Compressor; Compressor Control Module (Ccm); Delay-On-Make Timer; Short Cycle Protection/Delay-On-Break - Bard MEGA-TEC W090A Service Instructions Manual

NOTE: If compressor is allowed to run in reverse
rotation for an extended period of time, the
compressor's internal protector will trip.
All three phase compressors are wired identically
internally. As a result, once the correct phasing is
determined for a specific system or installation,
connecting properly phased power leads to the same
Fusite terminal should maintain proper rotation direction.
The direction of rotation of the compressor may be
changed by reversing any two line connections to the
wall-mount unit.

Compressor Control Module (CCM)

Delay-on-Make Timer

Short Cycle Protection/Delay-on-Break

Test Mode

High Pressure Detection

Brownout Protection with Adjustment
The LPC terminals are jumpered in this application.
Instead, the low pressure transducer is used for low
pressure monitoring.
Each compressor uses an independent CCM.
High Pressure Switch
18-30 VAC Input
Y Input from Thermostat
and High Pressure Switch
Troubleshooting Light
Manual 2100-671C
Page 24 of 59
Delay-on-Make Timer
In the event of power loss, 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
32). Once a compressor call is lost, the time period must
expire before a new call will be initiated.
10% of this time is also considered on the delay-on-
make timer (see Delay-on-Make Timer).
FIGURE 32
8201-164 Compressor Control Module
Jumper
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