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7. Once it has been determined that a compressor is wanted on, the MAGNUM reviews the ‘NO RUN
CIRCUIT CONTROL STATES’ for an available compressor.
8. The condenser fan control logic runs once every second. Pumps and fans are cycled based on the
compressor(s) discharge pressure and Set Point #45 to #55, depending on condenser type.
9. The Capacity State & Circuit/Compressor State can be viewed via the ‘STATUS’ option under the ‘Menu’
Key on the MAGNUM keypad or using PC-Connect software on a Windows based computer.
10. The chiller safeties (Comp No Stop, Phase Loss, Emergency Stop, Chilled Water Freeze Protection),
are checked once every second. (All of chiller safeties are options features). Once a chiller safety has
occurred the user is required to correct the problem and reset the unit using the ‘Lckout RST’ from the
Menu on the MAGNUM’s keypad or thru MCS-CONNECT.
11. If the compressor relay output is turned on, either by computer or manual, the compressor safeties are
checked once every second. The follow compressor safeties are supported:
a. Low & Unsafe Suction Pressure
b. Low & Unsafe Differential Oil Pressure
c. Low & High Discharge Pressure
d. High Discharge temperature
e. Low & High Motor Ampere
f. No Compressor Proof
g. Freeze protection
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