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 (A2, A3, A4, B2, and B3), and
close the discharge valves for these compressors.
Do not close the discharge valve of an operating
compressor. Severe damage to the compressor can
result.
b. After the lag compressors have shut down, 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, and remove the cooler fluid piping. Remove the cooler
fluid-side strainer (130-210, 230A-315A, and 330A/B-
420A/B only).
3. 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. 23.
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. Thermistor
T2 is immersed directly in the fluid. Thermistors T1, T5,
and T6 are friction-fit well-type thermistors. See Fig. 23.
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 30GT080-110 and 230B-315B units, remove the two
vertical supports 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
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.
LEGEND
EXV — Electronic Expansion Valve
T
— Thermistor
*And associated modular units (see Table 1).
Fig. 23 — Cooler Thermistor Locations
SIZE 080-110*
SIZE 130-210*
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