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Manual 2100-390
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 8 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 ordering
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-2 and EIFM-3 economizers are designed to
be used with Bard 1-1/2 thru 3 ton wall mount series air
conditioners and heat pumps 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 the could outdoor air
when available and uses it for first stage cooling. This
then reduces the need to runt 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 for the user. See
Figure 1, Page 9, 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 is required with Economizer for low
pressure compressor operation.
)1(
LEDOM
HTIWESUROF
STINUGNIWOLLOF
B2-MFIE142HW,381HW,152AW,142LW/AW,181LW/AW
B3-MFIE173AW,163HW,103HW,163LW/AW,103LW/AW