Bard I60H1, I42H1D Teccommercial Room Ventilator System General Description, Control Wiring

I-TECCOMMERCIAL ROOM

VENTILATOR SYSTEM

GENERAL DESCRIPTION

The I-TEC Commercial Room Ventilator (CRV) is designed to be used with all Bard I-TEC models. The only intent of this device is to provide the required ventilation by delivering fresh air to meet I.A.Q. (Indoor Air Quality) requirements. In the installed application, this system also includes exhaust provisions which are balanced with the intake air to maintain building pressurization requirements of ASHRAE 62.1 Standard.

Ventilation is accomplished with (2) blower/motor assemblies for maximum ventilation at low sound levels. The intake and exhaust blowers are programmed independently and are balanced to maintain a slight positive pressurization in accordance to ASHRAE 62.1 Standard.

The I-TEC CRV is also provided with filters to reduce the required service needed and to further improve the I.A.Q. The exhaust air blowers are protected by disposable filters, and the intake air blowers are protected by washable filters. Both are accessible without the need for tools.

CONTROL WIRING

The I-TEC CRV comes wired from the factory set to 375 CFM of ventilation. Care must be taken when deciding how to control the operation of the ventilator. When designing the control circuit for the ventilator, the following requirements must be met.

1.The indoor blower must be run whenever the I-TEC CRV is run.

2.Select and configure the correct CFM ventilation level that the I-TEC CRV needs to operate and configure the system to this level following later instructions within this section. Over ventilating serves no useful purpose and significantly affects the overall efficiency of the heat pump system. System operating costs would also increase.

3.Run the I-TEC CRV only during periods when the conditioned space is occupied. Running the ventilation during unoccupied periods wastes energy, decreases the expected life of the CRV, and can result in large moisture buildup in the structure. Running the CRV when the structure is unoccupied allows moisture to build up in the structure because there is little or no cooling load. Thus, the air conditioner is not running enough to remove the excess moisture being brought in. Use a control system that in some way can control the system based upon occupancy.

Operating the I-TECCRV during unoccupied periods can result in a build up of excess moisture in the structure.

RECOMMENDED CONTROL SEQUENCES

Several possible scenarios are listed below:

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

2.Use Bard CompleteStat™ that incorporates temperature, humidity and occupancy control with learning capability into a single device. No programming required.

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

4.Tie the operation of the CRV 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 CRV for a specific number of hours.

6.Use a programmable mechanical timer to energize the CRV 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.)

SETTING THE VENTILATION CFM LEVELS

The I-TEC CRV has four pre-set levels of ventilation CFM available. These are 300, 375, 450 and 525 CFM of ventilation air. The I-TEC CRV is shipped from the factory set on the 375 CFM ventilation level. To change between these four different levels of provided ventilation CFM, first refer to Figure 21 to look up the corresponding CFM needed for the intake and exhaust blowers to meet the design criteria and determine which “speed/wire color” is needed. Then, perform the following steps.

!	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.

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 six (6) screws holding front CRV door in place (See Figure 22).

4.Locate “Brown Wire with White Trace” that has a black terminal on the end where it connects to the terminal strip (See Figure 21).

5.Move “Brown Wire with White Trace” to the corresponding CFM level needed in accordance with Figure 21.

Manual	2100-549G
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