Bard I42H1D Changing Ventilation CFM Rates in Manual Mode, Changing to Fully Modulating Mode

RECOMMENDED CONTROL SEQUENCES

Several possible scenarios are listed below:

1.Use a programmable electronic thermostat with auxiliary terminal to control the ERV based on daily programmed occupance periods. Bard markets and recommends Bard Part #8403-060 programmable electronic thermostat.

2.Use a motion sensor in conjuntion with a mechanical thermostat to determine occupancy in the structure. Bard markets the CS2000A for this use.

3.Use a DDC control system to control the ERV based upon a room occupancy schedule to control the ERV.

4.Tie the operation of the ERV into the light switch. The lights in a room are usually on only when occupied.

5.Use a manual timer that the occupants turn to energize the ERV for a specific number of hours.

6.Use a programmable mechanical timer to energize the ERV and indoor blower during occupied periods of the day.

NOTE: The ventilation package comes with a blower interlock function, but is disabled when it is shipped from the factory in case you do not utilize a thermostat with an occupancy output, or a occupancy sensor and must tie "A" terminal to "G" terminal to drive the ventilation package. If you do have a thermostat or control that does drive occupancy output, you will need to remove the tape from the orange wire located in the low voltage terminal box, and connect it to the "G" terminal to activate this function. (See Figures 13-19.)

CHANGING VENTILATION CFM RATES IN MANUAL MODE

!	WARNING
HAZARD OF ELECTRICAL SHOCK.
ELECTRICAL SHOCK CAN RESULT
IN SERIOUS INJURY OR DEATH.		2
DISCONNECT THE REMOTE		-
		-754
ELECTRIC POWER SUPPLY OR
		7961
SUPPLIES BEFORE SERVICING.

To adjust the airflow ventilation rate, first refer to Figure 25A to look up the “FLOW INDEX” needed for the intake and exhaust blowers for the CFM you require. Then, perform the following steps:

1.Open front swinging doors of main unit (by popping front door latches).

2.Throw main power disconnect to the “OFF” position to eliminate risk of injury or death due to electrical shock.

3.Remove five (5) screws holding front ERV door in place (See Figure 27).

4.Remove ERV Control Panel Cover by removing four (4) screws (See Figure 27).

5.Locate two 0-10Vdc Motor Control Boards in control panel (See Figure 28).

6.On intake Motor Control Board, observing “GREEN STATUS LIGHT”, turn manual adjust potentiometer “CCW” to increase “FLOW INDEX” or CW to reduce “FLOW INDEX” to

match desired setting.

NOTE: After long pause, the green status light will blink long-blinks for the “TEN COUNT” of the “FLOW RATE INDEX”, then immediately followed by fast blinks which indicate the second digit. For example, a Flow Index of 23 would be two long blinks, followed by 3 fast blinks of the “GREEN STATUS LIGHT”.

7.On exhaust Motor Control Board, observing “GREEN STATUS LIGHT”, turn manual adjust potentiometer “CCW” to increase “FLOW INDEX” or CW to reduce “FLOW INDEX” to

match desired setting.

NOTE: Same “GREEN STATUS LIGHT” blink as Step #6.

CHANGING TO FULLY MODULATING MODE

If you want to operate the ERV in fully variable mode (Fig. 25B) (only run at required speed to maintain set-point CO2 levels), you will need to configure the ERV to the following:

1.Open front swinging doors of main unit (by popping front door latches).

2.Throw main power disconnect to the “OFF” position to eliminate risk of injury or death due to electrical shock.

3.Remove ERV Control Panel Cover by removing four (4) screws (See Figure 27).

4.Locate two 0-10Vdc Motor Control Boards in control panel (See Figure 28).

5.Pull jumper pins from “M” terminals, and move to “P” terminals (See Figure 28).

6.Connect “+” 0-10Vdc output from CO2 control to Terminal #3 (along with pink wire), and connect “-” to Terminal #4 (along with purple wire) of unit low voltage terminal strip.

7.Follow the directions supplied with the CO2 control to configure the control appropriately.

Manual	2100-549G
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