Healthy Home System™
Residential Ventilation
Part 1
Whole House Air Quality
WWW. FIELDCONTROLS.COM
1
Introduction
A. Field Controls HHS Demo
B. Introduction
C. FAS Fresh Air System
D. Determining the ventilation
o ASHRAE 62.2
o Intermittent Ventilation
E.
F.
G.
H.
3
Equivalent Feet
Static Pressure
Sizing & Selecting the Damper
Ventilation timing adjustments
Introduction
Healthy Homes
3
Introduction
What, How, When of Ventilation
4
Introduction
Cabin Ventilation & Filtration
5
Introduction
Air Conditioning Car Filters
6
Introduction
Vacuum Cleaner Filter
7
Introduction
INDOOR AIR QUALITY
In today’s health conscious society, all of us take great interest
in the quality of food and water we eat and drink.
In fact:
• We eat approximately 2 – 3 lbs of food a day
• We drink approximately 3 – 4 pounds of water a day
What about the air we breath?
How much air do we breath in a day?
8 8
Asthma and Allergy Foundation
9
FAST FACTS
Asthma and Allergy Foundation
Every Day in AMERICA!
• 44,000 people have an asthma attack
• 36,000 kids miss school due to asthma
• 27,000 adults miss work due to asthma
• 4,700 people visit the emergency room due to asthma
• 1,200 people are admitted to the hospital due to asthma
•
9 people die from asthma
10
FAST FACTS
• Droppings or body parts of cockroaches and other pests can trigger asthma
• Proteins are found in cockroach feces and saliva that can cause allergic reactions
• Cockroach allergens likely play a significant role in asthma in many urban areas
11
FAST FACTS
12
FAST FACTS
13
Clothes Dryer Inefficiency
95O F
Air
70O
Condition Air to
70O F
Hot
Wall
125O
Heat
F air to
F, circulate
to remove moisture, and then
exhaust
Drye
r
12,000
CF Air
All the air in a 1,500
square foot home is
exhausted out over a 60
minute cycle
Clothes Dryer Inefficiency
Hot Humid
Air
Condition Air to
70O F
Hot
Wall
A home is depressurized from exhaust
devices. Clothes dryer, bath fan, kitchen
exhaust, attic fan, central vacuum, single
pipe fan assisted furnace, boiler or water
heater, supply & return duct leakage etc…
Air will enter randomly any way it can!
Drye
r
12,000
CF Air
Chimney’s can back draft from
insufficient combustion and/or
makeup air. Toxins can enter
from sumps, attached garages,
basements and crawl spaces.
CONTROL
Healthy Home System™
When combined with other Healthy Home System™
components, the control delivers year round air quality - even
when not heating or cooling.
16
FRESH
Whole House Ventilation
17
Introduction
FRESH Solution
Whole House Ventilation
•
Manages Fresh Air ventilation and/or makeup air
•
Utilizes Central Fan Integrated Ventilation CFIV
•
Programmable electromechanical power opened power closed fresh air damper solution
•
Improves air quality by diluting indoor air with fresh outdoor air
•
Lowers indoor concentration of contaminants developing a Healthy Home
1818
CONTROL
Wiring the Healthy Home System Controller
19
FRESH
Benefits of the Fresh Air System (FAS-1)
Supplies fresh air to the home from a known source and in a known quantity.
•
•
Exhaust systems pull air in from any available source, including undesirable locations such as a garage, attic or crawl
space that could have a potentially negative impact on air quality.
Exhaust systems may have little effect on indoor air quality if pull air from leakage sites close to the fan, effectively
sending the fresh air right back out the exhaust.
Periodically re-circulates air within the entire home.
•
•
Improves comfort by mixing air to de-stratify and balance temperature and humidity throughout the home.
Improves Indoor Air Quality year-round by reducing contaminates when a whole house filtration and/or UV
treatment system is present. Whole house filtration and UV treatment can only occur when the central fan operates.
Evenly distributes the fresh air throughout home.
•
Because the system is ducted into the central system and works in concert with the central fan, the fresh air is
properly distributed throughout the whole house.
Cost effective ventilation
•
•
•
The FAS-1 takes advantage of normal operating frequency of the central heating and cooling system .
FAS-1 installation cost is low and the payback to the homeowner is greatly reduced versus an HRV.
Depending on the region, the FAS-1 operating cost can range from $20/year in cold climates to $80/year in warm
climates.
Does not contribute to depressurization like an exhaust fan does.
•
Depressurization can be a safety concern when atmospherically fired appliances are in use in the home.
Does not over-pressurize a home like a supply fan could.
•
During intake of fresh air, temporary slight pressurization of the home can occur, however the system does not
operate continuously so once operation ceases the pressure quickly rebalances through natural ex-filtration.
20
FRESH
•
•
•
•
The FAS-1 is a central fan integrated ventilation (CFIV) system.
Automatically delivers cost effective, quality ventilation year-round.
Provides dilution air and air changes which are critical to improved air quality.
Delivers fresh air from a known location and quality source.
Exhaust fans do not control source of the replacement air… can pull contaminated air
from garage, attic, or crawl space.
• Meets ASHRAE 62.2 ventilation standard.
• Circulating air year-round enhances effectiveness of whole house filtration and air
purification.
+
=
21
FRESH
FAD - FRESH AIR DAMPER CONSTRUCTION
One Motor Assembly
Fits all sizes 4,6,8,10
Service Switch
Flat Shaft Indicates
Damper Position
Cotter Pinned
Washer Shaft Seal
3 Pre Punched
Mounting Holes
Stainless Steel
Plug in 3 wire Harness
Red - R White - C Blue - V
Mounting Screws (2)
Robust Metal Motor
Support Bracket
Pre Crimped Pipe Edge
Direction of Flow
Tight Rubber Seal
Brass Bearing Surface
Long Life Motor Assembly
Power Open – Power Closed
24 VAC / 3 Watt / 80 Milli-Amps
22
FRESH
ASHRAE 62.2 Whole House Constant Flow Ventilation Requirements
New & Existing Homes: 7.5 CFM per Bedroom + 1 & 1 CFM per 100 sq. ft.
Note: (+ 1 figures 2 people in the master bedroom)
Occupants
sq. ft.
1000
1500
2000
2500
3000
3500
2
1 Bed.
3
2 Bed.
4
3 Bed.
5
4 Bed.
6
5 Bed.
25
30
35
40
45
50
32.5
37.5
42.5
47.5
52.5
57.5
40
45
50
55
60
65
47.5
52.5
57.5
62.5
67.5
72.5
55
60
65
70
75
80
23
FRESH
How many CFM are required for ventilation?
ASHRAE 62.2
Need to know!
• Square feet of conditioned floor space includes basement
• 1 CFM per 100 sq. ft. of conditioned floor space
• Number of bedrooms
• 7.5 CFM per Bedroom + 1
• Plus 1 ASHRAE figures 2 people for the master bedroom
24
FRESH
How many CFM are required for ventilation?
ASHRAE 62.2
Example:
• 1500 square foot home
• 2 bedrooms
• Engineer system for full CFM delivery
• Adjustments can be made by modifying the HHSC program
• Over sized - add a manual damper for adjustment
25
FRESH
How many CFM are required for ventilation?
ASHRAE 62.2
Step 1
1500 square foot conditioned floor space
x .01 sq. ft home multiplier (1 CFM per 100 sq. ft.)
15
CFM (cubic feet per minute)
Step 2
7.5
x2
15
+ 7.5
22.5
CFM per bedroom Plus 1 or 7.5 CFM per occupant if known
Bedrooms
CFM
CFM Plus (1) Figures 2 people in master bedroom
CFM
Step 3
15 CFM Step 1
+ 22.5 CFM Step 2
37.5 CFM Constant 24/7
26
FRESH
FRESH AIR SIZING
•
37.5 CFM Constant Ventilation (1500 sq ft 2 bedroom home)
•
37.5 CFM X 3 = 112.5 CFM (1 hour) 60 minutes ÷ 3 = 20 minutes
•
HHS Control regulates volume controlling damper & appliance fan
•
Two cycles per hour Fresh Air Damper open 10 minutes per ½ hour
27
FRESH
FRESH AIR SIZING
•
Two cycles per hour Fresh Air Damper open 10 minutes per ½ hour
•
112.5 CFM for 20 minutes same as 37.5 CFM per hour constant
•
Size Fresh Air System for ventilation to deliver 112.5 CFM
•
Combustion and makeup air are handled separately
28
FRESH
IMPORTANT
• Intake Air Hood Size metal not plastic ¼ hardware cloth
• Intake Pipe Size
• Intake Pipe Length
• Recommend Smooth Sheet Metal Pipe
•
Intake to return air plenum duct connection location
29
FRESH
Calculate equivalent feet of intake air pipe
1.
Determine total equivalent feet by each type of fitting used in
connecting the outside intake air hood to the return air duct
plenum. See reference table below.
2.
Determine total equivalent feet for lengths of straight pipe
3.
Equivalent feet of fittings plus equivalent feet of straight pipe
equals total equivalent
30
FRESH
EXAMPLE:
Outside Intake Air Pipe Size 6 inch
Step 1
2 - 90° Elbows (6 inch) = 22 equivalent feet
Step 2
2 - 5 Ft. lengths of 6 inch pipe = 10 equivalent feet
(Smooth straight pipe 1 foot = 1 equivalent foot)
Step 3
Step 1
+
Step 2
=
Step 3
22 equiv. ft. + 10 equiv. ft. = 32 Total equivalent feet
31
FRESH
FRESH AIR SYSTEM SIZING
• Total equivalent feet, intake air pipe size, intake air hood size,
damper size and return air static pressure determines CFM Intake
 Required CFM delivery 112.5 CFM Intermittent(37.5 CFM Constant)
 Total Equivalent Feet
32 Equivalent Feet
• What’s the return air static pressure at duct to air intake connection?
• What’s the design (negative) Return Air Plenum Static Pressure?
• What size pipe, intake hood & damper to deliver 112.5 CFM?
32
FRESH
Determine Return Air Static Pressure
1. Turn the room thermostat to constant fan on or AC is operating.
2. Make sure a clean appliance filter is installed
A plugged air filter will change the static pressure measurement
3. Use a Magnethelic gauge, monometer air flow measurement tool
Instruments must be calibrated to zero for accurate measurements
4. Take a measurement in the return air plenum where fresh air intake
will be installed. Fresh air intake already installed and attached to
intake air hood and return air plenum. Take the negative static
pressure measurement with fan on or AC operating and damper
open. Static pressure measurement should be taken in return air
plenum near center of intake air pipe.
Note: Operate HVAC appliance fan on high speed
33
FRESH
Determine Return Air Static Pressure
5.
Record the measurement or take a
few measurements and average
6.
Static pressure measurement will
now determine Fresh Air Damper size
7. What’s the static pressure? Example: .1 inches WC is common
8. Total equivalent feet, required / delivered CFM ventilation and
negative return air static pressure will determine duct size for
intake air hood, connecting pipe and fresh air damper.
9.
For best results connect intake air at return air plenum
10. Make sure air is filtered before entering the appliance fan
34
Determining Static Pressure
Installation Information
35
Determining Static Pressure
Installation Information
36
Determining Static Pressure
Installation Information
37
FRESH
FAD 4 - AIR FLOW SIZING
CHARTS
38
FRESH
FAD - 6 AIR FLOW SIZING
39
FRESH
FAD - 8 AIR FLOW SIZING
40
FRESH
FAD - 10 AIR FLOW SIZING
41
FRESH
42
FRESH
Deliver 112.5 CFM Intermittent
FC Products
• FAS-1 Fresh Air System
o HHSC - Health Home System Control
o FAD - Fresh Air Damper (6 inch)
• IAH 6 inch Intake Air Hood
o Intake air hood purchased separately
+
HHSC
=
FAD
Whole House FAS
43
FRESH
Product Information
• HHSC Healthy Home System Control
•
•
•
•
FAD – 4
FAD – 6
FAD – 8
FAD – 10
• IAH
4 inch Fresh Air Damper
6 inch Fresh Air Damper
8 inch Fresh Air Damper
10 inch Fresh Air Damper
Intake Air Hood
+
HHSC
=
FAD
Whole House FAS
44