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System Pressures
Technicians with R-22 experience will need to become familiar working with high and
low side pressures that are much higher when using R-410A. A typical R-22 system
operates normally with a high side pressure of approximately 260 psi @ 120°F
condensing temperature, and a low side pressure of approximately 76 psi @ 45°F
evaporator saturation temperature.
A normally operating R-410A system with the same condensing temperature of
120°F and 45°F evaporator saturation temperature will have a high side pressure of
approximately 500 psi, and a low side pressure of approximately 150 psi.
• 5/16-in. socket or drive (most screws are 5/16-in. hex-head)
• 1/4-in. socket or drive (ground screws and control assembly use 1/4-in. machine thread screws)
• 3/8-in. socket or drive (for outdoor fan blade removal)
• 4-mm Allen wrench (for indoor fan blade removal)
• Volt-Ohm meter
• Amp probe
• Needlepoint meter leads
• Sealed system and R-410A recovery equipment
• Thermal paste: WX5X8927
• Extension needed for condenser shroud screws
• Voltage rated pliers (for discharging the capacitor)
Tools Required
Caution
