Trane CGAX/CXAX Manual page 5

Microchannel condensing coils on cooling-
only units
Conquest chillers are equipped with microchannel
condensing coils allowing excellent heat transfer and a
dramatic improvement of corrosion resistance versus
conventional tubes in fi ns coils. Microchannel coils are
100% aluminum, therefore avoiding galvanic corrosion
which can occur on conventional condensers made with
copper tubes and aluminum fi ns. Microchannel coils are
also well adapted for dirty environment thanks to their
small thickness and fi ns profi le.
Figure 4 - Microchannel condensing coils
Air condenser inlet
Microchannels
for R410A
Heat pump units coils
The condenser coil is made of aluminum fi ns
mechanically bonded to seamless copper tubing and
includes integral subcooling circuit. The coils are factory
leak tested at 5 Mpa. If the unit is to be installed in a
corrosive environment, aluminum fi ns can be pre-coated
with epoxy (optional), with minimum thickness of 8µm,
in order to withstand 1000 hours of salt spray test
according to ISO 9227.
CG-PRC026C-GB
Slit fi ns and brazed contact
for improved heat transfer
and strength
Air
condenser
outlet
Features and Benefi ts
Electronic Expansion Valve
Electronic expansion valve enables tight chilled water
temperature control and low superheat, resulting in
more effi cient full-load and part-load operation.
Application versatility
Extended operating map, allowing chiller operation in
multiple applications:
• Industrial/low temperature process cooling with
precise temperature control capability
• Optimal and reliable operation at high ambient
temperatures.
Figure 5 - Operating map- Cooling-only Model CGAX
50 50
45 45
40 40
35 35
30 30
25 25
20 20
15 15
10 10
5 5
0 0
-5 -5
-10 -10
-15 -15
-20 -20
-15 -15 -10 -10 -5 -5
LWT = Leaving water temperature
Amb Air T = Ambient air temperature
A = Standard operating map
B = Low ambient operating map (Variable air fl ow control)
Minimum start-up/operation ambient based on a
2.22 m/s (5mph) wind across the condenser
A
B
0 0 5 5 10 10 15 15 20 20
LWT (°C)
LWT (°C)
25 25
5