Johnson Controls LM8M/LMLM*MP Section VI Twinning and Staging, Section VII Vent System

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368261-UIM-A-0508

ACCESSORY CONNECTIONS

The furnace control will allow power-switching control of various acces- sories.

ELECTRONIC AIR CLEANER CONNECTION

Two 1/4” (0.64 cm) spade terminals (EAC and NEUTRAL) for electronic air cleaner connections are located on the control board. The terminals provide 115 VAC (1.0 amp maximum) during circulating blower opera- tion.

HUMIDIFIER CONNECTION

Two 1/4” (0.64 cm) spade terminals (HUM and NEUTRAL) for humidi- fier connections are located on the control board. The terminals provide 115 VAC (1.0 amp maximum) during heating system operation.

A mounting hole is provided on the control panel next to the furnace control board for mounting a humidifier transformer if required.

HUMIDISTAT CONNECTION

For better humidity control during cooling operation, an external humi- distat may be used. When using a external humidistat, put the HUMI- DISTAT jumper in the “YES” position. Connect the low voltage wiring as shown in Figures 20-25, Thermostat Charts.

SECTION VI: TWINNING AND STAGING

Twinning and staging is NOT allowed for modulating furnaces.

SECTION VII: VENT SYSTEM

VENT CONNECTIONS

Figure 26, "Combustion Air Inducer" shows the furnace as it is shipped from the factory. To convert to a horizontal or downflow position, remove the four screws that secure the inducer assembly and rotate 90° being careful not to damage the gasket. Reinstall screws. Remove cap from appropriate vent outlet location on the cabinet cut insulation in cabinet to same size as the hole provided and reinstall cap in the hole in the top panel.

In downflow applications, do not block the combustion air inlet. The furnace must be installed on a coil cabinet or subbase to allow com- bustionair to enter the burner compartment.

 

COMBUSTION AIR INDUCER

90°

Mounting Screw

90°

 

(Remove)

 

Pressure Switch

Flue Transition

Tube Routing

 

(Do Not Remove)

Pressure

 

Switch

 

 

 

 

Mounting Screw

 

 

(Remove)

FIGURE 26: Combustion Air Inducer

CATEGORY 1 - 450 F. MAX. VENT TEMP.

The venting system must be installed in accordance with Section 5.3, Air for Combustion and Ventilation, of the National Fuel Gas Code Z223.1/NFPA 54 (latest edition), or Sections 7.2, 7.3 or 7.4 of CSA B149.1, National Gas and Propane Codes (latest edition) or applicable provisions of the local building code and these instructions.

The furnace shall be connected to a type B vent connector, and shall be connected to a type B vent only. The furnace shall not be connected to a chimney flue serving a separate appliance designed to burn solid fuel. Single-wall vent pipe is not allowed.

It is recommended that the appliance is installed in a location where the space temperature is 32 °F (0°C) or higher. If the appliance is installed in a location where the ambient temperature is below 32 °F (0°C), the combustion byproducts could condense causing damage to the appli- ance heat exchanger.

This appliance may be common vented with another gas appliance for residential installations as allowed by the codes and standards listed in these instructions.

VENTING

Category I venting consists of vertically venting one or more appliances in B-vent or B-vent connectors. Type B-vent system extends in a gen- eral vertical direction and does not contain offsets exceeding 45°. A vent system having not more than one 60° offset is permitted.

VENTING INTO AN EXISTING CHIMNEY

This furnace may not be connected to any masonry chimney. However,

an existing masonry chimney may be used on as a chase through which the metal vent pipe passes.

FAN-ASSISTED COMBUSTION SYSTEM

This appliance is equipped with an integral mechanical means to draw products of combustion through the heat exchanger.

Ambient Combustion Air Supply

This type installation will draw the air required for combustion from within the space surrounding the appliance and from areas or rooms adjacent to the space surrounding the appliance. This may be from within the space in a non-confined location or it may be brought into the furnace area from outdoors through permanent openings or ducts. A single, properly sized pipe from the furnace vent connector to the out- doors must be provided. For upflow models combustion air is brought into the furnace through the unit top panel opening.

COMBUSTION

AIR

FIGURE 27: Combustion Airflow Path Through The Furnace Casing to the Burner Compartment

This type of installation requires that the supply air to the appli- ance(s) be of a sufficient amount to support all of the appliance(s) in the area. Operation of a mechanical exhaust, such as an exhaust fan, kitchen ventilation system, clothes dryer or fireplace may cre- ate conditions requiring special attention to avoid unsatisfactory operation of gas appliances. A venting problem or a lack of supply air will result in a hazardous condition, which can cause the appli- ance to soot and generate dangerous levels of CARBON MONOX- IDE, which can lead to serious injury, property damage and / or death.

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Johnson Controls Unitary Products

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Contents List of Sections Section I SafetyModels List of FiguresAnce to a 50 HZ Power Supply or a Voltage Above 130 Volts Specific Safety Rules and PrecautionsSafety Requirements Combustion AIR Quality List of ContaminantsCodes and Standards InspectionSection II Ductwork Furnace Location and ClearancesDuctwork General Information Furnace Assembly MC & FC Series Coils Floor Base and Ductwork Installation DownflowCOIL/FURNACE Assembly MC/FC/PC Series Coils Coil Flange InstallationDownflow Duct Connectors Furnace Assembly PC Series CoilsCoil / Furnace Assembly HC Series Coils Critical Coil ProjectionSuspended Furnace / Crawl Space Installation Bottom Return and Attic InstallationsAttic Installation Horizontal ApplicationSection III Filters Filter InstallationAttempt to install filters inside the furnace Side ReturnSection IV GAS Piping GAS SafetyGAS Piping Installation GAS Conversion for Propane LPSection V Electrical Power Electrical Power ConnectionsHigh Altitude Natural GAS Orifice Conversion AIR Conditioner Connections LOW Voltage Control Wiring ConnectionsSupply Voltage Connections Zoning OperationThermostat ID ModelsModulating TWO Stage AIR Furnace Conditioner UIM-A-0508 Modulating Furnace OD Models Single Stage Heat PumpThermostat Modulating Furnace TWO Stage Heat PumpSection VI Twinning and Staging Section VII Vent SystemAir Supply Openings and Ducts Combustion Air Source From OutdoorsDampers, Louvers and Grilles Canada Only Free AreaVentilated Combustion Air Section Viii START-UP AdjustmentsVent and Supply Outside Air Safety Check Procedure NOx Screen Removal Lo-NOx Models OnlySetup Test Mode GAS Piping Leak CheckCalculating the Furnace Input Natural GAS Seconds For Revolution Cu FtAdjustment of Manifold GAS Pressure Adjustment of Temperature RiseBlower Door Safety Switch Section IX Safety ControlsAdjustment of FAN Control Settings Rollout Switch ControlsPressure Controls Section X Normal Operation and DiagnosticsFurnace Control Diagnostics Limit ControlsDiagnostic Fault Code Storage and Retrieval Section XI Replacement Parts List Fabricated PartsSection XII Wiring Diagram Johnson Controls Unitary Products York Drive Norman, OK

LM8M/LMLM*MP, TM8M/TMLM*MP, CM8M/CMLM*MP, YM8M/YMLM*MP specifications

Johnson Controls TM8M/TMLM*MP, YM8M/YMLM*MP, LM8M/LMLM*MP, and CM8M/CMLM*MP are advanced temperature controllers designed for a wide range of applications in heating, ventilation, and air conditioning (HVAC) systems. These models stand out due to their robust features, cutting-edge technologies, and specific characteristics that cater to both residential and commercial environments.

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In summary, Johnson Controls TM8M/TMLM*MP, YM8M/YMLM*MP, LM8M/LMLM*MP, and CM8M/CMLM*MP controllers represent a convergence of user-friendly design, advanced technology, flexibility, and safety. Their ability to adapt to diverse applications while optimizing energy use makes them a critical component in modern HVAC systems, ensuring comfort and efficiency in every environment.