Carrier 40QAC Troubleshooting, Before Calling for Service, Problem Cause Typical Solution

Page 23

Before Calling for Service

Save the cost of a service call by doing the following:

1.Be sure main power to system is turned on.

2.Press Mode button until OFF is displayed. Wait 5 minutes.

3.Press Mode button until either COOL or HEAT is displayed (as desired).

4.Adjust thermostat set point to desired room temperature. If system starts within a few minutes, service may not be ne- cessary. If system does not operate properly, check Table 14 for typical solutions.

IF SYSTEM FAILS TO OPERATE — Be sure:

Sunit ON/OFF switch is in ON position S fuse or circuit breaker is not tripped

FRESH AIR INSTALLATION OPTION

The units have an installation option, which allows for field installation of fresh air ventilation. Plan the installation carefully. Before beginning, measure carefully and follow acceptable building practices, NEC, and local codes.

Ventilation-Air Accessory — Refer to ventilation air accessory installation instructions.

TROUBLESHOOTING

If the under-ceiling fan coil unit fails to start or operate properly, sometimes the problem is minor and can be handled without a service call. Refer to Table 14 for some common problems, causes, and typical solutions. See Fig. 36 and 37 for additional system troubleshooting details. If the problem cannot be corrected, contact a local dealer for further assistance.

Table 14 – Troubleshooting

PROBLEM

CAUSE

TYPICAL SOLUTION

 

 

 

 

Blown fuse or circuit breaker tripped at building power

Replace fuse or reset circuit breaker.*

 

entry.

 

 

 

 

 

 

Indoor and/or outdoor unit disconnect switch is off.

Turn on disconnect switch(es).

 

 

 

 

Thermostat is set to night mode.

Cancel mode using Day/Night button on thermostat.

 

 

 

System Does Not Start.

Power failure.

Restore power.

 

 

Unit is in off mode.

Press Mode button on thermostat until thermostat dis-

 

 

plays the desired unit mode.

 

 

 

 

 

 

Three---minute time delay is running.

Wait for 3 minutes.

 

 

 

 

Temperature is above or below the selected temperat-

Select new temperature using the thermostat.

 

ure.

 

 

 

 

 

 

Air filter(s) in indoor unit is dirty or needs to be replaced.

Clean or replace air filter(s).

 

 

 

 

Temperature is set too high or too low.

Reset temperature to desired comfort setting using the

 

thermostat.

System Does Not Cool Properly.

 

 

 

Outdoor unit outdoor coil restricted.

Remove obstruction.

 

 

 

 

 

Fan speed is set too low.

Adjust fan speed to high or auto. using the Fan button

 

on the thermostat.

 

 

 

 

 

 

Air filter(s) in indoor unit is dirty or needs to be replaced.

Clean or replace air filter(s).

 

 

 

 

Temperature is set too high or too low.

Reset temperature to desired comfort setting using the

 

thermostat.

 

 

 

 

 

System Does not Heat Properly.

Outdoor unit outdoor coil restricted.

Remove obstruction.

 

 

Fan speed is set too low.

Adjust fan speed to high or auto. using the Fan button

 

 

on the thermostat.

 

 

 

 

 

 

Outdoor unit outdoor coil is frosted up.

Check manual defrost timer setting and adjust as ne-

 

cessary.

 

 

 

 

 

Ice or frost has Formed on Indoor

Low outdoor ---air temperature.

Run system in fan ---only mode until frost is gone.

Coil.{

Air filter(s) in indoor unit is dirty or needs to be replaced.

Clean or replace air filter(s).

 

 

 

Insufficient Airflow.

Air filter(s) in indoor unit is dirty or needs to be replaced.

Clean or replace air filter(s).

 

 

Fan coil unit coil is blocked.

Clean air discharge louvers.

 

 

 

 

*If fuse blows or circuit breaker trips again after first start attempt, DO NOT attempt to start system again. Contact your local dealer for assistance.

When outdoor temperature is approximately 55_F (12.8_C) or below, indoor coil frosting may occur when system is operated in cooling or maximum dehumidification mode. Units are not intended to operate below 55_F (12.8_C) without appropriate accessories.

40QAC/38HDR -- 40QAQ/38QRR

23

Image 23
Contents 38HDR, QRR Unit Safety Considerations40QAC, QAQ Unit Size Dimensions IndoorUnit 38HDR Outdoor Unit Dimensions English 38HDR Outdoor Unit Dimensions SI 38QRR Outdoor Unit Dimensions English 38QRR Outdoor Unit Dimensions SI System Requirements Parts ListUser Interface Finished Goods Accessory Power and Connecting Cables Field SuppliedInstallation Fan Coil Unit Hanging Dimensions Mounting Unit on Wall Mounting on GroundMounting on Roof Connection at Outdoor Unit Complete Outdoor Power and Control WiringComplete Outdoor Refrigerant Piping Connec- tions Line Power Connections Power Wiring40QAC/QAQ Electrical Data 38HDR Electrical Data38QRR Electrical Data 38HDR and 40QAC Cooling System Wiring Diagram 38QRR and 40QAQ Heat Pump System Wiring Diagram Connect Condensate Drain Line Complete Indoor PipingInstall Thermostat Complete Control WiringComplete Power Connection To Indoor Unit Preliminary Checks Using Vacuum PumpSTART-UP Reassemble Indoor UnitManifold Deep Vacuum Method To Start the UnitOperating Sequence Cleaning and MaintenanceCleaning and Maintenance Schedule ServiceTo clean the outdoor coil To clean or replace drain panProblem Cause Typical Solution TroubleshootingBefore Calling for Service TroubleshootingTroubleshooting the Heating Cycle Troubleshooting the Cooling Cycle 2SI

40QAC specifications

The Carrier 40QAC is a standout product in the realm of commercial air conditioning systems. This air-cooled chiller is designed to meet a variety of cooling needs while ensuring energy efficiency and reliability. One of the most notable features of the 40QAC is its advanced scroll compressor technology, which is engineered to provide consistent performance with reduced noise levels. This makes it an ideal choice for applications where minimizing sound pollution is crucial, such as in urban settings or near sensitive environments.

In terms of energy efficiency, the 40QAC boasts impressive ratings, with a high coefficient of performance (COP) that helps to lower operational costs and reduce environmental impact. Its design integrates various energy-saving features, including variable speed fans and a robust control system that optimizes performance based on real-time demand. This adaptability allows the chiller to maintain comfort levels while consuming less energy than traditional models.

The 40QAC is equipped with a microprocessor-based control system that simplifies operation and enhances user experience. This intelligent control interface allows operators to monitor performance metrics, adjust settings, and troubleshoot any issues remotely, increasing overall system reliability. The system is also designed to be compatible with building management systems, which facilitates seamless integration into existing infrastructure.

Another prominent characteristic of the Carrier 40QAC is its robust construction. Built with high-quality materials, it offers excellent durability and longevity, even in challenging environmental conditions. The unit also incorporates features to streamline maintenance, such as accessible component layout and easy-to-remove panels, ensuring that downtime for servicing is minimized.

Safety is another critical aspect of the Carrier 40QAC’s design. It’s engineered with numerous safety protocols to protect against overheating, overpressure, and other potential hazards, guaranteeing both system integrity and peace of mind for operators.

Overall, the Carrier 40QAC is a versatile and efficient solution for commercial cooling needs. With its technological advancements, energy-saving features, and robust design, it stands out as a reliable choice for businesses looking to balance performance with sustainability. The 40QAC not only promises efficient cooling but does so while aligning with the growing demand for eco-friendly solutions in today's marketplace.