Carrier 48HJ015-025 installation instructions Start-Up

Fig. 22 Ð Outdoor-Air Hood Details

START-UP

Use the following information and Start-Up Checklist on page CL-1 to check out unit PRIOR to start-up.

Unit Preparation Ð Check that unit has been installed in accordance with these installation instructions and appli- cable codes.

Compressor Mounting Ð Loosen the compressor hold- down bolts until sidewise movement of the washer under each holddown bolt head can be obtained. Do not loosen completely as bolts are self-locking and will maintain adjustment.

Internal Wiring Ð Check all electrical connections in unit control boxes; tighten as required.

Refrigerant Service Ports and Valves Ð Each 48HJ unit has 2 Schrader-type service ports per circuit; one on the suction line and one on the liquid line. Be sure that the caps on the ports are tight. The units also have 2 service valves per circuit; one on the suction line and one on the discharge line. Be sure all valves are open.

Crankcase Heater Ð Crankcase heater is energized as long as there is power to the unit.

IMPORTANT: Unit power must be on for 24 hours prior to start-up. Otherwise, damage to compressor may result.

Evaporator Fan Ð Fan belt and pulleys are factory in- stalled. See Tables 3A, 3B, 4, and 5 for Fan Performance Data. Remove tape from fan pulley and adjust pulleys on 48HJ015 units as required. See Evaporator-Fan Perfor- mance Adjustment section on page 19. Be sure that fans ro- tate in the proper direction. See Table 6 for air quantity lim- its. See Table 7 for static pressure drops for accessories and options. See Fig. 23 and 24 for fan performance using hori- zontal adapter and power exhaust. To alter fan performance, see Performance Adjustment sections on page 19.

Condenser-Fans and Motors Ð Condenser fans and motors are factory set. Refer to Condenser-Fan Adjustment section on page 20 as required. Be sure that fans rotate in the proper direction.

Return-Air Filters Ð Check that correct ®lters are in- stalled in ®lter tracks (see Table 1). Do not operate unit with- out return-air ®lters.

Outdoor-Air Inlet Screens Ð Outdoor-air inlet screens must be in place before operating unit.

Accessory Field-Installed Economizer Adjust-

ment Ð Remove ®lter access panel. Check that outdoor- air damper is closed and return-air damper is open.

Economizer operation and adjustment are described in Base Unit Operation section on page 17; and Economizer Adjustment section on page 20.

NOTES:

1.Dimensions are in millimeters.

2.The 50DP900211 high static regain adapter accessory may be used to provide horizontal supply/return.

NOTE: The 50DP900211 horizontal supply/return adapter accessory improves 48HJ fan performance by increasing external static pres- sure by amount shown above.

Fig. 23 Ð Horizontal Supply/Return Fan Performance

With 50DP900211 High Static Regain Adapter

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