Unit installation

inaccurate. To assure a dry coil, the refrigeration system
should be de-activated 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
Figure 11.
If the CFM is above or below the specified value, the supply
air motor pulley may have to be re-adjusted. After one hour
of operation, check the belt and pulleys for tightness and
alignment.
WARNING: Failure to properly adjust the total system air quan-
tity can result in extensive blower damage.
After readings have been obtained, remove the tubes and
seal up the drilled holes in the side panel 5/16" dot plugs
(P/N 029-13880) are available through normal parts ordering
procedures.
Unit Model Accessory
CFM
1600 1800 2000 2200 2400
060
Electric Heaters
10 KW 0.01 0.01 0.01 0.02 0.02
16 KW 0.01 0.02 0.02 0.03 0.04
26 KW 0.02 0.03 0.04 0.05 0.08
Supply Air Plenum 0.03 0.04 0.05 0.07 0.10
Return Air Grille 0.03 0.04 0.05 0.07 0.10
Hot Water Coil 0.16 0.21 0.24 0.28 0.32
Steam Coil 0.13 0.16 0.19 0.22 0.26
2400 2700 3000 3300 3600
090
Electric Heaters
10 KW 0.01 0.01 0.01 0.02 0.02
16 KW 0.01 0.02 0.02 0.03 0.04
26 KW 0.03 0.04 0.05 0.06 0.07
36 KW 0.05 0.07 0.08 0.10 0.11
Supply Air Plenum 0.03 0.03 0.04 0.05 0.06
Return Air Grille 0.02 0.03 0.04 0.05 0.06
Hot Water Coil 0.11 0.14 0.17 0.20 0.23
Steam Coil 0.10 0.12 0.14 0.16 0.19
3200 3600 4000 4400 4800
120
Electric Heaters
10 KW 0.02 0.02 0.03 0.03 0.04
16 KW 0.03 0.04 0.05 0.06 0.07
26 KW 0.06 0.07 0.09 0.11 0.13
36 KW 0.09 0.11 0.14 0.17 0.20
Supply Air Plenum 0.05 0.06 0.07 0.08 0.10
Return Air Grille 0.05 0.06 0.07 0.08 0.10
Hot Water Coil 0.19 0.24 0.30 0.35 0.40
Steam Coil 0.16 0.19 0.23 0.27 0.31
MODELS
MOTOR
HP
BLOWER
(RPM)
ADJUSTABLE
MOTOR PULLEY
FIXED
BLOWER PULLEY
BELTS
PITCH
DIA.
(IN.)
BORE
(IN.)
PITCH
DIA.
(IN.)
BORE
(IN.)
DESIG-
NATION
PITCH
LENGTH
(IN.)
060 3/4 810 - 1110 2.8 - 3.8 5/8 6.0 3/4 A32 33.3
090 1-1/2 655 - 880 2.8 - 3.8 7/8 7.5 1 A36 37.3
120 2 700 - 950 2.8 - 3.8 7/8 7.0 1 A36 37.3
NOTES: 1. All motors are 1750 RPM and have a 56 frame, inherent protection and permanently lubricated ball bearings. The 3/4 HP motor is split phase and has a resilient base and a 1.25
service factor. The 1-1/2 and 2 HP motors have a solid base and a 1.15 service factor.
2. Three-phase motors are be wired for a 460 volt power supply. Refer to the wiring diagram inside the motor terminal box when motor leads have to be reconnected for a
208 or 230 volt power supply.
TABLE 5
- STATIC RESISTANCES FOR UNIT ACCESSORIES (IWG)
TABLE 6
- BLOWER MOTOR AND DRIVE DATA
550.23-N2Y
Unitary Products Group 9