UNIT TROUBLESHOOTING (cont)

PROBLEM

POSSIBLE CAUSE

CORRECTIVE ACTION

 

OAC not enabled

Enable OAC.

 

Fan status is OFF

Verify fan is operating and supply fan status is correct. Sup-

 

ply fan status must be ON to allow OAC control.

 

 

 

According to occupancy schedule, building

Verify that current time and date are correct and recon®gure

 

is unoccupied

occupancy schedule.

 

Incorrect unit type

Change unit type to VAV (1). OAC not available for CV

 

units.

 

 

Constant outside air

 

Verify 24 vac power at sensor input and correct voltage at

Outside-air velocity pressure (OAVP) sensor

sensor output. Verify that pneumatic tube from sensor to

(OAC) malfunctioning

probe is unblocked and correctly connected to the probe.

 

not functioning

 

Verify that high-pressure side of probe faces the air¯ow.

 

 

 

 

Correct problems as necessary.

 

OAVP sensor not con®gured

Con®gure OAVP sensor for correct voltage and pressure

 

output ranges.

 

 

 

 

Verify above corrective action; adjust the probe multiplica-

 

OAVP value does not match that of measure-

tion factor (PMF) so that the OAVP reading matches that

 

ment equipment

of the measurement device. (OAVP value = sensor

 

 

value/PMF).

 

IAQ not enabled

Enable IAQ.

 

According to occupancy schedule, building is

Verify that current time and date are correct and recon®gure

 

unoccupied

occupancy schedule.

 

 

Verify that priority level is set at 1 or 2 and correct if

 

IAQ priority level is incorrect

necessary. (Level 3 provides no IAQ control, only alarm

 

 

functions.)

 

Set point too high

Adjust set point to correct (lower) level.

 

 

Ensure that power and control wiring are correct. Verify

 

Air quality (AQ) sensors not operating

24 vac power at sensor input and correct voltage at sensor

 

 

output.

 

AQ sensors not con®gured

Ensure that sensor voltage range and output values are

 

correctly con®gured.

 

 

Indoor-air quality

 

Set IAQ type to 1 for a single sensor or two sensors used

IAQ type set incorrectly

for differential comparison. Set IAQ type to 2 for two sen-

(IAQ) features

 

sors used for separate readings.

malfunctioning

 

 

IAQ functions suspended because priority level is

Ð

 

2 and the conditions below apply:

 

 

 

Space temperature is too high or too low

Control will resume when space temperature recovers.

 

Space relative humidity is greater than cooling

Ensure that CCHHL is set correctly. Control will resume

 

coil high humidity limit (CCHHL)

when the relative humidity drops below CCHHL.

 

For VAV units only; supply-air temperature

Control will resume when SAT control recovers. This is nor-

 

(SAT) is greater than the sum of cooling coil

 

mal operation during conditions of high or low outside-air

 

master reference (CCMR) plus 5 F, or SAT is

 

temperature (OAT)

 

less than (CCMR−8 F) for 4 minutes or more

 

 

 

Mixed-air temperature (MAT) sensor is forced,

Normal operation will resume when the MAT sensor is oper-

 

ating correctly or when OAT is greater than 45 F. If OAT is

 

open, or shorted; OAT is less than 45 F;

 

greater than 45 F, remove force from, repair, or replace the

 

MAT protection is enabled

 

MAT sensor.

 

 

115

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Image 115
Carrier 39L specifications OAC malfunctioning, IAQ features, Malfunctioning
Page 114 Page 116

39L specifications

The Carrier 39L is a cutting-edge air conditioning unit designed for both residential and commercial applications, providing exceptional cooling and heating performance. Equipped with advanced technologies, this system ensures optimal climate control while maintaining energy efficiency.

One of the standout features of the Carrier 39L is its inverter technology. This innovation allows the system to adjust its compressor speed based on the ambient temperature, which results in a significant reduction in energy consumption. By operating at varying capacities rather than a fixed output, the 39L can maintain a consistent temperature, enhancing comfort while lowering electricity bills.

The Carrier 39L also includes a high-efficiency air filtration system, designed to capture dust, allergens, and other airborne particles. This not only improves indoor air quality but also promotes a healthier living environment. The filtration system is complemented by anti-bacterial treatment, ensuring that the air circulated within your space is both clean and refreshing.

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Durability is also a key characteristic of the Carrier 39L. Constructed with high-quality materials and coated with corrosion-resistant treatments, the unit is built to withstand various environmental conditions. This ensures long-lasting performance and reduces the need for frequent maintenance.

Overall, the Carrier 39L is a versatile, efficient, and user-friendly air conditioning solution. Its blend of advanced technologies, energy-saving capabilities, and robust design makes it an ideal choice for those seeking reliable climate control in their spaces. Whether for residential comfort or commercial necessity, the Carrier 39L stands out as a leader in modern air conditioning.
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