104
RT-SVX063G-EN
Refrigeration
Electronic Compressor Protection
Module (CPM)
The CSHN*** compressors come equipped with a
compressor protection device (CPM) capable of detecting
phase reversal, phase loss, and motor overheating. When
a fault is identified, the output relay will open. Depending
on the fault, the CPM may either auto-reset or it may lock-
out. The CPM can be manually reset by cycling control
power.
Note: If the compressor has tripped due to an overheated
windings condition, the motor winding temperature
sensor resistance (PTC) will be 4500 ohms or
greater; the resistance must be less than 2750 ohms
before the 5 minute reset timer becomes enabled.
Low Ambient Condenser Fans
Operation
Table 56. Minimum outside air temperature
Low Ambient Unit Minimum Outside Air
Temperature for Mechanical Cooling
Without Hot Gas Bypass
0°F
With Hot Gas Bypass
10°F
Standard Ambient Condenser Fans
Standard ambient units stage condenser fans down to a
minimum of one fan per circuit. All standard ambient units
ship with the Symbio™ controller set to allow mechanical
cooling down to 50°F outdoor temperature. This setting is
adjustable. Below table lists the minimum recommended
mechanical cooling setting for standard ambient units by
application and unit type.
Table 57. Minimum outside air temperature
Standard Unit Minimum Outside
Air Temperature for Mechanical
Cooling
Std &
High Cap
units
eFlex™ units
20, 60,
70, 75
ton
25, 30,
40, 50,
55 ton
Economizer - A/C Applications
45°F 45°F 50°F
No Economizer - 80/67F design return
air 45°F 45°F 55°F
No Economizer - 90/78F design return
air 50°F 50°F 70°F
Performance Data
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