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Controls

Controls. Controls. Control Options. On/Off (Electric or Pneumatic) Modulating (Electric or Pneumatic) BMS ( BACnet , LonWorks , Johnson N2, Modbus ). Controls. Basic Controls On/Off and Modulating. Room or duct versions Measure humidity levels Use internal humidifier circuitry.

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Controls

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  1. Controls

  2. Controls Control Options • On/Off (Electric or Pneumatic) • Modulating (Electric or Pneumatic) • BMS (BACnet, LonWorks, Johnson N2, Modbus)

  3. Controls Basic Controls On/Off and Modulating • Room or duct versions • Measure humidity levels • Use internal humidifier circuitry

  4. Controls BMS Control • Links XPS • Simplified Links2 package • BAS only, Online removed • More user friendly • Easier configuration • Improved pricing • Links 2 • Includes BAS Gateway • Also includes OnLine • Works with most units • Many protocols

  5. % RH A Time (t) Set Point B Note: Set point in middle of dead band Controls On/Off Control Humidistat Principle of Operation Dead Band • Humidity drops to point B – Humidifier turns on • Humidity reaches point A – Humidifier turns off • The space between A and B is the dead band

  6. Controls On/Off Controls • Three main types of On/Off controls • Control Humidistat • High Limit • Air Proving • Other On/Off Interfaces • Switches • Relays • BMS • Duct Humidistat • / High Limit • Wall Humidistat • Air Proving Switch

  7. Controls On/Off Control Humidistat Digital Wall Humidistat • Features • Accuracy of ± 5% • Outdoor temperature set back • No loss of set parameters when returning from power failure • Fan relay • Display • Sensed RH in the space • Set point • Outdoor temperature setback • Demand signal • Fan active

  8. Controls On/Off Control Humidistat Digital Duct Humidistat / High Limit • Features • Accuracy of ± 5% • Outdoor temperature set back • No loss of set parameters when returning from power failure • Fan relay • Integrated Sensor • Display • Sensed RH in the space • Set point • Outdoor temperature setback • Demand signal • Fan active

  9. Controls On/Off Controls Fan Relay Timing • Call for humidity – Fan relay closes and fan turns on • 10 second delay – Humidifier relay closes and unit begins to humidify • Humidity demand satisfied – Humidifier relay opens and unit stops humidifying • 90 second delay – Fan relay opens and fan turns off

  10. Controls On/Off Control Humidistat Digital Duct Humidistat Package On/Off Wall Humidistat without Sensor • Features • Accuracy of ± 5% • Outdoor temperature set back • No loss of set parameters when returning from power failure • Remote duct sensor • Display • Sensed RH in the space • Set point • Outdoor temperature setback • Demand signal + 2-10V Remote Duct Sensor

  11. Controls On/Off Controls Wiring Control humidistat A High limit B Air proving C Other (Safeties/Interlock) D E x t e r n a l 1 2 I n t e r n a l Humidifier Terminal Strip

  12. Controls Modulating Controls Principle of Operation % RH Modulating Proportional Band A On/Off Time (t) Set Point B Note: Set point in middle of dead band • Humidity is below point B - unit is on 100% • Humidity rises above Set-point - unit ramps down • Humidity drops below Set-point - unit ramps up • The space between A & B is the proportional band

  13. 100% RH RH % Demand Demand signal varies across P-Band 0 10 { 20 30 Proportional Band (P-Band) 40 SP 50 SP 60 70 80 90 100 0% RH Controls Principle of Operation P, PI, and PID Control • Proportional Controller (P) • A proportional controller will send a demand signal that varies proportionally through a range called the proportional band (P-band). The set point is typically located within the middle of this range.

  14. Controls Principle of Operation P, PI, and PID Control • Proportional Control Stabilization • Demand <50% of humidifier capacity • Offset • P-band • SP • Time (t) Demand >50% of humidifier capacity • Offset • P-band • SP • Time (t)

  15. Controls Principle of Operation P, PI, and PID Control • Proportional Plus Integral Controller (P-I) • The integral function looks at the accumulated offset over time and adjusts the output of the controller as required to eliminate it. • Proportional Plus Integral Control Stabilization • Point of Stabilization • SP • Time (t) • ArtificialSP

  16. Controls Principle of Operation P, PI, and PID Control • Proportional Plus Integral Plus Derivative Controller (P-I-D) • The derivative function looks at the rate of change of the proportional offset over time to and adjusts the output of the controller to minimize it. • Proportional Plus Integral Control Stabilization • Point of Stabilization • SP • Time (t) • ArtificialSP • P-I • P-I-D

  17. Controls Modulating Controls • Two main types of modulating controls • Control Humidistat (Electric or Pneumatic) • Transducer/Sensor

  18. Controls Modulating Controls Components Sensor/Transducer (Duct/Wall) Controller Varying DEMAND SIGNAL to Humidifier OR Varying TRANSDUCER SIGNAL to Humidifier (NHTC, GSTC, SETC, MH)

  19. Controls Modulating Controls Transducer vs. Humidistat • Transducer • Signal representing the sensed humidity • Humidistat • Signal representing the demand Example: 0-10 Vdc Demand signal vs. Transducer Signal *Note: DO NOT MIX SIGNAL TYPES

  20. Controls Modulating Controls 0-10V Digital Wall Humidistat • Features • Accuracy of ± 3% • Outdoor temperature set back • No loss of set parameters when returning from power failure • Display • Sensed RH in the space • Set point • Outdoor temperature setback • Demand signal

  21. Controls Modulating Controls 0-10V Digital Duct Humidistat Package 0-10V Wall Humidistat without Sensor • Features • Accuracy of ± 3% • Outdoor temperature set back • No loss of set parameters when returning from power failure • Remote duct sensor • Display • Sensed RH in the space • Set point • Outdoor temperature setback • Demand signal + 2-10V Remote Duct Sensor

  22. Controls Modulating Controls Advantages • Accurate Control • Closer tolerance about set point • Longer unit runtime • Components Durability

  23. Controls Outdoor Temperature Setback Outdoor Temperature Sensors • Adjusts the set point to prevent condensation on windows and other surfaces adjacent to outside air • Compatible with all Nortec Digital On/Off and Modulating controls • Duct or Wall mounted (residential) Sensors

  24. Controls Outdoor Temperature Setback

  25. Controls Remote Fault Indication • Provides set of 4 status relays for remote monitoring of: • Unit power • Steam production • Maintenance/service • Unit fault • All relays can interface with BMS • Standard on GSTC, SETC, MHTC, and all Outdoor units • Optional on NHTC and NHRS

  26. 100% OA, Economizer, and VAV Systems Controls • On/Off Vs. Modulating High Limit • Humidification load varies with the outside air conditions • On/Off high limits work well as long as the OA is relatively stable and dry • Increase in RH of OA could lead to: • Wet duct • Short cycling of the humidifier • Modulating HL adjusts the output of the humidifier as required to maintain conditions in the duct

  27. Controls Control Systems by Humidifier

  28. Controls Nortec Controls

  29. Controls NHTC Low Voltage Terminal Strip

  30. Controls NHRS Series Control Circuit Terminal Strip NHRS: Dry Points, rated 24 Vac/dc 1.0 Amps max. resistive load per Indicator Other On/Off OPTIONAL REMOTE Devices STATUS PCB Optional High Limit Modulation Control K1 Steam Humidistat See Diagram included with unit for details K2 Error Air Proving K3 Service Switch K4 Unit ON Control Humidistat Optional external remote NOTE: If no On/Off 6 2 3 4 5 1 indication. Any or all of these Control is used, then remote indications can be A field jumper must utilized. Refer to Trouble be connected across Shooting Manual for system 1and 2 in order for status indication. humidifier to operate

  31. Controls GSTC Series Low Voltage Terminal Strip

  32. Controls SETC Series Low Voltage Terminal Strip

  33. 2 1 3 5 6 7 4 + - ~ Modulation Inputs 24 Vac ON/OFF Controls Controls AIRFOG Wiring

  34. Controls Obsolete NH Series Low Voltage Terminal Strip NHB, NHP, NHMC Remote Status (Yellow) Optional Modulation Control (NHP, NHMC,NHDI) NHMC Remote Status (Green) NHMC Remote Status (Red) ON / OFF Controls For blower pack connections only 8 10 32 30 28 26 61 20 62 40 63 36 81 82 83 84 85

  35. Controls NHTC/PC Remote Fault Option

  36. Field wire modulating controller (humidistat) so that signal decreases on RH rise EXTERNAL INTERNAL EXTERNAL EXTERNAL EXTERNAL INTERNAL INTERNAL INTERNAL Controls Controls by Others • Modulating Control (humidistat) to include: • RH Set point adjustment • Sensor circuit • Sensing element • Power source (independent of humidifier) • 2-wire varying vdc output signal Power to controller by others - + Optional on/off controls 2 wire varying vdc Output Signal by others (or jumper) NHP / NHMC 8 10 32 30 28 26 Airfog 1 2 4 3 GH 1 2 4 5 GS/SE/NH 1 2 3 4

  37. Controls Dual Controls by Others Signal Signal By Others By Others (SETC/GSTC/NHTC only) Channel 1 Channel 2 - - + + ON/Off Controls + + - EXTERNAL EXTERNAL 3 9 1 4 7 5 6 8 2 INTERNAL INTERNAL

  38. Controls Installation Location A X B C E X D F Air Proving Switch Duct High Limit Wall Humidistat Duct Humidistat A C E F

  39. Controls Installation Considerations • Possible sources of heat or cold • Sunlight • Exterior wall • Ventilation • Dead Zones • Sources of humidity • Sink • Inner wall draft

  40. Questions?

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