RLC-PRC006-EN4
Table 1. RTAC efficiency vs Ashrae 90.1
RTAC - Exceeding the Efficiency Standard
Full Load Efficiency (EER*) Part Load Efficiency (EER*)
Tonnage ASHRAE 90.1 Standard Efficiency High Efficiency ASHRAE 90.1 Standard Efficiency High Efficiency
140 9.6 9.7 10.3 10.4 13.2 13.6
155 9.6 9.8 10.4 10.4 13.5 13.9
170 9.6 9.9 10.5 10.4 13.2 13.7
185 9.6 9.7 10.3 10.4 13.1 13.5
200 9.6 9.6 10.1 10.4 12.9 13.3
225 9.6 9.6 10.2 10.4 13.2 13.6
250 9.6 9.6 10.1 10.4 12.8 13.0
275 9.6 9.7 10.4 10.4 13.3 13.8
300 9.6 9.6 10.1 10.4 13.7 13.8
350 9.6 9.6 10.4 10.4 13.2 14.5
400 9.6 9.6 10.0 10.4 13.7 13.9
450 9.6 9.6 n/a 10.4 14.0 n/a
500 9.6 9.6 n/a 10.4 13.9 n/a
COP = EER/3.414.
Efficiencies given for 60 Hz units
Features and
Benefits
ASHRAE Standard 90.1 and
RTAC World Class Energy
Efficiency…
The importance of energy efficiency
cannot be understated. Fortunately,
ASHRAE has created a guideline
emphasizing its importance.
Nonetheless, energy is often dismissed
as an operational cost over which the
owner has little control. That perception
results in missed opportunities for
energy efficiency, reduced utility bills,
and higher profits. Lower utility bills
directly affect profitability. Every dollar
saved in energy goes directly to the
bottom line. Trane’s RTAC is one way to
maximize your profits.
ASHRAE Standard 90.1 & Executive
Order - New technology applied to the
design, controls, and manufacturing
have created excellent efficiency levels in
the RTAC that are helping to push
industry minimums to new heights. All
Trane air-cooled chillers meet the new
efficiency levels mandated by ASHRAE
Standard 90.1. This new standard
requires higher efficiencies than past
technologies can deliver. The US Federal
Government has adopted standard 90.1
and, in some cases, requires even higher
efficiencies. Federal Executive Order
mandates energy consuming devices
procured must be in the top 25% of their
class. In the case of chillers, that product
standard is ASHRAE 90.1. Trane’s RTAC
meets and exceeds the efficiency
requirements of 90.1, while the high
efficiency RTAC can meet the “stretch
goals” of Executive Order.
Precise Capacity Control. Trane’s
patented unloading system allows the
compressor to modulate infinitely and
exactly match building loads. At the
same time chilled water temperatures
will be maintained within +/- 1/2ºF
[0.28°C] of setpoint. Reciprocating and
screw chillers with stepped capacity
control do well to maintain chilled water
temperatures within 2ºF [1.1°C] of
setpoint. Stepped control also results in
overcooling your space because rarely
does the capacity of the machine match
the building load. The result can be 10%
higher energy bills. Trane’s RTAC
optimizes the part load performance of
your machine for energy efficiency,
precise control for process applications,
and your personal comfort regardless of
the weather outside.
