Hi my friends,
My company is installing Goodman split systems in a 10 story residential bldg.
The Ah is a 2 ton and 1.5 ton condenser unit rtu mounted. I believe the units to be oversized, especially the ah. We complained but the owner said the distributior doesn't stock the 1.5 ton ah in our region.
They are 1-2 bedroom apartments roughly 500-700sqft.
Upon installation i've been replacing the 2 ton fixed piston in the evap with the 1.5 ton piston from the condenser. The buildings liquid line set seems to be 1/4" then goes to 3/8" at the unit. Suction line 5/8" through bldg to 3/4" at unit. After installation, due to line set length (2nd floor to roof) i charge the unit using 410A according to superheat.
The blower is set at the lowest speed which is 600cfms. The airflow is noisy and blows super hard and in the 1 bedrooms there are only 2 supply drops and a free air return.
My problem is that i have very little superheat and am concerned about liquid floodback. I have a suction p/t of 36° with a suction line temp of 36-37°.
If i remove refrigerAnt, to get proper superheat, ill be below 32° and ice on evap is imminent. If i increase air flow over evap, itll be blowing like a hurricane.
Any suggestions would be greatly appreciated.
Thanks.
My company is installing Goodman split systems in a 10 story residential bldg.
The Ah is a 2 ton and 1.5 ton condenser unit rtu mounted. I believe the units to be oversized, especially the ah. We complained but the owner said the distributior doesn't stock the 1.5 ton ah in our region.
They are 1-2 bedroom apartments roughly 500-700sqft.
Upon installation i've been replacing the 2 ton fixed piston in the evap with the 1.5 ton piston from the condenser. The buildings liquid line set seems to be 1/4" then goes to 3/8" at the unit. Suction line 5/8" through bldg to 3/4" at unit. After installation, due to line set length (2nd floor to roof) i charge the unit using 410A according to superheat.
The blower is set at the lowest speed which is 600cfms. The airflow is noisy and blows super hard and in the 1 bedrooms there are only 2 supply drops and a free air return.
My problem is that i have very little superheat and am concerned about liquid floodback. I have a suction p/t of 36° with a suction line temp of 36-37°.
If i remove refrigerAnt, to get proper superheat, ill be below 32° and ice on evap is imminent. If i increase air flow over evap, itll be blowing like a hurricane.
Any suggestions would be greatly appreciated.
Thanks.
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