Johnson Controls TM9X*MP installation manual GAS Piping Leak Check, Ignition System Sequence

Page 29

697936-UIM-B-01211

GAS PIPING LEAK CHECK

FIRE OR EXPLOSION HAZARD

Failure to follow the safety warnings exactly could result in serious injury, death or property damage.

Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections. A fire or explosion may result causing property damage, personal injury or loss of life.

Burner ignition may not be satisfactory on first startup due to residual air in the gas line or until gas manifold pressure is adjusted. The igni- tion control will make three attempts to light before locking out.

It is recommended that when the gas supply is first connected to the furnace, the ground union be loosened until the odor of gas is detected. When gas is detected, immediately tighten the union and check for gas leaks. Allow five minutes for any gas to dissipate before continuing with the startup procedure. Be sure that proper ventilation is available to dilute and carry away any vented gas.

With furnace in operation, check all of the pipe joints, gas valve connec- tions and manual valve connections for leakage using an approved gas detector, a non-corrosive leak detection fluid or other leak detection methods. Take appropriate action to stop any leak. If a leak persists, replace the faulty component.

The furnace and its equipment shutoff valve must be disconnected from the gas supply during any pressure testing of that system at test pres- sures in excess of 0.5 psig (3.45 kPa).

The furnace must be isolated from the gas supply piping system by closing the equipment shutoff valve during any pressure testing of the gas supply system.

IGNITION SYSTEM SEQUENCE

1.Turn the gas supply ON at external valve and main gas valve.

2.Set the thermostat above room temperature to call for heat.

3.System start-up will occur as follows:

a.The induced draft blower motor will start and come up to speed. Shortly after inducer start-up, the hot surface igniter will glow for about 17 seconds.

b.After this warm up, the ignition module will energize (open) the main gas valve.

c.After flame is established, the supply air blower will start in about 30 seconds.

HOT SURFACE IGNITION SYSTEM

Do not attempt to light this furnace by hand (with a match or any other means). There may be a potential shock hazard from the components of the hot surface ignition system. The furnace can only be lit auto- matically by its hot surface ignition system.

CALCULATING THE FURNACE INPUT (NAT. GAS)

Burner orifices are sized to provide proper input rate using natural gas

with a heating value of 1030 BTU/Ft3 (38.4 MJ/m3). If the heating value of your gas is significantly different, it may be necessary to replace the orifices.

NOTICE

DO NOT set manifold pressure less than 3.2” w.c. or more than 3.8” w.c. for natural gas at sea level. If manifold pressure is outside this range, change main burner orifices.

NOTICE

If orifice hole appears damaged or it is suspected to have been redrilled, check orifice hole with a numbered drill bit of correct size. Never redrill an orifice. A burr-free and squarely aligned orifice hole is essential for proper flame characteristics.

DO NOT bottom out gas valve regulator adjusting screw. This can result in unregulated manifold pressure and result in excess overfire and heat exchanger failures.

Verify natural gas input rate by clocking meter.

1.Turn off all other gas appliances and pilots.

2.Run furnace for a minimum of 3 minutes in heating operation.

3.Measure time (in sec) for gas meter to complete 1 revolution and note reading. The 2 cubic feet dial provides a more accurate mea- surement of gas flow.

4.Refer to Table 14 for cubic feet of gas per hour.

5.Multiply cubic feet per hour by heating valve (BTU/cu ft) to obtain input.

If clocked rate does not match the input rate from the unit nameplate. follow steps in next section to adjust the manifold pressure. Repeat steps 2 - 5 until correct input is achieved.

Be sure to relight any gas appliances that were turned off at the start of this input check.

Johnson Controls Unitary Products

29

Page 28 Page 30
Image 29
Page 28 Page 30
Contents List of Figures List of SectionsList of Tables Combustion AIR and Vent SystemSafety Requirements Section I SafetySpecific Safety Rules and Precautions Codes and Standards Combustion AIR Quality List of ContaminantsFurnace Location and Clearances InspectionSection II Ductwork Floor Base and Ductwork Installation DownflowDuctwork General Information Duct FlangesCOIL/FURNACE Assembly MC/FC/PC Series Coils Coil InstallationFurnace Assembly MC & FC Series Coils Coil Flange InstallationDownflow Duct Connectors Coil / Furnace Assembly HC Series CoilsBottom Return and Attic Installations Critical Coil ProjectionDownflow Application Horizontal ApplicationCabinet Dimensions Inches Filter InstallationSection III Filters Btuh kWGAS Piping Installation GAS SafetySection IV GAS Piping Side ReturnGAS Orifice Conversion for Propane LP High Altitude Pressure Switch ConversionHigh Altitude GAS Orifice Conversion Manifold Pressures in. w.cElectrical Power Connections Section V Electrical PowerLOW Voltage Control Wiring Connections Supply Voltage ConnectionsSingle Stage Air Conditioner Single Stage Furnace Single Stage Heat Pump Single Stage Furnace Electronic AIR Cleaner Connection Accessory ConnectionsHumidifier Connection TwinningCondensate Drain Termination Will cause the furnace Johnson Controls Downflow ConfigurationHorizontal Left ConfigurationHorizontal Right Inducer Rotated Section VII Combustion AIR and Vent System Combustion AIR and Vent SafetyCombustion AIR/VENT Pipe Sizing Model Input Pipe Size MaximumElbow a Dimension Combustion AIR and Vent Piping AssemblyCombustion AIR / Venting Fitting Equivalent LengthHome Layout Vent ClearancesVenting Multiple Units Vent SystemVent Applications and Termination Outdoor Combustion Air Downward VentingCombustion AIR Supply Ambient Combustion Air SupplyFree Area Combustion Air Source From OutdoorsDampers, Louvers and Grilles Canada Only Ventilated Combustion Air Termination Air Supply Openings and DuctsVentilated Combustion Air Vent Blower Rotation Section Viii START-UP AdjustmentsSpecially Engineered Installations Calculating the Furnace Input NAT. GAS GAS Piping Leak CheckIgnition System Sequence Revolution Revolution Cu FtSeconds For Read the manifold gas pressure Adjustment of Manifold GAS Pressure & Input RateRead the inlet gas pressure Adjustment of FAN Control Settings Adjustment of Temperature RiseBlower Door Safety Switch Section IX Safety ControlsRollout Switch Controls Control Circuit FuseSection X Normal Operation and Diagnostics Diagnostic Fault Code Storage and Retrieval Fabricated Parts Section XI Replacement Parts ListReplacement Part Contact Information Section XII Wiring Diagram Wiring FurnaceJohnson Controls Unitary Products York Drive Norman, OK

TM9X*MP specifications

The Johnson Controls TM9X*MP series represents a significant advancement in the realm of HVAC control systems, positioning itself as a versatile solution for both commercial and residential applications. Renowned for its intelligent design and user-friendly interface, the TM9X*MP series aims to enhance energy efficiency and provide comfort to its users.

One of the standout features of the TM9X*MP series is its advanced communication capabilities. It employs the latest communication protocols, including BACnet and Modbus, which facilitate seamless integration with various building management systems. This connectivity ensures that users can monitor and control their HVAC systems remotely, providing unparalleled convenience and control over their environment.

Further enhancing its adaptability, the TM9X*MP series supports a wide range of HVAC equipment, including heat pumps, rooftop units, and variable air volume systems. This flexibility makes it an ideal choice for diverse applications, catering to the specific needs of different building types and operational requirements.

Energy efficiency is a significant focus of the TM9X*MP series. The system is equipped with advanced algorithms that optimize HVAC performance based on real-time data inputs. By utilizing trends in occupancy and weather forecasts, the TM9X*MP can make informed adjustments to operation schedules and settings, ensuring minimal energy wastage while maintaining optimal comfort levels.

Another notable characteristic of the TM9X*MP series is its intuitive touchscreen interface. This user-centric design makes it easy for operators to navigate through various settings and configurations, reducing the complexity often associated with HVAC controls. The interface can display vital system information, including energy consumption metrics and system diagnostics, empowering users to make informed decisions regarding their HVAC systems.

The TM9X*MP series also prioritizes robustness and reliability. Built with high-quality components, these controllers are designed to withstand varying environmental conditions, ensuring extensive operational longevity. Furthermore, the comprehensive support and resources provided by Johnson Controls augment the TM9X*MP series’ reputation for exceptional service and performance.

In conclusion, the Johnson Controls TM9X*MP series is a versatile and reliable solution for modern HVAC control needs. Its advanced communication capabilities, energy-efficient algorithms, user-friendly interface, and robust design make it a strong contender in the market, catering to the dynamic demands of contemporary heating and cooling applications. Whether for large commercial buildings or smaller residential units, the TM9X*MP series stands out as a top-tier choice for HVAC management.
Top Page Image Contents