Compressor Control Module; Figure 16 Access Internal Filter Through Upper Service Door - Bard W24G4 Installation Instructions Manual

25. COMPRESSOR CONTROL MODULE

The compressor control module is standard on models
covered by this manual.
Features
Delay-on-Make Timer
Short Cycle Protection/Delay-on-Break
High Pressure Detection
HPC Status LED
Test Mode
Brownout Protection with Adjustment
Delay-on-Make Timer
A delay-on-make timer is included to be able to delay
startup of the compressor. This is desired when more
than one unit is on a structure so that all of the units
do not start at the same time which could happen
after a power loss or building shutdown. The delay-
on-make time period is 2 minutes plus 10% of the
delay-on-break time period. To ensure that all of the
units do not start at the same time, adjust the delay-
on-break timer on each unit to a slightly different
delay time.
Short Cycle Protection/Delay-on-Break
An anti-short cycle timer is included to prevent short
cycling the compressor. This is adjustable from 30
seconds to 5 minutes via the adjustment knob. Once
FIGURE 16
Access Internal Filter Through Upper Service Door
FILTER
FILTER
SERVICE
DOOR
MIS-3237
a compressor call is lost, the time period must expire
before a new call will be initiated.
High Pressure Detection
High pressure switch monitoring allows for a lockout
condition in a situation where the switch is open. If
the high pressure switch opens, the CCM will de-
energize the compressor. If the switch closes again,
it will then restart the compressor after the delay-
on-break setting has expired on the device. If the
switch trips again during the same thermostat call,
the compressor will be de-energized and the alarm
terminal will be energized indicating an alarm. The
red LED will light and stay on until power is cycled
to the control or a loss of voltage is present at Y
terminal for more than ½ second.
Test Mode
By rapidly rotating the potentiometer (POT) clockwise
(see Figure 17 on page 36), all timing functions will
be removed for testing.
The conditions needed for the unit to enter test mode
are as follows: POT must start at a time less than or
equal to the 40 second mark. The POT must then be
rapidly rotated to a position greater than or equal to
the 280 second mark in less than ¼ second. Normal
operation will resume after power is reset or after the
unit has been in test mode for at least 5 minutes.
Manual 2100-721B
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