Sierra Basics
The pressure rating of a Sierra-HH400W compressor.
150psi
The nominal discharge pressure range of the low pressure compressor stage.
25-38psi
The normal bearing oil operating temperature range of a Sierra machine.
129°F-154°F
The winding insulation class and maximum rated winding temperature rise of a Sierra motor.
Class F and 239°F
The number of temperature sensors present in a Sierra machine.
5
This is the pressure rating of the 1st stage safety relief valve of a CD8 module.
45psi
The standard aftercooler CTD range of an aircooled Sierra machine.
15-25°F
Nominal range of bearing oil pressure.
40-50psi
The IP23 compatible ventilation system found in Sierra motors.
Open Drip Proof (ODP)
The number of pressure sensors present in a 400HP Sierra machine.
6
This is the designed ambient temperature range of a Sierra compressor.
35°F-115°F
This is the proper inlet valve clearance on a 150HP Sierra with an SG controller and no hole in the butterfly plate.
0.039"
This is the built-in bypass setting of the Sierra oil filter.
25psi
The standard grease interval of a 350HP TEFC Sierra motor.
1,000 hours
The expected resistance value of 3ATT at 221°F.
549.7Ω
The horsepower range where a CD14 module will be found.
125-200HP
This reduces pulsations, vibration, and noise at the discharge of an oil-free airend.
Discharge Venturi
This is a 3-way, 2-position solenoid valve controlled using 120Vac from the triac.
1SV Load Solenoid
The standard service factor of a Sierra motor.
1.15
The pressure trip point for "High I/C Pressure" on an SG equipped Sierra running unloaded.
10psi
The "rotor profile" of the high-pressure Sierra airend.
Male rotor: 4 lobes
Female rotor: 6 lobes
The temperature range of 2ATT.
-58°F to 536°F
This is the maximum acceptable level of sump pressure.
0.029psi (0.8inH2O)
The package power required for a Sierra with a standard 250HP drive motor and 5HP fan motor.
292.5HP
The formula for determining "2nd Stage Over Ratio" in an Xe controlled Sierra.
(3APT+14.5) / (2APT+14.5)