Installation and Operation Instructions Document 1254B 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............................
Mini-Therm JV SECTION 1. General Information 1A. Introduction This manual provides information necessary for the installation, operation, and maintenance of the Laars 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.). Look for the model designation on the rating plate, which can be found on top of the boiler.
LAARS Heating Systems Page 4 1C. Heater Identification Consult the rating plate on the boiler. The following example simplifies the heater identification: 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 FIRING SYST CONST OPTION C D S P I J 10 11 12 U 2 ALTITUDE COUNTRY REVISION S I J U 2 Table 1. Boiler Model Identification.
Mini-Therm JV Page 5 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.
Page 6 LAARS Heating Systems JVH 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.
Mini-Therm JV JVS Page 7 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. 2E.
Mini-Therm JV Page 9 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. WALL OR PARAPET NOTE: NO HEIGHT ABOVE PARAPET REQUIRED WHEN FROM WALLS OR PARAPET IS MORE THAN 10 FT. (3.0m) Dimensions in feet (m). CHIMNEY MORE THAN 10 (3.0) 10 (3.0) RIDGE 2 (0.6) MIN. 3 (0.9) MIN. CHIMNEY Figure 5. Vertical Vent Termination.
Mini-Therm JV Page 11 of the pipe, which may cause excessive cooling and condensation. 3. 3C. Vertical Venting - Category I (JVS and JVH) 4. All venting must comply with fuel gas code and be installed by a licensed professional. The Mini-Therm JVS or JVH series boiler can be vented into a masonry chimney, (see Figure 2) provided several conditions are met: 1. The chimney must have an appropriate tile lining that is clean, properly constructed and properly sized. 2.
LAARS Heating Systems Page 12 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 Z223.1/NFPA 54, sizing of Category I Venting System and Appendix G, or in Canada, follow the instruction of CAN/CGA-B149 installation code. An unused lined chimney can be used as a raceway for single wall vent pipe, (see Figure 3).
Mini-Therm JV Page 13 Number D2004300 (4”) or D2000401 (6”), must be used when the boiler is vented through a side wall. It provides a means of installing vent pipe through the building wall, and must be located in accordance with ANSI Z223.1/NFPA 54, or in Canada CAN/ CGA-B149 and local applicable codes, (see Figure 6 ). Locate the vent terminal so that it cannot be blocked by snow. Most codes requires termination of at least 12” (305mm) above grade, but the installer must follow local codes. 3.
LAARS Heating Systems Page 14 1. 2. 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. Check the gas supply to be sure that it is the same as the gas indicated on the boiler’s plate. Mini-Therm JVS and JVH boilers, as shipped from the factory, are certified to operate within the altitude range indicated on the rating plate.
Mini-Therm JV 4. 5. 6. 7. A sediment trap (drip leg) must be installed ahead of the gas controls (see Figure 8). Fit the trap with a threaded cap which can be removed for cleaning. Install a manual gas shutoff valve for service and safety. Do not use a restrictive gas cock. Flexible gas connectors, if used, must be CSA rated for the total input rating of the boiler.
LAARS Heating Systems Page 16 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.
Mini-Therm JV Page 17 15°F 8°C Size Flow Rate 20°F 11°C Headloss Flow Rate 25°F 14°C Headloss Flow Rate Headloss gpm l/s ft m gpm l/s ft m gpm l/s ft m 50 5.3 0.3 0.3 0.1 4 0.3 0.2 0.1 3.2 0.2 0.1 0 75 8 0.5 0.6 0.2 6 0.4 0.3 0.1 4.8 0.3 0.2 0.1 100 10.7 0.7 1.3 0.4 8 0.5 0.7 0.2 6.4 0.4 0.5 0.2 125 13.3 0.8 2.2 0.7 10 0.6 1.3 0.4 8 0.5 0.8 0.2 160 17 1.1 2.5 0.8 12.8 0.8 1.8 0.5 10.2 0.6 1.2 0.4 225 24 1.5 5 1.
LAARS Heating Systems Page 18 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.
Mini-Therm JV Page 19 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.
LAARS Heating Systems Page 20 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 BK BK-NOIR W-BLANC R-ROUGE Y-JAUNE BL-BLEU BR-BRUN O-ORANGE P-MAUVE G-VERT Y HI FAN FLAME LIMIT PROVING ROLL OUT O BK-BLACK W-WHITE R-RED Y-YELLOW BL-BLUE BR-BROWN O-ORANGE P-PURPLE G-GREEN HIS DOCUMENT AND THE INFORMATION CONTAINED HEREIN ARE ROPRIETARY TO LAARS HEATING SYSTEMS CO.AND SHALL NOT BE EPRODUCED, TRANSFERRED TO OTHER DOCUMENTS, USED OR ISCLOSED TO OTHERS FOR MANUFACTURING OR ANY OTHER URPOSE EXCEPT AS SPECIFICALLY AUTHORIZED IN WRITING Y LAARS HEATING SYSTEMS CO.
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 Y Roll-Out Switch Limiteur De Retour De Falmme Power Venter Receptacle See Doc.
Mini-Therm JV Page 23 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 24 LAARS Heating Systems 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.
Mini-Therm JV Page 25 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.
LAARS Heating Systems Page 26 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.
Mini-Therm JV Page 27 8C.
Page 28 LAARS Heating Systems 8D.
Page 29 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.
LAARS Heating Systems Page 30 control is in WWSD the DHW call will be satisfied. WWSD LED turns on when control detects WWSD. 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.
Mini-Therm JV 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 32 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.
Mini-Therm JV Page 33 # 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.
LAARS Heating Systems Page 34 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 R
Mini-Therm JV Page 35 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.
LAARS Heating Systems Page 36 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.
Therm JVi Page 31 Page 37 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.
LAARS Heating Systems Page 38 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
Mini-Therm JVS Page 39 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 4 3 1 Figure 19B. JVS Parts Identification.
H2355800B LAARS Heating Systems 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.