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Installation, Operation and Maintenance Instructions
Installation,
Operation and
Maintenance
Instructions for
Horizon
Oil Fired Boiler
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in boiler installation and maintenance. Improper installation and/or operation could create
carbon monoxide gas in flue gases which could cause serious injury, property damage, or death.
Improper installation and/or operation will void the warranty.
If the information in this manual is not followed exactly, a fire or explosion may result
causing property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
Installation and service must be performed by a qualified installer, service agency, or fuel oil
supplier.
WARNING
A subsidiary of BRADFORD WHITE Corporation
Document 1104B
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Summary of Contents for Laars Horizon
- Page 1 Installation, Operation and Maintenance Instructions for Horizon Oil Fired Boiler FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in boiler installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death.
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Page 2: General Information
LAARS Heating Systems Company Page 2 TABLE OF CONTENTS SECTION 1. Operation (using Honeywell L.8124A aquastat relay) ..4 General Information Domestic Water Piping ......... 4 Freight Claims ..........3 General Information ........3 SECTION 2. Boiler Installation .......... 3 Maintenance Boiler Location .......... - Page 3 Horizon Page 3 SECTION 1. 1D. Boiler Location The boiler should be positioned as near to the General Information chimney as possible and have a minimum smoke-pipe connector length of 18". 1A. Freight Claims Inspection should be made of boiler and 1E.
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Page 4: Electrical Connections
LAARS Heating Systems Company Page 4 Connect gate or shutoff valve (13) to tempering 1L. Oil valve (12) “MIX” port, and cold water inlet. Use only No. 2 Heating Oil. Do not use gasoline, Connect pressure relief valve (11) (if required by crankcase draining or any oil containing gasoline. -
Page 5: Maintenance Of The Tankless Coil
Horizon Page 5 2D. Maintenance of the Tankless Coil 2E. Coil Removal After several years of use, the water flow Switch off electrical supply and turn off water through the coil may become restricted by mineral to boiler. deposits from the water. Mild accumulations may be Drain the complete system. - Page 6 LAARS Heating Systems Company Page 6 SIDE PANEL TO FRONT PANEL FIXING 1. FIT FRONT PANEL (1) 2. ATTACH SIDE PANELS (2) AND (3) TO BOTTOM OF BOILER AND FRONT PANEL 3. FIX REAR PANELS (4) AND (5) TO SIDE PANELS 4.
- Page 7 Horizon Page 7 Supply Pipe Draft Regulator and Smoke Pipe Vent (not supplied) Relief Valve Tridicator ½" N.P.T. Aquastat Relay L8124A ¾" N.P.T. Wiring Conduit to Circulator Tankless Domestic Hot Water Coil ½" N.P.T. Wiring Conduit to Burner Flame Observation...
- Page 8 LAARS Heating Systems Company Page 8 3½" 8¾" Relief Valve — ¾" N.P.T. Domestic Hot Out Supply — J N.P.T. Tankless Coil Domestic ½" N.P.T. Cold In Aquastat Well ¾" N.P.T. Fire Sight Glass 7" 8" Return — J N.P.T.
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Page 9: Pipe Lengths
Horizon Page 9 Air Vent 1¼" min Fill Pipe Valve Oil Tank "P" Burner Boiler Filter "H" Figure 5. One-Pipe System. Air Vent 1¼" min. Burner Fill Pipe Filter Boiler Valve "H" Oil Tank Figure 6. Two-Pipe System. PIPE LENGTHS... - Page 10 LAARS Heating Systems Company Page 10 Power supply provides disconnect means & overload protection as required. Room Thermostat L1 (Hot) Power Supply 120V Circulator Switch Low Limit Circulator Hi Limit Oil Burner Relay Heating Circulator Aquastat Relay L8124A Wiring Arrangement for HC Boiler Controlling Operation of Boiler and Circulator Figure 7.
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Page 11: Part Numbers
Horizon Page 11 SECTION 3. Part Numbers Part Number Description Size Part Number Description Size 57-002 Boiler Body ....... 100/125 59-170 Front Panel Assembly 145/175 57-072 Inspection Cover Assembly ..100/125 59-164 Left Panel Assembly ....145/175 57-090 Burner Door Assembly .... 100/125 59-154 Right Panel Assembly ..... - Page 12 800.900.9276 • 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 • 905.238.0100 • Fax 905.366.0130 www.Laars.com Litho in U.S.A. © Laars Heating Systems 0805 Document 1104B...
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