FloAire DX COIL - Manual (Page 4)

EVAPORATOR IOM
Installation
1. Carefully remove the coil from the shipping package to avoid damage to the finned area.
Damaged fins can be straightened using an appropriate fin comb.
2. Heatcraft recommends cleaning the coil with a commercially available coil cleaner prior
to installation. Refer to Maintenance on Page 6 for cleaning recommendations.
3. Proper clearance should be maintained between the coil and other structures such as the
fan, filter racks, transition areas, etc.
4. Inspect the refrigerant distributor and verify that the nozzle is in place. The nozzle is
generally held in place by a retaining ring or it is an integral part of the distributor itself
(see Figure 2 - Distributor). If a hot gas bypass kit was ordered with the coil, the nozzle
will be located in it rather than the distributor (see Figure 3 - Hot Gas Bypass Kit).
5. All field brazing and welding should be performed using high quality materials and an
inert gas purge (such as nitrogen) to reduce oxidation of the internal surface of the coil.
6. If a hot gas bypass kit was ordered with the coil install it now. Complete installation
instructions are in the box that contains the hot gas bypass kit. Align the side port with
the hot gas line prior to brazing into place.
7. Connect the suction line and suction connection.
8. Install the expansion valve. Follow the expansion valve manufacturer’s recommenda-
tions for installation to avoid damaging the valve. If the valve is externally equalized, use
a tubing cutter to cut off the plugged end of the factory installed equalizer line. Next, use
a de-burring tool to remove any loose metal from the equalizer line and attach it to the
expansion valve. If the valve is internally equalized, the factory installed equalizer line
can be left as is or it can be cut back and sealed.
9. The expansion valve’s remote sensing bulb should be securely strapped to the horizontal
run of the suction line at the 3 or 9 o’clock position and insulated.
10. Connect the liquid line to the expansion valve.
Pressurize the coil, expansion valve assembly and suction connection to 100 psig with
dry nitrogen or other suitable gas. The coil should be left pressurized for a minimum of
10 minutes.
11. If the coil holds pressure, the hook-up can be considered leak free. If the pressure drops
by 5 psi or less, repressurize the coil and wait another 10 minutes. If the pressure drops
again, there are more than likely one or more small leaks, which should be located and
repaired. Pressure losses greater than 5 psi would indicate a larger leak, which should be
isolated and repaired. Be sure to check valves and fittings as potential sites for leakage
or bleed. If the coil is found to be leaking, contact your local Heatcraft representative.
Unauthorized repair of the coil may void the coil’s warranty (see Heatcraft’s warranty
policy on back cover).
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