Charge
The system holds 4 pounds for Turbotec R-410A unit, because the sub cooling & super heat
vary greatly with air and water temperature. For field charging we use a condensing
temperature of 24 degrees. After power is on and water has been running through unit for at
least 5 minutes your high side temperature should be 24 degrees above water temperature.
Read on control board. Unless the ambient temperature is less than 62 degrees, we expect a
superheat of at least 15 degrees. You may read the suction line temperature by pushing and
holding the “Up” arrow on control board. After about 15 seconds, the board will display
suction line temperature, the board will read Evap and a temp. Please wait for at least 10
minutes run time before checking superheat.
ATTENTION:
Check temperature on both sides of filter. If more than 2 degrees different
the filter is clogged.
TXV (Thermal Expansion Valve)
All units are manufactured with adjustable TXV’s. If you suspect the TXV needs to be
adjusted, please call 954-318-6900 from the jobsite and technical support will walk through it
with you.
Compressor
Broken valves, shafts, (not pumping) and shorted to ground are obvious problems. However,
no starts are commonly misdiagnosed. Check the capacitor for correct MFD’s. Check
connections, voltage and open windings. If open windings, check to see if compressor is hot.
If so, let it cool down, or run cool water over it before condemning. Check Ohm’s: common
to run and common to start should equal run to start. If everything above is correct, then add
hard start to capacitor.
Fan
Please check connections and capacitor before condemning fan motor. If you do have to
change fan motor ALWAYS change capacitor also.
Page 8
Summary of Contents for R-410A
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