Installation and Operation Instructions Document 1254C Installation and Operation Instructions for MINI-THERM Residential Gas-Fired Hydronic Boilers Models JVH, JVS JVS JVH Sizes 50-225 U.S. Patent No. 1,609,692 Canada Patent No. 383,318 Vent damper is optional in some provinces of Canada.. These instructions are to be stored next to the boiler for reference purposes.
LAARS Heating Systems Page 2 TABLE OF CONTENTS SECTION 1. General Information 1A. 1B. 1C. Introduction.....................................................3 Warranty.........................................................3 Heater Identification........................................4 SECTION 2. Boiler Assembly & Placement 2A. 2B. 2C. 2D. 2E. Field Assembly...............................................4 Boiler Placement............................................5 Flooring............................
Page 3 MINI-THERM JV SECTION 1. General Information 1A. Introduction 1B. Warranty This manual provides information necessary for the installation, operation, and maintenance of the Laars Mini-Therm model JV low pressure, copper tube hydronic boilers. These boilers are available in two configurations; the JVH has a hot surface pilot ignition system and the JVS has an electronic intermittent ignition device (I.I.D.).
LAARS Heating Systems Page 4 1C. Heater Identification Consult the rating plate on the right side of the boiler to identify the original characteristics of your unit. 1 2 J V MODEL J V 3 IGNIT SYST S H 4 5 6 SIZE 0 0 1 1 1 2 5 7 0 2 6 2 7 FUEL 0 5 0 5 0 5 N P 8 9 10 FIRING SYST CONST OPTION C D S I J 11 12 U 2 ALTITUDE COUNTRY REVISION S U 2 H I J Table 1. Boiler Model Identification.
Page 5 MINI-THERM JV Vent Damper (JVS only): 1. Mini-Therm JVS 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 top of the draft diverter outlet with the damper operator facing to the front of the boiler, and with the flow direction arrow pointing upward. Use the vent damper wire harness provided with the boiler to connect the vent damper to the boiler.
LAARS Heating Systems Page 6 2D. JVH Dimensional Information Dimensions in inches mm C B 7 180 6 152 2.4 61 25 635 24 610 Size 50 75 100 125 160 225 A B in. mm in. 13-3/8 13-3/8 16-7/8 16-7/8 20-3/8 25-5/8 340 340 429 429 518 651 3-1/8 2-1/4 5-3/4 5-1/2 7-1/4 10 C mm in.
Page 7 MINI-THERM JV 2D. JVS Dimensional Information 24 610 Dimensions in inches mm 7 180 Size A B C D E V 9 -1/4 240 Water Conn Gas Conn in. mm in. mm in. mm in. mm in. mm in.
LAARS Heating Systems Page 8 width and depth of the heater by at least 12 inches (305mm) in all directions. The masonry must be laid with ends unsealed, and joints matched to provide free circulation of air from side to side through the masonry (see Figure 1). If the boiler is installed in a carpeted alcove, the entire floor of the alcove must be covered by a noncombustible platform. Special attention should be paid to clearances between the front of the boiler and the closet door when it is closed.
Page 9 MINI-THERM JV SECTION 3. Air and Venting Boiler Size 3A. 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 U.S. ANSI standard Z223.1 or in Canada, CAN/ CGA-B149.1 or .2, and any local codes that may be applicable.
LAARS Heating Systems Page 10 10 (3.0) OR LESS 2 (0.6) MIN. WALL OR PARAPET CHIMNEY 10 (3.0) OR LESS 2 (0.6) MIN. RIDGE CHIMNEY MORE THAN 10 (3.0) 3 (0.9) MIN. 3 (0.9) MIN. TERMINATION 10 FT. (3.0m) OR LESS FROM RIDGE, WALL OR PARAPET 3 (0.9) MIN. NOTE: NO HEIGHT ABOVE PARAPET REQUIRED WHEN FROM WALLS OR PARAPET IS MORE THAN 10 FT. (3.0m) Dimensions in feet (m). Figure 5. Vertical Vent Termination.
Page 11 MINI-THERM JV or air supply fans. The fans can pick up exhaust flue products from the boiler and return them to the building, creating a possible health hazard. Avoid oversized vent pipe or extremely long runs of the pipe, which may cause excessive cooling and condensation. WARNING Do not store any chemical, cleaners, or other corrosive material near combustion air openings or in the room. Avoid locating dryer vents in the vicinity of combustion air openings.
LAARS Heating Systems Page 12 national and local codes must be followed! The use of thimbles, firestops and other protective devices, when penetrating combustible or noncombustible construction, must be in accordance with all applicable national and local codes. Vertical vents of the induced draft JVH boilers must be installed in accordance with the code requirement for Category 1, Fan Assisted Appliances. Follow the requirements as indicated in the latest edition of ANSI Z223.
SS to PP FSAAUx-xPP *4", 6" & 7" only 2ZDCPVCx** **up to 6" Page 13 MINI-THERM JV Size 50 - 160 Diameter in. mm 4 102 No. of Elbows 4 225 4 102 2 225 6 152 4 Table 2. Horizontal Run Length ft. m 35 10.7 10 3.0 35 10.
LAARS Heating Systems Page 14 SECTION 4. Gas Connections Caution Permanent damage to the gas valve will occur if the following procedures are not followed. 4A Gas Supply and Piping 1. Gas piping installation must be in accordance with the latest edition of ANSI Z223.1 and all local codes. In Canada, the installation must be in accordance with CSA-B149.1 and all local codes that apply. Supply Pressure Natural Gas LP Gas Minimum 5.5 Inches WC Maximum 10.5 Inches WC (1.3 kPa) (2.
Page 15 MINI-THERM JV WARNING The Mini-Therm JVS and JVH boilers are designed for use with either natural gas or LP gas. Check the rating plate to be sure that the boiler is designed to use the type of gas being supplied. DO NOT ATTEMPT TO CONVERT THIS HEATER FOR USE WITH ANY OTHER TYPE OF FUEL. AVERTISSEMENT Les appareils de chauffage à faibles sont conçus pour être utillsés avec du gaz naturel ou du gaz de pétrole liquéfié (GPL).
LAARS Heating Systems Page 16 the two drain plugs located on the lower left side of the boiler. Be sure to include air vent devices located at the highest point in the system to eliminate trapped air, and an air elimination device near the outlet side of the JV boiler. Manual vent valves are recommended. Hot water piping should be supported by suitable hangers or floor stands, NOT by the boiler. Due to expansion and contraction of copper pipe, consideration should be given to the type of hangers used.
Page 17 MINI-THERM JV JV Single Circuit System Multi-Zone Pump System Multi-Zone Valve System Primary Secondary Multi-Zone Pump System JV JV PUMP JV JV Primary/Secondary Multi-Zone Valve System Low Temperature Installation KEY: JV CHECK VALVE Figure 10. Typical Plumbing Installations.
LAARS Heating Systems Page 18 piping, one zone valve and up to eight elbows for single zone systems. Consult the factory or a qualified system designer if you have more fittings or different size or type of pipe. To System From System Balancing Valve Balancing Valve or optional thermostatic union, Laars P/N 2400-030. (Primary/ Secondary only) 1/2" Pipe Size Pump H.P. Left Side View Figure 11. By-pass Piping.
MINI-THERM JV 5 I Low Water Cut Off (LWCO) When this boiler is installed above radiation level, it is required that a Low Water Cut-Off (LWCO) be installed unless this requirement is superceded by Jurisdictional requirements. Specific instructions for the installation are the following: Locate the appropriate wiring diagram within this manual. There are two diagrams, one for the JVH Series and one for the JVS Series. These boilers are available for operation on 115/60 Hz or 220/50 Hz power.
LAARS Heating Systems Page 20 5 J Typical Plumbing Diagrams The preferred piping configuration for JV boilers is always using primary/secondary piping. There are some applications that are acceptable without primary/secondary piping, see below.
Page 21 MINI-THERM JV SECTION 6. 6A. Electrical Wiring Follow these instructions to make the necessary initial electrical connections. 1. Remove the two screws attaching the front cover of the control box. 2. There are wires coiled in the area on the right side of the control box, supplied with wire nuts: black wires and white wires. 3. Follow the schematic in Figures 14A. and 14B.
4 Y P PILOT HSI BL BK R Y 1 2 BOILER SENSOR 3 4 CURVE DHW CALL WWSD HEAT CALL POWER FIELD WIRING 0.4 3 INDUCER FAN 3.6 N/A FINISH N/A MATERIAL: UNLESS OTHERWISE SPECIFIED: TOLERANCES ARE: DECIMALS .X .1 FRACTIONS 1/8" Figure DECIMALS 14A. Wiring .XX .03 Diagram, DECIMALS .XXX .010 ANGLES 1 BR BOX DIVIDER W Y 2.
H Soupape De Gaz HW VR8304 Disconnect for 2 stage operation 2 1 BR Y 4 JUMPER CAVALIER 3 R R Limite Supérieure 1 2 3 PV C MV BK O Y BR Gas Valve HW VR8304 BK Blocked Vent Safety Switch BK (2-STAGE ONLY) BK Roll-Out Switch Limiteur De Retour De Falmme Y 4 5 6 High Limit Power Venter Receptacle See Doc.
LAARS Heating Systems Page 24 JVH 110 VAC R JVS N TEMP CONTROL CONTROL RLY CONTROL RLY BK BL BOILER PUMP BR INDUCER FAN N 110 VAC TEMP CONTROL PUMP 5A MAX R BK TRANSFORMER 110V TRANSFORMER BK R R GND GND 24V FUSE 2A TEMP CONTROL FUSE R 4 2 GAS VALVE 1 TEMP CONTROL R 4 2 DAMPER TEMP CONTROL HI LIMIT BL 3 1 TEMP CONTROL 1 P HI LIMIT FAN PROVING ROLLOUT SW GAS VALVE POWER VENTER BK 4 BLOCKED VENT BK ROLLOUT SW BK IGNITION CONTROL 6 Figure 15A.
Page 25 MINI-THERM JV COM HEAT Wiring with Taco Zone Valves COM HEAT Wiring with Honeywell Zone Valves COM HEAT Wiring with Multiple Zone Pumps Figure 17. Multiple Zone Wiring.
LAARS Heating Systems Page 26 SECTION 7. 7A Filling the System It is crucial to the efficient operation of the system that all air be removed from the circuit. For this reason, an air scoop and vent should be located close to the boiler outlet, and there should be a minimum distance between cold water feed and system purge valve. 1. When the system has been completely installed, close all air vents and open the makeup water valve. Allow the circuit to fill slowly. 2.
Page 27 MINI-THERM JV SECTION 8. Operating Procedures Before placing the boiler in operation, check and reset the safety shutoff devices. Once the boiler is connected to the gas and water piping and after all the requirements in previous pages have been met, follow these procedures: 8A. System Start-up 1. 2. 3. Verify that the pump system is operating properly: a. Shut off the manual gas valve located outside the boiler. b. Raise the wall thermostat high enough to call for heat. c.
Page 28 LAARS Heating Systems 8C.
MINI-THERM JV Page 29 8D.
LAARS Heating Systems Page 30 1. Control Access Panel 2. Figure 18A. 8.E Operating Temperature Controls Note: The Temperature Controllers, the Dip switch panel, and the LED panel can be found under the Control Access Panel after removing the bolts. Two temperature controls are now standard on all JVS and JVH boilers. 1. The primary temperature controller maintains all normal heating operations. 2. A secondary, mechanical high-limit aquastat provides safe shutdown, should the primary controller fail.
Page 31 MINI-THERM JV DHW Operation The boiler target for DHW calls is fixed at 180 deg F. Note: There is no control of a DHW pump, so the boiler pump runs with the call for DHW. Limiting The boiler target is limited to a minimum and a maximum target to ensure that the water temperature does not exceed the limits. 1. Target Min - The boiler target minimum is the point at which the stages will start to turn on to maintain a minimum water temperature.
Page 32 SECTION 9. 9A. Maintenance 1. 2. 3. 4. 5. 6. 7. 8. 9. Lubricate the water circulating pump per the instructions on the pump. If a strainer is employed in a pressure reducing valve or the piping, clean it every six months. At start-up, and periodically thereafter, the burner and pilot flames should be observed. If the flame has the appearance of “sooting” tips, check for debris near the orifices and call the service technician.
Page 33 MINI-THERM JV 9B. Electrical Troubleshooting 1. 2. 3. 4. 5. Remove the control box cover on the front of the boiler. Verify that 115 volts is reaching the boiler by testing across the black wire and the white wire on the transformer. Verify 24 volts transformer output by placing the meter leads on the yellow and red wires. If 24 volts is not evident, replace the transformer. Perform the following series of tests with one meter lead attached to the yellow wire on the transformer.
LAARS Heating Systems Page 34 # Symptom Cause Remedy 1 Pump not operating No power . . . . . Pump defective . . . . . Incorrectly wired . . . . . Check circuit breakers and power source. Replace. Recheck wiring diagrams. 2 Pilot outage Inlet gas pressure too low . . . . . Consult gas utility company. Inlet gas pressure to boiler should be 5.5" (1.4 kPa) to 9.0" (2.2 kPa) water column on natural gas. 10.0" (2.5k Pa) to 14.0" (3.4 kPa) on propane gas.
Page 35 MINI-THERM JV Troubleshooting Honeywell SV9501/SV9601 Hot Surface Pilot System (JVH only) START • TURN GAS SUPPLY OFF • SET THERMOSTAT TO CALL FOR HEAT SV9501/SV9601 IS POWERED (24 VAC NOMINAL) NO YES IGNITER WARMS UP AND GLOWS RED PILOT VALVE OPENS NO CHECK: • LINE VOLTAGE POWER • LOW VOLTAGE TRANSFORMER • LIMIT CONTROLLER • THERMOSTAT • WIRING • FAN PROVING SWITCH ON COMBUSTION AIR BLOWER UNPLUG IGNITER MEASURE VOLTAGE AT TWO BOTTOM TERMINAL OF SV9501/SV9601 (24 VAC NOMINAL) NO REPLACE S
Page 36 LAARS Heating Systems SECTION 10. Replacement Parts 10A Glossary of Terms Air Vent A device used to purge air from the Circuit. Should be located at the highest point in the Circuit. Branch The section(s) of supply and return piping, including the heat distribution units connected directly to the trunk. Also referred to as a “zone”. By-Pass A section of pipe (including an adjustable valve) that diverts part of the water flow from undersized piping to the boiler.
Page 37 MINI-THERM JV 10B Parts List JVH Mini-Therm JVH Description Gas System 1 Pilots Pilot Assembly (Nat.), Hot Surface Pilot Assembly (LP), Hot Surface 2 Burner with Pilot Bracket 3 Main Burner 4 Main Gas Valves Gas Valve, Hot Surface, (Nat.) SV9600H Gas Valve, Hot Surface, (LP) SV9500H 5 Gas Orifices (0-2000 FT.) Nat., Orifices (2001-5000 FT.) Nat., Orifices (5001-8000 FT.) Nat., Orifices (8001-10,000 FT.) Nat., Orifices (0-5000 FT.) LP, Orifices (5001-8000 FT.) LP, Orifices (8001-10,000 FT.
JVi Page 31 LAARS Heating Systems Page 38 26 23 24 25 22 21 13 8 25 7 12 16 15 29 30 27 9 37 36 32 10 31 35 38 18B (left side) 33 32 4 17 18A 14 (right side) 11 34 5 6 2 1 28 19 20 3 Figure 19A. JVH Parts Identification.
Page 39 MINI-THERM JV 10C Parts List JVS Mini-Therm JVS Description JVS-50 JVS-75 JVS-100 R0061600 W0039600 R0061600 W0039600 R0061600 W0039600 R0385100 V0077500 L0052601 L0052500 L0056500 L0055900 R0385100 V0077500 L0052602 L0052500 L0056500 L0055900 L0032200 L0032900 JVS-160 JVS-225 R0061600 W0039600 R0061600 W0039600 R0061600 W0039600 R0407700 V0079100 L0052603 L0052500 L0056500 L0055900 R0407700 V0079100 L0052604 L0052500 L0056500 L0055900 R0407700 V0079100 L0052603 L0052500 L0056500
Mini-Therm JVS LAARS Heating Systems 19 18 9 15 20 7 5 17 8 16 22 23 21 6 26 28 13B 12 (on left side) 25 13A 26 11 2 24 27 29 14 4 1 Figure 19B. JVS Parts Identification. H2355800C 3 800.900.9276 • Fax 800.559.1583 (Customer Service and Product Support) 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130 www.Laars.com Litho in U.S.A.