5567611-BIM-B-1218
56
Johnson Controls Ducted Systems
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.
Checking air quantity
Method one
1.
Remove the dot plugs from the duct panel.
2.
Insert eight-inches of 1/4 inch metal tubing into the airflow
on both sides of the indoor coil.
Note:
You must insert the tubes and hold them in a position
perpendicular to the air flow so that velocity pressure
does not affect the static pressure readings.
3.
Use an inclined manometer or Magnehelic® to determine
the pressure drop across a dry evaporator coil. The
moisture on an evaporator coil can vary greatly, measuring
the pressure drop across a wet coil under field conditions
could be inaccurate. To ensure that the coil is dry, de-
activate the compressors de-activated while the test is
being run.
Note:
De-energize the compressors before you take any test
measurements to ensure that the evaporator coil is dry.
Table 21: RPM selection
Size
(tons)
Model Airflow option
HP
Max
BHP
Motor
sheave
Blower
sheave
6 turns
open
5 turns
open
4 turns
open
3 turns
open
2 turns
open
1 turn
open
Fully
closed
-06
(6.5)
ZV
Standard
1.5
1.725
1VL40
AK74
N/A
663
713
759
803
840
882
High static
2
2.3
1VM50
AK74
N/A
884
927
977
1025
1074
1121
-07
(7.5)
ZV
Standard
1.5
1.725
1VL40
AK69
N/A
714
761
799
852
905
955
High static
3
3.45
1VM50
AK69
N/A
952
1002
1043
1104
1140
1202
-08
(8.5)
ZV
Standard
2
2.3
1VM50
AK89
N/A
737
775
812
851
889
926
High static
3
3.45
1VM50
AK74
N/A
903
943
985
1028
1071
1113
-10
(10)
ZV
Standard
2
2.3
1VM50
AK84
N/A
781
819
859
897
932
969
High static
3
3.45
1VM50
AK74
N/A
903
943
985
1028
1076
1113
-12
(12.5)
ZV
Standard
3
3.45
1VM50
AK74
N/A
908
955
1003
1049
1094
1142
High static
5
5.75
1VP56
BK77
1104
1102
1157
1200
1246
1282
1328
Table 22: Indoor blower specifications
Size
(tons)
Model
Motor
Motor sheave
Blower sheave
Belt
HP
RPM
Eff.
SF
Frame
Datum dia.
(in.)
Bore (in.) Model
Datum dia.
(in.)
Bore (in.) Model
-06
(6.5)
ZV
Standard
1-1/2
1725
0.8
1.15
56
2.6 - 3.6
7/8
1VL40
7.0
1
AK74
High static
2
1725
0.8
1.15
56
3.6 - 4.6
7/8
1VM50
6.0
1
AK74
-07
(7.5)
ZV
Standard
1-1/2
1725
0.8
1.15
56
2.6 - 3.6
7/8
1VL40
7.0
1
AK69
High static
3
1725
0.8
1.15
56
3.6 - 4.6
7/8
1VM50
5.7
1
AK69
-08
(8.5)
ZV
Standard
2
1725
0.8
1.15
56
3.4 - 4.4
7/8
1VM50
9.0
1
AK89
High static
3
1725
0.8
1.15
56
3.4 - 4.4
7/8
1VM50
7.0
1
AK74
-10
(10)
ZV
Standard
2
1725
0.8
1.15
56
3.4 - 4.4
7/8
1VM50
8.0
1
AK84
High static
3
1725
0.8
1.15
56
3.4 - 4.4
7/8
1VM50
7.0
1
AK74
-12
(12.5)
ZV
Standard
3
1725
0.8
1.15
56
3.4 - 4.4
7/8
1VM50
7.0
1
AK74
High static
5
1725
0.87
1.15
184T
4.3 - 5.3
1-1/8
1VP56
6.7
1
BK77
Table 23: Power exhaust specifications
Model
Voltage
Motor
Unit (per circuit)
Fuse size
CFM @ 0.1 ESP
HP
RPM
1
1. Motors are multi-tapped and factory wired for high speed.
QTY
LRA
FLA
MCA
2PE04704706
208/230-1-60
3/4
1075
1
24.9
5
6.3
10
4800
2PE04704746
460-1-60
3/4
1075
1
N/A
2.2
2.8
5
4800
2PE04704758
575-1-60
3/4
1050
1
N/A
1.5
1.9
4
4800
You must adjust the belt drive blower systems to the
specific static and CFM requirements for the application.
The belt drive blowers are not set at the factory for any
specific static or CFM. You must adjust the blower speed
and belt tension.
Verify proper sheave alignment. Tighten the blower
pulley and motor sheave set screws after these
adjustments. Re-check the set screws after 10-12 hours
of run time.
