Boiler Manual - Weil-McLain

GV90+ gas-fired water boiler — Boiler ManualPrepare boiler locationInstallations must follow these codes:• Local, state, provincial, national codes, laws, regulations and ordinances.• National Fuel Gas Code, ANSI Z223.1- latest edition.• Standard for Controls and Safety Devices for Automatically Fired Boilers,ANSI/ASME CSD-1, when required.• National Electrical Code.• For Canada only: B149.1 or B149.2 Installation Code and CSA C22.1Canadian Electrical Code Part 1 and any local codes.The GV90+ boiler gas manifold and controls met safe lighting and otherperformance criteria when boiler underwent tests specified in ANSI Z21.13— latest edition.For the Commonwealth of Massachusetts, read and followthe special instructions located on page 34 of this manual.Install the boiler so control system components are protectedfrom dripping or spraying water or rain during operation.Allowing these components to become wet could cause aboiler failure, resulting in severe personal injury, death orsubstantial property damage.Figure 1Figure 2Estimated GV90+ input at altitudeAltitude(feet)% Sea level input1,000 972,000 933,000 904,000 875,000 835,500 826,000 807,000 778,000 749,000 7210,000 69Service clearances (recommended)High altitude installationsGV90+ boiler controls automatically reduce input with increasing altitude.See Figure 1 for estimated input at altitude as a percentage of sea levelinput. Multiply the boiler sea level input by this percentage to obtain theestimated high altitude input. Note that the length of the venting systemwill also have a minor impact on input. Refer to the vent supplement forfurther information.No modifications to the boiler should be necessary for installations up to5,500 feet above sea level. For higher elevations, the air pressure switchmust be changed to a special high altitude switch. Refer to the high altitudekit instructions, page 10. Note that the gas valve outlet pressure must bechecked (and adjusted if necessary) following instructions on page 62.DO NOT sidewall vent DIRECT EXHAUST APPLICATIONSat altitudes above 5,500 feet. Sidewall venting is only allowedfor DIRECT VENT applications (ducted combustion air) ataltitudes above 5,500 feet.Vent length also affects boiler input — the boiler automaticallyderates to compensate for pressure loss through the vent.See the derate values given in Figure 109, page 101. For highaltitude installations, multiply the % in Figure 1 times thevalue shown in Figure 109 to determine input vs sea level.Service clearancesWhen possible, install GV90+ boilers with clearances at least as large asshown in Figure 2 for best service access.FlooringThe GV90+ boiler is approved for installation on combustible flooring,but must never be installed on carpeting.Do not install boiler on carpeting even if foundation is used.Fire can result, causing severe personal injury, death or substantialproperty damage.6Part number 550-142-054/1211