TrueSTEAM

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
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 35RH 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 35RH 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 lt80 daily run (lt20 hr)
• HM509 1000-2300 for lt80 daily run (lt20 hr)
• HM512 1500-3000 for lt80 daily run (lt20 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
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
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 gt8ft, 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
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 form50-1098 Proper
  Sizing50-1066Selecting 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