Start UP

IMPORTANT INSTALLER NOTE

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

HIGH PRESSURE SWITCH

The WL484 and WL602 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 ZR3 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.

SEQUENCE OF OPERATION

COOLING – Circuit R-Y makes at thermostat pulling in compressor contactor, starting the compressor and outdoor motor. The G (indoor motor) circuit is automatically completed on any call for cooling operation or can be energized by manual fan switch on subbase of constant air circulation. On all 230 volt units there is a one minute off delay on the blower motor. 460 volt models do not have an off delay. On a call for heating, circuit R-W1 make at the thermostat pulling in heat contact for the strip heat and blower operation. On a call for second stage heat, R-W2 makes bringing on second heat contactor, if so equipped.

Manual 2100-400 Page 14

WL423, WL602, WL484 specifications

Bard WL484, WL602, and WL423 are part of Bard's innovative line of heating, ventilation, and air conditioning (HVAC) products designed to meet the diverse needs of residential and commercial spaces. Each model is characterized by advanced technologies that enhance energy efficiency, performance, and user comfort.

The Bard WL484 model showcases a heating capacity of 48,000 BTU and operates efficiently in various environments. This unit incorporates a robust heat exchanger, which allows for rapid heating without sacrificing efficiency. One of the standout features of the WL484 is its integrated control system that allows users to set precise temperatures, enhancing comfort while minimizing energy usage. Additionally, this model is designed with superior airflow capabilities, providing even temperature distribution throughout the space it serves.

The Bard WL602, with a heating capacity of 60,000 BTU, emphasizes versatility and performance. This unit is equipped with a multi-speed blower that adjusts the airflow according to the specific heating requirements of the environment. The WL602 is engineered with a durable cabinet that resists corrosion, ensuring longevity and reduced maintenance needs. It also includes advanced diagnostic capabilities, allowing users to identify issues quickly and streamline servicing. With its enhanced efficiency ratings, the WL602 is a solid choice for larger spaces requiring reliable and economic heating solutions.

The Bard WL423 model serves as an efficient option for smaller spaces with a heating capacity of 24,000 BTU. This compact unit is designed to fit into tighter spaces while delivering exceptional performance. One unique characteristic of the WL423 is its quiet operation, making it suitable for environments where noise levels must be kept to a minimum, such as offices or bedrooms. Additionally, it features energy-efficient components that help reduce operating costs over time, making it an attractive option for budget-conscious consumers.

In summary, Bard WL484, WL602, and WL423 each bring distinct advantages to the HVAC market, with features designed for optimal performance, energy efficiency, and user satisfaction. These models represent Bard's commitment to quality and innovation, ensuring that customers can find the right solution for their specific heating needs. Whether for residential or commercial applications, Bard continues to be a trusted name in climate control technology.