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TrueSTEAM ™ Humidification Systems

Understand industry standards for sizing, calculate home humidity load requirements, and analyze different types of humidifiers. Key learning for choosing the ideal humidifier based on load requirements.

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TrueSTEAM ™ Humidification Systems

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  1. TrueSTEAM™ Humidification Systems Module 2: TrueSTEAM Sizing and Selection

  2. Module 2: Selecting & Sizing • Understanding Industry Standards & Guidelines for sizing • Calculating a home's humidity load requirements • Trade-offs of different humidifier types Key Learning Selecting the Right Humidifier for Every Job

  3. *Based on a tight home with people living in it. Sizing – Establishing a Baseline • AHRI sets rating guidelines for humidifiers. (610 Guideline F) • Definitions • Capacity rating = Maximum output in 24-hour period • Load requirement = Minimum output required to achieve 35%RH with external variables considered. • Traditionally, ratings advertised based on capacity • A better approachBase humidifier selection on LOAD REQUIREMENT to minimize excessive runtime, operating costs, and dealer callbacks.

  4. Sizing – Refining the message • Assume fixed value 35%RH and hours needed to achieve. • Segmented by area size, average daily run times. • A bypass humidifier is rated at 12 GPD - Why not use this? • 12 GPD based on 120F air passing through it • In a 2000 sq ft space, equals 13 hours of furnace run time • Furnace runtime more $$$ than TrueSTEAM in this example.

  5. Sizing – TrueSTEAM Recommendations • HM506: 500-1800 for <80% daily run (<20 hr) • HM509: 1000-2300 for <80% daily run (<20 hr) • HM512: 1500-3000 for <80% daily run (<20 hr) • Within these home sizes, units should hit ideal humidity without running all day. • Why do some of the numbers overlap? • Variables within home affect these average run rates.

  6. Variables within the home that affect humidity • Insulation • Tight, average or loose? • Ceiling height • Higher ceilings = smaller ft2 coverable (larger total volume) • Indoor temperature • Higher temps require higher RH% to achieve desired comfort • Control settings • Ventilation – What sources of ventilation are there? • Fireplace flues • ERV/HRV/motorized dampers • Open windows • Old homes breathe more

  7. Square footage Insulation – AHRI definition of structure type • 'Tight' = Well insulated with vapor retarders, tight storm doors, windows with weather stripping, dampered fireplace and using 1/2 air changes per hour for ventilation. • 'Average' = Insulated with vapor retarders, loose storm doors and windows, dampered fireplace with 1 air change per hour for ventilation. • 'Loose' = Generally built before 1930 with little or no insulation, no storm doors, no insulated windows, no weather stripping, no vapor retarders, undampered fireplace. Uses 1-1/2 air changes per hour for ventilation. • How does this translate to load requirements?

  8. 1000 ft2 @8-ft ceiling 1250 ft2 @8-ft ceiling 1500 ft2 @8-ft ceiling 3000 ft2 @8-ft ceiling 2000 ft2 @8-ft ceiling 2500 ft2 @8-ft ceiling Ceiling height • AHRI sets load requirements for a fixed 8-ft ceiling height • Higher ceilings, open foyers, split level, stairway air shafts add to total CUBIC feet • Higher height = Lower width/length served (i.e. lower ft2) • If ceiling height >8ft, refer to ft3, not ft2. • Multiplying ft2 by ceiling height equals ft3 • How does this translate to load requirements?

  9. Frost Protection • Auto-humidity controls reduce and increase indoor humidity based on outdoor conditions. • What Honeywell Frost Protect reads… Frost setting limits achievable humidity.

  10. 1000 ft2 @8-ft ceiling 1250 ft2 @8-ft ceiling 1500 ft2 @8-ft ceiling 3000 ft2 @8-ft ceiling 2000 ft2 @8-ft ceiling 2500 ft2 @8-ft ceiling Ventilation • Ventilation sources • Fireplaces • If fireplace present, ensure flue is kept shut when not in use • Forced air ventilators • HRVs and motorized dampers exhaust humidity • Open windows • Drier outside air infiltrates home, exhausts humidified air • Old homes breathe more • Pre-1985 buildings can be assumed to be ‘Average’ or ‘Loose’ insulation, unless retrofitted after. • How does this translate to load requirements?

  11. Recommendations on Humidity with Ventilation • Educate homeowner on proper fireplace upkeep. • Ventilators – Recommend Energy Recovery style which retain moisture in home. • Shut and lock windows. • If average or loose fitting, upsize humidifier, or install multiple units if greater than 12 GPD is required.

  12. Support Materials • Detailed Training Materials on Sizing Available! • Visit www.forwardthinking.honeywell.com • Click on Humidification • Enter literature form:#50-1098: Proper Sizing#50-1066:Selecting a Humidifier

  13. Recap • Understanding Industry Standards & Guidelines for sizing • Calculating a home's humidity load requirements • Trade-offs of different humidifier types Key Learning Selecting the Right Humidifier for Every Job

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