location and the tubing to the sampling tube be connected.

See “Completing Installation of Return Air Smoke

Sensor:” for details.)

Return Air Detector module (shipping position shown)*

Controller module

Return Air Detector Sampling Tube

*RA detector must be moved from shipping position to operating position by installer

C07307

Fig. 61 - Typical Return Air Detector Location

Return Air with Economizer —

The sampling tube is inserted through the side plates of the economizer housing, placing it across the return air opening on the unit basepan. See Fig. 62. The holes in the sampling tube face downward, into the return air stream. The sampling tube is connected via tubing to the return air sensor that is mounted on a bracket high on the partition between return filter and controller location. (This sensor is shipped in a flat-mounting location. Installation requires that this sensor be relocated to its operating location and the tubing to the sampling tube be connected. See the following installation procedure.)

Flexible

Exhaust Tube

Completing Installation of Return Air Smoke Sensor:

1.Unscrew the two screws holding the Return Air Sensor detector plate. See Fig. 63. Save the screws.

Controller

Screws

Flexible

Exhaust

Tubes

Sampling Tube

C10331

Fig. 63 - Return Air Detector Shipping Position

2.Remove the Return Air Sensor and its detector plate.

3.Rotate the detector plate so the sensor is facing out- wards and the sampling tube connection is on the bot- tom. See Fig. 64.

50HCQA

 

Sampling Tube

 

C10332

 

Fig. 64 - Return Air Sensor Operating Position

 

4. Screw the sensor and detector plate into its operating

 

position using screws from Step 1. Make sure the

 

sampling tube connection is on the bottom and the ex-

 

haust tube is on the top. See Fig. 64.

 

5. Connect the flexible tube on the sampling inlet to the

Return Air

sampling tube on the basepan.

 

Sampling Tube

Additional Application Data —

 

Refer to Catalog No. HKRNKA-1XA for discussions on

 

additional control features of these smoke detectors

C10330

including multiple unit coordination.

Fig. 62 - Return Air Sampling Tube Location

 

35

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Image 35
Carrier 50HCQA See Completing Installation of Return Air Smoke, Completing Installation of Return Air Smoke Sensor
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50HCQA specifications

The Carrier 50HCQA is a cutting-edge rooftop air conditioning unit designed for commercial applications, combining efficiency, reliability, and advanced technology to ensure optimal indoor climate control. This model stands out in Carrier's extensive range of HVAC solutions, showcasing a blend of innovative features suitable for diverse building types.

One of the key features of the Carrier 50HCQA is its high-efficiency compressor. With variable-speed capabilities, the compressor adjusts its output to meet the precise cooling or heating demands of the space, promoting energy savings and consistent temperature management. This flexibility results in reduced energy consumption, making the 50HCQA an environmentally friendly choice for businesses looking to lower their carbon footprint.

The 50HCQA integrates advanced microprocessor controls, streamlining operation and enhancing user interaction. This technology allows for sophisticated diagnostics, monitoring, and scheduling, giving facility managers the tools they need to optimize system performance. The user-friendly interface ensures that settings can be easily adjusted, and real-time performance metrics can be accessed to ensure efficient operation.

In terms of construction, the Carrier 50HCQA is built with durability in mind. The unit features a robust cabinet design with a galvanized steel construction that is resistant to corrosion. This feature enhances the longevity of the unit, making it suitable for a variety of weather conditions. Additionally, the insulated casing reduces sound levels, providing a quieter operation that is particularly beneficial in noise-sensitive environments.

Another significant characteristic of the 50HCQA is its environmentally responsible refrigerant options. It utilizes R-410A refrigerant, which has a lower Global Warming Potential (GWP) compared to traditional refrigerants. This aspect not only meets regulatory standards but also supports users in making eco-friendly choices in their HVAC systems.

The 50HCQA also supports a range of optional accessories, including economizers for enhanced energy efficiency and improved air quality. This allows for increased outdoor air intake during suitable conditions, which can significantly contribute to enhancing indoor air quality—an essential factor for occupant comfort and health.

In conclusion, the Carrier 50HCQA is an exemplary model in the commercial HVAC sector, delivering powerful performance, advanced control technologies, and robust construction. Its energy-efficient design, user-friendly controls, and eco-conscious refrigerant options make it a top choice for businesses aiming to invest in sustainable and reliable climate control solutions.
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