Aprilaire 1750A Installation Instructions Manual page 15

VENTIlATION OR AIR CyClING
fIGURE 21 – Ventilation Wiring
6" NORMALLY
CLOSED DAMPER
TRANSFORMER
FUNCTIONS IN
THERMOSTAT
AIR CYCLING
MODE IF
R
DAMPER NOT
C
INSTALLED
G
W
Y
OPTIONAL OUTDOOR
TEMPERATURE SENSOR
See page 17 for outdoor
temperature sensor installation.
DETERMINE VENTIlATION REQUIREMENTS
CAlCUlATING AIRflOW REQUIREMENT
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 . __________
(CONTINUED)
24 VAC
(10 VA min)
DEHUMIDIFIER
CONTROL BOARD
HVAC EQUIPMENT
R
C
G
W
Y
90-1537
TAblE 3 – CfM Required
House Sq. ft.
2
1000 35
1500 40
2000 45
2500 50
3000
55
3500
Number of bedrooms
3 4 5
40 50
45 55 60 70
50 60 65 75
55 65 70 80
60 70 75 85
75 80 90
6
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