Bard WA181 Installation Instructions Manual

Contents

Bard WA181 Installation Instructions Manual Manual pdf 15 page image

Manual 2100-200Page 13Low Pressure Switch, Bypass, and LockoutSequenceIf the low pressure switch opens for more than 120seconds, the compressor contactor will de-energize andgo into a soft lockout. Regardless the state of the lowpressure switch, the contactor will reenergize after thedelay on make time delay has expired. If the low pressureswitch remains open, or opens again for longer than 120seconds the unit will go into manual lockout conditionand the alarm relay circuit will energize. Recycling thewall thermostat resets the manual lockout.Alarm Relay OutputAlarm terminal is output connection for applicationswhere alarm relay is employed. This terminal is poweredwhenever compressor is locked out due to HPC or LPCsequences as described.NOTE: Both high and low pressure switch controls areinherently automatic reset devices. The highpressure switch and low pressure switch cut outand cut in settings are fixed by specific airconditioner or heat pump unit model. Thelockout features, both soft and manual, are afunction of the Compressor Control Module.PRESSURE SERVICE PORTSHigh and low pressure service ports are installed on allunits so that the system operating pressures can beobserved. Pressure tables can be found later in the manualcovering all models. It is imperative to match the correctpressure table to the unit by model number.ADJUSTMENTSAdjustable Delay on Make and Delay on BreakTimerThe potentiometer is used to select Delay on Break timefrom 30 seconds to 5 minutes. Delay on Make (DOM)timing on power-up and after power interruptions is equalto 2 minutes plus 10% of Delay on Break (DOB) setting:0.5 minute (30 seconds) DOB =123 second DOM1.0 minute (60 seconds) DOB =126 second DOM2.0 minute (120 seconds) DOB =132 second DOM3.0 minute (180 seconds) DOB =138 second DOM4.0 minute (240 seconds) DOB =144 second DOM5.0 minute (300 seconds) DOB =150 second DOMDuring routine operation of the unit with now powerinterruptions the compressor will operate on demand withno delay.Typical Settings for Dual Unit Installation:Unit No. 1: DOB set at 2 minutes, and DOM is 132 sec.Unit No. 2: DOB set at 4 minutes, and DOM is 144 sec.High Pressure Switch and Lockout SequenceIf the high pressure switch opens, the compressorcontactor will de-energize immediately. The lockouttimer will go into a soft lockout and stay in soft lockoutuntil the high pressure switch closes and the delay onbreak time has expired. If the high pressure switch opensagain in this same operating cycle the unit will go intomanual lockout condition and the alarm relay circuit willenergize. Recycling the wall thermostat resets themanual lockout.

/ 18

Related manuals for Bard WA181