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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 approximately76 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” socket or drive
• 1/4” socket or drive – Ground screws and control assembly use 1/4” machine thread screws
• 3/8” 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 (Part #: WX5X8927)
• Extension needed for condenser shroud screws
Tools Required
Additional Safety Requirements
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