Functional Control
ESIE10-01
2–46
Part 2 – Functional Description
3
1
2
4
5
2.3.4
Condenser Fan Control
Saturated
condenser
temperature target
The condenser fan control logic will attempt to control the saturated condenser temperature to a
calculated target. A base condenser target is calculated based on evaporator saturated temperature.
The equation is:
Base saturated condenser target = 5/6 (saturated evaporator temperature) + 3.5°C.
This value is then limited to a maximum and minimum determined by the Condenser Target Maximum
and Minimum set points. If these set points are both set to the same value, then the saturated
condenser temperature target will be locked at that value.
Fan staging
The fan stage shall be adjusted in steps of 1 fan.
Fan staging shall accommodate anywhere from 5 to 12 fans according to the table below:
Staging up
Six stage up dead bands shall be used. Stages one through five should use their respective dead
bands. Stages six through twelve should all use the sixth stage up dead band.
When the saturated condenser temperature is above the the active deadband, a Stage Up
error is accumulated.
Stage up Error Step = Saturated Condenser Refrigerant temperature - ( Stage Up dead band)
The Stage Up Error Step is added to Stage Up Accumulator once every 5 seconds, only if the
Saturated Condenser Refrigerant Temperature is not falling. When Stage Up Error Accumulator is
greater than 20 another stage is added.
When a stage up occurs or the saturated condenser temperature falls back within the Stage Up dead
band the Stage Up Accumulator is reset to zero.
Staging down
Five stage down dead bands shall be used. Stages two through five should use their respective dead
bands. Stages six through twelve should all use the stage six dead band.
When the saturated condenser refrigerant temperature is below the Target - the active deadband, a
Stage Down error is accumulated.
Stage Down Error Step = (Target - Stage Down dead band) - Saturated Condenser Refrigerant
temperature.
Output Number
1
2
3
4
5
6
# of fans
# of DO
*
* *
* *
5
4
* * *
*
*
*
6
* * *
* *
* *
7
5
* * *
* *
* *
*
8
*
*
* *
* *
* * *
9
*
*
* *
* *
* * *
*
10
6
*
*
* *
* *
* * *
* *
11
*
*
* *
* *
* * *
* * *
12
Summary of Contents for EWAD620-C17C-SS
Page 2: ......
Page 8: ...ESIE10 01 1 2 Part 1 System Outline 3 1 1 5...
Page 111: ...ESIE10 01 General Outline Part 1 System Outline 1 105 3 1 4 5 1 36 1 Power Compressor 1 2...
Page 112: ...General Outline ESIE10 01 1 106 Part 1 System Outline 3 1 1 4 5 1 36 2 Power Compressor 3...
Page 113: ...ESIE10 01 General Outline Part 1 System Outline 1 107 3 1 4 5 1 36 3 Kit Pumps...
Page 122: ...General Outline ESIE10 01 1 116 Part 1 System Outline 3 1 1 4 5 1 36 12 Digital Inputs Board...
Page 123: ...ESIE10 01 General Outline Part 1 System Outline 1 117 3 1 4 5 1 36 13 Digital Outputs Board...
Page 124: ...General Outline ESIE10 01 1 118 Part 1 System Outline 3 1 1 4 5 1 36 14 Digital Outputs Board...
Page 127: ...ESIE10 01 General Outline Part 1 System Outline 1 121 3 1 4 5 1 36 17 Extension Control Fans 4...
Page 131: ...ESIE10 01 General Outline Part 1 System Outline 1 125 3 1 4 5 1 36 21 EEXV Compressor 1...
Page 134: ...General Outline ESIE10 01 1 128 Part 1 System Outline 3 1 1 4 5 1 36 24 EEXV Compressor 2...
Page 137: ...ESIE10 01 General Outline Part 1 System Outline 1 131 3 1 4 5 1 36 27 EEXV Compressor 3...
Page 138: ...General Outline ESIE10 01 1 132 Part 1 System Outline 3 1 1 4 5 1 36 28 Pumps Control...
Page 139: ...ESIE10 01 General Outline Part 1 System Outline 1 133 3 1 4 5 1 36 29 Terminals M1 M2...
Page 140: ...General Outline ESIE10 01 1 134 Part 1 System Outline 3 1 1 4 5 1 36 30 Terminals M3...
Page 141: ...ESIE10 01 General Outline Part 1 System Outline 1 135 3 1 4 5 1 36 31 Terminals M5 MQ...
Page 148: ...General Outline ESIE10 01 1 142 Part 1 System Outline 3 1 1 4 5...
Page 150: ...ESIE10 01 2 2 Part 2 Functional Description 3 1 2 5...
Page 170: ...The Digital Controller ESIE10 01 2 22 Part 2 Functional Description 3 1 2 4 5...
Page 200: ...Functional Control ESIE10 01 2 52 Part 2 Functional Description 3 1 2 4 5...
Page 202: ...ESIE10 01 3 2 Part 3 Troubleshooting 3 1 3 5...
Page 254: ...Alarms and Events ESIE10 01 3 54 Part 3 Troubleshooting 3 1 3 4 5...
Page 266: ...Controller Inputs and Outputs ESIE10 01 3 66 Part 3 Troubleshooting 3 1 3 4 5...
Page 280: ...ESIE10 01 4 2 Part 4 Commissioning and Test Run 3 1 4 5...
Page 286: ...Pre Test Run Checks ESIE10 01 4 8 Part 4 Commissioning and Test Run 3 1 4 5...
Page 289: ...ESIE10 01 Running Data Part 4 Commissioning and Test Run 4 11 3 4 5 1...
Page 290: ...Running Data ESIE10 01 4 12 Part 4 Commissioning and Test Run 3 1 4 5...