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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
2.0 minute (120 seconds)DOB = 132 second DOM
3.0 minute (180 seconds)DOB = 138 second DOM
4.0 minute (240 seconds)DOB = 144 second DOM
5.0 minute (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 No. 1: DOB set at 2 minutes, and DOM is 132
seconds
Unit No. 2: DOB set at 4 minutes, and DOM is 144
seconds
Manual 2100-277
Page 18
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.
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.
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