Continuous FAN Operation

50VL-- A

HIGH

STD DEHUM

LOW

COM

QC5

QC4

QC3

QCR

DCR

R13

R11

CDM/C

0L0

ALO

QC1

AL2

24VAC/R

3AMP

QIL

A15

RL4

JWZ

JW5

JW3

QCB

SDL

W2 Y

W3 W3 W2 W2 C

JW4

SSTZ-8

W3 W2

A09059

Fig. 11 - Interface Fan Board (IFB)

SINGLE SPEED COOLING WITH HIGHER ELECTRIC HEAT SPEED

This unit can also be configured to operate with single speed cooling and a higher speed for an accessory electric heater.

1.Using Fig. 11, move the two pin DEHUM jumper from the “STD” position to the “DEHUM” position.

2.See Table 2 for minimum airflow for electric heat operation. Add electric heater and filter pressure drop to duct system static pressure to determine total external static pressure.

3.Select speed tap from Table 4 that will achieve required airflow from Table 2.

4.Remove the vinyl cap off of the desired speed tap wire (Refer to Table 3 for color coding).

5.Connect the desired speed tap wire to the “HIGH” terminal on the interface fan board (IFB).

!CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in unit component damage or improper operation.

To use this mode, a speed connection must be made on the “HIGH” terminal that meets or exceeds the minimum airflow found in Table 2.

Table 3 – Color Coding for Indoor Fan Motor Leads

Black = High Speed

Orange = Med--High Speed

Red = Med Speed

Pink = Med--Low Speed

Blue = Low Speed

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Disconnect electrical power to the unit and install lockout tag before changing blower speed.

When the DEHUM feature is not used, the continuous fan speed will be the same as cooling fan speed. When the DEHUM feature is used, the continuous fan will operate on IFB “LOW” speed when the DH control lead is not energized, or IFB “HIGH” speed when the DH lead is energized (see Fig. 11).

COOLING SEQUENCE OF OPERATION

With the room thermostat SYSTEM switch in the COOL position and the FAN switch in the AUTO position, the cooling sequence of operation is as follows:

When the room temperature rises to a point that is slightly above the cooling control setting of the thermostat, the thermostat completes the circuit between thermostat terminal R to terminals Y and G. These completed circuits through the thermostat connect contactor coil (C) (through unit wire Y) and time delay relay (TDR) (through unit wire G) across the 24-V secondary of transformer (TRAN).

The normally open contacts of energized contactor (C) close and complete the circuit through compressor motor (COMP) to condenser (outdoor) fan motor (OFM). Both motors start instantly.

A set of normally open contacts on the interface fan board (IFB) are closed which energizes a circuit to the indoor fan motor (IFB).

NOTE: Once the compressor has started and then has stopped, it should not be started again until 5 minutes have elapsed.

The cooling cycle remains on until the room temperature drops to a point that is slightly below the cooling control setting of the room thermostat. At this point, the thermostat breaks the circuit between thermostat terminal R to terminals Y and G. These open circuits deenergize contactor coil C and IFB. The condenser and compressor motors stop. After a 90-second delay, the blower motor stops. The unit is in a standby condition, waiting for the next call for cooling from the room thermostat.

50VL---A specifications

The Carrier 50VL---A is a powerhouse in the field of air conditioning and heating solutions, designed for residential and commercial applications. This unit exemplifies Carrier’s commitment to efficiency, reliability, and advanced technology. One of the standout features of the 50VL---A is its superior energy efficiency, which is reflected in its high Seasonal Energy Efficiency Ratio (SEER) and Heating Seasonal Performance Factor (HSPF) ratings. These ratings ensure reduced energy consumption and lower utility bills, making it an environmentally friendly choice.

The 50VL---A is designed with a robust scroll compressor that not only enhances performance but also minimizes noise levels during operation. This compressor is integral to the system’s ability to maintain a consistent temperature and humidity level within the space. The unit’s sound-dampening features contribute to a quieter environment, which is particularly important in residential settings.

One of the key technologies integrated into the Carrier 50VL---A is the advanced microprocessor control system. This technology allows for precise temperature adjustments and operational diagnostics, making maintenance easier and more efficient. This system ensures that the unit operates at optimal performance, adapting to changing environmental conditions with ease.

Moreover, the 50VL---A is equipped with a multi-speed blower motor that provides enhanced airflow and comfort. This feature allows users to select different cooling or heating levels according to their specific requirements, promoting customized comfort throughout the home or office.

In addition to its performance capabilities, the Carrier 50VL---A is also built with longevity and durability in mind. The cabinet is constructed from high-quality materials that offer resistance to corrosion and wear, ensuring the unit can withstand various weather conditions over time. Furthermore, the unit’s maintenance-friendly design allows for easy access to key components, simplifying servicing and prolonging the life of the system.

Overall, the Carrier 50VL---A stands out as a reliable and advanced solution for climate control. With its energy-efficient operation, quiet performance, and user-friendly features, it represents a significant investment in home comfort and efficiency. Whether for heating during the colder months or cooling in the summer, the 50VL---A delivers exceptional performance, making it a popular choice among users seeking quality HVAC solutions.

Carrier 50VL---A Single Speed Cooling with Higher Electric Heat Speed, Continuous FAN Operation

Models: 50VL---A