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Laars INDIRECT-FIRED Installation And Operating Manual Download Page 36

800.900.9276 • Fax 800.559.1583 

(Customer Service, Service Advisors)

20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 

(Applications Engineering)

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 08

10

  Document 

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Summary of Contents for INDIRECT-FIRED

Page 1: ...ON OPERATING MANUAL WITH PARTS LISTING AND TROUBLESHOOTING GUIDE For your family s comfort safety and convenience we recommend this water heater be installed and serviced by a plumbing professional WA...

Page 2: ...water heater We require that you carefully read this manual as well as the enclosed warranty and refer to it if questions arise If you have any specific questions concerning your warranty please cons...

Page 3: ...er heater meets or exceeds the ASHRAE IES 90 1b standards with respect to insulation and standby loss requirements TABLE OF CONTENTS I IMPORTANT INFORMATION 4 II SPECIFICATIONS 8 III GENERAL INFORMATI...

Page 4: ...l regulations The following terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning product life DANGER Indica...

Page 5: ...um gas propane gas is heavier than air and will remain at floor level if there is a leak Basements crawl spaces closets and areas below ground level will serve as pockets for accumulation of leaking g...

Page 6: ...rvice or maintenance can cause property damage personal injury or loss of life Failure to follow all instructions in the proper order can cause personal injury or death Read and understand all instruc...

Page 7: ...er heater without first being certain it is filled with water Flammable items pressurized containers or any other potential fire hazardous articles must never be placed on or adjacent to the heater Co...

Page 8: ...22 41 1 8 34 3 8 41 7 8 5 3 8 27 1 2 50 Gal Res 26 36 29 3 4 36 3 4 5 3 8 27 1 2 50 Gal R Res 22 46 1 4 40 1 8 47 5 3 8 27 1 2 65 Gal Res 22 59 1 4 53 1 8 60 5 3 8 27 1 2 65 Gal Com 22 59 1 4 53 1 8...

Page 9: ...by Heat Loss Rating F Hr Minimum Heat Output Rate of the Heat Source BTU Hr Minimum Heat Source Flow Rate Gal Min 30 Gal Res 255 235 1 2 157 000 13 7 40 Gal Res 260 235 1 1 157 000 13 7 40 Gal R Res 2...

Page 10: ...al Res 321 470 4 2 6 7 220 000 80 Gal Com 546 834 8 0 12 8 420 000 120 Gal Res 357 507 4 2 6 7 220 000 120 Gal Com 583 871 8 0 12 8 420 000 NOTES Based on 200 F boiler water temperature and 50 F potab...

Page 11: ...the coil heat input of the water heater at 240 F boiler water supply temperature and 210 F potable water temperature is 94 100 Btu hr for residential models and 180 300 Btu hr for commercial models P...

Page 12: ...ed less than the normal minimum operating pressure of the potable water system The equipment is permanently labeled to indicate that only additives recognized as safe by the FDA shall be used in the h...

Page 13: ...temperature and pressure relief valve must be marked with a maximum set pressure not to exceed the maximum working pressure of the water heater The combination temperature and pressure relief valve mu...

Page 14: ...rer listed on the rating plate for anode replacement information WARNING Install a discharge line so that water discharged from the temperature and pressure relief valve will exit within six 6 inches...

Page 15: ...e indirect fired water heater will provide the rated performance only if used in conjunction with a heat source with a DOE heating capacity Boiler Output at least as much as the minimum noted in Table...

Page 16: ...ate at the combined pressure drop SYSTEM ZONE CONTROL The indirect fired water heater must be installed as a zone separate from the space heating system The domestic hot water zone s piping and circul...

Page 17: ...ed to satisfy domestic hot water demand is at least 50 of the boiler output required to satisfy space heating demand or c When an interruption in space heating can be tolerated during a long domestic...

Page 18: ...amage to the area adjacent to the water heater or to lower floors of the structure When such locations cannot be avoided a suitable drain pan must be installed under the water heater The drain pan dep...

Page 19: ...on Tank If the water heater is installed in a closed water supply system such as one having a back flow preventer in the cold water line provide thermal expansion control Contact the water supplier or...

Page 20: ...en sink before you use any electrical appliance that is connected to the hot water system If hydrogen is present there will be an unusual sound such as air escaping through the pipes as hot water begi...

Page 21: ...upply provisions must be made to control thermal expansion DO NOT operate this water heater in a closed system without provisions for controlling thermal expansion Warranties do not cover damages from...

Page 22: ...system Pipe and fittings between the boiler and indirect fired water heater should be diameter or larger CONNECT WATER BOILER SUPPLY PIPING 1 For a space heating system that utilizes ZONE VALVES refe...

Page 23: ...be piped to the boiler supply piping Mount the circulator making sure the flow arrow points toward the water heater The use of shut off valves and unions are recommended for future service convenienc...

Page 24: ...pical steam boiler without connections available below the water line is not recommended due to insufficient water temperature especially during warmer months when the space heating system is not oper...

Page 25: ...ontrol is factory set at 120 F and care should be made to not rotate this dial while wiring the control Once electrical connections are complete secure the aquastat cover back in place AT NO TIME SHOU...

Page 26: ...be taken to avoid unnecessary contact especially by children with the water heater UNDER NO CIRCUMSTANCES SHALL FLAMMABLE MATERIALS SUCH AS GASOLINE OR PAINT THINNER BE USED OR STORED IN THE VICINITY...

Page 27: ...in the tank The differential is variable 5 to 30 F with a 160 F maximum setting set at the factory to a 5 F differential and 120 F temperature WARNING SCALDING This water heater can deliver scalding...

Page 28: ...temperature dial through the hole directly below the temperature indication window The temperature setting is aligned with the notch in this window IT IS NOT NECESSARY TO REMOVE THE COVER TO ADJUST T...

Page 29: ...re service however may be subject to failure Failure to use the correct procedures or parts in these circumstances may make the water heater unsafe The owner should arrange to have the following inspe...

Page 30: ...h multiple sacrificial anodes Anodes protect the glass lined tank from corrosion by sacrificing themselves through electrolysis When the anode material is consumed there is no more protection and corr...

Page 31: ...ater fixture to allow air to escape Open the cold water supply to the heater and allow the tank to fill g Check your anode and drain valve for leaks h Turn the water heater electricity on for the zone...

Page 32: ...k fuse and replace Check circuit breaker and reset if applicable Electrical problem relay wiring etc Check power supply Scale build up If boiler circulator and tank are operating satisfactorily coil m...

Page 33: ...pacity High aquastat differential Adjust aquastat differential See Section VII Differential dial is under aquastat cover Replace aquastat Insufficient hot water Faulty tank aquastat Replace aquastat E...

Page 34: ...RT NAME DESCRIPTION 1 Aquastat Control 7 Drain Valve 2 Aquastat Well 8 Jacket Head Pan 3 Anode 9 Hole Closure 4 Diptube 10 Heat Exchanger Escutcheon 5 Outlet Nipple 11 Drain Escutcheon 6 T P Relief Va...

Page 35: ...ys ___________________ Nights Address _______________________________________________ Supplier _______________________________________________ Supplier Phone No ______________________________________...

Page 36: ...Advisors 20 Industrial Way Rochester NH 03867 603 335 6300 Fax 603 335 3355 Applications Engineering 1869 Sismet Road Mississauga Ontario Canada L4W 1W8 905 238 0100 Fax 905 366 0130 www Laars com Li...

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