Complete Control Wiring, Install Thermostat

40QAC/38HDR -- 40QAQ/38QRR

Complete Control Wiring

1.Run the control wiring close to the terminal block on the indoor unit.

2.Connect the wires as shown in Fig 18 and Fig. 20 for 38HDR units, and Fig. 19 and Fig. 21 for 38QRR units.

Complete Power Connection To Indoor Unit

Be sure field wiring complies with local building codes and NEC, and unit voltage is within limits shown in Table 12.

Contact local power company for correction of improper line voltage.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Before installing, modifying, or servicing system, main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch. Lock out and tag switch with a suitable warning label.

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation could void any applicable Carrier warranty.

NOTE: Use copper wire only between disconnect switch(es) and unit.

NOTE: Install branch circuit disconnect of adequate size to handle unit starting current per NEC. Locate disconnect within sight of, and readily accessible from, unit, per section 440-14 of NEC. Some codes allow indoor unit to share disconnect with outdoor unit if disconnect can be locked; check local code before installing in this manner.

1. Route ground and power wires.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

According to NEC and most local codes, the unit must have an uninterrupted, unbroken ground to minimize personal injury if an electric fault should occur. The ground may consist of electrical wire or metal conduit when installed in accordance with existing electrical codes.

2.Route line power leads from inside disconnect to the fan coil. Place wire through the whole on the control box.

3.Connect wire to high voltage terminal board (TB1) and ground screw.

NOTE: When routing the wire in the unit, use care to keep the wire away from refrigerant and condensate piping and any sharp edges.

NOTE: The 208/230-v units are factory wired for 230-v to 24-v transformer operation, For 208-v to 24-v operation, interchange the blue (208-v) and red (230-v) wires. Cap any unused wires with wire nuts.

Install Thermostat

These systems use a three speed thermostat. Refer to Table 9 for a list of recommended thermostats.

1.Mount thermostat to a wall in the occupied space using hardware provided with the thermostat. Locate the thermo- stat, preferably on an interior wall, in an area that is not sub- jected to drafts or direct sunlight through windows.

2.Run the thermostat wires to the control box of the indoor unit. If running the thermostat through the back of the unit, 3/8 in. space between the unit and the wall is required.

3.Route wires over refrigerant and drain piping as shown in Fig. 24.

*Field-supplied.

A09533

Fig. 24 - Routing Wires Over Piping

NOTE: Do not route wires under the piping, or wires could impede air filter removal.

4.Connect the thermostat wires to the indoor unit per Fig 25 for a 40QAC unit and Fig. 26 for a 40QAQ unit.

40QAC specifications

The Carrier 40QAC is a standout product in the realm of commercial air conditioning systems. This air-cooled chiller is designed to meet a variety of cooling needs while ensuring energy efficiency and reliability. One of the most notable features of the 40QAC is its advanced scroll compressor technology, which is engineered to provide consistent performance with reduced noise levels. This makes it an ideal choice for applications where minimizing sound pollution is crucial, such as in urban settings or near sensitive environments.

In terms of energy efficiency, the 40QAC boasts impressive ratings, with a high coefficient of performance (COP) that helps to lower operational costs and reduce environmental impact. Its design integrates various energy-saving features, including variable speed fans and a robust control system that optimizes performance based on real-time demand. This adaptability allows the chiller to maintain comfort levels while consuming less energy than traditional models.

The 40QAC is equipped with a microprocessor-based control system that simplifies operation and enhances user experience. This intelligent control interface allows operators to monitor performance metrics, adjust settings, and troubleshoot any issues remotely, increasing overall system reliability. The system is also designed to be compatible with building management systems, which facilitates seamless integration into existing infrastructure.

Another prominent characteristic of the Carrier 40QAC is its robust construction. Built with high-quality materials, it offers excellent durability and longevity, even in challenging environmental conditions. The unit also incorporates features to streamline maintenance, such as accessible component layout and easy-to-remove panels, ensuring that downtime for servicing is minimized.

Safety is another critical aspect of the Carrier 40QAC’s design. It’s engineered with numerous safety protocols to protect against overheating, overpressure, and other potential hazards, guaranteeing both system integrity and peace of mind for operators.

Overall, the Carrier 40QAC is a versatile and efficient solution for commercial cooling needs. With its technological advancements, energy-saving features, and robust design, it stands out as a reliable choice for businesses looking to balance performance with sustainability. The 40QAC not only promises efficient cooling but does so while aligning with the growing demand for eco-friendly solutions in today's marketplace.