York W)036 THRU 060 Specifications download pdf (Page 41)

542300-YIM-A-1009

Johnson Controls Unitary Products 41

Checking Supply Air CFM

The RPM of the supply air blower will depend on the required

CFM, the unit accessories or options and the static resistances

of both the supply and the return air duct systems. With this

information, the motor speed tap (direct drive) or the motor

pulley number of turns open (belt drive) can be determined from

the Blower Performance Data Tables.

Note the following:

1. The supply air CFM must be within the limitations shown in

the Unit Physical Data Table 8.

2. Pulleys can be adjusted in half turn increments.

3. The tension on the belt should be adjusted as shown in the

Belt Adjustment Figure 19.

4. Tighten blower pulley and motor sheave set screws after

any adjustments. Re-check set screws after 10-12 hrs run

time is recommended.

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.

To check the supply air CFM after the initial balancing has been

completed:

1. Remove the two 5/16” dot plugs from the blower motor and

the filter access panels shown in Figure 8.

2. Insert at least 8" of 1/4 inch tubing into each of these holes

for sufficient penetration into the air flow 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. Using an inclined manometer, determine the pressure drop

across a dry evaporator coil. Since the moisture on an

evaporator coil may vary greatly, measuring the pressure

drop across a wet coil under field conditions would be

inaccurate. To assure a dry coil, the compressors should

be deactivated while the test is being run.

4. Knowing the pressure drop across a dry coil, the actual

CFM through the unit can be determined from the curve in

Pressure Drop vs. Supply Air CFM (Figure 21).

After readings have been obtained, remove the tubes and

reinstall the two 5/16” dot plugs that were removed in Step 1.

NOTE: De-energize the compressors before taking any test

measurements to assure a dry indoor coil.

Figure 21: Pressure Drop Across Coil

Table 16: Indoor Blower Specifications (Belt Drive)

Size

(Tons)

Motor Motor Sheave Blower Sheave

Belt

HP RPM Eff. SF Frame

Datum Dia.

(in.)

Bore (in.) Model

Datum Dia.

(in.)

Bore (in.) Model

036

(3.0)

1-1/2 1725 0.8 1.15 56 2.8 - 3.8 7/8 1VL44 6.0 1 AK64 A37

1-1/2 1725 0.8 1.15 56 4.0 - 5.0 7/8 1VP56 6.2 1 AK66 A39

048

(4.0)

1-1/2 1725 0.8 1.15 56 2.8 - 3.8 7/8 1VL44 5.2 1 AK56 A36

1-1/2 1725 0.8 1.15 56 4.0 - 5.0 7/8 1VP56 5.7 1 AK61 A38

060

(5.0)

1-1/2 1725 0.8 1.15 56 2.8 - 3.8 7/8 1VL44 5.2 1 AK56 A36

2 1725 0.8 1.15 56 4.0 - 5.0 7/8 1VP56 5.2 1 AK56 A38

Table 17: 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

2PE04703025 208/230-1-60 1/2 1725 1 23.7 4.4 5.5 8 1350

2PE04703046 460-1-60 1/2 1725 1 4.1 1.7 2.1 5 1350

Failure to properly adjust the total system air quantity and

static pressure can result in extensive system damage.

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

0 500 1000 1500 2000 2500 3000 3500

NOMINAL CFM

PRESSURE DROP (IWG)

036

048

060

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 57 58

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York W)036 THRU 060 Specifications Page 41

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