1133391-YIM-A-1014
42
Johnson Controls Unitary Products
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 (for location of
the dot plugs see Figures 12 and 13).
2.
Insert eight-inches of 1/4 inch metal tubing into the airflow
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.
Use an Inclined Manometer or Magnehelic to determine
the pressure drop across a dry evaporator coil. Since the
moisture on an evaporator coil can vary greatly, measuring
the pressure drop across a wet coil under field conditions
could be inaccurate. To assure a dry coil, the compressors
should be de-activated while the test is being run.
NOTE:
De-energize the compressors before taking any test
measurements to assure a dry evaporator coil.
4.
The CFM through the unit can be determined from the
pressure drop indicated by the manometer by referring to
Figure 28. In order to obtain an accurate measurement, be
certain that the air filters are clean.
5.
To adjust Measured CFM to Required CFM, see.
6.
After readings have been obtained, remove the tubes and
replace the dot plugs.
7.
Tighten blower pulley and motor sheave set screws after
any adjustments. Re-check set screws after 10-12 hrs. run
time is recommended.
Table 18: 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
037
(3.0)
ZR
Std.
1.5
1.5
1VP34
AK61
N/A
575
636
696
757
817
878
H. Static
1.5
1.5
1VL44
AK59
N/A
878
941
1004
1066
1129
1192
049
(4.0)
ZR
Std.
1.5
1.5
1VP34
AK61
N/A
575
636
696
757
817
878
H. Static
1.5
1.5
1VL44
AK59
N/A
878
941
1004
1066
1129
1192
061
(5.0)
ZR
Std.
1.5
1.5
1VP34
AK61
N/A
575
636
696
757
817
878
H. Static\
2
2
1VL44
AK59
N/A
878
941
1004
1066
1129
1192
Table 19: Indoor Blower Specifications
Size
(Tons)
Model
Motor
Motor Sheave
Blower Sheave
Belt
Airflow
Option
HP
RPM
Eff.
SF
Frame
Datum Dia.
(in.)
Bore (in.) Model
Datum Dia.
(in.)
Bore (in.) Model
037
ZR
Std.
1-1/2
1725
0.8
1.15
56
1.2 - 2.9
7/8
1VP34
5.7
1
AK61
A47
(3)
H. Static
1-1/2
1725
0.8
1.15
56
3.0 - 4.0
7/8
1VL44
5.5
1
AK59
A47
049
ZR
Std.
1-1/2
1725
0.8
1.15
56
1.2 - 2.9
7/8
1VP34
5.7
1
AK61
A47
(4)
H. Static
1-1/2
1725
0.8
1.15
56
3.0 - 4.0
7/8
1VL44
5.5
1
AK59
A47
061
ZR
Std.
1-1/2
1725
0.8
1.15
56
1.2 - 2.9
7/8
1VP34
5.7
1
AK61
A47
(5)
H. Static
2
1725
0.8
1.15
56
3.0 - 4.0
7/8
1VL44
5.5
1
AK59
A47
Table 20: Power Exhaust Specifications
Model
Voltage
Motor
Motor
Fuse Size
CFM @
0.1 ESP
HP
RPM
1
1. Motors are multi-tapped and factory wired for high speed.
QTY
LRA
FLA
MCA
2PE04703225
208/230-1-60
3/4
1075
1
7.8
5
6.3
10
3800
2PE04703246
460-1-60
3/4
1075
1
3.4
2.2
2.8
5
3800
2PE04703258
575-1-60
3/4
1050
1
2.9
1.5
1.9
4
3800
Belt drive blower systems MUST be adjusted 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. Adjustments of the blower speed
and belt tension are REQUIRED. Verify proper sheave
alignment; tighten blower pulley and motor sheave set
screws after these adjustments. Re-checking set screws
after 10-12 hrs. run time is recommended.
