53
SERVICE
Electronic Components
CONTROL COMPONENTS — Unit uses an advanced elec-
tronic control system that normally does not require service.
For details on controls refer to Operating Data section.
30GTN,R AND 30GUN,R 040-110, 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. Control 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 retainer on each
panel. To use door retainers: remove bottom pin from door re-
tainer assembly, swing retainer out horizontally, and engage pin
in one of the retainer ears and the hinge assembly.
30GTN,R AND 30GUN,R 130-210, 230A-315A, AND
330A/B-420A/B UNIT CONTROL AND 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 pan-
els are hinged and latched for easy opening. Remove screws to
remove inner panels.
Compressors —
If lead compressor on either refrigerant
circuit becomes inoperative for any reason, circuit is locked off
and cannot be operated due to features built into the electronic
control system. Do not attempt to bypass controls to force com-
pressors to run.
COMPRESSOR REMOVAL — Access to the oil pump end
of the compressor is from the compressor side of the unit. Ac-
cess to the motor end of the compressor is from the inside of
the unit. All compressors can be removed from the compressor
side of the unit.
Following the installation of the new compressor:
OIL CHARGE (Refer to Table 30) — All units are factory
charged with oil. Acceptable oil level for each compressor is
from
1
/
8
to
3
/
8
-in. of sight glass (see Fig. 35).
When additional oil or a complete charge is required, use
only Carrier-approved compressor oil.
30GTN,R approved oils are as follows:
Petroleum Specialties, Inc. — Cryol 150 (factory oil charge)
Texaco, Inc. — Capella WF-32
Witco Chemical Co. — Suniso 3GS
30GUN,R approved polyolester (POE) oils are as follows:
• Mobil Artic EAL 68
• Castrol SW68
• ICI Emkarate RL68H
• Lubrizol 29168 (Texaco HFC Capella 68NA)
• CPI Solest 68
Table 30 — Oil Charge
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 accessible
from the control box end of the unit.
COOLER REMOVAL — Cooler can be removed from the
cooler side of the unit as follows:
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.
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 approxi-
mately 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 com-
pressor circuit breaker, then quickly close the dis-
charge 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. 24. Remove the cooler water-
side strainer.
4. Disconnect the conduit and cooler heater wires, if
equipped. Remove all thermistors from the cooler, being
sure to label all thermistors as they are removed. Ther-
mistor T1 is a well-type thermistor, and thermistor T2 is
immersed directly in the fluid. See Fig. 24.
5. Remove the insulation on the refrigerant connection end
of the cooler.
6. Unbolt the suction flanges from the cooler head. Save the
bolts.
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.
IMPORTANT: All compressor mounting hardware and
support brackets removed during servicing must be rein-
stalled prior to start-up.
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
COMPRESSOR
OIL REQUIRED
Pts L
06E250
14 6.6
06E265
19 9.0
06E275
19 9.0
06E299
19 9.0
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.
Do not close the discharge valve of an operating compres-
sor. Severe damage to the compressor can result.
