Pressure Service Ports

High Pressure Switch and Lockout Sequence

If the high pressure switch opens, the compressor contactor will de-energize immediately. The lockout timer will go into a soft lockout and stay in soft lockout until the high pressure switch closes and the delay on break time has expired. If the high pressure switch opens again in this same operating cycle the unit will go into manual lockout condition and the alarm relay circuit will energize. Recycling the wall thermostat resets the manual lockout.

Low Pressure Switch, Bypass, and Lockout Sequence

If the low pressure switch opens for more than 120 seconds, the compressor contactor will de-energize and go into a soft lockout. Regardless the state of the low pressure switch, the contactor will reenergize after the delay on make time delay has expired. If the low pressure switch remains open, or opens again for longer than 120 seconds the unit will go into manual lockout condition and the alarm relay circuit will energize. Recycling the wall thermostat resets the manual lockout.

Alarm Relay Output

Alarm terminal is output connection for applications where alarm relay is employed. This terminal is powered whenever compressor is locked out due to HPC or LPC sequences as described.

NOTE: Both high and low pressure switch controls are inherently automatic reset devices. The high pressure switch and low pressure switch cut out and cut in settings are fixed by specific air conditioner or heat pump unit model. The lockout features, both soft and manual, are a function of the Compressor Control Module.

ADJUSTMENTS

Adjustable Delay on Make and Delay on Break Timer

The potentiometer is used to select Delay on Break time from 30 seconds to 5 minutes. Delay on Make (DOM) timing on power-up and after power interruptions is equal to 2 minutes plus 10% of Delay on Break (DOB) setting:

0.5 minute	(30 seconds)	DOB = 123 second DOM
1.0 minute	(60 seconds)	DOB = 126 second DOM

2.0minute (120 seconds) DOB = 132 second DOM

3.0minute (180 seconds) DOB = 138 second DOM

4.0minute (240 seconds) DOB = 144 second DOM

5.0minute (300 seconds) DOB = 150 second DOM

During routine operation of the unit with no power interruptions the compressor will operate on demand with no delay.

Typical Settings for Dual Unit Installation:

Unit 1: DOB set at 2 minutes, and DOM is 132 seconds

Unit 2: DOB set at 4 minutes, and DOM is 144 seconds

High and low pressure service ports are installed on all units so that the system operating pressures can be observed. Pressure tables can be found later in the manual covering all models. It is imperative to match the correct pressure table to the unit by model number.

Manual 2100-192 Page 14

WA301, WA361 specifications

The Bard WA361 and WA301 are two advanced wall-mounted air conditioning systems designed for commercial and residential use. These units are engineered to provide efficient cooling and heating while optimizing energy consumption.

One of the standout features of the Bard WA361 and WA301 models is their compact design. This allows for easy installation in various spaces where traditional floor-mounted units may not fit. Ideal for areas such as classrooms, offices, or small retail locations, these units can be mounted high on the wall, freeing up valuable floor space.

Both models leverage Bard’s advanced heat pump technology. This technology allows for reverse-cycle functionality, meaning they can provide both cooling in summer and heating in winter. The WA361 model offers a heating capacity of up to 36,000 BTUs while the WA301 provides a slightly lower capacity of 30,000 BTUs, making them suitable for different size requirements.

Energy efficiency is prioritized in these models. They come equipped with high Seasonal Energy Efficiency Ratings (SEER), which ensures lower electric bills and reduced environmental impact. Additionally, the units have been designed to operate quietly, maximizing comfort without the disruptive noise often associated with HVAC systems.

Another notable characteristic is the advanced control system. The Bard WA361 and WA301 feature programmable thermostats that allow users to set specific comfort levels according to their schedules. This not only enhances user control but also boosts energy-saving potential.

Moreover, both models are built with durable materials to ensure longevity and reliability. Their internal components are engineered to withstand harsh conditions, making them a preferred choice for various settings, including industrial environments.

Bard emphasizes ease of maintenance in the design of these units. The filters are easily accessible and can be replaced or cleaned with minimal effort. This feature significantly extends the lifespan of the unit and ensures that it operates at peak performance.

In summary, the Bard WA361 and WA301 air conditioning units represent a blend of innovative technology and practical design. Their energy-efficient operation, compact installation capability, and advanced heating and cooling functions make them exemplary solutions for those seeking reliable comfort control in diverse applications. Whether for small businesses or residential spaces, these units aim to deliver exceptional performance with a focus on sustainability and efficiency.