Table 24 — Alarms Mode and Sub-Mode Directory

SUB-MODE

KEYPAD ENTRY

ITEM

ITEM EXPANSION

COMMENT

 

 

 

 

 

 

 

CRNT

 

 

 

AXXX or TXXX

CURRENTLY ACTIVE ALARMS

Alarms are shown as AXXX.

 

ENTER

 

 

 

 

Alerts are shown as TXXX.

 

 

 

 

 

 

 

 

 

 

 

 

 

RCRN

 

 

YES/NO

RESET ALL CURRENT ALARMS

 

 

ENTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HIST

 

 

AXXX or TXXX

ALARM HISTORY

Alarms are shown as AXXX.

 

ENTER

 

 

 

 

Alerts are shown as TXXX.

 

 

 

 

 

 

 

 

 

 

 

 

 

RHIS

 

 

 

YES/NO

RESET ALARM HISTORY

 

 

ENTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 25 — Example of Reading and Clearing Alarms

SUB-MODE

KEYPAD

ITEM

ITEM EXPANSION

COMMENT

ENTRY

 

 

 

 

CRNT

ENTER

AXXX or TXXX

CURRENTLY ACTIVE ALARMS

ACTIVE ALARMS (AXXX) OR

 

 

ALERTS (TXXX) DISPLAYED.

 

 

 

 

 

 

 

CRNT

ESCAPE

 

 

 

RCRN

 

NO

 

Use to clear active alarms/alerts

 

 

 

 

ENTER

NO

 

NO Flashes

 

 

YES

 

Select YES

 

ENTER

NO

 

Alarms/alerts clear, YES changes to NO

Temperature Reset — The control system is capable of handling leaving-fluid temperature reset based on return cooler fluid temperature. Because the change in temperature through the cooler is a measure of the building load, the return tempera- ture reset is in effect an average building load reset method. The control system is also capable of temperature reset based on outdoor-air temperature (OAT), space temperature (SPT), or from an externally powered 4 to 20 mA signal. Accessory sen- sors must be used for OAT and SPT reset (HH79NZ073 for OAT and HH51BX006 for SPT). The Energy Management Module (EMM) must be used for temperature reset using a 4 to 20 mA signal.

To use the return reset, four variables must be configured. In the Configuration mode under the sub-mode RSET, items CRST, CRT1, CRT2, and DGRC must be set properly. See Ta- ble 26 on page 44 for correct configuration. See Fig. 2-4 for wiring details.

Under normal operation, the chiller will maintain a constant leaving fluid temperature approximately equal to the chilled fluid set point. As the cooler load varies, the entering cooler fluid will change in proportion to the load as shown in Fig. 21. Usually the chiller size and leaving-fluid temperature set point are selected based on a full-load condition. At part load, the flu- id temperature set point may be colder than required. If the leaving fluid temperature was allowed to increase at part load, the efficiency of the machine would increase.

Return temperature reset allows for the leaving temperature set point to be reset upward as a function of the return fluid temperature or, in effect, the building load.

LEGEND

EWT — Entering Water (Fluid) Temperature

LWT — Leaving Water (Fluid) Temperature

Fig. 21 — Standard Chilled Fluid

Temperature Control — No Reset

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Carrier Air Conditioner specifications Alarms Mode and Sub-Mode Directory, Example of Reading and Clearing Alarms
Page 42 Page 44

Air Conditioner specifications

Carrier Air Conditioners have long been synonymous with reliability and innovation in climate control. Founded by Willis Carrier, the inventor of modern air conditioning, the brand has continuously set industry standards through state-of-the-art technologies and features designed to enhance indoor comfort.

One of the standout features of Carrier air conditioners is their energy efficiency. Many models are equipped with advanced inverter technology, allowing the compressor to adjust its speed based on the cooling demand. This results in decreased energy consumption, which not only reduces utility bills but also lessens the environmental impact. Recognizing the importance of sustainable practices, Carrier has integrated eco-friendly refrigerants into their systems, further promoting energy-efficient operations.

Carrier also emphasizes user comfort through its variable speed systems. These systems maintain consistent temperatures while minimizing temperature fluctuations, ensuring an even distribution of cool air throughout the home. Additionally, many Carrier models come with advanced air filtration systems, designed to capture allergens, dust, and other particulates, thereby improving indoor air quality.

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Durability and noise reduction are also central to the Carrier brand. Many models are designed with sound-dampening features, making them some of the quietest units on the market. This is particularly advantageous for residential use, where noise can disrupt daily activities and sleep.

In terms of design, Carrier air conditioners come in various styles and capacities to suit a wide range of spaces, from compact apartment units to large central systems for sprawling homes. Their extensive warranty and service offerings further reinforce Carrier’s commitment to customer satisfaction.

In conclusion, Carrier air conditioners represent a perfect blend of cutting-edge technology, energy efficiency, and user comfort. Their emphasis on sustainability and smart features positions them as a leading choice for homeowners seeking reliable and innovative climate control solutions. Whether for cooling a small room or an entire house, Carrier remains a trusted name in air conditioning.
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