Johnson Controls GGLS*MP, TGLS*MP, TG8S*MP Adjustment of Manifold GAS Pressure & Input Rate

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356485-UIM-G-1211

ADJUSTMENT OF MANIFOLD GAS PRESSURE & INPUT RATE

Inlet and manifold gas pressure may be measured by connecting the “U” tube manometer to the gas valve with a piece of tubing. Follow the appropriate section in the instructions below. Refer to Figure 25 for a drawing of the locations of the pressure ports on the gas valve.

Turn gas off at the ball valve or gas cock on gas supply line before the gas valve. Find the pressure ports on the gas valve marked Out P and In P.

1.The manifold pressure must be taken at the port marked OUT P.

2.The gas line pressure must be taken at the port marked IN P.

3.Using a 3/32” (2.4 mm) Allen wrench, loosen the set screw by turn- ing it 1 turn counter clockwise. DO NOT REMOVE THE SET SCREW FROM THE PRESSURE PORT.

Read the inlet gas pressure

Connect the positive side of the manometer to the IN P Tap on the gas valve. Do not connect any tubing to the negative side of the manometer, as it will reference atmospheric pressure. Refer to Figure 26 for connec- tion details.

1.Turn gas and electrical supplies on and follow the operating instructions to place the unit back in operation.

Table 11: Inlet Gas Pressure Range

The cap for the pressure regulator must be removed to gain access to the adjustment screw. Loosening or tightening the cap does not adjust the flow of gas.

NOTICE

The regulated outlet pressures, both low and high, have been cali- brated at the factory. Additional pressure adjustment should not be necessary. If adjustment is necessary, set to the following specifica- tions. After adjustment, check for gas leakage.

1.Refer to Figure 25 for location of pressure regulator adjustment cap and adjustment screws on main gas valve.

2.Turn gas and electrical supplies on and follow the operating instructions to place the unit back in operation.

3.Adjust manifold pressure by adjusting gas valve regulator screw for the appropriate gas per the following:

Table 12: Nominal Manifold Pressure

NOMINAL MANIFOLD PRESSURE

Natural Gas

3.5" w.c. (0.87 kPa)

Propane (LP) Gas

10.0" w.c. (2.488 kPa)

 

INLET GAS PRESSURE RANGE

 

 

 

 

 

 

 

 

 

Natural Gas

 

Propane (LP)

Minimum*

4.5” W.C. (1.12 kPa)

8.0” W.C. (1.99 kPa)

Maximum

10.5” W.C. (2.61 kPa)

13.0” (3.24 kPa) W.C.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The inlet gas pressure operating range table specifies what the minimum and maximum gas line pressures must be for the furnace to operate safely. The gas line pressure MUST BE a minimum of:

•7” w.c. (1.74 kPA) for Natural Gas

•11” w.c. (2.74 kPA) for Propane (LP) Gas

in order to obtain the BTU input specified on the rating plate and/or the nominal manifold pressure specified in these instructions and on the rating plate.

OUTLET

PRESSURE

PORT

INLET

WRENCH BOSS INLET

PRESSURE PORT

FIGURE 25: Gas Valve

 

VENT PORT

 

OUTLET

OFF

 

ON

MAIN REGULATOR

ON/OFF SWITCH

ADJUSTMENT

 

(Shown in ON position)

 

2.Once the correct gas inlet pressure has been established, see Table 11, turn the gas valve to OFF and turn the electrical supply switch to OFF; then remove the flexible tubing from the gas valve pressure tap and tighten the pressure tap plug using the 3/32” (2.4 mm) allen wrench.

3.Turn the electrical and gas supplies back on, and with the burners in operation, check for gas leakage around the gas valve pressure port for leakage using an approved non-corrosive gas leak detec- tion fluid, or other non-flammable leak detection methods.

Read the manifold gas pressure

Connect the positive side of the manometer to the adapter previously installed in the OUT P Tap on the gas valve. Do not connect any tubing to the negative side of the manometer, as it will reference atmospheric pressure. Refer to Figure 26 for connection details.

If gas valve regulator is turned in (clockwise), manifold pressure is increased. If screw is turned out (counter clockwise), manifold pres- sure will decrease.

4.After the manifold pressure has been adjusted, re-calculate the furnace input to make sure you have not exceeded the specified input on the rating plate. Refer to “CALCULATING THE FURNACE INPUT (NATURAL GAS)”.

5.Once the correct BTU (kW) input has been established, turn the gas valve to OFF and turn the electrical supply switch to OFF; then remove the flexible tubing from the gas valve pressure tap and tighten the pressure tap plug using the 3/32” (2.4 mm) Allen wrench.

6.Turn the electrical and gas supplies back on, and with the burners in operation, check for gas leakage around the gas valve pressure port for leakage using an approved non-corrosive gas leak detec- tion fluid, or other non-flammable leak detection methods.

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Johnson Controls Unitary Products

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Contents List of Figures Section I SafetyList of Sections List of TablesSafety Requirements Specific Safety Rules and PrecautionsAnce to a 50 HZ Power Supply or a Voltage Above 130 Volts Combustion AIR Quality List of Contaminants Codes and StandardsFurnace Location and Clearances InspectionDirectly BELOW. Keep Clear of ALL OBSTRUC- Tions Section II Ductwork Floor Base and Ductwork Installation DownflowCoil Installation Ductwork General InformationCoil Flange Installation COIL/FURNACE Assembly MC/FC/PC Series CoilsFurnace Assembly MC & FC Series Coils Furnace Assembly PC Series CoilsBottom Return and Attic Installations Coil / Furnace Assembly HC Series CoilsDownflow Duct Connectors Attic InstallationSuspended Furnace / Crawl Space Installation Typical Suspended Furnace / Crawl Space InstallationSection III Filters Filter InstallationAttempt to install filters inside the furnace Btuh kWSection IV GAS Piping GAS SafetyGAS Piping Installation Side ReturnHigh Altitude GAS Orifice Conversion High Altitude Pressure Switch ConversionGAS Orifice Conversion for Propane LP Manifold Pressures in wcLOW Voltage Control Wiring Connections Section V Electrical PowerElectrical Power Connections Supply Voltage 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 Venting Into AN Existing Chimney Category 1 450 F. MAX. Vent TempVenting FAN-ASSISTED Combustion SystemVentilated Combustion Air Vent and Supply Outside Air Safety Check ProcedureAir Supply Openings and Ducts Free AreaSection Viii START-UP Adjustments NOx Screen Removal Lo-NOx Models OnlyIgnition System Sequence GAS Piping Leak CheckCalculating the Furnace Input Natural GAS Seconds For Revolution Cu FtRevolution Read the manifold gas pressure Adjustment of Manifold GAS Pressure & Input RateRead the inlet gas pressure Nominal Manifold PressureAdjustment of FAN Control Settings Adjustment of Temperature RiseManifold Pressure U Tube Connection Bottom Airflow Data Scfm 1086 971 843 521 060A10 Medium High 1249 1207 757 733 694 659 575 444 399707 684 641 604 495 397 282 High 1371 1323 1251 1098 1018 921 669 503Section IX Safety Controls Furnace Control Diagnostics Section X Replacement Parts List Diagnostic Fault Code Storage and RetrievalSection XI Wiring Diagram Wiring DiagramJohnson Controls Unitary Products York Drive Norman, OK

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

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