Carrier WEATHERMASTER 48ZT- Manuals

22 3 2 A B 4 1 Fig. 14 — Weight Distribution and Center of Gravity UNITS 48ZG,ZN SIZE CORNER WEIGHTS (lb) TOTAL (lb) A B 1 2 3 4 ft-in. ft-in. VERTICAL SUPPLY AND RETURN/LOW GAS HEAT 030 1968 1004 1005 1964 5,941 14- 9 1 / 8 3-9 13 / 16 035 1851 1184 1142 1889 6,066 14-11 3-9 13 / 16 040 2246 1177 1...

23 Condensate Drain Connections — There are a to- tal of five drain connections required on each unit: one primary drain (on right-hand side of the unit) and four secondary drains (two on each side of unit).PRIMARY DRAIN — The primary drain is a 2-in. NPT pipe connection located on the right-hand si...

35 Install Economizer Hoods (48ZT,ZW Units) — The economizer uses a total of 4 outdoor intake hoods, 2 on each side of the unit. See Fig. 37. Two small hoods (one per side) are factory-installed and are pivoted inside the unit chas- sis for shipment. Two large hoods are shipped in packages located i...

36 Field Wire Routing UNIT SIZES 030-050 — Field wiring can be brought into the unit through the basepan and roof curb or through the corner post in the side of the unit next to the control box. A 3 1 / 2 -in. NPT coupling for field power and a 3 / 4 -in. NPT coupling for 24 v control wiring are pro...

37 Units with Factory-Installed Disconnect — The factory- installed disconnect is an interlocking, door-type. The discon- nect handle locks the door when it is in the ON position. The disconnect handle must be in the OFF position to open the con- trol box door. The disconnect is located in a separat...

39 23 13 12 11 22 21 DISCONNECT PER NEC EQUIP GND FIELDWIRE FACTORYWIRE Fig. 44 — Field Power Wiring Connections for Factory-Installed Disconnect 21 11 22 12 23 13 DISCONNECT PER NEC EQUIP GND TB1 Fig. 43 — Factory-Installed Disconnect Location LEGEND Fig. 42 — Field Power Wiring Connections EQUIP —...

40 Table 7 — Electrical Data, 48ZG,ZN030 Units LEGEND NOTE: Units use 1 (low heat) or 2 (high heat) combustion fan motors rated at0.3 FLA each. NOMINAL VOLTAGE (3 Ph 60 Hz) VOLTAGE RANGE COMPRESSOR OFM IFM EXHAUST FAN POWER SUPPLY No. 1 No. 2 RLA LRA RLA LRA Qty Total FLA Hp FLA Total Hp Total FLA M...

41 Table 8 — Electrical Data, 48ZG,ZN035 Units LEGEND NOTE: Units use 1 (low heat) or 2 (high heat) combustion fan motors rated at0.3 FLA each. NOMINAL VOLTAGE (3 Ph 60 Hz) VOLTAGE RANGE COMPRESSOR OFM IFM EXHAUST FAN POWER SUPPLY No. 1 No. 2 RLA LRA RLA LRA Qty Total FLA Hp FLA Total Hp Total FLA M...

42 Table 9 — Electrical Data, 48ZG,ZN040 Units LEGEND NOTE: Units use 1 (low heat) or 2 (high heat) combustion fan motors rated at0.3 FLA each. NOMINAL VOLTAGE (3 Ph 60 Hz) VOLTAGE RANGE COMPRESSOR OFM IFM EXHAUST FAN POWER SUPPLY No. 1 No. 2 RLA LRA RLA LRA Qty Total FLA Hp FLA Total Hp Total FLA M...

51 Air Pressure Tubing — Before options such as inlet guide vanes (IGV), variable frequency drive (VFD), and/or modulating power exhaust can operate properly, the pneumatic tubing for pressure sensing must be installed. Use fire-retardant plenum tubing (field-supplied). All control devices use 1 / 4...

52 AUXILIARYCONTROLBOX BP DP OACFM TRANSDUCER FS DP OACFM TRANSDUCER BP FS Fig. 46 — Auxiliary Control Box Location (Sizes 055-105) LEGEND Fig. 47 — Auxiliary Control Box Details (Sizes 030-050) BP — Building Pressure Transducer DP — Duct Pressure Transducer FS — Filter Switch OACFM — Outdoor Air Cf...

53 Supply-Fan Shipping Brackets — Supply-fan ship- ping brackets (4 per unit) must be removed from each corner of the fan sled before starting unit.UNIT SIZES 030-050 1. To remove brackets, raise fan sled by turning adjusting bolt counterclockwise until spring is compressed slightly. 2. Remove screw...

54 Remove TXV Shipping Blocks — Shipping blocks for the TXV bracket are used on size 030-075 units with high capacity coils and all 075-105 size units. Remove the foam shipping block before starting unit. See Fig. 54. Fig. 52 — Shipping Brackets (Sizes 075-105) Fig. 53 — Return/Exhaust Fan Shipping ...

55 Compressor Mounting SIZES 030-090 — Each compressor is supported on 4 springs. The springs are compressed for shipment. After the unit is installed, the holddown nuts need to be loosened for nor- mal operation. See Fig. 55 for compressor mounting details. Loosen each bolt using nut indicated unti...

56 Installing Flue/Inlet Hoods — The flue and inlet hoods are shipped in a package taped to the basepan in the fan section. The flue (outlet) hoods are pre-assembled. The flue de- flector and inlet hoods require assembly. The hoods are located on the heating section access panel as shown in Fig. 59 ...

57 FLUE HOOD ANDFLUE DEFLECTORHOOD (48 SERIESHIGH-HEAT ONLY) INLET HOOD FLUE HOOD ANDDEFLECTORHOOD INLET HOOD INLET HOOD (ONLY) HOOD DEFLECTORHOOD FLUE ANDFLUE HOOD LARGEINLET INLET LARGE HOODLOCATION HIGH-HEAT SMALLINLETHOOD FLUE HOODAND FLUEDEFLECTOR FLUE AND DEFLECTOR LOCATION ONLY) FLUE HOOD HIG...

58 Table 18 — Flue and Inlet Hood Usage HOOD TYPE PARTS LIST FIG. NO. QUANTITY USED Sizes 030-050 (Low Heat) Sizes 030-050 (High Heat) Sizes 055-070 (Low Heat) Sizes 055-070 (High Heat) Sizes 075-105 (Low Heat) Sizes 075-105 (High Heat) Large Inlet (14-in.) Top (14-in.)Side (Left)Side (Right)ScreenC...

59 Table 19 — SGC Thermistor Designations SGC — Staged Gas Controller Install Unit Accessories — For applications requiring accessories, the following packages are available:All units: • barometric relief • space temperature sensor • CO 2 sensor • space temperature sensor with CO 2 • airflow switch ...

60 SPACE TEMPERATURE SENSOR (T-56) — The space tem- perature sensor (P/N 33ZCT56SPT) wires are connected to terminals in the unit main control box. To connect the space temperature sensor, see Fig. 68.COMMUNICATING SPACE TEMPERATURE SENSOR (T-58) — The communicating space temperature sensor (P/N 33Z...

61 d. Secure shield wire to CCN screw terminal SHIELD on the COMM board. RJ14 PLUG WIRING — Units on the CCN can be monitored from the space at the sensor through the RJ14 connector, if desired. To wire the RJ14 connector into the CCN (Fig. 80): 1. Cut the CCN wire and strip ends of the red (+), whi...

62 8 9 RED BLK 8 9 SENSOR 1 SENSOR 2 SENSOR 3 SENSOR 4 SENSOR 1 SENSOR 2 SENSOR 3 SENSOR 4 SENSOR 5 SENSOR 6 SENSOR 7 SENSOR 8 SENSOR 9 SPACE TEMPERATURE AVERAGING (4 SENSOR APPLICATION) SPACE TEMPERATURE AVERAGING (9 SENSOR APPLICATION) TB202 TB202 Fig. 69 — Space Temperature Averaging Wiring NOTE:...

63 FIELD INSTALLED (FIELD SUPPLIED) JUMPER WHEN ENTHALPY SWITCH NOT USED RCBJ4 MBBJ8 FILTER STATUS MBB J8 Fig. 70 — Heat Interlock Relay Wiring Fig. 71 — Outdoor Air Enthalpy Switch Wiring Fig. 72 — CO 2 Space Sensor Wiring Fig. 73 — Filter Status Wiring

64 RCB J4 CEMJ6 Fig. 74 — Fan Status Switch Wiring Fig. 75 — Space and Return Air Humidity Sensor Wiring Fig. 76 — Return Air CO 2 Sensor Wiring

65 MBB J6 RCB J4 Fig. 77 — Return Air Smoke Detector Wiring Fig. 78 — Fire Shutdown Wiring Fig. 79 — Purge, Evacuation, and Pressurization Wiring