Replacing Cooler; Servicing The Cooler - Carrier 30GTN Service And Troubleshooting Manual

Removing the cooler can be accomplished in one of 2 ways,
depending on the jobsite. Either continue sliding the cooler
toward the end of the unit opposite the tubing and carefully
remove, or pivot the cooler and remove it from the cooler
side of the unit.
REPLACING COOLER — To replace the cooler:
1. Insert new cooler carefully into place. Reattach the screws
into the cooler feet (using saved screws).
On 30GTN,GTR080-110 and 230B-315B units, reattach
the 2 vertical supports under the condenser coil in front
of the cooler using screws saved.
2. Replace the liquid lines and solder at the cooler liquid
line nozzles.
3. Rebolt the suction flanges onto the cooler head using bolts
saved during removal. Use new gaskets for the suction
line flanges. Use compressor oil to aid in gasket sealing
and tighten the suction flange bolts to 70 to 90 ft-lb
(94 to 122 N-m).
NOTE: The suction flange has a 4-bolt pattern. See
Carrier specified parts for replacement part number, if
necessary.
4. Using adhesive, reinstall the cooler insulation on the re-
frigerant connection end of the cooler.
5. Reinstall the thermistors. Refer to Thermistors section on
page 57, and install as follows:
a. Apply pipe sealant to the
replacement coupling for the fluid side, and install it
in place of the original.
Do not use the packing nut to tighten the coupling.
Damage to the ferrules will result.
b. Reinstall thermistor T1 well, and insert thermistor T1
into well.
1 ⁄ -in. NPT threads on the
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Fig. 22 — Cooler Thermistor Locations
c. Install thermistor T2 (entering fluid temperature) so that
it is not touching an internal refrigerant tube, but so
that it is close enough to sense a freeze condition. The
recommended distance is
tube. Tighten the packing nut finger tight, and then tighten
1 1 ⁄ turns more using a back-up wrench.
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6. Install the cooler heater and conduit (if equipped), con-
necting the wires as shown in the unit wiring schematic
located on the unit.
7. Close the air vent at the top of the cooler, and close the
drain on the bottom of the cooler near the leaving fluid
outlet. Both the drain and the air vent are located on the
leaving fluid end of the cooler. See Fig. 22.
8. Reconnect the cooler fluid piping and strainer, and open
the shutoff valves (if installed). Purge the fluid of all air
before starting unit.
9. Open the discharge service valves, close the circuit break-
ers, and open the liquid line service valves for the
compressors.
SERVICING THE COOLER — When cooler heads and par-
tition plates are removed, tube sheets are exposed showing
ends of tubes.
Certain tubes in the 10HB coolers cannot be removed.
Eight tubes in the bundle are secured inside the cooler
to the baffles and cannot be removed. These tubes are
marked by a dimple on the tube sheet. See Fig. 23. If
any of these tubes have developed a leak, plug the tube(s)
as described under Tube Plugging section on page 54.
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1 ⁄ in. (3.2 mm) from the cooler
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