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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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What should be considered max gh side pressure on 3 zone

Customer Question

what should be considered max high side pressure on 3 zone mini how about a normal low and normal high at 90 o/s air 75 i/s air
Submitted: 1 year ago.
Category: HVAC
Expert:  Phil replied 1 year ago.

Tell me what refrigerant it uses

each type runs at different pressures, R-410 runs over 450 psig at times

R22, half that

Customer: replied 1 year ago.
Expert:  Phil replied 1 year ago.

THe condenser runs 20 to 25F hotter than the outside air, so the head pressure would be between 360 and more likely 390 when the system is fully loaded.

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