Agenda Controls Controls Overview OnOff Controls Modulating Controls Accessories amp Controls Configuration 2 19092022 Controls Overview 19092022 3 Controls Overview Humidification control requires two types of devices ID: 1009386
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1. Ashutosh Upadhyaya Controls
2. AgendaControlsControls OverviewOn/Off ControlsModulating ControlsAccessories & Controls Configuration219.09.2022
3. Controls Overview19.09.20223
4. Controls OverviewHumidification control requires two types of devices: Controls Overview 419.09.2022Safety Devices – Monitors conditions in duct to prevent saturation conditionsAir proving deviceHigh limit humidistatRoom Control Devices – Control of humidifiersOn/off control humidistatModulating control humidistatTransducerWired to safety loop Wired to control loopBoth the safety loop and the control loop must be closed in order for the humidifier to run.
5. Safety DevicesThe following two devices should always be present when using a ducted humidifier:Controls Overview19.09.20225Air Proving DeviceEnsures there is airflow in the ductMounted upstream to the humidifier/distributorHigh Limit HumidistatMonitors humidity level in supply ductHigh limit setpoint is typically 85%Mounted upstream, 3x absorption distance
6. Safety Devices: Air Proving DevicesControls Overview19.09.20226DescriptionPart NumberAir Proving SwitchAPS-NARange: 0.08 – 1.206 in. H2O (20 – 300 Pa) Differential: 0.4 in. H2O (0.1 mBar) Temp. range: -22 – 185°F (-30 – 85°C) Accuracy: ~0.04” WC ±15 % Industrial/Commercial duct application Switch-point scale in inch water column For use with: DL, ME, RS, EL, GS, SE 2599903Electric Air Flow MonitorCDA & CDA-SMeasuring range: 20 – 5905 fpm (0.1 – 30 m/s)Temperature range: 32 – 176°F (0 – 80°C) Probe length: 5.5“/140 mm (CDA), 4.33”/110 mm (CDA-S)Industrial/Commercial duct application (CDA)Private end user duct application (CDA-S)Applicable where pressure difference (APS) is not sensitive enough For use with: CDA: DL, ME, RS, EL, GS, SE CDA-S: RH, RE25998952599896
7. Room Control DevicesThe room control devices will be wired to the humidifier’s control loop.It is typically mounted in the room or return duct.On/off HumidistatModulating HumidistatSensor TransducerControls Overview19.09.20227
8. Room Control Devices: On/Off HumidistatControl device compares sensed humidity to setpoint.If the humidity in space is..Below setpoint: humidifier turns on at 100% capacityAbove setpoint: humidifier turns offApplications:Small Units (ex. 5 lbs)When tight humidity tolerance is not necessaryControls Overview19.09.20228
9. Room Control Devices: Modulating HumidistatDevice compares sensed humidity to setpointSends varying demand signal from 0 - 100%Ramp up/ramp down rather than constant on/offAdvantages:Smoother outputReduces short cyclingTighter humidity controlControls Overview19.09.20229
10. Room Control Devices: Sensor/TransducerDoes not have internal control logicDevice transmits sensed humidity level (raw data)Humidifier, BMS system, or wall-mounted humidistat applies control logicAdvantages:Smoother outputReduces short cyclingTighter humidity controlControls Overview19.09.202210
11. Device LocationDucted humidifiers typically use three control devices:Controls Overview19.09.202211ABCDACBWall-mountedDuct-mountedAir Proving SwitchSenses presence of air flow in ductRoom Control DeviceSenses humidity in room (or return duct) to be compared with setpoint (~40-60% RH)High-Limit Protection DeviceSenses humidity in duct to be compared with high-limit setpoint (~85%)D
12. On/Off Controls19.09.202212
13. Principle of OperationOn/Off Controls19.09.202213Note: Set point in middle of dead bandABTime (t)% RHSet PointDead BandHumidity drops to point B – Humidifier turns onHumidity reaches point A – Humidifier turns offThe space between A and B is the dead band455550
14. Wall Mounted Humidistat - CHR-NADescription:Accuracy: ±4.5 % rHSupply: 24 V AC/DCOutput 1: On/Off Relay (Humidity)Output 2: Fan EnableFeatures:PI control output for humidifierOutdoor temperature input for set-back mode3” display with backlightCapacitive sensing elementExcellent reliability and long-term stabilityOn/Off Controls19.09.202214
15. Duct Mounted Humidistat - CHD-NADescription:Accuracy: ±4.5 % RHSupply: 24 V AC/DCOutput 1: On/Off Relay (Humidity)Output 2: Fan EnableFeatures:PI control outputOutdoor temperature set-backDisplay with backlightCapacitive sensing elementFan control relayOn/Off Controls19.09.202215
16. Fan Relay TimingOn/Off Controls19.09.202216Call for humidity – Fan relay closes and fan turns on10 second delay – Humidifier relay closes and unit begins to humidifyHumidity demand satisfied – Humidifier relay opens and unit stops humidifying90 second delay – Fan relay opens and fan turns off
17. Humidity Controller with external duct sensor – DCC-NADescription:Accuracy: ±2.5 % rHSupply: 24 V AC/DCOutput: 0 – 10 V DC DemandFeatures:PID control output for humidifierOutdoor temperature input for set-back mode3” display with backlightCapacitive sensing elementExcellent reliability and long-term stabilityOn/Off Controls19.09.202217On/Off Wall Humidistat without SensorRemote Duct Sensor
18. Mechanical Humidistat – MHR Description:Accuracy: ±3 % RHRange: 25 – 95% RHOutput: On/OffFeatures:No power supply neededSuitable for high humidity levelIP 30 ratingHumidification and dehumidificationOn/Off Controls19.09.202218
19. WiringOn/Off Controls19.09.202219
20. Modulating Controls19.09.202220
21. Principle of OperationModulating Controls19.09.202221Humidity is below point B – unit is on 100%Humidity rises above set point – unit ramps downHumidity drops below set point – unit ramps upThe space between A & B is the proportional band
22. Principle of Operation – P, PI, PID ControlProportional 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.Modulating Controls19.09.202222
23. Principle of Operation – P, PI, PID ControlModulating Controls19.09.202223Proportional Control Stabilization
24. Principle of Operation – P, PI, PID ControlProportional Plus Integral Controller (P-I)The integral function looks at the accumulated offset over time and adjust the output of the controller as required to eliminate it.Modulating Controls19.09.202224
25. Principle of Operation – P, PI, PID ControlProportional 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 adjust the output of the controller to minimize it.Modulating Controls19.09.202225
26. OverviewTwo main types of modulating controls:Control HumidistatControl logic has already been appliedSignal represents required outputSensor/TransducerControl logic has not been appliedSignal represents humidity level of roomModulating Controls19.09.202226
27. Humidistat vs. Sensor/TransducerModulating Controls19.09.202227Transducer100% RH50% S.P.Assume Room is at 100% RHAssume Setpoint on Humidifier = 50% RHTransducer/sensor installed (0-10v output)Question: What voltage does the transducer output?Answer: 10 volts DC
28. Humidistat vs. Sensor/TransducerModulating Controls19.09.202228100% RH50% S.P.Assume Room is at 100% RHAssume Setpoint on Humidistat = 50% RHHumidistat installed (0-10v output)Question: What voltage does the Humidistat output?Answer: 0 volts DCHumidistat
29. Humidistat vs. Sensor/TransducerHumidistatSensor/TransducerSignal to Humidifier RepresentsDemandSensed HumidityDemand is Calculated ByHumidistatHumidifierExamplesSet point = 60% RHRoom RH = 60% RHSignal to humidifierHumidifier understands0 V“0% Demand”No requirement of humidity 6 V“RH in room = 60%”Humidifier calculates demand = 0%Set point = 60% RHRoom RH = 20% RHSignal to humidifierHumidifier understands4V“40% Demand”2V“RH in room RH = 20%”Humidifier calculates demand = 40%Modulating Controls19.09.202229Note: Take care with selecting the correct signal type!
30. 0-10V Digital Wall Humidistat – RCC-NADescription:Accuracy: ±2.5 % rHSupply: 24V AC/DCOutput: 0…10 VFeatures:PI control output for humidifierOutdoor temperature input for set-back mode3” display with backlightCapacitive sensing elementExcellent reliability and long-term stabilityModulating Controls19.09.202230
31. 0-10V Digital Duct Humidistat Package – DCC-NADescription:Accuracy: ±2.5 % rHSupply: 24V AC/DCOutput: 0…10 VProbe length: 157mm (6.2”)Features:PI control output for humidifierOutdoor temperature input for set-back mode3” display with backlightCapacitive sensing elementExcellent reliability and long-term stabilityModulating Controls19.09.2022310-10V Wall Humidistat without sensor+2-10V Remote Duct Sensor
32. Duct Mounted Sensor – CDC-NA/CDC-SLDescription: Accuracy: ±2.5 % RH (±4.5 % for SL) Supply: 24 V AC/DCOutput: 2 – 10 VDC (Sensed RH)Probe length: 157 mm (6.2”)Features:Sensed RH OutputCapacitive sensing elementExcellent reliability and long-term stabilityEasy installationShort probe version (SL) for residential projectsModulating Controls19.09.202232
33. Wall Mounted SensorDescription: Accuracy: ±2.5 % rHSupply: 24 V AC/DCOutput: 2 – 10 VDC (Sensed RH)Location: Wall MountFeatures:Outdoor temperature input for set-back mode3” display with backlightCapacitive sensing elementExcellent reliability and long-term stabilityModulating Controls19.09.202233
34. Single vs. Dual ChannelModulating Controls34Single ChannelOne device wired to modulation loop Transducer/Sensor OR HumidistatOn/Off High-Limit Humidistat Air proving switch Dual ChannelTwo devices wired to modulation loop – integrated controller must consider both.Transducer/Sensor OR HumidistatOn/Off High-Limit HumidistatModulating High-Limit Humidistat Air proving switch 19.09.2022
35. On/Off vs. Modulating High LimitModulating Controls35Humidification load varies with outside air conditions.On/off high limit: Useful when OA is relatively stable and dryIncrease in RH of OA could lead to wet duct or short cycling of the humidifierModulating high limit:Ideal for fluctuating outdoor conditions100% OA, Economizer & VAV Systems Adjusts the output of the humidifier as required to maintain conditions in the duct19.09.2022
36. Single-Channel Modulating ControlModulating Controls36Modulating duct-mounted humidistatOn/off high-limit humidistatAir proving deviceDuct-mounted sensorOn/off high-limit humidistatAir proving deviceModulating wall-mounted humidistatDuct-mounted sensorOn/off high-limit humidistatAir proving device1Modulating wall-mounted humidistatOn/off high-limit humidistatAir proving device32419.09.2022
37. Dual-Channel Modulating ControlModulating Controls37Modulating duct-mounted humidistatOn/off high-limit humidistatModulating high-limit humidistatAir proving deviceDuct-mounted sensorOn/off high-limit humidistatModulating high-limit humidistatAir proving deviceModulating wall-mounted humidistatOn/off high-limit humidistatDuct-mounted sensorModulating high-limit humidistatAir proving device1Modulating wall-mounted humidistatOn/off high-limit HumidistatModulating high-limit humidistatAir proving device32419.09.2022
38. Single Channel Modulation: Example ConfigurationModulating Controls3819.09.2022
39. Dual Channel Modulation: Example ConfigurationModulating Controls3919.09.2022
40. Advantages of modulating controls over on/offModulation Controls40Increased control accuracyMinimizes humidity swingsLonger unit runtimeReduced likelihood of short cycles19.09.2022
41. High Precision Control: Humidity & Temperature TransmitterProbe: +/- 0.5% RH and +/- 0.1 KWorking Temperature: 32 – 122F (0-50C)Options Probe (customer can use their own) 5m cable to line Probe/CoreConfiguration via Windows PCFor use with DL, RS, EL, GS and DASpecial Controls: High Precision Package19.09.202241
42. Avoid placing humidistats near:Installation Considerations42Possible sources of heat or coldSunlightExterior wallVentilationDead ZonesSources of humiditySinkInner wall draft19.09.2022
43. Accessories & Controls Configuration4319.09.2022
44. Outdoor Temperature SetbackControls Configuration44Adjusts set point to prevent condensation on windows and other surfaces adjacent to outside airCompatible with all Condair Digital On/Off and Modulating controlsDuct or Wall mounted (residential) SensorsDuct MountOutdoor Mount19.09.2022
45. Remote Fault IndicationControls Configuration45Provides set of 4 status relays (dry contacts) for remote monitoring of:Unit powerSteam productionMaintenance/serviceUnit faultStandard on GS, DL, SETC, and all Outdoor unitsOptional on EL, RS, and MENot available for LS, TE, RH2, MES2, US19.09.2022
46. Building AutomationControl Configuration46Allow systems to “talk” to each other over a network.BACnet IPBACnet MSTPModbusLonWorksBAS – Building Automation SystemBMS – Building Management SystemSame thing! Building owners & operators sometimes view BAS as a subset of BMS, with focus on HVAC and lighting controls.19.09.2022
47. BACnet IP BACnet MS/TPBuilding AutomationControls Configuration47Internet ProtocolMaster-Slave Token PassingEach device wired to BMS via ethernet cableBMS can interact with multiple devices at once1000x faster than BACnet MS/TPEasiest ConfigurationOne main cable connected to every device on the network“Token” is used to relay and exchange information Only one device can have the token at any given time Hardest Configuration19.09.2022
48. Integrated ControllerControls Configuration48Integrated Controller FeaturesBMS integrationIntegrated Proportional (P) and Proportional Integral (PI) control logicInstant access to settings and current performanceUSB port for downloading performance dataFault reports can be exported as CSV and shared with technical services On-screen troubleshooting Available on: GS, RS, EL, DL, ME, RO-A19.09.2022
49. Integrated Controller: BTL Certified BACnetControls Configuration49When is a BTL card required?When BTL Certification is specified in the bid document.BACnet IP and MS/TP are both native to the Condair integrated control board. BTL card eliminates any risk of communication issues between BMS/Integrated Controller.19.09.2022
50. Integrated ControllerControls Configuration50IP portEthernet CableBACnet IPModbusOnboard RS485Twisted-Pair CableBACnet MSTP ModbusAdd-On CardOptionalBTL Certified BACnet IPBTL Certified BACnet MSTPLonworks19.09.2022
51. Integrated Controller: BTL Certified BACnetControls Configuration51BTL: BACnet Testing LaboratoriesBACnet technology certified by accredited BTL testing laboratory Tested according to worldwide BACnet communications standardsAdd-on card attaches directly to Integrated ControllerFactory install or field retrofit available19.09.2022
52. Staged Modulation “Link-Up”Controls Configuration52 Also known as Multi Mode Split one signal among many units Humidifiers behave as one large unit Units can be connected in parallel or in series True redundancy requires BMS MasterUnit 2Unit 3Units 4-1019.09.2022
53. Sample InstallationSubheadline19.09.202253
54. Example: On/Off HumidistatSample Installation19.09.202254
55. Example: Modulating HumidistatSample Installation19.09.202255
56. SummaryKey Takeaways56Ducted humidifiers should always have an air proving device, high-limit safety device, and a control device. Typically used for small units, or when tight humidity tolerance is not required. More precise control, deal for most applications.Humidistat signal represents demand, transducer signal represents sensed humidity.BTL add-on card is typically only required if specified in the bid document.Controls OverviewOn/Off ControlsModulating ControlsControls Configuration19.09.2022
57. ashutosh.upadhyaya@condair.comAshutosh Upadhyaya57