CAPACITY CONTROL
AIR COOLED CHILLERS
STANDARD SPECIFICATIONS
5
COMPRESSORS
CONDENSERS COILS
The Classic packaged chillers incorporate
stepped load shedding as required by most energy management
systems.
Capacity control is achieved by cycling compressor ON/OFF and cylinder unloading. The use of unloading provides good
part load capacities.
On multiple compressor units, capacity is controlled by a combination of cylinder unloading and compressor staging. See
the following table for the standard and optional capacity control for each unit.
% FULL LOAD CAP ACITY CONTROL
OPTIONAL
OPTIONAL
MODEL NUMBER
OALC 010
OALC 015
OALC 025
OALC 030
OALC 035
OALC 040
OALC 050
OALC 060
OALC 070
OALC 080
OALC 100
OALC 120
OALC 140
OALC 160
OALC 180
OALC 200
OALC 220
OALC 240
100-50-OFF
100-50-OFF
100-50-OFF
100-66-OFF
100-66-OFF
100-75-50-25-OFF
100-75-50-25-OFF
100-83-50-33-OFF
100-83-50-33-OFF
100-83-50-33-OFF
100-75-50-25-OFF
100-75-50-25-OFF
100-91-75-67-50-42-25-16-OFF
100-91-75-67-50-42-25-16-OFF
100-87-75-62-50-37-25-12-OFF
100-87-75-62-50-37-25-12-OFF
100-87-75-62-50-37-25-12-OFF
100-87-75-62-50-37-25-12-OFF
100-50-HGBP-OFF
100-50-HGBP-OFF
100-50-HGBP-OFF
100-66-HGBP-OFF
100-66-HGBP-OFF
100-75-50-25-HGBP-OFF
100-75-50-25-HGBP-OFF
100-83-50-33-HGBP-OFF
100-83-50-33-HGBP-OFF
100-83-50-33-HGBP-OFF
100-75-50-25-HGBP-OFF
100-75-50-25-HGBP-OFF
100-91-75-67-50-42-25-16-HGBP-OFF
100-91-75-67-50-42-25-16-HGBP-OFF
100-87-75-62-50-37-25-12-HGBP-OFF
100-87-75-62-50-37-25-12-HGBP-OFF
100-87-75-62-50-37-25-12-HGBP-OFF
100-87-75-62-50-37-25-12-HGBP-OFF
NOTES:
1. Cylinder unloading on lead compressor o ptional .
2. HGBP=Hot gas bypass available on lead compressor
for all models.
3. HGBP modulates to approximately
50% of its unloaded capacity . Example: OALC 100 with HGBP(25% x 0.5=12.5%
minimum capacity).
All compressors
are semi-hermetic
reciprocating
type and are conforming to ARI 520. These compressors are equipped
with internal motor protection
and also provided with vibration isolators.
Each compressors
has lock-out devices to
protect
it from short
cycling
when shutdown
by
the
safety
controls.
Coils are corrugated fin and tube type, constructed of seamless 3/8 dia copper tubes of thickness 0.016 inch, mechanically bonded to
aluminum fins for maximum heat transfer efficiency. As an option, corrugated copper or coated aluminum fins may be provided.
The fins have full self spacing collars which completely cover each tube. The staggered tube design improve the thermal efficiency. A
separate sub-cooling circuit is provided to prevent flashing of liquid refrigerant. End plates and tube support sheets are14 gauge
galvanized steel, formed to provide structural strength. Each coil is pressure tested in the factory at not less than 450 psi air pressure.
