Johnson Controls GG8S*MP, TGLS*MP GAS Orifice Conversion for Propane LP, Manifold Pressures in wc

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An accessible manual shutoff valve must be installed upstream of the furnace gas controls and within 6 feet (1.8 m) of the furnace.

The furnace must be isolated from the gas supply piping system by closing its individual external manual shutoff valve during any pressure testing of the gas supply piping system at pressures equal to or less than 1/2 psig (3.5 kPa).

The gas valve body is a very thin casting that cannot take any external pressure. Never apply a pipe wrench to the body of the gas valve when installing piping. A wrench must be placed on the octa- gon hub located on the gas inlet side of the valve. Placing a wrench to the body of the gas valve will damage the valve causing improper operation and/or the valve to leak.

Gas piping may be connected from either side of the furnace using any of the gas pipe entry on both sides of the furnace. Refer to Figure 12.

Table 5: Nominal Manifold Pressure

Manifold Pressures (in wc)

 

 

 

Altitude (feet)

 

 

 

0-7999

8000-8999

9000-9999

 

 

 

 

 

 

800

3.5

3.5

3.5

 

 

 

 

 

ValueHeatingGas ft.)(BTU/cu

850

3.5

3.5

3.5

1100

3.2

2.7

2.4

 

900

3.5

3.5

3.5

 

 

 

 

 

 

950

3.5

3.5

3.3

 

 

 

 

 

 

1000

3.5

3.2

2.9

 

1050

3.5

2.9

2.7

 

 

 

 

 

 

 

 

 

 

 

2500 (LP)

9.8

8.2

7.5

GAS ORIFICE CONVERSION FOR PROPANE (LP)

This furnace is constructed at the factory for natural gas-fired operation, but may be converted to operate on propane (LP) gas by using a fac- tory-supplied LP conversion kit. Follow the instructions supplied with the LP kit.

LoNOx furnaces requiring propane (LP) gas must have the LoNOx screens removed prior to installation and operation. See propane instructions.

HIGH ALTITUDE GAS ORIFICE CONVERSION

This furnace is constructed at the factory for natural gas-fired operation at 0 –5,000 feet (0-m – 1,524 m) above sea level.

The manifold pressure must be changed in order to maintain proper and safe operation when the furnace is installed in a location where the altitude is greater than 5,000 feet (1,524 m) above sea level. Refer to Table 5 for proper manifold pressure settings.

HIGH ALTITUDE PRESSURE SWITCH CONVERSION

For installation where the altitude is less than 5,000 feet (1,524m), it is not required that the pressure switch be changed unless you are in an area subject to low pressure inversions.

Manifold Pressures (kpa)

 

 

 

 

Altitude (m)

 

 

 

 

0-2437

2438-2742

2743-3048

 

 

 

 

 

 

 

 

29.8

0.87

0.87

0.87

 

 

 

 

 

 

HeatingValue

 

31.7

0.87

0.87

0.87

(MJ/cum)

33.5

0.87

0.87

0.87

 

 

 

 

35.4

0.87

0.87

0.81

 

 

 

 

 

 

37.3

0.87

0.80

0.73

Gas

 

39.1

0.87

0.73

0.67

 

 

 

 

 

 

41.0

0.80

0.66

0.61

 

 

 

 

 

 

 

 

93.2 (LP)

2.44

2.03

1.86

DANGER

PROPANE AND HIGH ALTITUDE CONVERSION KITS

It is very important to choose the correct kit and/or gas orifices for the altitude and the type of gas for which the furnace is being installed.

Only use natural gas in furnaces designed for natural gas. Only use propane (LP) gas for furnaces that have been properly converted to use pro- pane (LP) gas. Do not use this furnace with butane gas.

Incorrect gas orifices or a furnace that has been improperly converted will create an extremely dangerous condition resulting in premature heat exchanger failure, excessive sooting, high levels of carbon monoxide, personal injury, property damage, a fire hazard and/or death.

High altitude and propane (LP) conversions are required in order for the appliance to satisfactory meet the application. An authorized distributor or dealer must make all gas conversions.

In Canada, a certified conversion station or other qualified agency, using factory specified and/or approved parts, must perform the conversion. The installer must take every precaution to insure that the furnace has been converted to the proper gas orifice size when the furnace is installed. Do not attempt to drill out any orifices to obtain the proper orifice size. Drilling out a gas orifice will cause misalignment of the burner flames, causing premature heat exchanger burnout, high levels of carbon monoxide, excessive sooting, a fire hazard, personal injury, property damage and/or death.

Johnson Controls Unitary Products

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Contents List of Tables Section I SafetyList of Sections List of FiguresAnce to a 50 HZ Power Supply or a Voltage Above 130 Volts Specific Safety Rules and PrecautionsSafety Requirements Codes and Standards Combustion AIR Quality List of ContaminantsDirectly BELOW. Keep Clear of ALL OBSTRUC- Tions InspectionFurnace Location and Clearances 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 ConnectionsSingle Stage PSC AIR Furnace Conditioner ID ModelsThermostat Single Stage Heat Pump Single Stage PSC FurnaceOD Models Section VI Twinning and Staging Vent Connections Section VII Vent SystemStaging 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 AdjustmentsCalculating the Furnace Input Natural GAS GAS Piping Leak CheckIgnition System Sequence Revolution Revolution Cu FtSeconds For Nominal Manifold Pressure Adjustment of Manifold GAS Pressure & Input RateRead the inlet gas pressure Read the manifold gas pressureManifold Pressure U Tube Connection Adjustment of Temperature RiseAdjustment of FAN Control Settings 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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