Johnson Controls YM8M/YMLM*MP Section IX Safety Controls, Adjustment of FAN Control Settings

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368261-UIM-A-0508

ADJUSTMENT OF FAN CONTROL SETTINGS

Cooling - The airflow delivered by the furnace during cooling operation can be adjusted to match the cooling capacity of the A/C condensing unit. This is done by moving the COOL jumper on the control board to give the desired airflow.

Do not move the motor wires to different positions on the furnace control board!

The jumper has four positions, which will deliver sufficient airflow in cooling mode for the cooling capacities shown in the table below. The CFM delivery on each jumper position is shown in Table 13.

TABLE 13: Cooling Airflow - A/C Capacity in Tons

Models

 

Jumper Position

 

 

 

 

 

 

A

B

C

D

60/1200

3

2-1/2

2

1-1/2

80/1200

3

2-1/2

2

1-1/2

80/1600

4

3-1/2

3

2-1/2

100/1600

4

3-1/2

3

2-1/2

100/2000

5

4

3-1/2

3

120/2000

5

4

3-1/2

3

Continuous Fan Operation - The airflow delivered by the furnace dur- ing continuous fan operation can be adjusted as desired. This is done my moving the FAN jumper on the control board to give the desired air- flow.

Do not move the motor wires to different positions on the furnace control board!

The jumper has three positions. The "A" position delivers maximum air- flow, 100% of the blower capacity. Position "B" delivers approximately 70% of the blower capacity. And Position "C" delivers minimum airflow, approximately 40% of the blower capacity.

HUMIDIFIER

EAC

ZONING

TERMINALS

TERMINALS

JUMPER

BLACK

BLOWER

 

BLUE

BLOWER

YELLOW

BLOWER

RED

BLOWER

120VAC 120VAC

XFORMER

NEUTRAL NEUTRAL

XFORMER GROUND WHITE

BLOWER

 

 

 

HUMIDIFIER

 

24VAC

MODULATE COIL

GAS VALVE

 

 

 

 

 

 

 

PRIMARY

AUX

 

 

 

TEMP

 

 

LIMIT

LIMIT

 

AIR SW

 

SENSOR

 

 

 

 

ROD

VOLTAGE FLAME

 

 

 

 

 

 

 

 

 

 

 

NEUTRAL INDUCER

NEUTRALHOT

IGNITER

NEUTRALHOT

FLAME EACEAC

NEUTRALHOT

ZONE CONTROL

 

NO YES

EXT PRESSURE SENSOR

 

HOT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PLUG

 

PUMP

 

 

A-COIL TEMP SENSOR

 

 

COMPLO

COMPHI

ID

 

HEAT

YES NO

COOL

MLMH H

BUTTON

 

 

O DHUM Y1 Y/Y2 HUMIDISTATW

R

G

C

TEST

 

 

 

 

 

 

 

NO YES

FANCONTATR

L

 

 

 

 

 

 

 

 

 

 

LMH

 

 

 

 

 

 

 

 

 

 

+10F

 

 

 

 

 

 

 

 

 

 

NOM

 

 

 

 

 

 

 

 

 

 

10F-

 

 

 

 

 

 

 

 

 

 

BUTTON RERRO

HEAT PUMP JUMPER

COOLING

SPEED

JUMPER

CONTINUOUS FAN SPEED JUMPER

TEST

BUTTON

DIAGNOSTIC

LIGHT

FIGURE 30: Furnace Control Board

LOW

 

 

VOLTAGE

HUMIDISTAT

LAST ERROR

TERMINALS

JUMPER

BUTTON

SECTION IX: SAFETY CONTROLS

CONTROL CIRCUIT FUSE

A 3-amp fuse is provided on the control circuit board to protect the 24- volt transformer from overload caused by control circuit wiring errors. This is an ATO 3, automotive type fuse and is located on the control board.

BLOWER DOOR SAFETY SWITCH

This unit is equipped with an electrical interlock switch mounted in the burner compartment. This switch interrupts all power at the unit when the panel covering the blower compartment is removed.

Electrical supply to this unit is dependent upon the panel that covers the blower compartment being in place and properly positioned.

Main power to the unit must still be interrupted at the main power disconnect switch before any service or repair work is to be done to the unit. Do not rely upon the interlock switch as a main power dis- connect.

Blower and burner must never be operated without the blower panel in place.

ROLLOUT SWITCH CONTROLS

These controls are mounted on the burner assembly. If the temperature in the burner area exceeds its set point, the ignition control and the gas valve are de-energized. The operation of this control indicates a mal- function in the combustion air blower, heat exchanger or a blocked vent pipe connection. Corrective action is required. These are manual reset controls that must be reset before operation can continue.

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Johnson Controls Unitary Products

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Contents Section I Safety ModelsList of Sections List of FiguresSpecific Safety Rules and Precautions Safety RequirementsAnce to a 50 HZ Power Supply or a Voltage Above 130 Volts Combustion AIR Quality List of ContaminantsCodes and Standards InspectionSection II Ductwork Furnace Location and ClearancesDuctwork General Information Floor Base and Ductwork Installation Downflow COIL/FURNACE Assembly MC/FC/PC Series CoilsFurnace Assembly MC & FC Series Coils Coil Flange InstallationFurnace Assembly PC Series Coils Coil / Furnace Assembly HC Series CoilsDownflow Duct Connectors Critical Coil ProjectionBottom Return and Attic Installations Attic InstallationSuspended Furnace / Crawl Space Installation Horizontal ApplicationFilter Installation Attempt to install filters inside the furnaceSection III Filters Side ReturnGAS Safety GAS Piping InstallationSection IV GAS Piping GAS Conversion for Propane LPSection V Electrical Power Electrical Power ConnectionsHigh Altitude Natural GAS Orifice Conversion LOW Voltage Control Wiring Connections Supply Voltage ConnectionsAIR Conditioner 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 SystemCombustion Air Source From Outdoors Dampers, Louvers and Grilles Canada OnlyAir Supply Openings and Ducts Free AreaSection Viii START-UP Adjustments Vent and Supply Outside Air Safety Check ProcedureVentilated Combustion Air 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 RiseSection IX Safety Controls Adjustment of FAN Control SettingsBlower Door Safety Switch Rollout Switch ControlsSection X Normal Operation and Diagnostics Furnace Control DiagnosticsPressure Controls 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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