.3 Troubleshooting Honeywell S8600 Intermittent Pilot System Some boilers may be equipped with an ignition module that shuts off pilot gas if pilot fails to light. To reset, interrupt power to heater Note: Befor...

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LAARS Heating Systems Page 30 9.4 Electrical Troubleshooting 1. Remove the control box cover on the front of the boiler. 2. Verify that 115V is reaching the boiler by testing across the black wire on the pump relay and the white wire on the transform...

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Mini-Therm II Hydronic Boiler Page 31 Heat Distribution Units Transfers heat from the water supplied by the boiler to the area to be heated through the use of baseboard, convector, radiator, finned tube. Also known as "radiation." Isolation...

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LAARS Heating Systems Page 32 Description Model, Size JVS-50 JVT-50 JVS-75 JVT-75 JVS-100 JVT-100 JVS-125 JVT-125 JVS-160 JVT-160 JVS-225 JVT-225 Pilot Gas System Pilot Assy (Nat.) W0030600 W0040900 W0030600 W0040900 W0030600 W0040900 W0030600 W00409...

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Mini-Therm II Hydronic Boiler Page 33 Description Model, Size JVS-50 JVT-50 JVS-75 JVT-75 JVS-100 JVT-100 JVS-125 JVT-125 JVS-160 JVT-160 JVS-225 JVT-225 Water System Heat Exchanger 11046001 11046001 11046002 11046002 11046003 11046003 11046004 11046...

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LAARS Heating Systems Page 34 Figure 15. Parts Identification. 11.3Exploded View Vent Damper Draft Diverter Top Rear Panel Burner with Pilot Bracket Pilot Assembly Gas Manifold Base Assembly Refractory, Rear Refractory, Front Gap Closure HX Access Pa...

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Mini-Therm II Hydronic Boiler Page 35 ...

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H0071400Y A subsidiary of BRADFORD WHITE Corporation 800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors) 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 1869 Sismet Road, Mississauga, Ontario, Canada L4...