Carrier NP034-074 specifications Gas Manifold Pressure 48 Series Units Only

If oil charge is above sight glass, do not remove any oil until the compressor crankcase heater has been on for at least 24 hours. When additional oil or a complete charge is needed, use only Carrier-approved compressor oil.

Approved oils:

Texaco, Inc	Capella WF-32
Shrieve Chemical Co	Zerol 150 (Synthetic)
Witco Co	Suniso 3GS

Do not reuse drained oil and do not use any oil that has been exposed to the atmosphere.

Gas Manifold Pressure (48 Series Units Only)

ÐCheck pressure to ensure it matches the pressure stamped on the valve body. See Gas Valve Adjustment section on page 50 for more details.

Unit Voltage Ð Be sure power source agrees with the unit nameplate rating.

Leak Test and Dehydration Ð Be sure there are no refrigerant leaks. All units are shipped with a complete op- erating charge of R-22 (Tables 1A and 1B) and should be under sufficient pressure for leak testing after installation. If there is no system pressure, add refrigerant until a pressure is observed and then check for leaks. After leaks are re- paired, remove and recover refrigerant from the system. For leak testing procedures, see Carrier Standard Service Tech- niques, Refrigerants section. Do not use the system com- pressors to remove refrigerant from the system.

Evaporator-Fan Belts, Pulleys, and Sheaves Ð

Belts, pulleys, and sheaves are factory installed. All pulleys are nonadjustable.

See Tables 1A and 1B for fan shaft center distance ranges and shaft sizes when making selections for ®eld-supplied drives. See Tables 9A and 9B for a complete listing of ®eld- supplied pulleys and belt connections.

Check the lubrication of fan and motor bearings. Bearings are shipped full of grease for corrosion protection and may run warm temporarily on start-up until the excess grease has discharged. Check bearing setscrews for tightness. Also check the tightness of the setscrews on the fan wheel and on the fan and motor sheaves. Check fan shaft bearing mountings for tightness.

Recheck sheave alignment and belt tension. See Adjust- ments section on page 46 for instructions.

Hand-turn the fan to make sure the fan wheel does not rub on the fan housing. The fan shaft and motor shaft must be free wheeling before power is applied to the unit.

Following the necessary electrical checks, check for fan vibration. If excessive vibration occurs, check for:

·drive misalignment

·mismatched belts

·wheel or sheaves loose on shaft

·loose bearings

·loose mounting bolts

·motor out of balance

·sheaves eccentric or out of balance

·wheel out of balance (replace if necessary)

Table 9A Ð Field-Supplied Evaporator-Fan Pulley Data, 034,044 Units

IFM	IFM		MOTOR PULLEY					BLOWER PULLEY				BELTS
Hp	RPM	No.		Type	Size (in.)		No.		Type	Size (in.)	Quantity	Type	Size (in.)
		Grooves					Grooves
	435					3.4
	500					3.9							61.8
71¤2	590	2		BK		4.6	2		B5V	13.6	2	BX
	650					5.1
	720					5.6							64.8
	820					6.4
	500			BK		3.9	2		B5V	13.6	2	BX	61.8
	550					4.3
10	575	2				4.5							63.0
	650			B5V		5.1	2		B5V	13.7	2	5VX
	730					5.7
	830					6.5							66.0
	550					4.3
	625					4.9
15	675	2		B5V		5.3	2		B5V	13.7	2	5VX	63.0
	730					5.7
	800					6.3
	880					6.7							66.0
	575					4.5
	625					4.9
20	700	2		B5V		5.5	2		B5V	13.7	2	5VX	63.0
	750					5.5
	830					6.5
	880					6.9							66.0
IFM Ð	Indoor (Evaporator) Fan Motor

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