Product specifications

8
UNIT FEATURES: SCROLL COMPRESSORS (CONT.)
UNIT FEATURES: QUIET AND EXTRA QUIET FAN OPERATION
% Full Load Capacity Control
Model Standard Standard with (Optional HGBP)
(3) (4) (5)
Single Circuit Units Single Circuit Units
ACDS-B with Tandem Compressors
(1)
with Tandem Compressors
(1)
015S 100 - 50 - 0 100 - 50 - (25) - 0
020S 100 - 50 - 0 100 - 50 - (25) - 0
025S 100 - 50 - 0 100 - 50 - (25) - 0
027S 100 - 46 - 0 100 - 46 - (23) - 0
030S 100 - 50 - 0 100 - 50 - (25) - 0
Dual Circuit Units Dual Circuit Units
ACDS-B with (2) Tandem Compressors
(2)
with (2) Tandem Compressors
(2)
025D 100 - 75 - 50 - 25 - 0 100 - 75 - 50 - 25 - (13) - 0
030D 100 - 75 - 50 - 25 - 0 100 - 75 - 50 - 25 - (13) - 0
035D 100 - 74 - 50 - 24 - 0 100 - 74 - 50 - 24 - (12) - 0
040D 100 - 69 - 46 - 23 - 0 100 - 70 - 46 - 23 - (12) - 0
045D 100 - 75 - 50- -25 - 0 100 - 75 - 50- -25 - (13) - 0
050D 100 - 72 - 48 - 24 - 0 100 - 72 - 48 - 24 - (12) - 0
055D 100 - 74 - 48 - 22 - 0 100 - 74 - 48 - 22 - (11) - 0
057D 100 - 75 - 50 - 25 - 0 100 - 75 - 50 - 25 - (13) - 0
060D 100 - 75 - 50 - 25 - 0 100 - 75 - 50 - 25 - (13) - 0
065D 100 - 78 - 59 - 26 - 0 100 - 78 - 59 - 26 - (13) - 0
070D 100 - 80 - 59 - 29 - 0 100 - 80 - 59 - 29 - (15) - 0
080D 100 - 79 - 60 - 27 - 0 100 - 79 - 60 - 27 - (14) - 0
090D 100 - 80 - 60 - 28 - 0 100 - 80 - 60 - 28 - (14) - 0
100D 100 - 80 - 60 - 31 - 0 100 - 80 - 60 - 31 - (16) - 0
Ta b l e 1
Package Mechanical Capacity Control Steps
Notes:
1. Models ACDSB 015S - 030S have 2 Manifolded compressors on a single refrigerant circuit.
2. Models ACDSB 025D - 100D have (2) Sets of 2 Manifolded Compressors on two refrigerant circuits.
3. HGBP = Hot Gas Bypass option available on lead circuit or both circuits for lead-lag operation on dual circuit units.
4. HGBP is only active on the First On/Last Off stage of unit operation.
5. HGBP modulates to approximately one half of the minimum mechanical step of unit loading shown above.
EXAMPLE: ACDSB 060D w/HGBP (25% x .5 = 13% minimum unit capacity)
6. If the minimum load requirement is less than a single unit minimum capacity step can provide, consider using two units
of smaller size piped parallel, with the microcomputer linked together for proper System Control, see the
Application Section of this catalog “Multiple Chiller Per Chilled Water System” on page 19.
Dunham-Bush units are quieter than most in the industry, due
to the design and construction of our units.
Scroll Compressors are considerably quieter than other types
of compressors, due to the smooth gas flow through the scroll
compressor orbital compression cycle, small horsepower, and
few moving parts.
Dunham-Bush standard condenser design uses 1140 RPM open
dripproof condenser fan motors, mounted in resilient motor
supports.
Optional " Extra Quiet 855 RPM Fan and Fan Motors" provide
an " Extra Quiet Condenser". Couple this with the " Extra Quiet
Scroll Compressors” and the ACDS-B Packaged Chillers are
very quiet, smooth operating units, with ‘A’ weighted sound
levels starting at 59 dbA, based on sound power readings in
accordance with ARI 370 Standard Sound Rating of Large
Refrigeration & Air Conditioning Equipment @ 30’ distance
from the unit.