VENTILATION OR AIR CYCLING (CONTINUED)
FIGURE 21 – Ventilation Wiring
90-1537
A+BDEH
REMOTEHVAC EQUIP
VENT
Cf
Gs Gh
DHRf
DAMPERS
R
C
W
YY
W
G
C
R
G
SENSOR
ODT
FLOAT
SWITCH
DEHUMIDIFIER
CONTROL BOARD
24 VAC
(10 VA min)
TRANSFORMER
THERMOSTAT HVAC EQUIPMENT
OPTIONAL OUTDOOR
TEMPERATURE SENSOR
6" NORMALLY
CLOSED DAMPER
FUNCTIONS IN
AIR CYCLING
MODE IF
DAMPER NOT
INSTALLED
DETERMINE VENTILATION REQUIREMENTS
See page 17 for outdoor
temperature sensor installation.
1. The MINIMUM ventilation requirement is calculated using
ASHRAE 62.2.
ASHRAE Airflow in CFM = [House Area in Sq. Ft. x 0.01]
+ [(Number of Bedrooms +1) x 7.5]
Notes: Use ‘Number of Bedrooms +1’ or the ‘Number of
Occupants’, whichever is larger.
2. Table 3 shows calculated airflow values to the nearest 5 CFM.
3. Record the Required CFM. __________
CALCULATING AIRFLOW REQUIREMENT
TABLE 3 – CFM Required
House Sq. Ft.
Number of Bedrooms
2 3 4 5 6
1000
35 40 50
1500
40 45 55 60 70
2000
45 50 60 65 75
2500
50 55 65 70 80
3000
55 60 70 75 85
3500
75 80 90
15
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