Air Balance; Checking Air Quantity; Rpm Selection; Indoor Blower Specifications - York Predator ZR series Installaton Manual

5167540-YIM-H-0518
Table 19: RPM Selection
Size Airflow
Model
(Tons) Option
037 Std.
ZR
(3.0)
H. Static
049 Std.
ZR
(4.0)
H. Static
Std.
061
ZR
(5.0)
H. Static\
Table 20: Indoor Blower Specifications
Size
Model
Airflow
(Tons)
Option
037
Std.
ZR
(3)
H. Static
049
Std.
ZR
(4)
H. Static
061
Std.
ZR
(5)
H. Static
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 Figures 12 and 13).
42
Max Motor
HP
BHP Sheave
1.5 1.5 1VP34
1.5 1.5 1VL44
1.5 1.5 1VP34
1.5 1.5 1VL44
1.5 1.5 1VP34
2 2 1VL44
Motor
HP RPM Eff. SF
1-1/2 1725 0.8 1.15
1-1/2 1725 0.8 1.15
1-1/2 1725 0.8 1.15
1-1/2 1725 0.8 1.15
1-1/2 1725 0.8 1.15
2 1725 0.8 1.15
Motor
1
HP RPM
3/4 1075
3/4 1075
3/4 1050
Blower 6 Turns 5 Turns
Sheave Open Open
AK61 N/A 575
AK59 N/A 878
AK61 N/A 575
AK59 N/A 878
AK61 N/A 575
AK59 N/A 878
Motor Sheave
Datum Dia.
Frame Bore (in.)
(in.)
56 1.2 - 2.9 7/8
56 3.0 - 4.0 7/8
56 1.2 - 2.9 7/8
56 3.0 - 4.0 7/8
56 1.2 - 2.9 7/8
56 3.0 - 4.0 7/8
Unit (Per Circuit)
QTY 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.
4 Turns 3 Turns 2 Turns
Open Open Open
636 696 757
941 1004 1066
636 696 757
941 1004 1066
636 696 757
941 1004 1066
Blower Sheave
Datum Dia.
Model Bore (in.)
(in.)
1VP34 5.7 1
1VL44 5.5 1
1VP34 5.7 1
1VL44 5.5 1
1VP34 5.7 1
1VL44 5.5 1
Fuse Size
MCA
6.3 10
2.8 5
1.9 4
Johnson Controls Ducted Systems
1 Turn Fully
Open Closed
817 878
1129 1192
817 878
1129 1192
817 878
1129 1192
Belt
Model
AK61 A47
AK59 A47
AK61 A47
AK59 A47
AK61 A47
AK59 A47
CFM @
0.1 ESP
4800
4800
4800