Johnson Controls GG8S*MP Section Viii START-UP Adjustments, NOx Screen Removal Lo-NOx Models Only

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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.

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

The initial start-up of the furnace requires the following additional procedures:

All electrical connections made in the field and in the factory should be checked for proper tightness.

When the gas supply is initially connected to the furnace, the gas piping may be full of air. In order to purge this air, it is recommended that the ground union be loosened until the odor of gas is detected. When gas is detected, immediately retighten the union and check for leaks. Allow five minutes for any gas to dissipate before continuing with the start-up procedure. Be sure proper ventilation is available to dilute and carry away any vented gas.

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.

6.Remove the burner assembly. It should be possible to swing the burner assembly out of the way without disconnecting the remain- ing wires.

7.With the burner assembly out of the way, simply slide the NOx screens out of the heat exchanger tubes and discard the screens.

8.Replace all components in reverse order. Reconnect all wiring.

Johnson Controls Unitary Products

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Contents List of Tables Section I SafetyList of Sections List of FiguresSafety Requirements Specific Safety Rules and PrecautionsAnce to a 50 HZ Power Supply or a Voltage Above 130 Volts Codes and Standards Combustion AIR Quality List of ContaminantsFurnace Location and Clearances InspectionDirectly BELOW. Keep Clear of ALL OBSTRUC- Tions Ductwork General Information Floor Base and Ductwork Installation DownflowCoil Installation Section II DuctworkFurnace Assembly PC Series Coils COIL/FURNACE Assembly MC/FC/PC Series CoilsFurnace Assembly MC & FC Series Coils Coil Flange InstallationAttic Installation Coil / Furnace Assembly HC Series CoilsDownflow Duct Connectors Bottom Return and Attic InstallationsTypical Suspended Furnace / Crawl Space Installation Suspended Furnace / Crawl Space InstallationBtuh kW Filter InstallationAttempt to install filters inside the furnace Section III FiltersSide Return GAS SafetyGAS Piping Installation Section IV GAS PipingManifold Pressures in wc High Altitude Pressure Switch ConversionGAS Orifice Conversion for Propane LP High Altitude GAS Orifice ConversionSupply Voltage Connections Section V Electrical PowerElectrical Power Connections LOW Voltage Control Wiring ConnectionsThermostat ID ModelsSingle Stage PSC AIR Furnace Conditioner OD Models Single Stage PSC FurnaceSingle Stage Heat Pump Section VI Twinning and Staging Staging Section VII Vent SystemVent Connections FAN-ASSISTED Combustion System Category 1 450 F. MAX. Vent TempVenting Venting Into AN Existing ChimneyFree Area Vent and Supply Outside Air Safety Check ProcedureAir Supply Openings and Ducts Ventilated Combustion AirNOx Screen Removal Lo-NOx Models Only Section Viii START-UP AdjustmentsIgnition System Sequence GAS Piping Leak CheckCalculating the Furnace Input Natural GAS Seconds For Revolution Cu FtRevolution Nominal Manifold Pressure Adjustment of Manifold GAS Pressure & Input RateRead the inlet gas pressure Read the manifold gas pressureAdjustment of FAN Control Settings Adjustment of Temperature RiseManifold Pressure U Tube Connection Bottom Airflow Data Scfm 1098 1018 921 669 503 757 733 694 659 575 444 399707 684 641 604 495 397 282 High 1371 1323 1251 1086 971 843 521 060A10 Medium High 1249 1207Section IX Safety Controls Furnace Control Diagnostics Diagnostic Fault Code Storage and Retrieval Section X Replacement Parts ListWiring Diagram Section XI Wiring DiagramJohnson Controls Unitary Products York Drive Norman, OK

TG8S*MP, GG8S*MP, TGLS*MP, GGLS*MP specifications

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