Page 1: Table Of Contents
WeatherMaker 48TC**17-30 ® Single Package Rooftop Unit with Gas Heat/Electric Cooling and Puron (R-410A) Refrigerant ® Service and Maintenance Instructions CONTENTS Wet in Use Convenience Outlet Cover ...24 GFCI Maintenance ......24 Page Fuse On Powered Type .
Page 2: Safety Considerations
Heating ........70 Ventilation (Continuous Fan) ....71 WARNING START-UP, PREMIERLINK CONTROLS .
Page 3: Unit Arrangement And Access
Seasonal Maintenance IMPORTANT: Lockout/tag-out is a term used when electrical These items should be checked at the beginning of each season (or power switches are physically locked, preventing power to the more often if local conditions and usage patterns dictate). unit.
Page 4: Supply Fan (Blower) Section
ECONOMIZER AND MANUAL OUTSIDE AIR SCREENS Supply Fan Assembly This air screen is retained by spring clips under the top edge of the The supply fan system consists of two forward-curved centrifugal hood. (See Fig. 3.) blower wheels mounted on a solid blower shaft that is supported by two greasable pillow block concentric bearings.
Page 5: Adjustable-Pitch Pulley On Motor
Loosen the two jack bolt locking nuts beneath the motor Check the tension after a few hours of runtime and re-adjust mounting plate. Turn the jack bolt locking nut counterclock- as required. See Fig. 6. wise to loosen. Adjustable-Pitch Pulley on Motor Turn the jack bolts counterclockwise to loosen and clockwise The motor pulley is an adjustable-pitch type that allows a servicer to tighten.
Page 6: Staged Air Volume (Sav) Control: 2-Speed Fan With Variable Frequency Drive (Vfd)
STAGED AIR VOLUME (SAV) CONTROL: 2- ADDITIONAL VFD INSTALLATION AND SPEED FAN WITH VARIABLE FREQUENCY TROUBLESHOOTING DRIVE (VFD) Additional installation, wiring and troubleshooting information for the VFD can be found in the following manuals: “Variable Staged Air Volume (SAV) Indoor Fan Speed Frequency Drive (VFD) Installation, Setup and Troubleshooting System Supplement.”...
Page 7: Changing Fan Wheel Speed By Changing Pulleys
14. Remove the variable pitch pulley from the old motor and factory pulley. Change fan wheel speed by changing the fixed fan pulley (larger pitch diameter to reduce wheel speed, smaller pitch attach it to the new motor. diameter to increase wheel speed) or select a new system with 15.
Page 8: Evaporator Coils
Periodic cleaning with Totaline environmentally sound coil clean- er is essential to extend the life of coils. This cleaner is available from Carrier Replacement Components Division as P/N: P902- Fig. 12 — Cleaning Condenser Coil 0301 for a one gallon (3.8L) container, and P902-0305 for a 5 gallon (18.9L) container.
Page 9: Coil Maintenance And Cleaning Recommendation
This cleaner is avail- zymatic activity will be destroyed. able from Carrier Replacement Parts Division (P/N: P902-0301 Thoroughly apply Totaline environmentally sound coil for a one gallon (3.8L) container, and P/N: P902-0305 for a 5 gallon (18.9L) container).
Page 10: Refrigerant System Pressure Access Ports
Service tools are available from RCD (P/N P920-0010) that allow Refrigerant System Pressure Access Ports the replacement of the Schrader valve core without having to re- There are two access ports in the system - on the suction tube near cover the entire system refrigerant charge.
Page 11: Humidi-Mizer® Adaptive Dehumidification
modes. Unique components include a Reheat Relay Board (RHB), HUMIDI-MIZER ® ADAPTIVE DEHUMIDIFICA- evaporator coil freezestat, secondary low pressure switch and a TION SYSTEM low outdoor temperature lockout switch (LTLO). Units with two Units with the factory-equipped Humidi-MiZer option are capable refrigeration circuits include a solenoid valve, TXV, freezestat and of providing multiple modes of improved dehumidification as a low-pressure switch for each circuit.
Page 12 RH2.x VALVE RH1.x VALVE HUMIDI-MIZER COIL CONDENSER COIL OUTDOOR AIR COMPRESSOR VALVE EVAPORATOR COIL = CLOSED VALVE INDOOR AIR = OPEN VALVE = 3-WAY VALVE Fig. 17 — Normal Cooling Mode – Humidi-MiZer System RH2.x VALVE RH1.x VALVE HUMIDI-MIZER COIL CONDENSER COIL OUTDOOR AIR COMPRESSOR...
Page 13 Table 2 — Humidi-MiZer Reheat Control Board I/O CONNECTION PIN POINT NAME TYPE UNIT CONNECTION NOTE NUMBER Humidistat/LTLO DI, 24VAC J1A - 1 (1) LTLO Thermostat W1 DI, 24VAC J1A - 2 (2) CTB - REHEAT - 4 Econ Y1 DI, 24VAC J1A - 6 (6) CTB - REHEAT - 5...
Page 14 Table 4 — Humidi-MiZer Troubleshooting PROBLEM CAUSE REMEDY General cooling mode problem See Cooling Service Troubleshooting (Table 5). No dehumidification demand See No Dehumidification Demand, below. Subcooling Reheat Mode Will Not Activate CRC relay operation See CRC Relay Operation, below. Circuit RLV, CLV or LDV valve problem See CLV, RLV or LDV Valve Operation, below.
Page 15: Thermostatic Expansion Valve (Txv)
15. Remove the lockout/tag-out on the main power switch and side of the diaphragm. restore power to the unit. The needle valve on the pin carrier is spring loaded, exert- 16. Complete the charging procedure. ing pressure on the underside of the diaphragm. Therefore,...
Page 16 CLAMP TXV SENSOR TXV SENSOR BULBS BULB CIRCUIT 2 SENSOR BULBS (CIRCUIT 2) CIRCUIT 1 (CIRCUIT 1) Fig. 22 — TXV Sensor Bulb Locations...
Page 17: Refrigerant System Pressure Access Ports
NO CHARGE Refrigerant System Pressure Access Ports There are two access ports in the system: on the suction tube near Use standard evacuating techniques. Evacuate the system down to the compressor, and on the discharge tube near the compressor. 500 microns and let set for 10 minutes to determine if the system These are brass fittings with black plastic caps.
Page 18: Cooling Charging Charts
COOLING CHARGING CHARTS COOLING CHARGING CHART 15 and 17.5 Ton - Circuit A 115F / 46.1C 185.0 105F / 40.6C 175.0 95F / 35.0C 85F / 29.4C 165.0 75F / 23.9C 65F / 18.3C 155.0 55F / 12.8C 45F / 7.2C 145.0 135.0 125.0...
Page 19 COOLING CHARGING CHART 20 Ton - Circuit A 115F / 46.1C 185.0 105F / 40.6C 175.0 95F / 35.0C 85F / 29.4C 165.0 75F / 23.9C 65F / 18.3C 155.0 55F / 12.8C 45F / 7.2C 145.0 135.0 125.0 115.0 105.0 95.0 85.0...
Page 20 COOLING CHARGING CHART 25.0 Ton - Circuit A 115F / 46.1C 180.0 105F / 40.6C 95F / 35.0C 170.0 85F / 29.4C 75F / 23.9C 160.0 65F / 18.3C 55F / 12.8C 150.0 45F / 7.2C 140.0 130.0 120.0 110.0 100.0 90.0 80.0...
Page 21 COOLING CHARGING CHART 27.5 Ton - Circuit A Fig. 29 — Cooling Charging Chart - 27.5 Ton (Circuit A) COOLING CHARGING CHART 27.5 Ton - Circuit B Fig. 30 — Cooling Charging Chart - 27.5 Ton (Circuit B)
Page 22: Compressors
COMPRESSOR ROTATION COMPRESSORS On 3-phase units with scroll compressors, it is important to be Lubrication certain the compressor is rotating in the proper direction. To de- The compressor is charged with the correct amount of oil at the termine whether or not the compressor is rotating in the proper factory.
Page 23: Troubleshooting The Cooling System
TROUBLESHOOTING THE COOLING SYSTEM Refer to Table 5 for additional troubleshooting topics. Table 5 — Cooling Service Troubleshooting PROBLEM CAUSE REMEDY Power failure. Call power company. Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. Defective thermostat, contactor, transformer, or Replace defective component.
Page 24: Convenience Outlets
service power to the unit when the unit disconnect switch or cir- CONVENIENCE OUTLETS cuit breaker is open. Other connection methods will result in the convenience outlet circuit being de-energized when the unit dis- connect or circuit breaker is open. See Fig. 33. WARNING ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal injury or...
Page 25: Fuse On Powered Type
Repair ground wire connections as needed and correct the Mount the weatherproof cover to the backing plate as shown line phasing. in Fig. 34. Press RESET button to clear the tripped condition. Remove two slot fillers in the bottom of the cover to allow service tool cords to exit the cover.
Page 26: Sensor
Duct Smoke Sensor Duct Smoke Sensor Controller Exhaust Tube Exhaust Gasket Sensor Housing Conduit Nuts and Electronics (supplied by installer) See Detail A Intake Conduit Support Plate Gasket Controller Housing Terminal Block Cover and Electronics Cover Gasket (ordering option) TSD-CO2 Conduit Couplings Controller Cover (ordering option)
Page 27: Fiop Smoke Detector Wiring And Response
requires that this sensing tube be attached to the control module PREMIERLINK AND RTU-OPEN CONTROLS bushing. See installation steps. Unit operating functions (fan, cooling and heating) are terminated as described above. RETURN AIR Highlight D DETECTOR MODULE On smoke alarm condition, the smoke detector NO Alarm contact (Shipping position will close, supplying 24V power to the GRA conductor.
Page 28: Sensor And Controller Tests
48TM502525 Fig. 40 — Typical Smoke Detector System Wiring Controller Alarm Test Procedure Sensor and Controller Tests Press the controller’s test/reset switch for seven seconds. SENSOR ALARM TEST Verify that the controller’s Alarm LED turns on. The sensor alarm test checks a sensor’s ability to signal an alarm Reset the sensor by pressing the test/reset switch for two state.
Page 29: Detector Cleaning
be wired to the controller as shown in Fig. 41 and configured to Table 6 — Dirty LED Test operate the controller’s supervision relay. For more information, see “Changing the Dirty Sensor Test.” FLASHES DESCRIPTION 0-25% dirty. (Typical of a newly installed detector) 25-50% dirty 51-75% dirty SMOKE DETECTOR...
Page 30: Indicators
Using a vacuum cleaner, clean compressed air, or a soft bris- • The contacts on the controller’s alarm initiation relay close. tle brush, remove loose dirt and debris from inside the sensor housing and cover. Use isopropyl alcohol and a lint-free cloth •...
Page 31: Resetting Alarm And Trouble Condition Trips
Resetting Alarm and Trouble Condition Trips PROTECTIVE DEVICES Manual reset is required to restore smoke detector systems to Nor- Compressor Protection mal operation. For installations using two sensors, the duct smoke detector does not differentiate which sensor signals an alarm or OVERCURRENT trouble condition.
Page 32: Control Circuit, 24V
TROUBLESHOOTING SUPPLY FAN MOTOR OVER- LOAD TRIPS ROLLOUT SWITCH The supply fan used in 48TC units is a forward-curved centrifu- gal wheel. At a constant wheel speed, this wheel has a character- istic that causes the fan shaft load to DECREASE when the stat- VALVE ic pressure in the unit-duct system increases and to INCREASE when the static pressure in the unit-duct system decreases (and...
Page 33: Fuel Types And Pressures
automatic on rise in supply line pressure. Reset of the IGC re- Fuel Types and Pressures quires a recycle of unit power after the low pressure switch has NATURAL GAS closed. The 48TC unit is factory-equipped for use with Natural Gas (NG) LIMIT SWITCH fuel at elevation under 2000 ft (610 m).
Page 34: Combustion-Air Blower
REGULATOR HEATER TUBE SEAL STRIPS, SPONGE RUBBER GASKET ASSEMBLY REGULATOR BAFFLE ASSEMBLY (LOW NOX ONLY) RETAINER SUPPORT INSULATION ASSEMBLY WIND CAP ASSEMBLY (SHOWN INVERTED, AS SHIPPED) FLUE BAFFLE (LOW NOX ONLY) INDUCER FAN-MOTOR ASSEMBLY BURNER ASSEMBLY Fig. 49 — Typical Heat Exchanger Assembly Combustion-Air Blower Burners and Igniters Clean periodically to assure proper airflow and heating efficiency.
Page 35 ORIFICE 1.00-in (25.4 mm) MANIFOLD PIPE Fig. 50 — Orifice Projection Removal and Replacement of Gas Train See Fig. 44, 49, and 51. Shut off the gas using the manual shutoff switch located in the gas supply line. Turn the gas valve ON/OFF knob to the OFF position. ITEM NO.
Page 36: Gas Valve
IGC Board IGC Board Fig. 53 — Unit Control Box/IGC Location Gas Valve CHECK UNIT OPERATION AND MAKE NECESSARY ADJUSTMENTS All unit sizes are equipped with 2-stage gas valves. See Fig. 54 for locations of adjustment screws and features. NOTE: Gas supply pressure at the gas valve inlet must be within specified ranges for the fuel type and unit size.
Page 37: Burner Ignition
When replacing unit orifices, order the neces- 19 for additional information. sary parts through the Carrier Replacement Components Division (RCD). See Table 14 for available orifice sizes. See Table 15 for If lockout occurs, unit may be reset by interrupting power supply IGC connection sizes.
Page 38 IGNITER AND SENSOR LOCATIONS (BRACKET HEAT COVER NOT SHOWN FOR CLARITY) 9 CELL 50HE400026 0.12 - 0.14” 0.18” (4.60 mm) (3.05 - 3.56 mm) SPARK GAP NOTE: SPARK GAP MUST BE AT THE BOTTOM OF THE BURNER. Fig. 55 — Typical MRT Spark Adjustment...
Page 39 Table 14 — Orifice Sizes ORIFICE DRILL SIZE CARRIER PART NMBR DRILL DIA. (in.) LH32RF129 0.1285 LH32RF125 0.1250 LH32RF120 0.1200 LH32RF116 0.1160 LH32RF113 0.1130 LH32RF111 0.1110 LH32RF110 0.1100 LH32RF105 0.1065 LH32RF104 0.1040 LH32RF102 0.1015 LH32RF103 0.0995 LH32RF098 0.0980 LH32RF096 0.0960 LH32RF094 0.0935...
Page 40 Fig. 56 — Typical IGC Wiring Diagram...
Page 41 RED LED - STATUS Fig. 57 — Integrated Gas Control (IGC) Board...
Page 42 Table 15 — IGC Connections CONNECTION PIN TERMINAL LABEL POINT DESCRIPTION SENSOR LOCATION TYPE OF I/O NUMBER INPUTS RT, C Input power from TRAN 1 control box 24 VAC — Speed sensor gas section analog input J1, 1-3 FS, T1 Flame sensor gas section switch input...
Page 43 Table 16 — Altitude Compensation* (17 - 30) – Natural Gas NATURAL GAS NOMINAL HEAT INPUT ELEVATION 220k BTUH 310k BTUH 400k BTUH Input Input Input Feet Meters Orifice Size Orifice Size Orifice Size (btu/hr) (btu/hr) (btu/hr) 0 - 2000 0-610 220,000 310,000...
Page 44: Troubleshooting Heating System
MINIMUM HEATING ENTERING AIR TEMPERATURE when heating is initiated using low entering air temperatures with insufficient heating temperature rise. When operating on first stage heating, the minimum temperature of air entering the dimpled heat exchanger is 50°F (10°C) continu- Thermostat ous and 45°F (7°C) intermittent for standard heat exchangers and 40°F (4°C) continuous and 35°F (2°C) intermittent for stainless steel heat exchangers.
Page 45 Table 19 — IGC Board LED Alarm Codes LED FLASH ACTION TAKEN BY DESCRIPTION RESET METHOD PROBABLE CAUSE CODE CONTROL Normal Operation — — — Loss of power to the IGC. Check 5 amp Hardware Failure No gas heating — fuse on IGC, power to unit, 24V circuit breaker, transformer, and wiring to the IGC.
Page 46: Economi$Er Systems
ECONOMI$ER SYSTEMS WIRING HARNESS IMPORTANT: Any economizer that meets the economizer re- OUTSIDE AIR quirements as laid out in California’s Title 24 mandatory sec- TEMPERATURE SENSOR tion 120.2 (fault detection and diagnostics) and/or prescriptive section 140.4 (life-cycle tests, damper leakage, 5 year warranty, sensor accuracy, etc), will have a label on the economizer.
Page 47 Fig. 62 — RTU Open Overlay for Economizer Wiring...
Page 48 Fig. 63 — VFD Overlay for W2770 Controller Wiring...
Page 49 FOR OCCUPANCY CONTROL REPLACE JUMPER WITH FIELD-SUPPLIED TIME CLOCK LEGEND Potentiometer Defaults Settings: Power Exhaust Middle — Demand Controlled Ventilation Minimum Pos. Fully Closed DCV Max. Middle — Indoor Air Quality DCV Set Middle — Low Ambient Lockout Device Enthalpy C Setting —...
Page 50: Economi$Er Iv Standard Sensors
An outdoor-air temperature is used to determine when the EconoMi$er IV simulator program is available from Carrier to EconoMi$er IV can be used for free cooling. The sensor is facto- help with EconoMi$er IV training and troubleshooting.
Page 51 SUPPLY AIR TEMPERATURE (SAT) SENSOR can be added to allow for different types of changeover control and operation of the EconoMi$er IV and unit. The supply air temperature sensor is a 3 K thermistor located at the inlet of the indoor fan. (See Fig. 67.) This sensor is factory in- OUTDOOR DRY BULB CHANGEOVER stalled.
Page 52 turn the enthalpy setpoint potentiometer fully clockwise to the D setting. (See Fig. 69.) ECONOMI$ER IV CONTROLLER 24 Vac ECONOMI$ER IV Open GROMMET RETURN AIR Free SENSOR Cool RETURN DUCT (FIELD-PROVIDED) Fig. 71 — Return-Air Temperature or Enthalpy Sensor Mounting Location Fig.
Page 53 3. Ensure that the factory-installed jumper is in place across CO SENSOR MAX RANGE SETTING terminals P and P1. If remote damper positioning is being 6000 used, make sure that the terminals are wired according to Fig. 68 and that the minimum position potentiometer is 5000 turned fully clockwise.
Page 54 See Table 21. continue to the next variable. Use setting 1 or 2 for Carrier equipment. See Table 21. DEHUMIDIFICATION OF FRESH AIR WITH DCV 1. Press Clear and Mode buttons. Hold at least 5 seconds (DEMAND CONTROLLED VENTILATION) CONTROL until the sensor enters the Edit mode.
Page 55: Economi$Er® X (Factory Option)
7. If connected, remove sensor from terminals SO and +. DCV MINIMUM AND MAXIMUM POSITION Connect 1.2 kilo-ohm 4074EJM checkout resistor across To check the DCV minimum and maximum position: terminals SO and +. 1. Make sure EconoMi$er IV preparation procedure has been 8.
Page 56 • Relay Digital Output Rating at 30 vac (maximum power from Class 2 input only) — 1.5A run: 3.5A inrush at 0.45PF (200,000 cycles) or 7.5A inrush at 0.45PF (100,000 cycles) • External Sensors Power Output — 21 vdc ± 5% at 48mA IMPORTANT: All inputs and outputs must be Class 2 wiring.
Page 57 NOTE: The four terminal blocks are removable. Slide out each Table 23 — Economizer Module terminal block, wire it, and then slide it back into place. (Right Hand Terminal Blocks) LABEL TYPE DESCRIPTION Top Right Terminal Blocks AUX2 I 24 vac IN The first terminal is not used.
Page 58 To use the keypad when working with menus: Table 24 — HH57AC081 Sensor Wiring Terminations • Press the ▲ (Up arrow) button to move to the previous menu. TERMINAL TYPE DESCRIPTION • Press the ▼ (Down arrow) button to move to the next NUMBER LABEL menu.
Page 59 NOTE: Some parameters in the menus use the letters MA or The setup process uses a hierarchical menu structure that is easy to MAT, indicating a mixed air temperature sensor location before use. Press the ▲ and ▼ arrow buttons to move forward and back- the cooling coil.
Page 60 Table 26 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † DEMAND CONTROLLED VENTILATION STATUS DCV STATUS — ON/OFF Displays ON if above set point and OFF if below set point, and ONLY if a CO sensor is connected.
Page 61 Table 26 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † DCV MINIMUM DAMPER POSITION 2 to 10 vdc or 100 Displays only if a CO sensor is connected. Used for Va to 9990 cfm (ventilation min cfm) set point.
Page 62 Table 26 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † COOLING STAGE 3 DELAY 0 min, 5 min, Delay after stage 2 cool has been active. Turns on second stage 15 min, then 15 min of cooling when economizer is first stage call and mechanical STG3 DLY...
Page 63 Table 26 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † RA SYLK T ERR — — RETURN AIR S-BUS SENSOR ERROR Return air enthalpy sensor has failed or become disconnected - RA SYLK H ERR —...
Page 64 Table 27 — Damper Minimum Position Settings and Readings on Checkout Menu DEMAND CONTROLLED VENTILATION FAN SPEED SETPOINTS CHECKOUT SENSOR) MIN POS VMAX–HS — — MIN POS H VMAX–HS MIN POS L VMAX–LS VENT MIN VMAX–HS VENT MAX VMAX–HS VENT MIN H VMAX–HS VENT MAX H VMAX–LS...
Page 65 Table 30 — Enthalpy Operation without DCV (CO Sensor) — 1 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED VENTILATION (DCV) ECONOMIZE High 0-v/Off 0-v/Off MIN POS Closed High 24-v/On 0-v/Off MIN POS Closed High 24-v/On...
Page 66 Table 33 — Dry Bulb Operation with DCV (CO Sensor) — 2 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I Y1-O Y2-O OCCUPIED UNOCCUPIED SPEED VENTILATION (DCV) ECONOMIZE 0v/Off 0v/Off VENTMIN Closed 24v/On 0v/Off VENTMIN Closed HIGH 24v/On 24v/On VENTMIN Closed...
Page 67 Table 35 — Enthalpy Operation with DCV (CO Sensor) — 2 Speed Fan DEMAND OUTSIDE AIR CONTROLLED GOOD TO Y1-I Y2-I Y1-O Y2-O OCCUPIED UNOCCUPIED SPEED VENTILATION (DCV) ECONOMIZE 0v/Off 0v/Off VENTMIN Closed 24v/On 0v/Off VENTMIN Closed HIGH 24v/On 24v/On VENTMIN Closed 0v/Off...
Page 68 ECONOMIZING DUAL ENTHALPY AVAILABLE HIGH LIMIT NOT AVAILABLE SINGLE ENTHALPY P2 (T,RH) (T,RH) TEMPERATURE Fig. 80 — Single Enthalpy Curve Boundaries Table 37 — Single Enthalpy and Dual Enthalpy High Limit Curves POINT P1 POINT P2 ENTHALPY TEMP. DRY TEMP. ENTHALPY HUMIDITY HUMIDITY...
Page 69: Pre-Start-Up/Start-Up
If one or more alarms are present and there has been no keypad ac- Proceed as follows to inspect and prepare the unit for initial start- tivity for at least 5 minutes, the Alarms menu displays and cycles through the active alarms. Remove all access panels.
Page 70: Return-Air Filters
Compressor Mounting Compressors are internally spring mounted. Do not loosen or re- WARNING move compressor hold down bolts. FIRE, EXPLOSION HAZARD Internal Wiring Failure to follow this warning could result in death, serious Check all electrical connections in unit control boxes. Tighten as personal injury and/or property damage.
Page 71: Ventilation (Continuous Fan)
Set system switch selector at HEAT position and fan switch at START-UP, PREMIERLINK CONTROLS AUTO. or ON position. Set heating temperature lever above room temperature. NOTICE: SET-UP INSTRUCTIONS The induced-draft motor will start. All set-up and set point configurations are factory set and field- After a call for heating, the main burners should light within adjustable.
Page 72: Nomenclature
APPENDIX A — MODEL NUMBER NOMENCLATURE Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type 48 - Gas Heat Packaged Rooftop Packaging 0 = Standard Model Series - WeatherMaker ® TC - Standard Efficiency Electrical Options A = Non USA models - No (SAV) included C = Non-Fused Disconnect...
Page 73 APPENDIX A — MODEL NUMBER NOMENCLATURE Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type Packaging 48 - Gas Heat Packaged Rooftop 0 = Standard ® Model Series - WeatherMaker Electrical Options TC - Standard Efficiency A = Non-USA models - No (SAV) included C = Non-Fused Disconnect G = Standard USA models - (SAV) included...
Page 74: Appendix B - Physical Data
APPENDIX B — PHYSICAL DATA Table A — Physical Data - Vertical (Cooling) 15 To 25 Tons (Novation Coils) 48TC*D17 48TC*D20 48TC*D24 48TC*D28 REFRIGERATION SYSTEM MCHX MCHX MCHX MCHX # Circuits / # Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll...
Page 75 APPENDIX B — PHYSICAL DATA Table A — Physical Data - Vertical (Cooling) 15 To 25 Tons (Novation Coils) (cont) 48TC*D17 48TC*D20 48TC*D24 48TC*D28 COND. COIL (CIRCUIT B) Coil type Novation Novation Novation Novation Coil length (in.) Coil height (in.) Rows / FPI 1 / 20.3 1 / 20.3...
Page 76 APPENDIX B — PHYSICAL DATA Table B — Physical Data - Vertical (Cooling) 15 To 17.5 Tons (RTPF Coils) 48TC*D17 48TC*E17 48TC*D20 48TC*E20 REFRIGERATION SYSTEM RTPF RTPF RTPF RTPF # Circuits / # Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll...
Page 77 APPENDIX B — PHYSICAL DATA Table B — Physical Data - Vertical (Cooling) 15 To 17.5 Tons (RTPF Coils) (cont) 48TC*D17 48TC*E17 48TC*D20 48TC*E20 COND. COIL (CIRCUIT A) Coil type RTPF RTPF RTPF RTPF Coil length (in.) Coil height (in.) Rows / FPI 2 / 17 2 / 17...
Page 78 APPENDIX B — PHYSICAL DATA Table C — Physical Data - Vertical (Cooling) 20 To 27.5 Tons (RTPF Coils) 48TC*D24 48TC*E24 48TC*D28 48TC*E28 48TC*D30 REFRIGERATION SYSTEM RTPF RTPF RTPF RTPF RTPF # Circuits / # Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll...
Page 79 APPENDIX B — PHYSICAL DATA Table C — Physical Data - Vertical (Cooling) 20 To 27.5 Tons (RTPF Coils) (cont) 48TC*D24 48TC*E24 48TC*D28 48TC*E28 48TC*D30 COND. COIL (CIRCUIT B) Coil type RTPF RTPF RTPF RTPF RTPF Coil length (in.) Coil height (in.) Rows / FPI 2 /17 2 /17...
Page 80 APPENDIX B — PHYSICAL DATA Table D — Physical Data - Horizontal (Cooling) 15 To 17.5 Tons (RTPF Coils) 48TC*D18 48TC*E18 48TC*D21 48TC*E21 REFRIGERATION SYSTEM RTPF RTPF RTPF RTPF # Circuits / # Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll...
Page 81 APPENDIX B — PHYSICAL DATA Table D — Physical Data - Horizontal (Cooling) 15 To 17.5 Tons (RTPF Coils) (cont) 48TC*D18 48TC*E18 48TC*D21 48TC*E21 COND. COIL (CIRCUIT B) Coil type RTPF RTPF RTPF RTPF Coil length (in.) Coil height (in.) Rows / FPI 2 /17 2 /17...
Page 82 APPENDIX B — PHYSICAL DATA Table E — Physical Data - Horizontal (Cooling) 20 To 25 Tons (RTPF Coils) 48TC*D25 48TC*E25 48TC*D29 48TC*E29 REFRIGERATION SYSTEM RTPF RTPF RTPF RTPF # Circuits / # Comp. / Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll...
Page 83 APPENDIX B — PHYSICAL DATA Table F — Physical Data - Vertical (Heating) 15 To 27.5 Tons 48TC**17 48TC**20 48TC**24 48TC**28 48TC**30 GAS CONNECTION # of gas valves Nat. gas supply line press. (in. wg) / (PSIG) 5 -13 / 0.18-0.47 5 -13 / 0.18-0.47 5 -13 / 0.18-0.47 5 -13 / 0.18-0.47...
Page 84 APPENDIX B — PHYSICAL DATA Table G — Physical Data - Horizontal (Heating) 15 To 25 Tons 48TC**18 48TC**21 48TC**25 48TC**29 GAS CONNECTION # of gas valves Nat. gas supply line press. (in. wg) / (PSIG) 5 -13 / 0.18-0.47 5 -13 / 0.18-0.47 5 -13 / 0.18-0.47 5 -13 / 0.18-0.47...
Page 85: Appendix C - Fan Performance
APPENDIX C — FAN PERFORMANCE Table H — 48TCF*17 Vertical Supply (15 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 4500 0.77 1.09 1.43 1.80 2.19 4900 0.93 1.27 1.64 2.03 2.44 5250 1.10 1.45 1.84 2.24 2.67 5650 1.32 1.68 2.09 2.51 2.96...
Page 86 APPENDIX C — FAN PERFORMANCE Table I — 48TCF*20 Vertical Supply (17.5 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 5250 1.10 1.45 1.84 2.24 2.67 5700 1.35 1.72 2.12 2.55 3.00 6150 1.63 2.02 2.44 2.90 3.37 6550 1.92 2.32 2.77 3.24 3.73...
Page 87 APPENDIX C — FAN PERFORMANCE Table J — 48TCF*24 Vertical Supply (20 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 6000 1.53 1.84 2.16 2.49 2.83 6500 1.88 2.22 2.56 2.92 3.28 7000 2.29 2.65 3.02 3.40 3.78 7500 2.76 3.15 3.54 3.94 4.34...
Page 88 APPENDIX C — FAN PERFORMANCE Table K — 48TCF*28 Vertical Supply (25 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 7500 2.21 2.60 3.00 3.40 3.81 8150 2.76 3.19 3.61 4.05 1003 4.49 8750 3.35 3.80 4.26 4.73 1042 5.19 9400 4.08 4.57 5.06...
Page 89 APPENDIX C — FAN PERFORMANCE Table L — 48TCF*30 Vertical Supply (27.5 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 8250 2.86 3.28 3.72 4.16 1010 4.60 8950 3.57 4.03 4.50 1008 4.97 1055 5.45 9650 4.39 4.89 1009 5.39 1057 5.89 1102 6.41...
Page 90 APPENDIX C — FAN PERFORMANCE Table M — 48TCF*18 Horizontal Supply (15 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 4500 1.25 1.76 2.31 2.89 3.51 4900 1.51 2.05 2.64 3.26 3.91 5250 1.78 2.35 2.96 3.61 4.29 5650 2.13 2.73 3.37 4.05 4.76...
Page 91 APPENDIX C — FAN PERFORMANCE Table N — 48TCF*21 Horizontal Supply (17.5 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 5250 1.78 2.35 2.96 3.61 4.29 5700 2.17 2.78 3.43 4.11 4.82 6150 2.63 3.27 3.95 4.67 5.42 6550 3.09 3.76 4.48 5.23 6.01...
Page 92 APPENDIX C — FAN PERFORMANCE Table O — 48TCF*25 Horizontal Supply (20 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 6000 1.92 2.44 2.98 3.53 4.10 6500 2.34 2.90 3.48 4.07 4.67 7000 2.83 3.43 4.05 4.67 5.31 7500 3.39 4.03 4.68 5.35 6.03...
Page 93 APPENDIX C — FAN PERFORMANCE Table P — 48TCF*29 Horizontal Supply (25 tons) AVAILABLE EXTERNAL STATIC PRESSURE (in. wg) 7500 3.39 4.03 4.68 5.35 6.03 8000 4.02 4.70 5.39 6.10 6.81 8500 4.73 5.45 6.18 6.93 1034 7.68 9000 5.52 6.28 7.06 1029...
Page 94 APPENDIX C — FAN PERFORMANCE Table Q — Pulley Adjustment (Vertical) Fan RPM at Motor Pulley Settings MOTOR PULLEY TURNS OPEN MOTOR/DRIVE UNIT COMBO Standard Static 3 phase Medium Static High Static 1009 Standard Static 3 phase Medium Static High Static 1078 1058 1039...
Page 95: Appendix D - Wiring Diagrams
APPENDIX D — WIRING DIAGRAMS Table S — Wiring Diagrams 48TC-D17 / 48TC-D28 UNITS DUAL CIRCUIT HUMIDI-MIZER SIZE VOLTAGE CONTROL POWER CONTROL POWER 208/230-3-60 50HE500889 - L 50HE502186 - D 460-3-60 50HE500751- K 50HE500752 - L 50HE502181 - F 50HE502183 - F 575-3-60 50HE500888 - L 50HE502184 - F...
Page 96 APPENDIX D — WIRING DIAGRAMS Fig. C — 48TC D17 - D30 Control Diagram (208/230-3-60; 460-3-60, 575-3-60)
Page 97 APPENDIX D — WIRING DIAGRAMS Fig. D — 48TC D17 - D30 Power Diagram - 208/230-3-60...
Page 98 APPENDIX D — WIRING DIAGRAMS Fig. E — 48TC D17 - D30 Power Diagram - 460-3-60...
Page 99 APPENDIX D — WIRING DIAGRAMS Fig. F — 48TC D17 - D30 Power Diagram - 575-3-60...
Page 100 APPENDIX D — WIRING DIAGRAMS Fig. G — 48TC D17 - D30 Control Diagram with Humidi-MiZer System...
Page 101 APPENDIX D — WIRING DIAGRAMS Fig. H — 48TC D17 - D30 Power Diagram 208/230-3-60 with Humidi-MiZer System...
Page 102 APPENDIX D — WIRING DIAGRAMS Fig. I — 48TC D17 - D30 Power Diagram 460-3-60 with Humidi-MiZer System...
Page 103 APPENDIX D — WIRING DIAGRAMS Fig. J — 48TC D17 - D30 Power Diagram 575-3-60 with Humidi-MiZer System...
Page 104 APPENDIX D — WIRING DIAGRAMS Fig. K — PremierLink™ System Control Wiring Diagram...
Page 105 APPENDIX D — WIRING DIAGRAMS Fig. L — PremierLink™ System Control Wiring Diagram with Humidi-MiZer System...
Page 106 APPENDIX D — WIRING DIAGRAMS Fig. M — RTU-OPEN Wiring Diagram...
Page 107 APPENDIX D — WIRING DIAGRAMS Fig. N — RTU-OPEN Wiring Diagram with Humidi-MiZer System ®...
Page 108: Appendix E - Motormaster Sensor
APPENDIX E — MOTORMASTER SENSOR LOCATIONS SENSOR LOCATION Fig. O — Motormaster Sensor Locations - D17, D20, and D24 ® SENSOR LOCATION Fig. P — Motormaster Sensor Location - D28-D30...
Page 110 © 2020 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480288-01 Printed in U.S.A. Form 48TC-17-30-02SM Pg 110 10-2020 Replaces: 48TC-17-30-01SM...
Page 111: Start-Up Checklist
START-UP CHECKLIST — 48TC 17-30 SINGLE PACKAGE ROOFTOP WITH HEAT/ELECTRIC COOLING WITH PURON (R-410A) REFRIGERANT ® NOTE: To avoid injury to personnel and damage to equipment or property when completing the procedures listed in this start-up checklist, use good judgment, follow safe practices, and adhere to the safety considerations/information as outlined in preceding sec- tions of this Installation Instruction document.
Page 112 10. Restore set-points for thermostat and humidistat (Y/N) _____ REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS © 2020 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480288-01 Printed in U.S.A.

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