HEF2 Series MANUAL
104
16.3.
Dew point control
❖
The dew point probe measures the Absolute Humidity (SHA) and must be placed after the
evaporative cooler. It controls the pre-heating coil (BC1) via the PID loop. This BC1 must have
10-20% extra capacity as a safety factor.
❖
The Temperature probe (ST1) is located in the drive and controls the Post-heating coil (BC2) via
the PID loop. This BC2 must have 10-20% extra capacity as a safety factor.
❖
The pump starts whenever moisture is required and will wet all the cassettes.
❖
A constant internal heat load is assumed for a constant ambient temperature. If this is not the
case, a room temperature sensor (ST2) must be added. This will control the Post-heating coil
(BC2) via the PID loop.
❖
This type of control will have an accuracy of about ± 3% RH.
❖
Care must be taken with the accuracy of the probes used. It must be remembered that the RH
may vary due to regulation by the electronic control system.
BC1
SHA
A
BC2
ST1
HEF2E
ST2
BC1/BC2:
Coil Pre-Heating / Post-Heating
ST1/ ST2:
Temperature sensor 1 / Temperature sensor 2
SHA:
Absolute Humidity Sensor
Summary of Contents for HEF2 SERIES
Page 2: ...HEF2 Series MANUAL 2...
Page 13: ...HEF2 Series MANUAL 13 Machine type rating plate Partly completed machinery type rating plate...
Page 66: ...HEF2 Series MANUAL 66 Wiring Diagram connections Dimensions GDB13 1 GDB13 1...
Page 67: ...HEF2 Series MANUAL 67 Adjusting A B Auxiliary contacts...
Page 69: ...HEF2 Series MANUAL 69 Wiring Diagram connections Dimensions...
Page 70: ...HEF2 Series MANUAL 70 Manual positioning...
Page 76: ...HEF2 Series MANUAL 76 13 9 G Perimeter closures cover plates dimensional drawings...
Page 78: ...HEF2 Series MANUAL 78 Dimensional drawing for Top Cover Plates...
Page 98: ...HEF2 Series MANUAL 98 H1 ON OFF or BUS...
Page 101: ...HEF2 Series MANUAL 101 1 Cassette ON 2 Cassettes ON 3 Cassettes ON Ideal Stage Control...
Page 102: ...HEF2 Series MANUAL 102 Control by stages or control ON OFF...
Page 103: ...HEF2 Series MANUAL 103 H1 ON OFF 0 10Vcc regulated or BUS...
Page 105: ...HEF2 Series MANUAL 105 Dew point control Dew point control...
Page 106: ...HEF2 Series MANUAL 106 H1 ON OFF or BUS...
Page 117: ...HEF2 Series MANUAL 117...
Page 120: ...HEF2 Series MANUAL 120 Remove the PP R D25 piping to the header PP R D25 pipe...
Page 121: ...HEF2 Series MANUAL 121...
Page 122: ...HEF2 Series MANUAL 122...
Page 123: ...HEF2 Series MANUAL 123...
Page 125: ...HEF2 Series MANUAL 125...
Page 126: ...HEF2 Series MANUAL 126 23 CLEANING THE INDIVIDUAL IRRIGATION SYSTEM...
Page 127: ...HEF2 Series MANUAL 127...
Page 128: ...HEF2 Series MANUAL 128 24 LIST OF SPARE PARTS...