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E Series units are an excellent option for performance and effi ciency.
These units include R-410a refrigerant, advanced technology and
innovative components to provide a safe, clean way to heat and cool
your home. The E Series was the fi rst geothermal heating and cooling
system to use R-410a, an environmentally safe, performance-enhancing
refrigerant that does not harm the Earth's ozone layer.
Depending on the size, the compressor in the unit could be reciprocating
(sizes 024, 030, 035), Scroll (sizes 040, 047, 058, 066), or Dual Capacity
(sizes 036, 048, 060, 072). Dual capacity compressors have the ability to
operate in both low and high stage, depending on the heating and cool-
ing requirements. In the event that the fi rst stage of operation (part ca-
pacity) does not satisfy the thermostat, the unit will automatically change
to second stage (full capacity) compressor operation. In order to change
from fi rst stage to second stage, units with dual capacity compressors
require a brief OFF cycle. This is normal and will not affect your comfort
due to the short changeover time.
Single speed units are available with either variable speed ECM or single speed PSC blower motors. Dual capac-
ity units include ECM blower motors. In units equipped with variable speed blowers, you may notice the fan speed
change depending on the mode of operation.
A sophisticated microprocessor control sequences all components during operation for optimum performance with
the ability to signal various fault conditions (see page 33). The microprocessor also provides easy-to-use trouble-
shooting features and on-board diagnostics for your dealer to quickly identify and resolve service issues. Safety
features include high- and low-pressure refrigerant controls to protect the compressor, freeze protection, and fan
start detection. In the unlikely event of a compressor failure, the emergency heat is enabled to satisfy heating
requirements. Another sensor detects if the condensate drain pan is full, at which time the unit will be shut down for
protection against water leaks (see page 33). In units equipped with hot water assist, hot water temperatures are
monitored to ensure that dangerous limits are not reached.
E Series units equipped with variable speed ECM blowers have the ability to operate in a special “dehumidifi ca-
tion” mode during cooling. In the event that the desired temperature is reached before adequate dehumidifi cation is
achieved in cooling, you may benefi t from operating in this mode. Contact your dealer if you experience this condi-
tion.
Product durability features include heavy-gauge metal cabinets which are coated with durable poly paint for long
lasting protection. E Series units include coated air coils for long life and cupronickel coaxial heat exchangers for
added corrosion resistance.
These units are performance-certifi ed to ARI ISO 13256-1 standards, are ETL safety listed, and are
ENERGY STAR® qualifi ed.
E Series Units
PRODUCT INFORMATION FOR UNITS, OPTIONS & ACCESSORIES
