Carrier 30GTR Specifications download pdf (Page 52)

SERVICE

ELECTRIC SHOCK HAZARD.

Turn off all power to unit before servicing.

The ENABLE/OFF/REMOTE CONTACT

switch on control panel does not shut off con-

trol power; use ﬁeld disconnect.

Electronic Components

CONTROLCOMPONENTS — Unit uses an advanced elec-

tronic control system that normally does not require service.

For details on controls refer to Operating Data section.

30GTN,R040-110,AND 230B-315B UNIT CONTROL BOX

— When facing compressors, main control box is at left end

of unit. All incoming power enters through main box. Con-

trol box contains power components and electronic controls.

Outer panels are hinged and latched for easy opening. Re-

move screws to remove inner panels. Outer panels can

be held open for service and inspection by using door re-

tainer on each panel. To use door retainers: remove bottom

pin from door retainer assembly, swing retainer out horizon-

tally, and engage pin in one of the retainer ears and the hinge

assembly.

30GTN,R130-210, 230A-315A,AND 330A/B-420A/B UNIT

CONTROLAND MAIN POWER BOXES —The main power

box is on the cooler side of the unit, and the control box is

on the compressor side. Outer panels are hinged and latched

for easy opening. Remove screws to remove inner panels.

Compressors — If lead compressor on either refriger-

ant circuit becomes inoperative for any reason, circuit is locked

off and cannot be operated due to features built into the elec-

tronic control system. Do not attempt to bypass controls to

force compressors to run.

COMPRESSOR REMOVAL — Access to the pump end

of the compressor is from the compressor side of the unit.

Access to the motor end of the compressor is from the inside

of the unit. All compressors can be removed from the com-

pressor side of the unit.

IMPORTANT:All compressor mounting hardware and

support brackets removed during servicing must be re-

installed prior to start-up.

Following the installation of the new compressor:

Tighten discharge valves to —

Compressor(s)

20 to 25 ft-lb (27 to 34 N-m) 06E250

80 to 90 ft-lb (109 to 122 N-m) 06E265,275,299

Tighten suction valves to —

80 to 90 ft-lb (109 to 122 N-m) 06E250

90 to 120 ft-lb (122 to 163 N-m) 06E265,275,299

Tighten the following ﬁttings to —

120 in.-lb (13.5 N-m) High-Pressure Switch

OIL CHARGE (Refer to Table 28) — All units are factory

charged with oil. Acceptable oil level for each compressor is

from

⁄

of sight glass.

When additional oil or a complete charge is required, use

only Carrier-approved compressor oil.

Approved oils are as follows:

Petroleum Specialties, Inc. — Cryol 150 (factory oil charge)

Texaco, Inc. — Capella WF-32

Witco Chemical Co. — Suniso 3GS

Table 28 — Oil Charge

COMPRESSOR

OIL REQUIRED

Pts L

06E250 14 6.6

06E265 19 9.0

06E275 19 9.0

06E299 19 9.0

Do not reuse drained oil or any oil that has been exposed

to atmosphere.

Cooler — The cooler is easily accessible from the cooler

side of the unit. The refrigerant feed components are acces-

sible from the control box end of the unit.

COOLER REMOVAL — Cooler can be removed from the

cooler side of the unit as follows:

Open and tag all electrical disconnects before any work

begins. Note that cooler is heavy and both ﬂuid-side and

refrigerant-side may be under pressure.

1. To ensure the refrigerant is in the condenser, follow this

procedure:

a. Open the circuit breakers and close the discharge valves

for the lag compressors in both circuits.

Do not close the discharge valve of an operating com-

pressor. Severe damage to the compressor can

result.

b. After the lag compressor discharge service valves have

been closed, close the liquid line service valve for one

circuit. Allow the lead compressor to pump down that

circuit until it reaches approximately 10 to 15 psig

(68.8 to 103.2 kPa).

c. As soon as the system reaches that pressure, shut down

the lead compressor by opening the compressor cir-

cuit breaker, then quickly close the discharge service

valve for that compressor.

d. Repeat the procedure for the other circuit.

2. Close the shutoff valves, if installed, in the cooler ﬂuid

lines. Remove the cooler ﬂuid piping.

3. Cooler may be under pressure. Open the air vent at the

top of the cooler, and open the drain on the bottom of the

cooler (near the leaving ﬂuid outlet) to drain the cooler.

Both the drain and the air vent are located on the leaving

ﬂuid end of cooler. See Fig. 22. Remove the cooler

waterside strainer.

4. Disconnect the conduit and cooler heater wires, if equipped.

Remove all thermistors from the cooler, being sure to la-

bel all thermistors as they are removed. Thermistor T1 is

a well-type thermistor, and thermistor T2 is immersed

directly in the ﬂuid. See Fig. 22.

5. Remove the insulation on the refrigerant connection end

of the cooler.

6. Unbolt the suction ﬂanges from the cooler head. Save the

bolts.

7. Remove the liquid lines by breaking the silver-soldered

joints at the cooler liquid line nozzles.

8. On 30GTN,GTR080-110 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.

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Carrier 30GTR Specifications Page 52

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