Johnson Controls YM8M/YMLM*MP Section Viii START-UP Adjustments, Ventilated Combustion Air

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368261-UIM-A-0508

2.One permanent openings, commencing within 12 in (30.5 mm)of the top of the enclosure shall be permitted where the equipment has clearances of at least 1 in (2.54 cm) from the sides and back and 6 in (15.24 cm) from the front of the appliance. The opening shall communicate directly with the outdoors and shall have a min- imum free area of:

a.1 square in per 3000 Btu per hour (6.45 cm3 per 0.879 kW) of the total input rating of all equipment located in the enclosure.

b.Not less than the sum of all vent connectors in the confined space.

3.The duct shall be least the same cross-sectional area as the free area of the air supply inlet opening to which it connects.

4.The blocking effects of louvers, grilles and screens must be given consideration in calculating free area. If the free area of a specific louver or a grille is not known. Refer to Table 7, "Estimated Free Area" to estimate free area.

Ventilated Combustion Air

The ventilated attic space or a crawl space from which the combustion air is taken must comply with the requirements specified in “AIR SOURCE FROM OUTDOORS” in this instruction or in Section 5.3, Air for Combustion and Ventilation of the National Fuel Gas Code, ANSI Z223.1 (latest edition). This type installation requires two properly sized pipes. One brings combustion air from a properly ventilated attic space or crawl space and a second pipe that extends from the furnace vent connection (top right of unit) to the exterior of the building.

Vent and Supply (Outside) Air Safety Check Procedure

For Category I furnaces, vent installations shall be in accordance with Parts 7 and 11 of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and or Section 7 and Appendix B of the CSA B149.1, Natural Gas and Propane Installation Codes, the local building codes, furnace and vent manufacture's instructions.

Multi-story or common venting systems are permitted and must be installed in accordance with the National Fuel Gas Code, ANSI Z223.1/ NFPA 54 and / or the CSA B149.1, Natural Gas and Propane Installa- tion Codes, local codes, and the manufacture's instructions.

Vent connectors serving Category I furnaces shall not be connected into any portion of mechanical draft systems operating under positive pressure.

Horizontal portions of the venting system shall be supported to prevent sagging using hangers or perforated straps and must slope upwards not less than 1/4" per foot (0.635 cm/m) from the furnace to the vent ter- minal.

It is recommended that you follow the venting safety procedure below. This procedure is designed to detect an inadequate ventilation system that can cause the appliances in the area to operate improperly causing unsafe levels of Carbon Monoxide or an unsafe condition to occur.

CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon- monxide poisoning or death.

The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:

1.Inspect the venting system for proper size and horizontal pitch. Determine that there is no blockage, restriction, leakage, corrosion or other deficiencies, which could cause an unsafe condition

2.Close all building doors and windows and all doors.

3.Turn on clothes dryers and TURN ON any exhaust fans, such as range hoods and bathroom exhausts, so they shall operate at maximum speed. Open the fireplace dampers. Do not operate a summer exhaust fan.

4.Follow the lighting instructions. Place the appliance being inspected in operation. Adjust thermostat so the appliance shall operate contin- uously.

5.Test each appliance (such as a water heater) equipped with a draft hood for spillage (down-draft or no draft) at the draft hood relief opening after 5 minutes of main burner operation. Appliances that do not have draft hoods need to be checked at the vent pipe as close to the appliance as possible. Use a combustion analyzer to check the CO2 and CO levels of each appliance. Use a draft gauge to check for a downdraft or inadequate draft condition.

6.After it has been determined that each appliance properly vents when tested as outlined above, return doors, windows, exhaust fans, fire- place dampers and any other gas burning appliance to their normal condition.

7.If improper venting is observed during any of the above tests, a problem exists with either the venting system or the appliance does not have enough combustion air (Supply Air from outside) to complete combustion. This condition must be corrected before the appliance can function safely.

NOTE: An unsafe condition exists when the CO reading exceeds 40 ppm and the draft reading is not in excess of - 0.1 in. W.C. (-25 kPa) with all of the appliance(s) operating at the same time.

8.Any corrections to the venting system and / or to the supply (outside) air system must be in accordance with the National Fuel Gas Code Z223.1 or CAN/CGA B149.1 Natural Gas and Propane Installation Code (latest editions). If the vent system must be resized, follow the appropriate tables in Appendix G of the above codes or for this appliance.

SECTION VIII: START-UP AND

ADJUSTMENTS

NOTE: In order that this furnace will operate properly, it is required that all of the startup procedures in this section be followed.

NOx SCREEN REMOVAL (Lo-NOx Models Only)

If the furnace is equipped with NOx screens and is to be used with LP (propane) gas, the screens must be removed prior to start-up.

1.Make sure that the electrical power to the unit is turned off and that the gas supply is turned off at the shut-off valve.

2.Remove the blower compartment and burner compartment access doors.

3.Disconnect the gas supply piping at the union to permit removal of the entire burner and gas control assembly from the vestibule panel. Use the wrench boss on the gas valve when removing or installing the piping.

4.Unplug the igniter from the wire harness. Disconnect the flame sensor wires located on top of the air shield. Unplug the gas valve from the wiring harness.

5.Remove the screws holding the burner assembly to the vestibule panel.

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Johnson Controls Unitary Products

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Contents Section I Safety ModelsList of Sections List of FiguresSpecific Safety Rules and Precautions Safety RequirementsAnce to a 50 HZ Power Supply or a Voltage Above 130 Volts Combustion AIR Quality List of ContaminantsCodes and Standards InspectionDuctwork General Information Section II DuctworkFurnace Location and Clearances Floor Base and Ductwork Installation Downflow COIL/FURNACE Assembly MC/FC/PC Series CoilsFurnace Assembly MC & FC Series Coils Coil Flange InstallationFurnace Assembly PC Series Coils Coil / Furnace Assembly HC Series CoilsDownflow Duct Connectors Critical Coil ProjectionBottom Return and Attic Installations Attic InstallationSuspended Furnace / Crawl Space Installation Horizontal ApplicationFilter Installation Attempt to install filters inside the furnaceSection III Filters Side ReturnGAS Safety GAS Piping InstallationSection IV GAS Piping GAS Conversion for Propane LPHigh Altitude Natural GAS Orifice Conversion Section V Electrical PowerElectrical Power Connections LOW Voltage Control Wiring Connections Supply Voltage ConnectionsAIR Conditioner Connections Zoning OperationThermostat ID ModelsModulating TWO Stage AIR Furnace Conditioner UIM-A-0508 Modulating Furnace OD Models Single Stage Heat PumpThermostat Modulating Furnace TWO Stage Heat PumpSection VI Twinning and Staging Section VII Vent SystemCombustion Air Source From Outdoors Dampers, Louvers and Grilles Canada OnlyAir Supply Openings and Ducts Free AreaSection Viii START-UP Adjustments Vent and Supply Outside Air Safety Check ProcedureVentilated Combustion Air NOx Screen Removal Lo-NOx Models OnlyCalculating the Furnace Input Natural GAS Setup Test ModeGAS Piping Leak Check Seconds For Revolution Cu FtAdjustment of Manifold GAS Pressure Adjustment of Temperature RiseSection IX Safety Controls Adjustment of FAN Control SettingsBlower Door Safety Switch Rollout Switch ControlsSection X Normal Operation and Diagnostics Furnace Control DiagnosticsPressure Controls Limit ControlsDiagnostic Fault Code Storage and Retrieval Section XI Replacement Parts List Fabricated PartsSection XII Wiring Diagram Johnson Controls Unitary Products York Drive Norman, OK

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