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Manual 2100-447
Page 1
GENERAL
GENERAL INFORMATION
The economizer should only be installed by a trained
heating and air conditioning technician. These
instructions serve as a guide to the technician installing
the economizer package. They are not intended as a
step by step procedure with which the mechanically
inclined owner can install the package.
The economizer housing is shipped in one carton which
contains the electrical harness, miscellaneous hardware
and installation instructions.
The economizer installation requires an additional two
stage cooling thermostat in place of the normal single
stage cooling thermostat. Also additional low voltage
wire will be required to transmit the second call (Y2) for
cool. (i.e., Use 6 conductor thermostat wire for an air
conditioning unit and 9 conductor thermostat wire for
heat pumps.) See Page 9 for required thermostats.
If using a Bard master controller, the MC91AE master
controller is designed specifically to control two (2)
redundant Bard wall mount units equipped with
economizers.
Any wall mount unit equipped with an economizer must
also have a low ambient control installed. This control
can be factory installed or field installed. If field
installed, use kit CMA-6 (air conditioner models) or
CMH-7 (heat pump models).
UNPACKING
Upon receipt of the equipment be sure to compare the
model number found on the shipping label with the
accessory identification information on the orders and
shipping document to verify that the correct accessory
has been shipped.
Inspect the carton housing of each economizer as it is
received, and before signing the freight bill, verify that
all items have been received and that there is no visible
damage. Note any shortages or damage on all copies of
the freight bill. The receiving party must contact the
last carrier immediately, preferably in writing,
requesting inspection by the carrier’s agent. Concealed
damage not discovered until after loading must be
reported to the carrier within 15 days of its receipt.
DESCRIPTION
The EIFM-5 economizer is designed to be used with
Bard 3-1/2 through 5 ton wall mount series air
conditioners and heat pumps equipped with low ambient
fan cycling controls. They are electromechanical
economizer systems designed to provide “free” cooling
where the outdoor air temperature is cool enough to
provide the needed cooling without running the
compressor. When cooling is needed, the system
automatically takes advantage of cold outdoor air when
available and uses it for first stage cooling. This then
reduces the need to run the air conditioning compressor
providing lower operating costs and increasing the
service life of the equipment. If the outdoor air gets too
warm or humid to be helpful, the enthalpy control
detects the condition and automatically closes the
outdoor air and exhaust damper, opens the return air
damper and switches to the compressor operation. This
is all done automatically to achieve maximum savings
without attention from the user. See Figure 6 for a
block diagram of the economizer operation logic flow.
The unit is equipped with a full modulating type damper
motor which controls the damper position to a factory
set minimum supply air temperature.
EIFM models not suitable for use with hot gas bypass
models.
TABLE 1
(1)
Low ambient control is required with economizer
for low temperature compressor operation.
)1(
LEDOM
HTIWESUROF
STINUGNIWOLLOF
C5-MFIE
83AW24LW24HW
24AW84LW84HW
84AW06LW06HW
94AW07LW83HS
06AW34HS
16AW94HS
07AW16HS
27AW