Carrier 50ZHA024-060 instruction manual Cooling Charging Chart, Maintenance

Page 14

Table 8—Cooling Charging Chart

SUCTION LINE TEMPERATURE (°F)

Suction Line Pressure (PSIG)

OD Temp. (°F)

52

54

56

59

61

64

67

70

73

76

79

82

85

89

92

45

51

55

60

64

69

—

—

—

—

—

—

—

—

—

—

55

—

—

53

57

62

66

70

—

—

—

—

—

—

—

—

65

—

—

—

—

53

57

62

66

71

75

—

—

—

—

—

75

—

—

—

—

—

—

—

56

61

66

71

76

—

—

—

85

—

—

—

—

—

—

—

—

53

58

63

67

72

—

—

95

—

—

—

—

—

—

—

—

—

50

54

58

62

66

—

105

—

—

—

—

—

—

—

—

—

—

50

53

57

60

64

115

—

—

—

—

—

—

—

—

—

—

49

52

55

58

61

125

—

—

—

—

—

—

—

—

—

—

—

50

53

56

59

SUCTION LINE TEMPERATURE (°C)

Suction Line Pressure (kPa)

OD Temp. (°C)

361

370

387

405

423

442

462

482

502

523

544

566

589

612

636

7

11

13

15

18

21

—

—

—

—

—

—

—

—

—

—

13

—

—

12

14

16

19

21

—

—

—

—

—

—

—

—

18

—

—

—

—

12

14

17

19

21

24

—

—

—

—

—

24

—

—

—

—

—

—

—

13

16

19

22

24

—

—

—

29

—

—

—

—

—

—

—

—

12

14

17

20

22

—

—

35

—

—

—

—

—

—

—

—

—

10

12

14

17

19

—

41

—

—

—

—

—

—

—

—

—

—

10

12

14

16

18

46

—

—

—

—

—

—

—

—

—

—

9

11

13

14

16

52

—

—

—

—

—

—

—

—

—

—

—

10

11

13

15

COOLING OPERATION (SIZES 024-042)

With a call for cooling (Y/Y2), the indoor fan energizes immedi- ately whereas the contactor energizes after a 5 minute time delay (in case of initial start-up) starting the compressor and the outdoor fan motor. When the cooling demand is met, Y/Y2 de-energizes, shutting the compressor, indoor fan and the outdoor fan.

COOLING OPERATION (SIZES 048 AND 060)

These units utilize a 2 stage indoor thermostat. With a first stage call for cooling (Y1), the indoor fan (low stage) energizes immediately whereas the contactor energizes after a 5 minute time delay (in case of an initial start-up) starting the compressor (low stage) and the outdoor fan motor. If the low stage operation cannot satisfy the cooling demand, the second stage cooling (Y2) ener- gizes switching the compressor into high stage cooling through energizing an internal solenoid valve inside the scroll compressor and switching the indoor fan into high stage. When second stage cooling is satisfied, Y2 de-energizes switching the compressor and the indoor fan into low stage cooling. When the low stage cooling demand is met, Y1 de-energizes shutting the compressor, indoor fan and the outdoor fan.

HEATING OPERATION (SIZES 024-042)

With a call for heating (Y1), the indoor fan (low stage) energizes immediately whereas the contactor energizes after a 5 minute time delay (in case of initial start-up) starting the compressor and the outdoor fan motor. If Y/Y2 cannot satisfy the heating demand, the auxiliary or backup heat (W2) energizes. In case of staged heating, W3 is energized if the demand is not met. The highest airflow selected is run while the electric heat is in operation. When heating demand is met, W3, W2 and Y/Y2 sequentially de-energize shutting the compressor, indoor fan and the outdoor fan.

HEATING OPERATION (SIZES 048 AND 060)

With a first stage call for heating (Y1), the indoor fan (low stage) energizes immediately whereas the contactor energizes after a 5 minute time delay (in case of initial start-up) starting the compres- sor (low stage) and the outdoor fan motor. If the low stage oepration cannot satisfy the heating demand, the second stage

heating (Y2) energizes switching the compressor into high stage heating through energizing an internal solenoid valve inside the scroll compressor and switching the indoor fan into high stage. The auxiliary or backup heat is controlled by a third stage (W2). If the demand is not met, W3 is energized in case of staged heating. When heating demand is satisfied, W3, W2 and Y2 sequentially de-energize switching the compressor and the indoor fan into low stage heating. When the low stage heating demand is met, Y1 de-energizes shutting the compressor, indoor fan and the outdoor fan.

CONTINUOUS FAN

With the continuous Indoor fan option selected on the thermostat, G is continuously energized. In case of 024-042 units, the selected airflow setting is provided. In case of 048 and 060 units, the system runs low stage (Y1) airflow for continuous fan operation.

DEFROST

Defrost board (DB) is a time and temperature control, which includes a field-selectable time period between checks for defrost (30, 60, 90 and 120 minutes). The time period is factory-set at 60 minutes and should only be adjusted by a trained service person. Electronic timer and defrost cycle start only when contactor is energized and defrost thermostat (DFT) is closed.

Defrost mode is identical to Cooling mode. The outdoor fan motor stops because of “OF1” and “OF2” contacts opening on the defrost board, a bank of optional electric heat turns on to warm air supplying the conditioned space.

ELECTRIC RESISTANCE HEATING

If accessory electric heaters are installed, on a call for “Emergency Heat” the thermostat energizes W which energizes the heater relay and in turn energizes the electric heaters. The IFR is energized which starts the indoor-fan motor. If the heaters are staged, W2 is energized when the second stage of heating is required. When the need for heating is satisfied, the heater and IFM are de-energized.

MAINTENANCE

To ensure continuing high performance, and to reduce the possi- bility of premature equipment failure, periodic maintenance must

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Contents Table of Contents Safety ConsiderationsIntroduction Unit Base Dimensions, 50ZHA024-060 Provide for Condensate Disposal Unit SpecificationsUnit Damage Hazard HIGH-VOLTAGE Connections Install Electrical ConnectionsPhysical Data PRE-START-UP SizeRequired Subcooling F C Required Liquid Line TemperatureRequired Subcooling Check for Refrigerant Leaks Start-Up Cooling Section and Make AdjustmentsSTART-UP Refrigerant ChargeSize Rated Airflow High Airflow Indoor Airflow and Airflow AdjustmentsFor 208/230-V Blower Motors Typical Unit Electrical Diagram Sizes A05200 Accessory Electric Heater Wiring Electrical Data-50ZHA Sequence of Operation Unit ControlsHIGH-PRESSURE Relief Valve FAN OperationCooling Charging Chart MaintenanceUnit Top Removal Outdoor-Coil Side FIRE, EXPLOSION, Electrical SHOCK, CUT HAZ- ARDAir Filter Indoor Blower and MotorFilter Pressure Drop in. wg Accessory Electric Heat Pressure Drop In. wgWet Coil Pressure Drop Troubleshooting START-UP ChecklistTypical Heat Pump Operation, Heating Mode Troubleshooting-Cooling and Heating Symptom Cause RemedyIII. START-UP Preliminary InformationII. PRE-START-UP

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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