Air Balance; Rpm Selection; Indoor Blower Specifications; Power Exhaust Specifications - York XP SERIES W/SIMPLICITY Installation Manual

5168273-YIM-A-1115
Table 13: RPM Selection
Size
Model HP
(Tons)
180 5
XP
(15) 7.5
240 7.5
XP
(20) 10
Table 14: Indoor Blower Specifications
Size
Model
(Tons)
HP
5
180
XP
(15)
7.5
7.5
240
XP
(20)
10
Table 15: Power Exhaust Specifications
Voltage
HP
208/230-1-60 3/4
460-1-60 3/4
575-1-60 3/4
1. Motors are multi-tapped and factory wired for high speed.

Air Balance

Start the supply air blower motor. Adjust the resistances in both
the supply and the return air duct systems to balance the air
distribution throughout the conditioned space. The job
specifications may require that this balancing be done by
someone other than the equipment installer.
To check the supply air CFM after the initial balancing has been
completed:
1. Remove the two 5/16" dot plugs from the blower motor and
the filter access panels shown in the Unit Dimensions Front
View (Figures 7 and 8) and Unit Dimensions Rear View
(Figure 9), respectively.
2. Insert at least 8" of 1/4 inch tubing into each of these holes
for sufficient penetration into the air flow on both sides of
the indoor coil.
NOTE: The tubes must be inserted and held in a position
perpendicular to the air flow so that velocity pressure
will not affect the static pressure readings.
3. Using an inclined manometer, determine the pressure drop
across a dry evaporator coil. Since the moisture on an
evaporator coil may vary greatly, measuring the pressure
drop across a wet coil under field conditions would be
inaccurate. To assure a dry coil, the compressors should
be deactivated while the test is being run.
After readings have been obtained, remove the tubes and
34
Motor Blower 6 Turns
Sheave Sheave Open
1VP60 BK120 700
1VP60 BK100 845
1VP60 BK110 765
1VP60 BK090 930
Motor
Frame Datum Dia.
RPM Eff. SF
1750 0.895 1.15 184T
1750 0.91 1.15 213T
1750 0.91 1.15 213T
1760 0.895 1.15 215T
Motor
1
RPM QTY LRA
1075 1 7.7
1075 1 4.1
1050 1 2.84
5 Turns 4 Turns 3 Turns
Open Open Open
730 760
885 925
800 835
970 1010
Motor Sheave
Bore (in) Model
4.5 - 5.7 1-1/8 1VP60
4.5 - 5.7 1-3/8 1VP60
4.5 - 5.7 1-3/8 1VP60
4.5 - 5.7 1-3/8 1VP60
Motor
FLA MCA
5.0 6.25
2.2 2.75
1.5 1.875
Pressure Drop Across a Dry Coil vs Supply Air CFM
0.60
0.50
0.40
0.30
0.20
0.10
0.00
3000 4000
Figure 19: Pressure Drop Across A Dry Indoor Coil Vs.
Supply Air CFM For All Unit Tonnages
4. Knowing the pressure drop across a dry coil, the actual
CFM through the unit can be determined from the curve in
Pressure Drop vs. Supply Air CFM Figure 19.
Failure to properly adjust the total system air quantity
can result in extensive blower damage.
reinstall the two 5/16" dot plugs that were removed in Step 1.
2 Turns 1 Turns
Open Open
790 820 850
960 1000 1035
870 900 935
1050 1090 1130
Blower Sheave
Datum Dia.
Bore (in)
11.4 1-3/16
9.4 1-3/16
10.4 1-3/16
8.4 1-3/16
CFM @
0.1 ESP
5250
5250
5250
XP180
5000 6000 7000 8000
Nominal Air Flow (CFM)
Johnson Controls Unitary Products
Fully
Closed
880
1070
965
1170
Belt
Model
BK120 BX81
BK100 BX78
BK110 BX78
BK090 BX75
XP240
9000 10000