Start UP

IMPORTANT INSTALLER NOTE

For improved start up performance wash the indoor coil with a dish washing detergent.

HIGH PRESSURE SWITCH

The WA381, WA484, WA491 and WA602 models are supplied with a remote reset high pressure switch. If tripped, this pressure switch may be reset by turning the thermostat off then back on again.

THREE PHASE SCROLL COMPRESSOR START UP INFORMATION

Scroll compressors, like several other types of compressors, will only compress in one rotational direction. Direction of rotation is not an issue with single phase compressors since they will always start and run in the proper direction.

However, three phase compressors will rotate in either direction depending upon phasing of the power. Since there is a 50-50 chance of connecting power in such a way as to cause rotation in the reverse direction, verification of proper rotation must be made. Verification of proper rotation direction is made by observing that suction pressure drops and discharge pressure rises when the compressor is energized. Reverse rotation also results in an elevated sound level over that with correct rotation, as well as, substantially reduced current draw compared to tabulated values.

Verification of proper rotation must be made at the time the equipment is put into service. If improper rotation is corrected at this time there will be no negative impact on the durability of the compressor. However, reverse operation for over one hour may have a negative impact on the bearing due to oil pump out.

NOTE: If compressor is allowed to run in reverse

rotation for several minutes, the compressor’s internal protector will trip.

All three phase ZR compressors are wired identically internally. As a result, once the correct phasing is determined for a specific system or installation, connecting properly phased power leads to the same Fusite terminal should maintain proper rotation direction.

The direction of rotation of the compressor may be changed by reversing any two line connections to the unit.

PHASE MONITOR

All units with three phase scroll compressors are equipped with a 3 phase line monitor to prevent compressor damage due to phase reversal.

The phase monitor in this unit is equipped with two LEDs. If the Y signal is present at the phase monitor and phases are correct the green LED will light.

If phases are reversed, the red fault LED will be lit and compressor operation is inhibited.

If a fault condition occurs, reverse two of the supply leads to the unit. Do not reverse any of the unit factory wires as damage may occur.

CONDENSER FAN OPERATION

The condenser fan motor on 230/208 volt, one and three phase, 60 HZ units is a two speed motor that comes factory wired on high speed for peak performance. If ambient conditions permit, it can be reconnected to low speed (red wire) for lower sound level. See wiring diagram.

50 HZ models must have fan wired on low speed. These models are factory wired on low speed.

SERVICE HINTS

1.Caution homeowner to maintain clean air filters at all times. Also, not to needlessly close off supply and return air registers. This reduces air flow through the system, which shortens equipment service life as well as increasing operating costs.

2.Switching to heating cycle at 75° F or higher outside temperature may cause a nuisance trip of the remote reset high pressure switch. Turn thermostat off then on to reset the high pressure switch.

3.Check all power fuses or circuit breakers to be sure they are the correct rating.

4.Periodic cleaning of the outdoor coil to permit full and unrestricted airflow circulation is essential.

Manual 2100-398 Page 14

WA423, WA381, WA484, WA491, WA602 specifications

Bard is a leading manufacturer in the field of air conditioning and heating solutions, known for its innovative products that cater to both residential and commercial needs. Among their notable models are the Bard WA381, WA602, WA484, WA491, and WA423, each designed with specific features and technologies that enhance efficiency, reliability, and user comfort.

The Bard WA381 is a compact unit that excels in energy efficiency and ease of installation. With a focus on high-performance cooling and heating capacities, this model is ideal for areas requiring reliable temperature control in limited spaces. Its advanced engineering ensures low noise operation, making it suitable for quiet environments, such as libraries and offices. The WA381's user-friendly controls and robust construction make it a favored choice among contractors and users alike.

The WA602 model stands out for its dual functionality, providing both cooling and heating. This unit incorporates state-of-the-art heat pump technology, allowing for year-round comfort. With a high Seasonal Energy Efficiency Ratio (SEER) rating, the WA602 combines cost-effective performance with eco-friendly operation. Its durable design and weather-resistant features ensure long-term reliability, even in harsh environments.

Bard's WA484 offers a seamless blend of performance and versatility. This model is equipped with advanced refrigeration technology, providing superior cooling efficiency. The WA484 is designed to accommodate varying load conditions, making it adaptable to numerous applications. Additionally, its intelligent control systems facilitate easy monitoring and adjustments, promoting optimal energy use and user convenience.

The WA491 is engineered with a focus on energy conservation and performance. With a high Energy Efficiency Ratio (EER), this unit minimizes operational costs while delivering exceptional climate control. The WA491's robust construction includes advanced insulation and weatherproofing, ensuring effective performance in diverse conditions. Furthermore, its features include remote monitoring capabilities, allowing users to manage their heating and cooling systems from anywhere.

Lastly, the WA423 is designed for maximum flexibility and efficiency. This model boasts a compact footprint, making it suitable for various installations. With an emphasis on quiet operation, the WA423 is perfect for settings where noise reduction is critical. It is equipped with modern control systems that optimize performance while reducing energy consumption, making it an eco-friendly choice for users.

Collectively, these Bard models reflect a commitment to quality, efficiency, and user satisfaction, setting the benchmark for heating and cooling solutions in the market.