Bryant 127A - Manual (Page 7)

7
MAJOR COMPONENTS
2--Stage Compressor
The 2--stage compressor contains motor windings that provide
2--pole (3500 RPM) operation.
Compressor Internal Relief
The compressor is protected by an internal pressure relief (IPR)
which relieves discharge gas into compressor shell when
differential between suction and discharge pressures exceeds and
550 -- 625 psi. The compressor is also protected by an internal
overload attached to motor windings.
Compressor Control Contactor
The contactor has a 24 volt coil and is controlled by Y1 input from
the thermostat
High and Low Pressure Switches
High and low pressure switches are provided in line with the Y1
signal to the contactor for protection. The high pressure switch
mounted on the liquid tube is set to open at 670 psi and higher, and
the low pressure switch mounted on the suction tube opens at a
pressure of 50 psi and lower.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible
equipment failure, periodic maintenance must be performed on this
equipment.
Frequency of maintenance may vary depending upon geographic
areas, such as coastal applications. See Owner’s Manual for
information.
127A