ADJUSTABLE
On a call for compressor operation the
HIGH PRESSURE SWITCH AND LOCKOUT SEQUENCE (Standard Feature)
If the high pressure switch opens, the compressor contactor will
LOW PRESSURE SWITCH, BYPASS, AND LOCKOUT SEQUENCE (Standard Feature)
If the low pressure switch opens for more that 120 seconds, the compressor contactor will
ALARM OUTPUT
Alarm terminal is output connection for applications where alarm signal is desired. This terminal is powered whenever compressor is locked out due to HPC or LPC sequences as described.
NOTE: Both high and low pressure switch controls are inherently automatic reset devices. The high pressure switch and low pressure switch cut out and cut in settings are fixed by specific air conditioner or heat pump unit model. The lockout features, both soft and manual, are a function of the Compressor Control Module.
ADJUSTMENTS
ADJUSTABLE
The potentiometer is used to select
0.5 minute | (30 seconds) | DOB | = 123 second DOM |
1.0 minute | (60 seconds) | DOB | = 126 second DOM |
2.0minute (120 seconds) DOB = 132 second DOM
3.0minute (160 seconds) DOB = 138 second DOM
4.0minute (240 seconds) DOB = 144 second DOM
5.0minute (300 seconds) DOB = 150 second DOM
LOW AMBIENT CONTROL
Optional Low Ambient Control
An optional low ambient control is available for both factory and field installed options. The low ambient control is to be applied to the PA13 Series models when operation below 55° outdoor conditions are anticipated. Without this device, the evaporating pressure would fall off, and the indoor coil would ice over.
The fan cycling control cycles the fan motor on, once the liquid refrigerant pressure reaches 350 psig, and off, once it has dropped to 225 psig. It will continue to cycle between these parameters depending on outdoor temperatures and the load/stage of the system.
This cycling maintains a minimum liquid pressure affecting the minimum suction pressure. This effect insures an evaporating temperature that is slightly above the point of ice formation on the evaporator.
This field installed option is Bard Part
FIGURE 7
LOW AMBIENT CONTROL WIRING
Manual | |
Page | 17 of 25 |