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5167534-YIM-G-0518
Table 19: RPM Selection
Size
Model
HP
(Tons)
1.5
037
ZH
(3)
1.5
1.5
049
ZH
(4)
1.5
1.5
061
ZH
(5)
2
Table 20: Indoor Blower Specifications
Size
Model
(Tons)
HP
037
1-1/2
ZH
(3)
1-1/2
1-1/2
049
ZH
(4)
1-1/2
1-1/2
061
ZH
(5)
2
Table 21: Power Exhaust Specifications
Model
Voltage
2PE04704706
208/230-1-60
2PE04704746
460-1-60
2PE04704758
575-1-60
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.
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.
Checking Air Quantity
Method One
1.
Remove the dot plugs from the duct panel (for location of
the dot plugs see Figure 12).
42
Max
Motor
Blower
BHP
Sheave
Sheave
1.5
1VM34
AK69
1.5
1VL44
AK69
1.5
1VM34
AK56
1.5
1VL44
AK56
1.5
1VL40
AK61
2
1VP56
AK74
Motor
RPM
Eff.
SF
Frame
1725
0.8
1.15
1725
0.8
1.15
1725
0.8
1.15
1725
0.8
1.15
1725
0.8
1.15
1725
0.8
1.15
Motor
1
HP
RPM
QTY
3/4
1075
3/4
1075
3/4
1050
6 Turns
5 Turns
4 Turns
Open
Open
N/A
531
N/A
796
N/A
663
N/A
995
N/A
787
N/A
1035
Motor Sheave
Datum Dia.
Bore (in.)
(in.)
56
2.0 - 3.0
7/8
56
3.0 - 4.0
7/8
56
2.0 - 3.0
7/8
56
3.0 - 4.0
7/8
56
2.6 - 3.6
7/8
56
4.2 - 5.2
7/8
Unit (Per Circuit)
LRA
FLA
1
24.9
5
1
N/A
2.2
1
N/A
1.5
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.
3 Turns
2 Turns
Open
Open
Open
584
637
690
849
902
955
730
796
863
1062
1128
1194
847
908
968
1084
1134
1183
Blower Sheave
Datum Dia.
Model
Bore (in.)
(in.)
1VM34
6.5
1
1VL44
6.5
1
1VM34
5.2
1
1VL44
5.2
1
1VL40
5.7
1
1VP56
7.0
1
Fuse Size
MCA
6.3
10
2.8
5
1.9
4
Johnson Controls Ducted Systems
1 Turn
Fully
Open
Closed
743
796
1008
1062
929
995
1261
1327
1029
1089
1232
1281
Belt
Model
AK69
A47
AK69
A47
AK56
A47
AK56
A47
AK61
A47
AK74
A51
CFM @
0.1 ESP
4800
4800
4800
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