9.Connect lead with fork terminal to corresponding points on terminal strip. Re.: C.Y.G. (See wiring diagram.)

10.Wire nut leads with 5/8" stripped ends to Y1 and Y2 leads from thermostat. See wiring diagram in this manual or on economizer.

NOTE: Wires referenced in Note 1 on wiring diagram are for special control application only and are not normally used. These wires may be used in conjunction with other circuitry to open the damper regardless of outside temperature and humidity. Consult factory for details.

11.Close control panel cover

12.Reinstall the blower access panel at top of unit and secure with sheet metal screws.

13.Replace filter bracket, filter and four (4) screws in front condenser grille.

14.ECONOMIZER CHECK OUT

A.Remove mist eliminator (Figure 3). Locate the minimum position potentiometer. (See Figure 5.)

B.Energize the evaporator blower by switching thermostat to the manual fan position with heat /cool in the OFF position.

C.Cycle the minimum position potentiometer (factoryset for 0% fresh air) 0 to full open. (See Figure 5.) Throughout checkout procedure observe operation of damper to insure there is free, unobstructed operation through the entire angle of damper travel. Then adjust the damper minimum open position to meet local codes or application requirements. See example below.

EXAMPLE:

1.Measure return air temperature (RAT) (assume 75°F for example).

2.Measure outdoor air temperature (OAT) (assume 60°F for example).

3.Calculate the mixed air temperature (MAT) which will result from the desired combination of OAT (10 percent) and RAT (90 percent).

.1 OAT + .9 RAT = MAT

5.Mark correct setting on dial of minimum position potentiometer for future reference.

D.Adjust the enthalpy control to position A, B, C, or D to achieve the maximum combination of temperature and humidity acceptable for the installation as per Table 2 below. The suggested setting is between A & B 70° DB @ 55 percent RH. Further recommendation is to always set the control at C or above. (See Figure 5.)

E.Switch the thermostat fan control to automatic, and position the heat cool switch to cool. Adjust the thermostat temperature to engage the first stage of cooling only (Y). This will cause the dampers to modulate to achieve mixed air temperature of 55° provided outside air enthalpy is sufficiently low. If enthalpy is too high for economizing, low enthalpy can be simulated by temporarily removing and jumping leads on terminal 2 and 3 of enthalpy control together. This will also cause the economizer damper to modulate away from minimum position. (Be sure to properly reconnect leads at end of checkout procedure.)

F.Readjust temperature on the thermostat to engage the second stage of cooling (Y2). The damper motor should return to previously set minimum position. Compressor motor should start.

G.Switch thermostat to OFF fan and OFF heat/ cool positions to de-energize unit. Economizer damper should return to full closed (100 percent return air) position. Checkout is complete.

15.Replace control access panel and mist eliminator.

16.Remove blank off plate or barometric fresh air damper if installed on the service access panel. Plug the four (4) holes used to mount the BOP or BFAD with the plastic plugs supplied with the economizer.

16.Replace service access panel.

17.Economizer is now ready for operation.

or substituting example values

 

 

TABLE 2

 

 

ENTHALPY CONTROL SETTING

 

.1 (60° F) + .9 (75° F) = 73.75° F

 

 

 

 

 

 

Dial

 

 

 

 

4. Adjust the minimum

 

 

 

 

 

 

Setting

20% RH

50% RH

 

80% RH

position potentiometer

 

 

 

 

 

 

 

 

 

 

knob until proper mixed air

 

 

A

80 deg .F

73 deg. F

 

66 deg. F

temperature, as calculated

 

 

(26 deg. C)

(23 deg. C)

 

(19 deg.C)

 

 

 

 

above, is reached. Care

 

Enthalpy

B

76 deg. F

70 deg. F

 

63 deg. F

should be taken to insure

 

 

 

(24 deg. C)

(21 deg. C)

 

(17 deg. C)

thermometer is sensing

 

Control

 

 

 

 

 

 

 

 

 

74 deg. F

66 deg. F

 

59 deg. F

air that is well mixed.

 

Setting

C

 

 

 

(23 deg. C)

(19 deg. C)

 

(15 deg. C)

 

 

 

 

 

 

 

 

D

71 deg. F

63 deg. F

 

54 deg. F

 

 

 

(21 deg. C)

(17 deg. C)

 

(12 deg. C)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Manual 2100-449A

 

 

 

 

 

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Bard EIFM-3C installation instructions Economizer Check OUT, Enthalpy Control Setting
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EIFM-3C specifications

The Bard EIFM-3C represents a significant advancement in the realm of indoor furnace systems, designed for optimal efficiency and reliability. This innovative heating solution is engineered to meet the demands of residential and commercial environments, standing out due to its robust performance and enhanced energy efficiency.

One of the hallmark features of the EIFM-3C is its advanced modulating gas valve technology. This allows the furnace to adjust its output based on the specific heating requirements of the space, ensuring consistent comfort while minimizing energy consumption. This feature not only helps in reducing utility bills but also extends the life of the unit, as it operates at varying capacities rather than running at full blast constantly.

The furnace is also equipped with a high-efficiency blower motor that enhances air circulation throughout the property. This technology not only optimizes airflow but also operates more quietly than traditional motors, contributing to a peaceful indoor environment. Additionally, the energy-efficient design of the Bard EIFM-3C typically allows for an impressive Annual Fuel Utilization Efficiency (AFUE) rating, which is a crucial factor for homeowners and businesses looking to reduce their environmental footprint.

To ensure durability and longevity, the EIFM-3C comes with a heavy-duty heat exchanger, built to withstand the rigors of daily use. This component is essential for efficient heat transfer and has been designed to minimize the risk of rust and corrosion, ensuring that the furnace provides consistent performance over the years.

Another defining characteristic of the Bard EIFM-3C is its ease of installation and maintenance. The unit's compact design allows it to fit into various spaces without hassle, making it a versatile option for different applications. Moreover, the accessible service panels facilitate straightforward maintenance, ensuring that technicians can perform necessary checks and repairs quickly and efficiently.

The Bard EIFM-3C is also compatible with smart home technology, providing users with the ability to monitor and control their heating system remotely. This feature not only enhances user convenience but also supports energy management practices, allowing for greater control over heating schedules and preferences.

In summary, the Bard EIFM-3C is a cutting-edge furnace system that combines innovative technology with practical design and user-friendly features. Its energy efficiency, durable construction, and compatibility with modern home technology make it a top choice for those seeking a reliable and sustainable heating solution.
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