Run Power Wiring for Indoor Unit

Be sure field wiring complies with local building codes and NEC, and unit voltage is within limits shown in Table 11.

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.

The 40QNC/QNQ units require their own power supply.

1.Locate the indoor power supply.

2.Locate and install disconnect switch per NEC and local codes.

3.Run power supply wiring to disconnect switch.

4.Run power wiring from disconnect switch to wall mount area.

5.If any accessories are being installed, refer to the individual accessory instructions for guidance on wire routing at this time.

Install All Power, Interconnecting Wiring, Piping and Drain Hose to Indoor Unit .

1.Run control wiring from the outdoor unit through the access hole in the wall and make sure you have enough wire to reach the control box of the unit once hung on the mounting plate.

2.It is a recommended that flare connections is located on the outside of the wall where the indoor unit is to be mounted. If an extension pipe is required to facilitate this location, measure, fabricate and install the extension pipes to the in- door unit before hanging the unit on the mounting bracket.

3.If piping connections are on the outside wall, pass the pipes (refrigerant and drain) through the wall sleeve and then hook the indoor unit body on top of the wall hanging brack- et. Support the unit away from the bottom using a tool or a piece of wood.

NOTE: Tie together the refrigerant piping, the drain hose, and the electrical connection wires and ensure that the drain hose is at the bottom as shown in Fig. 28.

A08364

Fig. 28 - Location of Piping, Hose, and Wiring

4.If required make the flare connections.

5.Route the power and control wiring through the back side of the unit and to the control box area. If the wired remote or zone manger accessory are to be used, perform any modi- fications required at this time. Refer to the Accessory install- ation instructions).

6.Remove the control box cover and finish all indoor unit wiring connections as shown on the wiring diagram or in the accessory installation instructions. Replace the control box cover.

7.Fix the bottom part of the unit to the wall mounting bracket and push it carefully until the two bracket hooks fit into the marked places at the base of the unit until it snaps into place. See Fig. 29.

40QNQ, 40QNC specifications

The Carrier 40QNC and 40QNQ are advanced rooftop packaged units designed for efficient heating and cooling in commercial applications. These units are particularly known for their reliability, versatility, and energy-efficient performance, making them a preferred choice for building owners and HVAC professionals alike.

One of the standout features of the Carrier 40QNC and 40QNQ units is their variable-speed technology. This innovative system allows for precise control of airflow and temperature, ensuring that indoor environments maintain consistent comfort levels while minimizing energy consumption. The variable-speed compressor operates at different speeds based on the cooling demand, leading to reduced energy costs and improved overall efficiency.

In terms of energy performance, both models boast high Seasonal Energy Efficiency Ratios (SEER) and Heating Seasonal Performance Factors (HSPF). This not only contributes to lower energy bills but also helps in meeting energy efficiency standards and regulations in various regions. This makes the 40QNC and 40QNQ ideal for environmentally conscious building projects aiming for sustainability.

Another notable feature is the advanced microchannel coil technology utilized in these units. Microchannel coils are lighter, more compact, and provide enhanced heat exchange capabilities compared to traditional coils. This technology contributes to a more efficient refrigerant flow and ultimately leads to improved performance and durability of the unit.

Moreover, both models come equipped with a robust control system that enhances user interface. With smart thermostat compatibility, users can easily manage their building's climate remotely, ensuring optimal comfort and energy management. These systems are designed to integrate seamlessly with building management systems (BMS), allowing for greater control and optimization.

The construction of the Carrier 40QNC and 40QNQ also deserves mention. The units are built with durable materials designed to withstand harsh weather conditions, providing longevity and reliability. Additionally, the low sound levels produced by these units make them suitable for noise-sensitive settings, ensuring comfort without disruptive operation.

In summary, the Carrier 40QNC and 40QNQ are exemplary rooftop packaged units that combine advanced technology, energy efficiency, and reliable performance. Their variable-speed operation, microchannel coil technology, and robust control systems make them ideal solutions for commercial heating and cooling needs, catering to both comfort and sustainability.