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7. Remove the liquid lines by breaking the silver-soldered
joints at the cooler liquid line nozzles.
8. On 30GTN,GTR and 30GUN,R 080-110 and 230B-315B
units, remove the vertical support(s) under the condenser
coil in front of the cooler. Provide temporary support as
needed. Save all screws for reinstallation later.
9. Remove the screws in the cooler feet. Slide the cooler
slightly to the left to clear the refrigerant tubing. Save all
screws.
Removing the cooler can be accomplished in one of 2 ways,
depending on the jobsite. Either continue sliding the cooler to-
ward the end of the unit opposite the tubing and carefully re-
move, 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,GTR and 30GUN,GUR080-110 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 suc-
tion line flanges. Use compressor oil to aid in gasket seal-
ing 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 59, and install as follows:
a. Apply pipe sealant to the
the replacement coupling for the fluid side, and
install it in place of the original.
1
/
-in. NPT threads on
4
Fig. 24 — Cooler Thermistor Locations
54
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.
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
(3.2 mm) from the cooler tube. Tighten the pack-
ing nut finger tight, and then tighten 1
more using a back-up wrench.
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. 24.
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. 25. If any of these
tubes have developed a leak, plug the tube(s) as described
under Tube Plugging section on page 55.
1
/
in.
8
1
/
turns
4
LIQUID
CONNECTION
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