Carrier NP034-074 Installation, Start-up And Service Instructions Manual

Contents

Carrier NP034-074 Installation, Start-up And Service Instructions Manual Manual pdf 38 page image

PRE-START-UPUnit Preparation — Check to see that unit has beeninstalled in accordance with these Installation Instructionsand all applicable codes.Compressor Mounting — Loosen compressor hold-down bolts until sidewise movement of the washer undereach holddown bolt head can be obtained. Do not loosencompletely, as bolts are self-locking and will maintainadjustment.Evaporator-Fan Shipping Brackets — Evapor-ator-fan shipping brackets (4 per unit) must be removed fromeach corner of the fan sled before starting unit.UNIT SIZES 034 AND 0441. To remove brackets, raise fan sled by turning adjustingbolt counterclockwise until spring is compressed slightly.2. Remove screws holding shipping bracket to unit cross rail.3. Remove shipping bracket (top of bracket is slotted so thatit will slide out).4. After removing all shipping brackets, level fan sled usingthe adjusting screws. On all 4 corners, dimension fromcross rail to fan sled should be as shown in Fig. 30.UNIT SIZES 054-074 — To remove shipping brackets, re-move the 6 screws holding each bracket to the cross rail.There are 8 brackets per unit. See Fig. 30 or 31.After removing all shipping brackets, level fan sled usingthe adjusting screws. On all 4 corners dimension from crossrail to fan sled should be as shown in Fig. 30 or 31.Internal Wiring — Check all electrical connections inthe unit control box; tighten as required.Refrigerant Service Valves — All units have aSchrader-type service port on both suction lines. Be sure thatcaps on the ports are tight. All units have discharge and suc-tion service valves on each compressor and a service valveon each liquid line. Be sure the valves are open before start-ing unit.Crankcase Heaters — The crankcase heaters must befirmly locked into the compressors. The crankcase heatersare energized when there is power to the unit. Crankcaseheaters must be energized with discharge and suction serv-ice valves open for at least 24 hours prior to unit start-up inorder to remove liquid refrigerant from the compressor crank-case and to prevent oil foaming.Compressor Oil — Check that compressor oil is vis-ible in the sight glass of the compressor. All units are factorycharged with oil. See Table 8. Observe oil level closely atstart-up. If oil level is below the sight glass and cannot beseen, add oil until the level is approximately 1/4 of sightglass. See Carrier Standard Service Techniques, Refriger-ants section, for procedures to add or remove oil.Table 8 — Oil ChargeUNIT SIZE OIL CHARGE (pints)034 16 ( 8 each circuit)044 28 (14 each circuit)054 33 (19 ckt 1, 14 ckt 2)064 38 (19 each circuit)074 38 (19 each circuit)Fig. 30 — Shipping Brackets; 034,044 Units and50 Series Vertical Discharge 054-074 UnitsFig. 31 — Shipping Brackets; 48 Series 054-074 Unitsand 50 Series Horizontal Discharge 054-074 Units38