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.

24

Johnson Controls Unitary Products

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

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.

One of the main features of the TM8M/TMLM*MP series is its user-friendly interface that incorporates a large, easy-to-read display. This allows for quick adjustments and monitoring of temperature settings, making it accessible for both skilled technicians and everyday users. The intuitive design ensures that users can efficiently navigate through various settings and configurations.

Another notable characteristic is the flexibility of these controllers. The series supports multiple sensor configurations, enabling the integration of both wired and wireless sensors. This adaptability allows users to customize their climate control systems according to specific needs and room layouts, ultimately enhancing comfort and energy efficiency.

The TM8M/TMLM*MP and its counterparts are equipped with sophisticated algorithms that optimize energy consumption. By utilizing predictive maintenance and intelligent analytics, these controllers can adjust settings dynamically based on real-time data. This not only helps in reducing operational costs but also prolongs the lifespan of HVAC equipment.

Incorporating advanced communication protocols is a hallmark of the Johnson Controls series. The TM8M and CM8M models support modern systems such as BACnet and Modbus, allowing seamless integration with building management systems (BMS). This compatibility ensures that users can maintain centralized control over multiple systems, enhancing overall operational efficiency.

Additionally, the series is robustly constructed to withstand harsh environmental conditions. Its durable casing and reliable components ensure long-term performance, making it suitable for a variety of settings, including industrial facilities and commercial properties.

Safety features are also integral to the design of the TM8M/TMLM*MP and related models. Built-in safeguards protect against over-temperature and other potential hazards, ensuring reliability and peace of mind for operators.

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.