Carrier 48NLT Manuel d'utilisateur

HEATING & COOLING48NLT, NMT, NET, NHT AND NVT 018-060Packaged Heating/Cooling UnitsInstallation, Start-Up and Service InstructionsCONTENTSSAFETY C

SPECIAL PROCEDURES FOR 208-V OPERATIONÁ WARNINGMake sure that the power supply to the unit is switched OFF before making any wiring changes. Electrica

фa refrigerant leak. Leak-test all refrigerant tubing connections using electronic leak detector, or liquid- soap solution. If a refrigeran

Table 4 — Rated Gas InputsUNIT 48NUMBEROFORIFICESGAS SUPPLY PRESSURE (in. wg)MANIFOLD PRESSURE (in. wg)NATURAL GASPROPANE*Natural PropaneOrificeOriliS

PILOT FLAME BURNER FLAMEfltSAFETY CHECK OF LIMIT CONTROL - The control shuts off the gas supply and energizes the circulating-air blowe

r @-RED-SIN6LE STA6E HEAT K SIN6LE STAGE COOL THERMOSTAT CTYPJBUCKED - ORN -TRANBRN —^ ®©<£>® PCI ®® I—I I—3 ®<!> 0 <»> 0 0r^Pi&apo

FIELD L3 POWER L2 SUPPLYSIN6LE 5TA6E HEAT S SIN6LE STA6E COOL TfCRMOSTAT CTYPJBLK- RSI - ORN -TRANBRN^5—{j^ I—@©ilHl—®EGCAPI1 Co o)^ CAP2ICOMPOWB^

Start-Up Cooling Section and Make AdjustmentsA CAUTIONComplete the required procedures given in the Pre-Start- Up section before starting the unit.Do

Table 5 — Air Delivery (Cfm) at Indicated Temperature Rise and Rated Heating inputNOMINAL SIZEHEATINGUNIT TEMPERATURE RISE (T)INPUT (Btuh)2025303540 4

Table 8 — Dry Coil Air Delivery (Cfm)* at Indicated External Static Pressure and Voltage — Horizontal Discharge (Without Filter)48V-PH-HZMOTORSPEED208

Table 9 - Dry Coil Air Delivery (Cfm)* at Indicated External Static Pressure and Voltage — Vertical Discharge (Without Filter)48V-PH-HZMOTORSPEED208 V

RIGHT SIDE VIEWLEFT SIDE VIEWFig. 2 — 48 Dimensional Drawing, Sizes NLT018 — NET042

to terminals Y and G. These completed circuits through the thermostat connect contactor coil C (through unit wire Y) and relay coil IFRl (

Table 11 — Heating Troubleshooting ChartSYMPTOMCAUSEREMEDYIGN locked out.LED flashingLook for problems external to the ignitor module.LED glowing cont

Table 12 — Cooling Troubleshooting ChartSYMPTOMCAUSE REMEDYCpmpressor and con- denser fan will not start.Power failure Call power companyFuse blown or

Air FilteriA CAUTIONNever operate the unit without a suitable air filter in the return-air duct system. Always replace the filter with the s

Heating Section — Ensure dependable and efficient heating operation by inspecting the heating section before each heating season, and cle

Condenser FanfA CAUTIONKeep the condenser fan free from all obstructions to ensure proper cooling operation. Never place articles on top

Table 13 — Piston SizesUNIT 48PISTON IDENTIFICATIONNLT01859NLT02463NHT024 63NLT030 73NMT030 73NHT030 73NET036 80NLT036 80NMT036 80NHT036 80NVT03680NET

iCopyright 1991 Carrier CorporationManufacturer reservea the right to discontinue, or change at any time, specifications or designs without notice and

UNITELECTRICAL CHARACTERISTICSUNIT WTCORNER WT LB/KGLBKGA BCD48NHT036208/230/1/60, 208/230/3/60, 460/3/60530241 117/53 147/67148/67 118/5448NVT036208/

Table 1 — Physical DataUNIT SIZE 48NLT018 NLT024NHT024NLT030NMT030 NHT030NLT036NMT036NET036 NHT036NVT036NOMINAL CAPACITY (ton)IV222V23OPERATING WEIGHT

Table 1 — Physical Data (cent)UNIT SIZE 48NLT042NMT042NET042NHT042NVT042NLT048NMT048NHT048NVT048NLT060NMT060NHT060NVT060NOMINAL CAPACITY (ton)3Vz45OPE

r MINCondensate water can be drained directly onto the roof in rooftop installations (where permitted) or onto a gravel apron in ground-level instal

INtesting of the piping systems when test pressure in excess of 0.5 psig. Pressure test the gas supply piping system at pressures

3. Use flexible transition between rigid ductwork and unit to prevent transmission of vibration. The transition may be screwed or bolted to

Table 3 — Electrical DataUNITSIZENOMINALV-PH-HZMODEL NO. 48VOLTAGERANGECOMPRCONDENSER- FAN MOTOREVAPORATOR- FAN MOTORAWG MIN WIRE SIZEPOWER SUPPLYMin