14. Load Shedding Options
Page 59
PRODIGYT M2 UNIT CONTROLLER
14. Load Shedding Options
The M2 may be setup to de−energize half of the mechanical cooling provided by a rooftop unit. A digital input to either the
economizer (A55_P297−9) or the (A133) GP1 board is required. This option is set by adjusting ECTO 7.25. See table 37.
Table 37. Adjusting Load Shedding Options
Options Digital Input (energized for load shedding)
2 or 3 A55_P297−9
4 or 5 A133_P194−1 (TB22−1) (A133 DIP set to GP)
6 or 7 A133_P194−2 (TB22−2) (A133 DIP set to GP)
8 or 9 A133_P194−1 (TB19−1) (A133 DIP set to MGV)
10 or 11 A133_P194−2 (TB19−2) (A133 DIP set to MGV)
12 or 13 A133_P194−1 (TB18−1) (A133 DIP set to VAV)
14 or 15 A133_P194−2 (TB18−2) (A133 DIP set to VAV)
This option also selects the digital input used and determines which compressors are shed on units equipped with 1 or 3
(odd) compressors. See table 38.
Table 38. Compressors Disabled by Load Shedding Options
Unit Size Compressors Disabled By Option 2, 4, 6, 8, 10, 12, 14 Compressors Disabled By Option 3, 5, 7, 9, 11, 13, 15
1 Compressor None CP1
2 Compressors CP2 CP2
3 Compressors CP3 CP2 & CP3
4 Compressors CP3 & CP4 CP3 & CP4
To shut down the whole unit, Digital Input DI 3 on the A55_P299_6 ( A42) can be de−energized. This feature must be enabled
through Prodigy unit configuration.
The M2 readout will display LS" when the unit is in load shedding mode.
The special option 1 will shed all compressors when the DI−3 input opens (de−energizes). This option is available on M2
v7.07 and later.
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