Laars Mini-Therm JVS (Sizes 50-225) - Install and Operat User Manual

Installation and Operation Instructions Document 1254BInstallation andOperation Instructions for MINI-THERM Residential Gas-Fired Hydronic Boilers

LAARS Heating SystemsPage 10be wired into the boiler control circuit to prevent the boiler from ring unless the blower is operating. The boiler

Mini-Therm JVPage 11of the pipe, which may cause excessive cooling and condensation.3C. Vertical Venting - Category I (JVS and JVH) All venting

LAARS Heating SystemsPage 12 Vertical vents of the induced draft JVH boilers must be installed in accordance with the code requirement for Categ

Mini-Therm JVPage 13Number D2004300 (4”) or D2000401 (6”), must be used when the boiler is vented through a side wall. It provides a means of installi

LAARS Heating SystemsPage 14Figure 8. Gas Supply Piping.HORIZONTALDROPTO BOILERSEDIMENT TRAPOR DRIP LEGTO BOILER RISERSEDIMENT TRAPOR DRIP LEG3"

Mini-Therm JVPage 15SECTION 5.Water Connections5A. Water PipingFigure 10. shows ‘typical’ plumbing installations. Be sure to provide unions and isola

LAARS Heating SystemsPage 16Multi-ZonePumpSystemPrimarySecondaryMulti-ZonePump SystemPrimary/Secondary Multi-Zone Valve SystemLow Temperature Instal

Mini-Therm JVPage 175B By-pass PipingThe following information and suggestions are made on by-pass piping as it affects the temperature rise at the

LAARS Heating SystemsPage 18Figure 11. By-pass Piping.Balancing Valve or optional thermostat-ic union, Laars P/N 2400-030. (Primary/Secondary only)T

Mini-Therm JVPage 19Figure 12. Typical Plumbing Diagrams.JVFromSystemToSystemNON-LOW TEMPERATURE SYSTEMS(120°F+ Return Temps)Simple Primary/Secondary

LAARS Heating SystemsPage 2TABLE OF CONTENTSSECTION 1.General Information1A. Introduction ...31B.

LAARS Heating SystemsPage 20 WARNINGThe boiler must be electrically grounded in accordance with the requirements of the authority having jurisdictio

Mini-Therm JVPage 21Figure 14A. Wiring Diagram, JVH (220V OPT)TRANSFORMER24V 115VRCURVEWWSDDHW CALLHEAT CALLPOWER1234BOILERSENSOR

LAARS Heating SystemsPage 22Figure 14B. Wiring Diagram, JVS4BOILERSENSORSYSCOMOUTHEAT CALLCOM CALLDHW CALL120 VAC LSWITCHED 120 VAC TO PUMP0.42.03.6

Mini-Therm JVPage 23YOBRIGNITION CONTROL2nd STAGE ONLYGAS VALVEMVMV/PVPVHBKTEMP CONTROL35PVC6MVBLOCKEDVENTROLLOUTSWBKBKBKPOWER VENTERHI LIMITBL1DAMPER

LAARS Heating SystemsPage 24COMHEATFigure 17. Multiple Zone Wiring.Wiring with Taco Zone ValvesWiring with Honeywell Zone ValvesWiring with Multiple

Mini-Therm JVPage 25SECTION 7. 7A Filling the System It is crucial to the efcient operation of the system that all air be removed from the circu

LAARS Heating SystemsPage 26SECTION 8.Operating ProceduresBefore placing the boiler in operation, check and reset the safety shutoff devices. Once t

Mini-Therm JVPage 278C. Operating Instructions Mini-Therm JVH

LAARS Heating SystemsPage 288D. Operating Instructions Mini-Therm JVS

Page 298.E Operating Temperature Controls Note: The Temperature Controllers, the Dip switch panel, and the LED panel can be found under the Contro

Mini-Therm JVPage 3SECTION 1.General Information1A. Introduction This manual provides information necessary for the installation, operation, and

LAARS Heating SystemsPage 30 DHW Operation The boiler target for DHW calls is xed at 180 deg F. Note: There is no control of a DHW pump, so th

Mini-Therm JVPage 31SECTION 9.9A. Maintenance1. Lubricate the water circulating pump per the instructions on the pump.2. If a strainer is employed i

LAARS Heating SystemsPage 329B. Electrical Troubleshooting1. Remove the control box cover on the front of the boiler.2. Verify that 115 volts is

Mini-Therm JVPage 33#Symptom Cause Remedy1 Pump not operating No power . . . . .Pump defective . . . . . Incorrectly wired . . . . .Check circuit bre

LAARS Heating SystemsPage 34TURN GAS ON.PILOT BURNER LIGHTS?MAIN VALVE OPENS?SYSTEM OKIGNITER WARMS UPAND GLOWS REDPILOT VALVEOPENSSTART• TURN GAS

Mini-Therm JVPage 35Air VentA device used to purge air from the Circuit. Should be located at the highest point in the Circuit.BranchThe section(s) of

LAARS Heating SystemsPage 36Mini-Therm JVH SizeDescription JVH-50 JVH-75 JVH-100 JVH-125 JVH-160 JVH-225Gas System1 PilotsPilot Assembly (Nat.), Ho

Page 37Mini-Therm JViPage 31ITEMS 14, 39AND INSULATIONNOT SHOWN(left side)(right side)Figure 19A. JVH Parts Identication.252622251615273533383232171

LAARS Heating SystemsPage 38Mini-Therm JVS SizeDescription JVS-50 JVS-75 JVS-100 JVS-125 JVS-160 JVS-225Gas System1 PilotsPilot Assembly (Nat.) R006

Page 39Mini-Therm JVS(on left side)Figure 19B. JVS Parts Identication.1917182078522232242613A13B31429141112252826211615 9627

LAARS Heating SystemsPage 4JVS 1st and 2nd CharaCters (series name) JV = mini-therm3rd CharaCter (ignition system) s = spark ignition4th thru 6t

LAARS Heating SystemsH2355800B800.900.9276 • Fax 800.559.1583 (Customer Service and Product Support)20 Industrial Way, Rochester, NH 03867 • 603.335

Mini-Therm JVPage 5Vent Damper (JVS only):1. Mini-Therm JVS boilers have built-in draft diverter for natural draft operation.2. Find the vent damper

LAARS Heating SystemsPage 6inches mmDimensions inJVH 6152 7180 C B 25635 2.4 61 24610 7180 9 -1/4240Size A B CWaterConnectionGasConnectio

Mini-Therm JVPage 7inches mmDimensions in JVS 6152 7180 C B 25635 2.4 61 24610 7180 9 -1/4240Water Conn Gas ConnSize A B C D E Vin. mm in

LAARS Heating SystemsPage 8 Special attention should be paid to clearances between the front of the boiler and the closet door when it is closed.

Mini-Therm JVPage 9Boiler Size Outside Air Area Inside Air Areasq. insq. cmsq. in.sq. cm50159710064575201291006451002516110064512532206125807160402581