Vent Connection Plug; Compressor Control Module; Features; Delay-On-Make Timer - Bard W42AC-A Installation Instructions Manual

Vent Connection Plug

All units are equipped with a vent connection plug in
the side of the control panel for the different ventilation
packages to plug in to. If the compressor will not start
and there is no "Y1" at the compressor control module,
first check to make sure that either the optional vent is
plugged into the vent connection plug or the supplied
jumper plug is in place. The unit will not operate
without anything plugged in. This plug is located on
the side of the control panel behind the front vent door
(behind the filter access door). If the unit is supplied
with a factory-installed vent package, it will be plugged
in but the jumper plug will also be tethered next to the
connection for troubleshooting purposes, if necessary.

Compressor Control Module

The compressor control module (CCM) is standard on
all models covered by this manual.

Features

Delay-on-Make Timer

Short Cycle Protection/Delay-on-Break
Low Pressure Detection
High Pressure Switch
18-30 VAC Input
Y Input from Thermostat
and High Pressure Switch
Troubleshooting Light
Low Pressure Switch
High Pressure Detection
LPC and HPC Status LEDs
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 (see
Figure 22). Once a compressor call is lost, the time
period must expire before a new call will be initiated.
FIGURE 22
8201-164 Compressor Control Module
Brownout Ignore Time DIP Switches*
* Turn on only one switch for that specific ignore time setting.
1500 milliseconds is the maximum brownout ignore time.
Compressor Contactor Output
Alarm Output
Common
Delay-on-Break Time
Adjustment Potentiometer
Manual 2100-692
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