Laars Mini-Therm JVi JVH Installation And Operation Instructions Manual
Induced draft residential gas-fired hydronic boilers
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Summary of Contents for Laars Mini-Therm JVi JVH
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Page 2: Table Of Contents
LAARS Heating Systems Page 2 TABLE OF CONTENTS SECTION 1. SECTION 2. General Information Operating Procedures Introduction ........... 3 System Start-up .......... 13 Warranty ............3 Sequence of Operation ....... 15 Heater Identification ........3 SECTION 3. Flow Requirements ........3 Boiler Placement .......... -
Page 3: General Information
(this information can be found on the in this manual, or the Laars warranty will be voided. rating plate), installation date and name of the The installation must conform to the requirements of installer. -
Page 4: Boiler Placement
(51) (102) Failure to insure proper water flow through the (51) heat exchanger of the boiler will void the Laars warranty. Flow can be verified by measuring the difference in water temperatures between the boiler VIEW inlet (system return) and outlet (system supply). For example: For a JV-100 installation, the inlet water temperature is 160°F (71ºC), and the outlet temp-... -
Page 5: Combustion Air Supply
Mini-Therm JVi Page 5 are normally equipped to operate below a 2000' Distance Boiler Size From (610m) altitude. Boilers equipped to operate at higher altitudes have appropriate stickers or tags Meter in attached next to the rating plate. Feet (m) Inches 0-50' Use the figures in Table 5 to provide adequate... -
Page 6: Venting
LAARS Heating Systems Page 6 U.S. ANSI standard Z223.1 or in Canada, CAN/CGA- Exhaust Fans or Vents: Any equipment which B149.1 or .2, and any local codes that may be exhausts air from the boiler room can deplete the applicable. -
Page 7: Vertical Venting - Category I
Mini-Therm JVi Page 7 Do not weld the vent pipe to the boiler collar. minimum 12" (305mm) height above the boiler, is The weight of the stack must not rest on the boiler. recommended. The vent system should be sloped up The boiler top must be easily removable for normal toward the chimney 1/4"... -
Page 8: Horizontal Venting - Category Iii
LAARS Heating Systems Page 8 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 10 (3.0) -
Page 9: Common Venting System
Vent Termination 1H-3. Common Venting System The side wall vent terminal (hood), Laars Part Number D2004300 (4") or D2000401 (6"), must be When an existing boiler is removed from a used when the boiler is vented through a side wall. It... -
Page 10: Water Piping Of Boiler System
Place in operation the appliance being inspected. A properly sized expansion tank must be Follow the lighting instructions. Adjust included in the system. Laars offers an air-charged thermostat so appliance will operate diaphragm-type expansion tank, with an automatic continuously. - Page 11 Mini-Therm JVi Page 11 Multi-Zone Valve System Single Circuit System Primary Secondary Multi-Zone Multi-Zone Pump Pump System System Primary/Secondary Multi-Zone Valve System Primary/Secondary Multi-Zone Valve System Low Temperature Installation KEY: PUMP CHECK VALVE VALVE ZONE VALVE UNION AUTO AIR BLEEDER Figure 9.
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Page 12: Electrical Wiring
LAARS Heating Systems Page 12 Field installed safety devices and operating 1K. Electrical Wiring controllers, such as valve end switches, relays, timers, Follow these instructions to make the necessary and outdoor temperature reset devices, can be initial electrical connections. connected to the boiler through the wall thermostat Remove the two screws attaching the front cover circuit. -
Page 13: Operating Procedures
Mini-Therm JVi Page 13 Figure 10. Wiring Diagram, JVH. 2A. System Start-up 12. Close the water makeup valve and check the Verify that the pump system is operating strainer in the pressure reducing valve for properly: sediment or debris. Reopen the water makeup Shut off the manual gas valve located valve. -
Page 14: Zone Valves
LAARS Heating Systems Page 14 Wiring with Taco Zone Valves Wiring with Honeywell Zone Valves Wiring with Multiple Zone Pumps 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 zone is calling for heat. -
Page 15: Sequence Of Operation
Mini-Therm JVi Page 15 2B. Sequence of Operation Wall thermostat will call for heat. Pump relay will turn on the circulating pump. If water temperature is below the limit setting, the inducer motor relay will turn on the draft inducer. Pressure switch will sense the fan (inducer) operation and send 24 volts to the flame rollout switch. - Page 16 LAARS Heating Systems Page 16 FOR YOUR SAFETY, READ BEFORE OPERATING WARNING If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury, or loss of life. A. This boiler is equipped with an ignition device that •...
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Page 17: Maintenance
Mini-Therm JVi Page 17 SECTION 3. depends on their proper functioning. It is strongly recommended that the basic items listed below 3A. Maintenance be inspected by a qualified service technician Lubricate the water circulating pump per the every year. instructions on the pump. Water temperature controls. -
Page 18: Electrical Troubleshooting
LAARS Heating Systems Page 18 switch, check for defective hi-limit, open circuit 3B. Electrical Troubleshooting due to excessive water temperature, or a low Remove the control box cover on the front of the temperature setting. boiler. Place the second lead on the blue wire terminal Verify that 115 volts is reaching the boiler by on the fan proving switch. - Page 19 Mini-Therm JVi Page 19 Symptom Cause Remedy Pump not operating No power ..Check circuit breakers and power source. Pump defective ..Replace. Incorrectly wired ..Recheck wiring diagrams. Pilot outage Inlet gas pressure too low .
- Page 20 LAARS Heating Systems Page 20 Troubleshooting Honeywell SV9501/SV9601 Hot Surface Pilot System START • TURN GAS SUPPLY OFF CHECK: • SET THERMOSTAT TO • LINE VOLTAGE POWER CALL FOR HEAT • LOW VOLTAGE TRANSFORMER • LIMIT CONTROLLER SV9501/SV9601 IS • THERMOSTAT POWERED •...
- Page 21 Mini-Therm JVi Page 21 Glossary of Terms Air Vent A device used to purge air from the Circuit. Should be Primary-Secondary Piping located at the highest point in the Circuit. Two or more interconnecting circulating loops, each with its own pump. Primary =System Circuit; Branch Secondary=Boiler Circuit.
- Page 22 LAARS Heating Systems Page 22 Part Number Description Model, Size JVH-50 JVH-75 JVH-100 1. Pilot Gas System Pilot Assembly (Nat.), Hot Surface W2001800 W2001800 W2001800 Pilot Assembly (LP), Hot Surface W2001900 W2001900 W2001900 2. Burner with Pilot Bracket L0056500 L0056500 L0056500 3.
- Page 23 Mini-Therm JVi Page 23 Part Number Description Model, Size JVH-125 JVH-160 JVH-225 Pilot Gas System W2001800 W2001800 W2001800 Pilot Assembly (Nat.), Hot Surface W2001900 W2001900 W2001900 Pilot Assembly (LP), Hot Surface L0056500 L0056500 L0056500 2. Burner with Pilot Bracket L0052500 L0052500 L0052500 3.
- Page 24 *Items 13, 14, 15 and 30 are not shown Figure 14. Parts Identification. Laars Heating Systems Company reserves the right to change specifications, components, features, or to discontinue products without notice. 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 L4W 1W8 •...
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