Johnson Controls YC4 Series - Understanding Installation and Operation Limitations; Meeting Requirements for A2 L Equipment

Understanding installation and operation limitations
Install the unit in accordance with all national, state, and local safety codes, and the following
requirements:
• Observe the limitations for the indoor unit, coil, and appropriate accessories.
• Do not install the outdoor unit with any ductwork in the air stream. The outdoor fan is a
propeller fan and is not designed to operate against any additional external static pressure.
• Observe the maximum and minimum conditions for operation to ensure that the system gives
maximum performance and requires minimum service.
Important: Do not operate the unit at outdoor temperatures below 55°F without an approved
low ambient operation accessory kit installed.
Important: The maximum allowable line length for this product is 80 ft.* Consult the Piping
Application Guide (P/N 247077) for installations over the maximum allowable line length.
*This applies to all products except the YC618E2S11, and XC618E2S11 model which will only be
installed up to a 75 ft line set maximum.
Table 8: Application limitations
Ambient air temperature on outdoor coil
(°F)
Air temperature on indoor coil (°F)Model
Minimum DB Maximum DB Minimum WB Maximum WB
YC3/XC3/RC3 55 115 57 72
YC4/YC6/XC4/XC6/RC4/RC6/XC3 3
Phase
55 125 57 72
Meeting requirements for A2L equipment
Make sure that you have all necessary equipment before you begin the installation. You must
adhere to the following requirements when installing or servicing R-454B equipment.
• Gauge sets, hoses, refrigerant containers, and the recovery system must be designed to handle
the POE type oils and the pressures of R-454B.
• Manifold sets must be high side and low side with low side retard.
• All hoses must have a 700 psig service pressure rating.
• Electronic leak detectors can be used for detecting refrigerant leaks. For flammable refrigerants,
check the sensitivity and potentially recalibrate the detector.
• Leak detection fluids are also suitable for use with most refrigerants. Avoid using detergents
containing chlorine, as they can react with refrigerants and corrode copper pipework. Examples
of leak detection methods include the bubble method and fluorescent agents.
• Recovery equipment, including refrigerant recovery containers, must be specifically designed to
handle R-454B.
• Only use a TXV that is specifically designed for R-454B refrigerant.
• If an indirect refrigerating circuit is used, inspect the secondary circuit for refrigerant presence.
• Maintain visible and legible markings on the equipment. Illegible markings or signs should be
corrected.
• Install refrigerant pipes and components in locations where they are unlikely to be exposed to
corrosive substances, unless the components are made from corrosion-resistant materials or
adequately protected against corrosion.
Installation Manual: R-454B Outdoor Split-System Air Conditioner18
Johnson Controls Ducted Systems