Relief Devices — Fusible plugs are located in each cir- cuit to protect against damage from excessive pressures.

HIGH-SIDE PROTECTION — One device is located between condenser and filter drier; a second is on filter drier. These are both designed to relieve pressure on a temperature rise to approximately 210 F (99 C).

LOW-SIDE PROTECTION — A device is located on suc- tion line and is designed to relieve pressure on a temperature rise to approximately 170 F (77 C).

PRESSURE RELIEF VALVES (208/230, 460, 575 v; 60 Hz Units Only) — Valves are installed in each circuit (one per circuit). The valves are designed to relieve at 450 psig (3103 kPa). These valves should not be capped. If a valve relieves, it should be replaced. If valve is not replaced, it may relieve at a lower pressure, or leak due to trapped dirt from the system which may prevent resealing.

The pressure relief valves are equipped with a 3/8-in. SAE flare for field connection. Some local building codes require that relieved gases be removed. This connection will allow conformance to this requirement.

Other Safeties — There are several other safeties that are provided by microprocessor control. For details refer to Alarms and Alerts section on page 48.

PRE-START-UP

IMPORTANT: Before beginning Pre-Start-Up or Start- Up, complete Start-Up Checklist for ComfortLink™ Chiller Systems at end of this publication (page CL-1). The Checklist assures proper start-up of a unit, and provides a record of unit condition, application require- ments, system information, and operation at initial start-up.

Do not attempt to start the chiller until following checks have been completed.

System Check

1.Check all auxiliary components, such as the chilled fluid circulating pump, air-handling equipment, or other equipment to which the chiller supplies liquid. Consult manufacturer’s instructions. If the unit has field-installed accessories, be sure all are properly installed and wired correctly. Refer to unit wiring diagrams.

2.Backseat (open) compressor suction and discharge shut- off valves. Close valves one turn to allow refrigerant pres- sure to reach the test gages.

3.Open liquid line service valves.

4.Fill the chiller fluid circuit with clean water (with recommended inhibitor added) or other noncorrosive flu- id to be cooled. Bleed all air out of high points of system. An air vent is included with the cooler. If outdoor temper- atures are expected to be below 32 F (0° C), sufficient in- hibited ethylene glycol or other suitable corrosion-inhibit- ed antifreeze should be added to the chiller water circuit to prevent possible freeze-up.

5.Check tightness of all electrical connections.

6.Oil should be visible in the compressor sight glass. See Fig. 35. An acceptable oil level in the compressor is from 1/8 in. to 3/8 in. of sight glass. Adjust the oil level as re- quired. No oil should be removed unless the crankcase

heater has been energized for at least 24 hours. See Oil Charge section on page 53 for Carrier-approved oils.

7.Electrical power source must agree with unit nameplate.

8.Crankcase heaters must be firmly locked into compres- sors, and must be on for 24 hours prior to start-up.

9.Fan motors are 3 phase. Check rotation of fans during the service test. Fan rotation is clockwise as viewed from top of unit. If fan is not turning clockwise, reverse 2 of the power wires. For low noise fan option on 50 Hz chillers, fans rotate counterclockwise as viewed from top of unit. If fan is not turning counterclockwise, reverse 2 of the power wires.

10.Check compressor suspension. Mounting rails must be floating freely on the springs.

11.Perform service test to verify proper settings.

*Lead compressor only.

Fig. 35 — Compressor Connections

(Lead Compressor Shown)

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Carrier Air Conditioner specifications Pre-Start-Up, System Check
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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.

The smart technology featured in Carrier air conditioners plays a key role in modern convenience. Many units are compatible with smart home systems, allowing users to control settings remotely via smartphones or voice-activated devices. With features like programmable thermostats, users can easily set cooling schedules to match their lifestyle, ensuring comfort while maximizing energy savings.

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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