173858-YIM-A-0306
8
Unitary Products Group
CHECKING SUPPLY AIR CFM
To check the supply air CFM after the initial balancing has
been completed:
1.
Remove the two ¼ inch dot plugs in the duct panel.
2.
Insert at least 8 inches of ¼ inch tubing into each of
these holes for sufficient penetration into the airflow on
both sides of the indoor coil.
3.
Using an inclined manometer, determine the pressure
drop across the evaporator coil.
4.
Knowing the pressure drop across the coil, the actual
CFM through the unit can be determined from Table 5.
After readings have been obtained, remove the tubes and
reinstall the two ¼ inch plugs removed in Step 1.
TABLE 4: ELECTRICAL DATA
SIZE
(TONS)
MODEL
POWER
COMPRESSOR
(EACH)
OD FAN
MOTORS
(EACH)
SUPPLY
BLOWER
MOTOR
MCA
1
(AMPS)
MOCP
2
(AMPS)
MAX. FUSE
3
SIZE
(AMPS)
RLA
LRA
MCC
036
(3.0)
DEB
380/415-3-50
6.7
39.0
9.5
1.0
1.8
11.2
15
15
048
(4.0)
DEB
380/415-3-50
8.7
66.5
12.5
1.0
3.2
15.1
20
20
060
(5.0)
DEB
380/415-3-50
10.4
73.0
13.0
1.0
2.7
15.7
25
25
1.
Minimum Circuit Ampacity.
2.
Maximum Over Current Protection per standard UL 1995.
3.
Fuse or HACR circuit breaker size installed at factory or field installed.
Failure to properly adjust the total system air quan-
tity can result in extensive system damage.
