Carrier 30GTR Specifications download pdf (Page 53)

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

⁄

-in. NPT threads on 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.

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

⁄

in. (3.2 mm) from the cooler

tube.Tighten the packing nut ﬁnger tight, and then tighten

⁄

turns 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. 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.

Fig. 22 — Cooler Thermistor Locations

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 83 84

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Carrier 30GTR Specifications Page 53

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