Johnson Controls TM9V*MP installation manual Adjustment of Manifold GAS Pressure & Input Rate

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701379-UIM-C-0712

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 39 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 40 for connec- tion details.

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

Table 16: Inlet Gas Pressure Range

 

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” w.c. (3.24 kPa)

The inlet gas pressure operating range table specifies what the mini- mum 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.

2.Once the correct gas inlet pressure has been established, see Table 16, 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 40 for connection details.

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

NOTICE

The regulated outlet pressure has been calibrated at the factory. Additional pressure adjustment should not be necessary. If adjust- ment is necessary, set to the following specifications. After adjust- ment, check for gas leakage.

This gas valve has separate regulator adjustment screws for high fire and low fire, as shown in Figure 39. The procedure below is used to adjust either the high fire manifold pressure or the low fire manifold pressure.

1.Refer to Figure 39 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 instruc- tions 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 17: Nominal Manifold Pressure

NOMINAL MANIFOLD PRESSURE

Natural Gas (High Fire)

3.5" w.c. (0.87 kPa)

Natural Gas (Low Fire)

1.6" w.c. (0.40 kPa)

Propane (LP) Gas (High Fire)

9.8" w.c. (2.488 kPa)

Propane (LP) Gas (Low Fire)

4.0" w.c. (0.99 kPa)

HIGH STAGE REGULATOR

ADJUSTMENT

 

OUTLET

 

PRESSURE

 

PORT

VENT

 

PORT

INLET

OUTLET

 

WRENCH

 

BOSS

 

INLET

 

PRESSURE

 

PORT

LOW STAGE REGULATOR

ON OFF

SWITCH

ADJUSTMENT

FIGURE 40: Gas Valve

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

4.After the manifold pressure has been adjusted, re-calculate the fur- nace 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.

MANIFOLD PRESSURE “U” TUBE CONNECTION

 

OUTLET

 

 

PRESSURE TAP

 

GAS VALVE

1/4” TUBING

 

 

 

 

FLAME

 

 

MAINIFOLD

 

 

PIPE

SENSOR

 

 

 

 

 

 

3.5 IN

 

 

 

WATER

 

 

 

COLUMN

GAS

 

 

GAS

 

U-TUBE

PRESSURE

BURNERS

 

 

MANOMETER

SHOWN

 

 

FIGURE 41: Reading Gas Pressure

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Johnson Controls Unitary Products

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Contents Models TM9V*MP List of SectionsList of Figures List of TablesSafety Requirements Section I SafetySpecific Safety Rules and Precautions Combustion AIR Quality List of Contaminants Codes and StandardsInspection Furnace Location and ClearancesFloor Base and Ductwork Installation Downflow Section II DuctworkDuctwork General Information Duct FlangesCoil Installation COIL/FURNACE Assembly MC/FC/PC Series CoilsFurnace Assembly MC & FC Series Coils Coil Flange InstallationDownflow Duct Connectors Coil / Furnace Assembly HC Series CoilsBottom Return and Attic Installations Critical Coil ProjectionHorizontal Application Downflow ApplicationFilter Installation Cabinet Dimensions InchesAttempt to install filters inside the furnace Section III FiltersGAS Safety GAS Piping InstallationSection IV GAS Piping Side ReturnHigh Altitude Pressure Switch Conversion GAS Orifice Conversion for Propane LPHigh Altitude GAS Orifice Conversion Manifold Pressures in. w.c Manifold Pressures kPaSection V Electrical Power Electrical Power ConnectionsLOW Voltage Control Wiring Connections Supply Voltage ConnectionsAC 9A TWO Stage Variable Speed Furnace OD Models AC 24C ID Models OD Models Accessory Connections Electronic AIR Cleaner ConnectionHumidifier Connection Single Stage ThermostatCondensate Drain Termination Typical. Combustion Pipe Drain TeeWill cause the furnace Airflow Horizontal Left Right Configuration Horizontal Right Inducer AS ReceivedCombustion AIR and Vent Safety Section VII Combustion AIR and Vent SystemCombustion AIR/VENT Pipe Sizing Model Input Pipe Size MaximumCombustion AIR and Vent Piping Assembly Combustion AIR / VentingElbow Fitting Equivalent LengthVent Clearances Home LayoutVenting Multiple Units Vent SystemVent Applications and Termination Downward Venting Outdoor Combustion AirCombustion AIR Supply Ambient Combustion Air SupplyCombustion Air Source From Outdoors Dampers, Louvers and Grilles Canada OnlyAir Supply Openings and Ducts Free AreaVentilated Combustion Air Ventilated Combustion Air TerminationSection Viii START-UP Adjustments Vent Blower RotationGAS Piping Leak Check Ignition System SequenceRevolution Seconds ForRevolution Cu Ft Adjustment of Manifold GAS Pressure & Input Rate Read the inlet gas pressureRead the manifold gas pressure Inlet GAS Pressure RangeAdjustment of Temperature Rise Adjustment of FAN Control SettingsHeating Indoor Fan Off Delay Variable Speed MotorsHigh / LOW Speed Cooling and Heat Pump CFM High / LOW Heat CFMSection IX Safety Controls Section X Normal Operation and DiagnosticsHeating Cycle TroubleshootingFurnace Control Diagnostics Diagnostic Fault Code Storage and Retrieval Description Section XI Replacement Parts ListReplacement Part Contact Information Wiring Diagram XII WiringDiagram York International Corp York Drive Norman, OK

TM9V*MP specifications

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