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Carrier NP034-074 Ð Disconnect Location, 054-074Units, Series Horizontal Discharge Shown

Models: NP034-074

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Fig. 17 Ð Disconnect Location, 054-074 Units

Use care when drilling into corner post to avoid damage to con- denser coil.

Fig. 17 Ð Disconnect Location, 054-074 Units

(50 Series Horizontal Discharge Shown)

POWER WIRING Ð Units are factory wired for the voltage shown on the unit nameplate. The main terminal block is suitable for use with aluminum or copper wires. Maximum wire size is 3/0 AWG (American Wire Gage).

Use the following formula to determine the percent voltage imbalance.

% Voltage Imbalance

= 100 x	max voltage deviation from average voltage

When installing units, provide a disconnect per NEC (National Electrical Code) of adequate size (MOCP [Maxi- mum Overcurrent Protection] of unit is on the informative plate). All ®eld wiring must comply with NEC and all local codes. Size wire based on MCA (Minimum Circuit Amps) on the unit informative plate. See Fig. 18 for power wiring connections to the unit power terminal block and equipment ground.

Operating voltage to the compressor must be within the voltage range indicated on the unit nameplate. Voltages be- tween phases must be balanced within 2%, and the current must be balanced within 10%. See Tables 3-7 for unit elec- trical data.

	LEGEND
EQUIP	Ð Equipment
GND	Ð Ground
NEC	Ð National Electrical Code
TB	Ð Terminal Block

Fig. 18 Ð Field Power Wiring Connections

average voltage

Example: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v


	Average Voltage =	452 1 464 1 455
			3

	=	1371
		3

	= 457

Determine maximum deviation from average voltage:

(AB) 457 ± 452 = 5 v (BC) 464 ± 457 = 7 v (AC) 457 ± 455 = 2 v

Maximum deviation is 7 v.

Determine percent voltage imbalance:

	% Voltage Imbalance = 100 x	7
		457
	= 1.53%

This amount of phase imbalance is satisfactory as it is be- low the maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact local utility immediately.

Unit failure as a result of operation on improper line volt- age or excessive phase imbalance constitutes abuse and may cause damage to electrical components.

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Carrier NP034-074 Ð Disconnect Location, 054-074Units, Series Horizontal Discharge Shown, Ð Field Power Wiring Connections

Contents

Gas Manifold Pressure 48 Series CONTENTSInstalling Flue/Inlet Hoods 48 Series Units Evaporator-FanBelts, Pulleys, and Sheaves . .INSTALLATION CONTENTS contSAFETY CONSIDERATIONS GENERALFig. 1 Ð Rigging Label Table 1A Ð Physical Data; 034, 044 Units Table 1B Ð Physical Data; 054-074Units To attach ductwork to roof curb, insert duct approxi- mately 10 to 11 in. up into roof curb. Connect ductwork to 14-gageroof curb material with sheet metal screws driven from inside of the duct Fig. 3A Ð Roof Curb; 034, 044 Units Fig. 3B Ð Roof Curb; 054-074Units UNIT Install Outdoor Hoods Outdoor-AirInlet AdjustmentsUNIT 5400 8700 UNIT Fig. 6 Ð Condensate Drain Location Fig. 5 Ð Drain Location SelectionFig. 8 Ð Condensate Drain Piping Details Fig. 9 Ð Outdoor-AirHoodFig. 12 Ð Enthalpy Sensor Location Fig. 10 Ð Outdoor-AirDamper AdjustmentsFig. 13 Ð Psychrometric Chart for Inside of Hood ShownPosition Setting Adjustments Field Wire RoutingFig. 14 Ð Wiring Connections for Solid-State Field Electrical ConnectionsFig. 18 Ð Field Power Wiring Connections Fig. 17 Ð Disconnect Location, 054-074Units50 Series Horizontal Discharge Shown Table 3 Ð Electrical Data, 034 Units 208/230-3-60 V-Ph-HzTable 3 Ð Electrical Data, 034 Units cont 460-3-60 V-Ph-HzTable 3 Ð Electrical Data, 034 Units cont 575-3-60 V-Ph-HzTable 4 Ð Electrical Data, 044 Units Table 4 Ð Electrical Data, 044 Units cont Table 4 Ð Electrical Data, 044 Units cont BASE UNIT WITHTable 5 Ð Electrical Data, 054 Units Table 5 Ð Electrical Data, 054 Units cont Table 5 Ð Electrical Data, 054 Units cont BASE UNIT WITHTable 6 Ð Electrical Data, 064 Units Table 6 Ð Electrical Data, 064 Units cont Table 6 Ð Electrical Data, 064 Units cont BASE UNIT WITHTable 7 Ð Electrical Data, 074 Units Table 7 Ð Electrical Data, 074 Units cont Table 7 Ð Electrical Data, 074 Units cont BASE UNIT WITHFig. 19 Ð Field Control Thermostat Wiring NOTES AND LEGEND FOR FIG.034 AND 044 UNITS OPTIONAL MODULATING POWER EXHAUSTOPTIONAL MODULATING POWER EXHAUST BASE UNIT BASE UNIT BASE UNITFig. 22 Ð Flue/Inlet Hood, 034,044 Units Installing Flue/Inlet Hoods 48 Series Units OnlyFig. 21 Ð Gas Piping Details Fig. 23 Ð Inlet HoodFig. 27 Ð Flue/Inlet Hood, 054-074Units Fig. 24 Ð Flue HoodFig. 25 Ð Flue De¯ector Baffles, 034,044 Units Fig. 28 Ð Flue/Inlet Hood Close-Up50 Series Vertical Discharge 054-074Units PRE-START-UPFig. 30 Ð Shipping Brackets; 034,044 Units and Table 8 Ð Oil ChargeGas Manifold Pressure 48 Series Units Only Evaporator-FanBelts, Pulleys, and Sheaves ÐTable 10 Ð Air Quantity Limits cfm Fig. 32 Ð Condenser-FanAdjustment Initial CheckSTART-UP General SERVICE Fig. 35 Ð Modulating Power Exhaust Damper Fig. 34 Ð Typical Filter Drier and Liquid ServiceValve Access Motor Access, 034 and 044 UnitsFig. 37 Ð Gas Section Detail, 48 Series 034 and Fig. 40 Ð Flue Box Assembly, 48 Series Units OnlyShown with Burner Assembly 044 UnitsLubrication Fig. 42 Ð Typical Electric Heat Control BoxFig. 43 Ð Inlet Guide Vane Motor Adjustments Fig. 44 Ð Motor Plate AdjustmentFig. 48 Ð Charging Chart, 034 Units; System Fig. 46 Ð Charging Chart, 034 Units; SystemFig. 47 Ð Charging Chart, 034 Units; System Fig. 45 Ð Pulley AlignmentFig. 51 Ð Charging Chart, 044 Units; System Fig. 49 Ð Charging Chart, 034 Units; SystemFig. 50 Ð Charging Chart, 044 Units; System Fig. 52 Ð Charging Chart, 044 Units; SystemFig. 57 Ð Charging Chart, 064 Units; System Fig. 55 Ð Charging Chart, 054 Units; SystemFig. 56 Ð Charging Chart, 064 Units; System Fig. 58 Ð Charging Chart, 074 Units; SystemFig. 60 Ð Auxiliary Switch Stroke Adjustment Main Burner Removal 48 Series Units OnlyProtective Devices High- and Low-PressureSwitch Locations TROUBLESHOOTINGFig. 62 Ð Typical Compressor Overtemperature Table 11 Ð Pressure Switch Settings psigTable 14 Ð Economizer Control Board Checkout Test Table 15 Ð Economizer Control Board Checkout TestTable 16 Ð Economizer Control Board Checkout Test Fig. 64 Ð Control Board Component Arrangement 1.Turn unit power off. Disconnect plugs P1 and P3 Symptom: Compressor no. 2 will not operate3.Reconnect the wires removed in Step 6.Turn unit power off. Reconnect plugs P1 and P4Fig. 65 Ð Compressor Lockout Connections SC Ð Safety CircuitLEGEND CLO Ð Compressor Lockout PÐ Plug LEGEND FOR FIG. Fig. 66 Ð Gas Heat Sections; 48DJ,NP034,044 Units Fig. 67 Ð Gas Heat Sections; 48DJ,NP054-074Units Fig. 68 Ð Gas Heat Section; 48DK034,044 Units Fig. 69 Ð Gas Heat Section; 48DK054-074Units Page Page Page Page Page Page Page Page PACKAGED SERVICE TRAINING Page TEMPERATURES START-UPSTART-UPCHECKLIST PRE-START-UP