Phase Monitor; Pressure Service Ports - Bard WA421 Installation Instructions Manual

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

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.
Manual 2100-218
Page 16
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.

PRESSURE SERVICE PORTS

High and low pressure service ports are installed on all
units so that the system operating pressures can be
observed. A pressure table 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.