RT-SVX063E-EN
105
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.
NNoottee:: 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
Low ambient condenser fan motors are available as a
factory installed option for all tonnages. When this
option is equipped, one fan motor for each condenser
v-coil assembly will have its speed controlled by a VFD.
These speed adjustments are primarily based on the
head pressure transducer's reading for each refrigerant
circuit.
Table 55. 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. , p. 105 lists the minimum
recommended mechanical cooling setting for standard
ambient units by application and unit type.
Table 56. 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
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