HIGH-VOLTAGE POWER

LOW-VOLTAGE WIRING

WIRING ENTRY HOLE

ENTRY HOLE

A05198

Fig. 7—Unit Electrical Connection

C00011

Fig. 8—Control Box Wiring

START-UP

Use the Start-Up Checklist supplied at the end of this book and proceed as follows:

Step 1—Check for Refrigerant Leaks

LOCATE AND REPAIR REFRIGERANT LEAKS AND CHARGE THE UNIT AS FOLLOWS:

1.Using both high- and low-pressure ports, locate leaks and reclaim remaining refrigerant to relieve system pressure.

2.Repair leak following accepted practices.

Step 2—Start-Up Cooling Section and Make Adjustments

UNIT DAMAGE HAZARD

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

Complete the required procedures given in the Pre-Start- Up section this page before starting the unit. Do not jumper any safety devices when operating the unit.

Do not operate the compressor in cooling mode when the outdoor temperature is below 40 F.

Do not rapid-cycle the compressor. Allow 5 minutes between ‘‘on’’ cycles to prevent compressor damage.

CHECKING COOLING CONTROL OPERATION

Start and check the unit for proper cooling control operation as follows:

1.Place room thermostat SYSTEM switch in OFF position. Observe that blower motor starts when FAN switch is placed in ON position and shuts down within 60 seconds (for 024-042) or 90 seconds (for 048 and 060) when FAN switch is placed in AUTO position.

2.Place SYSTEM switch in COOL position and FAN switch in AUTO position. Set cooling control below room temperature. Observe that compressor, outdoor fan, and indoor blower motors start and that reversing valve shifts. Observe that cooling cycle shuts down when control setting is satisfied. Reversing valve (RV) remains energized.

3.Place system switch in HEAT position. Observe that compres- sor, indoor fan and outdoor fan energize (Reversing Valve is deenergized in heat pump heating mode). Set control above room temperature. Observe that heating cycle shuts down when control setting is satisfied.

4.When using an automatic changeover room thermostat, place both SYSTEM and FAN switches in AUTO. positions. Observe that unit operates in Cooling mode when temperature control is set to ‘‘call for cooling’’ (below room temperature), and unit operates in Heating mode when temperature control is set to “call for heating” (above room temperature).

Step 3—Refrigerant Charge

Refrigerant Charge — Amount of refrigerant charge is listed on unit nameplate and in Table 2. Refer to Carrier Refrigerant Service Techniques Manual, Refrigerants section. Unit panels must be in place when unit is operating during charging procedure. Unit must operate a minimum of 15 minutes before checking charge.

NO CHARGE

Refer to Carrier Refrigerant Service Techniques. Use standard evacuating techniques. After evacuating system, weigh in the specified amount of refrigerant (refer to Table 2).

 

 

 

UNIT GROUND

 

 

 

GROUND

 

 

 

LEAD

 

SINGLE-PHASE

L

BLK

3-PHASE

CONNECTIONS

 

 

CONNECTIONS

TO DISCONNECT

L

YEL

TO DISCONNECT

PER NEC

PER NEC

 

L

BLU

 

 

NOTE: Install a liquid-line filter drier whenever the system has been opened for repair.

Fig. 9—Line Power Connections

C00012

8

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Carrier 50ZHA024-060 Check for Refrigerant Leaks, Start-Up Cooling Section and Make Adjustments, Refrigerant Charge
Page 7 Page 9

50ZHA024-060 specifications

The Carrier 50ZHA024-060 is a remarkable rooftop unit designed for commercial applications, providing both cooling and heating solutions in a compact and efficient manner. Known for its reliability and advanced engineering, this model is ideal for businesses seeking to optimize indoor comfort while maintaining energy efficiency.

One of the key features of the 50ZHA unit is its advanced scroll compressor technology. This innovation not only ensures quiet operation but also offers superior efficiency, reducing operational costs. The unit is designed to deliver a wide range of capacity options, from 24,000 to 60,000 BTU/h, making it versatile for various building sizes and requirements.

The 50ZHA series employs a microprocessor-based control system that enhances user convenience and operational efficiency. This smart technology enables precise temperature control, scheduling, and diagnostics. Furthermore, it offers compatibility with advanced building management systems, allowing for seamless integration into modern HVAC setups.

Energy efficiency is a hallmark of the Carrier 50ZHA024-060, which is equipped with environmentally friendly refrigerants that meet current regulatory standards. This commitment to sustainability is further emphasized by its exceptional SEER and EER ratings, indicating lower energy consumption without compromising performance.

In terms of construction, the 50ZHA series features a robust design with corrosion-resistant materials, ensuring durability even in harsh environmental conditions. The unit’s compact rooftop design simplifies installation and reduces the footprint, making it an excellent choice for urban areas where space is limited.

Moreover, the Carrier 50ZHA models are equipped with advanced filtration systems that improve indoor air quality by minimizing airborne contaminants. This is particularly beneficial for commercial spaces, where maintaining a healthy environment is crucial for employee productivity and wellbeing.

The 50ZHA024-060 also offers various customizable options, including economizers for increased fresh air intake and enhanced humidity control features. These options allow businesses to tailor their HVAC solutions to specific operational needs, ensuring optimal comfort year-round.

In summary, the Carrier 50ZHA024-060 is an exceptional rooftop unit that combines advanced technology, energy efficiency, and user-friendly controls. Its sturdy construction, along with a range of customizable features, makes it a leading choice for commercial HVAC applications, ensuring sustained performance and comfort in diverse settings.
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