York ZR SERIES Specifications download pdf (Page 41)

567040-YIM-B-1210

Johnson Controls Unitary Products 41

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 30. In order to obtain an accurate measurement, be

certain that the air filters are clean.

5. To adjust Measured CFM to Required CFM, see SUPPLY

AIR DRIVE ADJUSTMENT.

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.

Method Two

1. Drill two 5/16 inch holes, one in the return air duct as close

to the inlet of the unit as possible, and another in the supply

air duct as close to the outlet of the unit as possible.

2. Using the whole drilled in step 1, insert eight inches of 1/4

inch metal tubing into the airflow of the return and supply

air ducts of the unit.

Table 19: 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

078

(6.5)

1-1/2 1725 0.8 1.15 56 3.4 - 4.4 7/8 1VM50 7.0 1 AK74 A49

2 1725 0.8 1.15 56 3.4 - 4.4 7/8 1VM50 6.0 1 AK64 A49

090

(7.5)

1-1/2 1725 0.8 1.15 56 3.4 - 4.4 7/8 1VM50 7.0 1 AK74 A49

3 1725 0.8 1.15 56 3.4 - 4.4 7/8 1VM50 5.7 1 AK61 A49

102

(8.5)

2 1725 0.8 1.15 56 3.4 - 4.4 7/8 1VM50 8.5 1 AK89 A56

3 1725 0.8 1.15 56 3.4 - 4.4 7/8 1VM50 7.0 1 AK74 A54

120

(10)

2 1725 0.8 1.15 56 3.4 - 4.4 7/8 1VM50 8.0 1 AK84 A56

3 1725 0.8 1.15 56 3.4 - 4.4 7/8 1VM50 7.0 1 AK74 A54

150

(12.5)

3 1725 0.8 1.15 56 3.4 - 4.4 7/8 1VM50 7.0 1 AK74 A54

5 1725 0.87 1.15 184T 4.3 - 5.3 1-1/8 1VP56 6.7 1 BK77 BX55

Table 20: Power Exhaust Specifications

Model Voltage

Motor Motor

Fuse Size

CFM @

0.1 ESP

HP RPM

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

. Tighten blower pulley

and motor sheave set screws after these adjustments.

Re-checking set screws after 10-12 hrs. run time is

recommended.

Failure to properly adjust the total system air quantity

can result in extensive blower damage.

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