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Table of contents for the manual
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Page 1
GENERAL These completely assembled blower units are manufac- tured under ISO 9002 Quality System Certification and include a well-insulated cabinet, a DX cooling coil with copper tubes and aluminum fins, an expansion valve, a distributor , throwaway filters, a centrifugal blower , a blower motor , a blower motor contactor , an adjustable belt drive[...]
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Page 2
2 Unitary Products Group 550.39-N4YI T ABLE OF CONTENTS General ................................................................................ 1 Reference ............................................................................ 1 Inspection ............................................................................ 1 Nomenclature ...........[...]
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Page 3
carrier's agent should be made in writing. See Local Dis - tributor for additional information. LIMIT ATIONS These units must be installed in accordance with applicable na - tional, local and municipal safety codes. If components are to be added to a unit to meet local codes, they are to be installed at the dealer's and/or the customer&ap[...]
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Page 4
CLEARANCES The clearances listed on the unit dimension drawing (Figure 9) are required for the proper service and opera - tion of the unit. RIGGING AND HANDLING Be careful when moving the unit. Do not remove any packaging until the unit is near its final location. The packaging consists of a bottom wooden skid that can be lifted with a fork truck f[...]
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Page 5
REFRIGERANT MAINS Many service problems can be avoided by taking adequate pre- cautions to provide an internally clean and dry system, and by us- ing procedures and materials that conform with established standards. Hard drawn copper tubing should be used where no apprecia - ble amount of bending around pipes or other obstructions in necessary . Us[...]
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Page 6
Before brazing the refrigerant lines to these connections, remove the short panel from the unit frame and slide it (along with the grommets) onto the refrigerant lines. Af - ter the brazed joints have cooled, slide the panel back into place and secure it to the unit frame. NOTE: These units can only be piped from one side of the unit. EXP ANSION V [...]
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Page 7
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 inac - curate. T o assure a dry coil, the refrigerant system should be de-energized while the test is being run. 4. Knowi[...]
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Page 8
8 Unitary Products Group 550.39-N4YI KEU090 - SUPPL Y AIR BLOWER PERFORMANCE 1 - (CFM) BLOWER SPEED RPM AIRFLOW ESP 2 (IWG) OUTPUT (BHP) INPUT (kW) ESP 2 (IWG) OUTPUT (BHP) INPUT (KW) ESP2 (IWG) OUTPUT (BHP) INPUT (kW) ESP 2 (IWG) OUTPUT (BHP) INPUT (kW) ESP 2 (IWG) OUTPUT (BHP) INPUT (kW 2400 CFM 2700 CFM 3000 CFM 3300 CFM 3600CFM 600 0.35 0.62 0.[...]
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Page 9
Unitary Products Group 9 550.39-N4YI T ABLE 5 - ACCESSOR Y ST A TIC RESIST ANCE (IWG) ACCESSORY EXTERNAL ST A TIC PRESSURE DROP RESIST ANCE IWG/pA BLOWER CFM/m 3 /s 2400 / 1.1 2700 / 1.3 3000 / 1.4 3300 / 1.6 3600 / 1.7 Electric Heat 10k W 0.01 / 2.5 0.01 / 2.5 0.01/ 2.5 0.02 / 5.0 0.02/ 5.0 16 kW 0.01 / 2.5 0.02 / 5.0 0.02 / 5.0 0.03 / 7.4 0.04/ 1[...]
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Page 10
10 Unitary Products Group 550.39-N4YI FIG 9 - UNIT DIMENSIONS AND CLEARANCES Overall dimension of the unit will vary if an electric heater , a supply air plenum or a base is used. This dimension is required for removal of the DX coil. Only 26" is required for normal servicing. If the DX coil has to be removed, this dimension is required to loo[...]
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Page 11
Unitary Products Group 11 550.39-N4YI MOTOR SPECIFICA - TIONS •1450 RPM •380/415-3-50 •Solid base •56 Frame •Inherently protected Permanently lubricated ball bearings POWER AND CONTROL WIRING Install electrical wiring in accordance with applicable national, local and municipal codes. The unit should be grounded in ac - cordance with these[...]
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Page 12
Unitary Products Group P .O. Box 1592, Y ork, Pennsylvania USA 17405-1592 Subject to change without notice. Printed in U.S.A Copyright © by Y ork International Corporation 1994. All Rights Reserved. 550.39-N4YI MAINTENANCE FILTERS — The filters must be replaced as often as necessary to assure good air flow and filtering action. Refer to the unit[...]