Orifice Removal & Installation
The orifice installed in the air handler has been sized for use with the most popularly matched outdoor units. The orifice size as shipped from the factory is listed on the air handler rating plate. Perform steps 1 - 9 to confirm that the orifice size meets the requirements outlined in the outdoor unit installation manual.
1.Remove the cap from the end of the liquid line.
2.Verify pressurization by depressing the Schrader valve on the end of the liquid line. Listen for any escaping gas.
If there is no pressure, test the coil for leakage.
•If leakage is found, clearly mark the location of the leak and return the coil to the distributor for processing.
•If no leaks are found, the coil may be installed.
3.Depress the valve to relieve all pressure from the coil.
4.Remove and discard the valve core.
CAUTION:
To prevent damage to the unit or internal components, it is recommended that two wrenches be used when loosening or tightening nuts. Do not over tighten!
5.Using two wrenches, loosen the nut and distributor body as shown in Figure 6. Turn the assembly nut counter-
6.Insert a
7.Check the actual size of the new orifice. NOTE: The size is stamped on its side. Do not use pin gauges to measure the orifice diameter.
8.Insert the new orifice into the distributor body, rounded end down. See Figure 8.
CAUTION:
To prevent damage to the unit or internal components, it is recommended that two wrenches be used when loosening or tightening nuts. Do not over tighten!
9.Realign the assembly nut on the distributor body and hand tighten both components. Mark a line on both bodies and then tighten an additional 1/4 turn using two wrenches.The movement of the two lines will show how much the nut is tightened. If a torque wrench is used, tighten to
Figure 7. Removal of Orifice
Figure 8. Restrictor Insertion into Distributor Body
Connecting the Linesets
IMPORTANT NOTES FOR HORIZONTAL OR DOWNFLOW INSTALLATIONS WITH TXV VALVE:
•The sensing bulb must be located flush against the suction line for optimum heat transfer.
•Avoid attaching the sensing bulb to the lowest part of the suction line where condensate may accumulate.
•Do not locate the sensing bulb on vertical sections of the lineset.
•For horizontal lines, the bulb should not be located at 12 or 6 o’clock position of the suction line. The best location is at 4 or 8 o’clock.
•For additional information on proper sensing bulb locations, please refer to the valve manufacturer’s instructions.
IMPORTANT: The steps in the Orifice Removal & Installation section must be performed before the linesets are connected.
Figure 6. Loosening of Nut & Distributor Body
9