Page 1: Table Of Contents
® WeatherMaster 48HC*D17-D28 Gas Heat/Electric Cooling with Puron ® (R-410A) Refrigerant Service and Maintenance Instructions CONTENTS Non-Powered Type ......24 Unit-Powered Type .
Page 2: Safety Considerations
SAFETY CONSIDERATIONS Improper installation, adjustment, alteration, service, WARNING maintenance, or use can cause explosion, fire, electrical shock UNIT DAMAGE HAZARD or other conditions which may cause personal injury or property damage. Consult a qualified installer, service agency, Failure to follow this caution may result in reduced unit or your distributor or branch for information or assistance.
Page 3: Routine Maintenance
• Refrigerant charge level SUPPLY FAN OUTDOOR HEATING SECTION • Evaporator coil cleaning FANS/MOTORS OUTDOOR AIR HOOD • Evaporator blower motor amperage Heating • Heat exchanger flue passageways cleanliness • Gas burner condition • Gas manifold pressure • Heating temperature rise Economizer or Outside Air Damper CONDENSER DISCONNECT...
Page 4: Supply Fan (Blower) Section
17 1/4” V-BELT DIVIDER OUTSIDE MOTOR HOOD CLEANABLE ALUMINUM FILTER FILTER MOTOR ADJUSTMENT BOLTS (4) BAROMETRIC RELIEF JACKBOLT LOCKING NUT (2) FILTER MOTOR MOUNTING PLATE CLIP JACKBOLT (2) Fig. 3 — Inlet Air Screen Installation Fig. 4 — Belt Drive Motor Mounting SUPPLY FAN (BLOWER) SECTION STRAIGHTEDGE CAUTION...
Page 5: Staged Air Volume (Sav) Control
REPLACING THE V-BELT Set movable flange at nearest keyway or flat of pulley hub and tighten setscrew to torque specifications. Torque pul- Use a belt with same section type or similar size. Do not ley set screw to 72 ± 5 in.-lb (8.14 ± 0.56 Nm). substitute a “FHP”...
Page 6: Identifying Factory Option
call for the second stage of cooling is required, the SAV system will allow the design airflow rate for the unit established (100%). During the heating mode, the SAV system will allow total design airflow rate (100%) operation. During ventilation VARIABLE mode, the SAV system will operate the fan motor at speed.
Page 7: Additional Vfd Installation And Troubleshooting
15. Inspect variable pitch pulley for cracks and wear. Replace ADDITIONAL VFD INSTALLATION AND the pulley if necessary. TROUBLESHOOTING 16. Secure the pulley to the motor by tightening the pulley set- Additional installation, wiring and troubleshooting information screw to the motor shaft. for the VFD can be found in the following manual: Variable 17.
Page 8: Condenser Coil Service
This cleaner is ple: a standard drive cannot be changed to a high static available from Carrier Replacement Components Division as drive. This type of change will alter the unit’s certification...
Page 9: Evaporator Coils
This cleaner is zymatic activity will be destroyed. available from Carrier Replacement Parts Division (P/N: P902- Thoroughly apply Totaline environmentally sound coil 0301 for one gallon (3.8L) container, and P/N: P902-0305 for a cleaner solution to all coil surfaces including finned area, 5 gallon (18.9L) container).
Page 10: Evaporator Coil Metering Devices
Interior and exterior finned areas must be thoroughly Refrigerant System Pressure Access Ports cleaned. There are two access ports in the system - on the suction tube 10. Finned surfaces should remain wet with cleaning solution near the compressor and on the discharge tube near the com- for 10 minutes.
Page 11: Humidi-Mizer® Adaptive Dehumidification
® HUMIDI-MIZER ADAPTIVE DEHUMIDIFICATION Humidi-MiZer System Components SYSTEM The Humidi-MiZer uses the standard unit compressor(s), evapo- rator coil and Round Tube-Plate Fin (RTPF) condenser coil. Ad- Units with the factory-equipped Humidi-MiZer option are ca- ditional refrigeration system hardware includes a subcooler/re- pable of providing multiple modes of improved dehumidifica- heat coil and solenoid valves.
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. 16 — 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 POINT NAME TYPE CONNECTION PIN NUMBER UNIT CONNECTION NOTE 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 Thermostat G DI, 24VAC J1B-1 (7) CTB-REHEAT-1 24V Power (J1)
Page 14: Thermostatic Expansion Valve (Txv)
® Table 4 — Humidi-MiZer Troubleshooting (cont) PROBLEM CAUSE REMEDY Relative humidity setpoint is too low — Check/reduce setting on accessory humidistat. Humidistat Check Space RH Setpoints (SetpointsRH.SP and Relative humidity setpoint is too low — RH RH.UN) and occupancy using ComfortLink Scrolling sensor.
Page 15: Txv Operation
OUTLET transferred through the external equalizer tube to the NEEDLE underside of the diaphragm. VALVE The needle valve on the pin carrier is spring loaded, exert- SPRING BULB ing pressure on the underside of the diaphragm. Therefore, DISTRIBUTOR the bulb pressure equals the evaporator pressure (at the outlet of the coil) plus the spring pressure.
Page 16: Replacing Txv
Replacing TXV Refrigerant System Pressure Access Ports There are two access ports in the system - on the suction tube near the compressor and on the discharge tube near the com- CAUTION pressor. These are brass fittings with black plastic caps. The hose connection fittings are standard -in.
Page 17: Refrigerant Charge
EXAMPLE: Refrigerant Charge Model 48HC*D28 Unit panels must be in place when unit is operating during the charging procedure. To prepare the unit for charge adjustment, Circuit A use the following instructions. Outdoor Temperature ..... . 85°F (29°C) NO CHARGE Suction Pressure .
Page 18: Cooling Charging Charts
COOLING CHARGING CHARTS Fig. 22 — Cooling Charging Chart - 15 Ton...
Page 19 Fig. 23 — Cooling Charging Chart - 17.5 Ton...
Page 20 Fig. 24 — Cooling Charging Chart - 20 Ton...
Page 21 Fig. 25 — Cooling Charging Chart - 25 Ton...
Page 22: Compressors
COMPRESSOR ROTATION COMPRESSORS On 3-phase units with scroll compressors, it is important to be Lubrication certain compressor is rotating in the proper direction. To deter- Compressors are charged with the correct amount of oil at the mine whether the compressor is rotating in the proper direction: factory.
Page 23 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, Replace defective component. Compressor and Condenser Fan Will or control relay. Not Start.
Page 24: Convenience Outlets
above 8-amps (i.e., limit loads exceeding 8-amps to 30 minutes CONVENIENCE OUTLETS of operation every hour). The primary leads to the convenience outlet transformer are WARNING not factory-connected. Selection of primary power source is a customer option. If local codes permit, the transformer primary ELECTRICAL OPERATION HAZARD leads can be connected at the line-side terminals on a unit- Failure to follow this warning could result in personal inju-...
Page 25: Fuse On Powered Type
Repair ground wire connections as needed and correct line GFCI RECEPTACLE phasing. NOT INCLUDED COVER - WHILE-IN-USE Press the RESET button to clear the tripped condition. WEATHERPROOF Fuse On Powered Type The factory fuse is a Bussmann “Fusetron” T-15, non-renew- able screw-in (Edison base) type plug fuse.
Page 26: Sensor
The sensor uses a photoelectric (light scattering principle) pro- cess called differential sensing preventing gradual environmen- tal changes from triggering false alarms. A rapid change in en- vironmental conditions, such as smoke from a fire, causes the sensor to signal an alarm state, but dust and debris accumulated over time does not.
Page 27 SUPPLY-AIR SMOKE DETECTOR SENSOR SUPPLY-AIR SMOKE DETECTOR SENSOR RETURN-AIR SMOKE DETECTOR SENSOR Fig. 33 — Typical Return-Air Smoke Detector Location (without Economizer) RETURN AIR WITH ECONOMIZER The sampling tube is inserted through the side plates of the economizer housing, placing it across the return air opening on the unit basepan.
Page 28: Fiop Smoke Detector Wiring And Response
HIGHLIGHT B Smoke detector NC contact set will open on smoke alarm con- dition, de-energizing the ORN conductor. HIGHLIGHT C 24-v power signal using the ORN lead is removed at Smoke Detector input on Central Terminal board (CTB); all unit oper- ations cease immediately.
Page 29: Sensor And Controller Tests
Sensor and Controller Tests IMPORTANT: Failure to follow this NOTICE may result in SENSOR ALARM TEST an unnecessary evacuation of the facility. The sensor alarm test checks a sensor’s ability to signal an Holding the test magnet against the sensor housing for alarm state.
Page 30: Detector Cleaning
and other contaminants from the gasket on the sensor’s cover. Squeeze the retainer clips on both sides of the optic hous- ing then lift the housing away from the printed circuit SMOKE DETECTOR board. CONTROLLER Gently remove dirt and debris from around the optic plate −...
Page 31 • If 100% dirty, the sensor’s Dirty LED turns on and the controller’s Trouble LED flashes continuously. • If there is a wiring fault between a sensor and the control- TROUBLE ler, the controller’s Trouble LED turns on but not the sen- sor’s LED.
Page 32: Troubleshooting
RESETTING ALARM AND TROUBLE CONDITION PROTECTIVE DEVICES TRIPS: Compressor Protection Manual reset is required to restore smoke detector systems to OVERCURRENT Normal operation. For installations using two sensors, the duct smoke detector does not differentiate which sensor signals an Each compressor has internal linebreak motor protection. Reset alarm or trouble condition.
Page 33: Control Circuit, 24-V
static pressure in the unit-duct system increases and to IN- ROLLOUT CREASE when the static pressure in the unit-duct system de- SWITCH creases (and fan airflow rate increases). Motor overload condi- tions typically develop when the unit is operated with an access panel removed, with unfinished duct work, in an economizer- VALVE open mode, or a leak develops in the duct system that allows a...
Page 34: Flue Gas Passageways
Table 9 — Natural Gas Supply Line Pressure Ranges GAS VALVE UNIT MODEL UNIT SIZE 4.0 in. wg 13.0 in. wg 48HC (996 Pa) (3240 Pa) Table 10 — Natural Gas Manifold Pressure Ranges UNIT UNIT HIGH RANGE MODEL SIZE FIRE FIRE Reference MRT unit nameplate...
Page 35: Burners And Igniters
HEATER TUBE ASSEMBLY SEAL STRIPS (SPONGE RUBBER) REGULATOR GASKET REGULATOR RETAINER WIND CAP ASSEMBLY (SHOWN INVERTED AS SHIPPED) MOUNTING SCREWS (2) SUPPORT INSULATION ASSEMBLY VESTIBULE PLATE INDUCER FAN MOTOR ASSEMBLY BURNER ASSEMBLY GAS VALVE Fig. 44 — Typical Heat Exchanger Assembly Burners and Igniters ORIFICE CAUTION...
Page 36 Remove igniter wires and sensor wires at the Integrated Gas Unit Controller (IGC). See Fig. 48. Remove the 2 screws that attach the burner rack to the ves- tibule plate. See Fig. 46. Slide the burner tray out of the unit. See Fig. 47. To reinstall, reverse the procedure outlined above.
Page 37 Board Board Side view Front view Fig. 48 — Unit Control Box/IGC Location...
Page 38: Gas Valve
Adjust high-stage pressure to specified setting by turning orifice reference size). When replacing unit orifices, order the the plastic adjustment screw clockwise to increase pres- necessary parts through the Carrier Replacement Components sure, counter-clockwise to decrease pressure. Division (RCD). See Table 14 for available orifice sizes. See Set room thermostat to call for low-stage heat.
Page 39 SPARK GAP NOTE: SPARK GAP MUST BE AT THE BOTTOM OF THE BURNER. Fig. 50 — Typical MRT Spark Adjustment Table 14 — Orifice Sizes (cont) Table 14 — Orifice Sizes ORIFICE CARRIER DRILL ORIFICE CARRIER DRILL DRILL SIZE PART NUMBER DIA.
Page 40 Fig. 51 — Typical IGC Wiring Diagram...
Page 41 RED LED - STATUS Fig. 52 — Integrated Gas Control (IGC) Board Table 15 — IGC Connections CONNECTION TERMINAL LABEL POINT DESCRIPTION SENSOR LOCATION TYPE OF I/O PIN NUMBER INPUTS RT, C Input power from TRAN 1 control box 24 vac —...
Page 42 Table 16 — Altitude Compensation* (17-30) for Natural Gas NATURAL GAS NOMINAL HEAT INPUT ELEVATION 220k BTUH 310k BTUH 400k BTUH Feet Meters Orifice Size Input (btu/hr) Orifice Size Input (btu/hr) Orifice Size Input (btu/hr) 0-2000 0-610 220,000 310,000 400,000 2000 202,400 285,200...
Page 43 MINIMUM HEATING ENTERING AIR TEMPERATURE When operating on first stage heating, the minimum temperature of air entering the dimpled heat exchanger is 50°F (10°C) con- Thermostat tinuous and 45°F (7°C) intermittent for standard heat exchangers and 40°F (4°C) continuous and 35°F (2°C) intermittent for stain- less steel heat exchangers.
Page 44 Table 19 — IGC Board LED Alarm Codes ACTION TAKEN FLASH DESCRIPTION RESET METHOD PROBABLE CAUSE BY CONTROL CODE Normal Operation — — — Loss of power to the IGC. Check 5 amp fuse on IGC, Hardware Failure No gas heating. —...
Page 45: Economi$Er Systems
ECONOMI$ER SYSTEMS WIRING HARNESS IMPORTANT: Any economizer that meets the economizer OUTSIDE AIR requirements as laid out in California’s Title 24 mandatory TEMPERATURE SENSOR section 120.2 (fault detection and diagnostics) and/or pre- scriptive section 140.4 (life-cycle tests, damper leakage, 5 year warranty, sensor accuracy, etc), will have a label on the economizer.
Page 46 Fig. 57 — RTU Open Overlay for Economizer Wiring...
Page 47 Fig. 58 — VFD Overlay for W2770 Controller Wiring...
Page 48 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 NOTES: —...
Page 49: Economi$Er Iv Standard Sensors
An EconoMi$er IV 0°F to 158°F (–18°C to 70°C). simulator program is available from Carrier to help with The temperature sensor looks like an eyelet terminal with wires EconoMi$er IV training and troubleshooting.
Page 50 this control mode, the outdoor temperature is compared to an adjustable setpoint selected on the control. If the outdoor-air temperature is above the setpoint, the EconoMi$er IV will ad- SUPPLY just the outside air dampers to minimum position. If the out- AIR TEMPERATURE door-air temperature is below the setpoint, the position of the SENSOR MOUNTING...
Page 51 ECONOMI$ER IV CONTROLLER ECONOMI$ER IV 24 Vac Open GROMMET RETURN AIR SENSOR Free Cool RETURN DUCT Fig. 66 — Return-Air Temperature or Enthalpy Sensor Mounting Location OUTDOOR ENTHALPY CHANGEOVER Fig. 68 — EconoMi$er IV Control For enthalpy control, accessory enthalpy sensor (part number DIFFERENTIAL ENTHALPY CONTROL HH57AC078) is required.
Page 52 Disconnect the supply air sensor from terminals T and T1. Ensure that the factory-installed jumper is in place across CO SENSOR MAX RANGE SETTING terminals P and P1. If remote damper positioning is being 6000 used, make sure that the terminals are wired according to Fig.
Page 53 If normal rooftop heating and cooling operation is not adequate for the outdoor humidity level, an energy recovery unit and/or Use setting 1 or 2 for Carrier equipment. See Table 21. a dehumidification option should be considered. Press Clear and Mode buttons. Hold at least 5 seconds until the sensor enters the Edit mode.
Page 54: Economi$Er X (Factory Option)
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 +. Make sure EconoMi$er IV preparation procedure has been Put 620-ohm resistor across terminals SR and +.
Page 55 • Nominal Power Consumption (at 24 vac, 60 Hz) — 11.5 VA without sensors or actuators • 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) •...
Page 56 ECONOMIZER MODULE WIRING DETAILS Table 23 — Economizer Module Use Fig. 71 and Tables 22 and 23 to locate the wiring terminals (Right Hand Terminal Blocks) for the Economizer module. NOTE: The four terminal blocks are removable. Slide out each LABEL TYPE DESCRIPTION...
Page 57 • Press the ▲ (Up arrow) button to move to the previous Table 24 — HH57AC081 Sensor Wiring Terminations menu. • Press the ▼ (Down arrow) button to move to the next TERMINAL menu. TYPE DESCRIPTION NUMBER LABEL • Press the (Enter) button to display the first item in the S-BUS currently displayed menu.
Page 58 located after the cooling coil, in the fan section, where it is desig- The setup process uses a hierarchical menu structure that is nated as (Cooling) Supply Air Temperature or SAT sensor. easy to use. Press the ▲ and ▼ arrow buttons to move forward and backward through the menus and press the button to select SETUP AND CONFIGURATION and confirm setup item changes.
Page 59 Table 26 — W7220 Menu Structure* (cont) PARAMETER PARAMETER EXPANDED PARAMETER NAME MENU PARAMETER DEFAULT RANGE AND Notes VALUE INCREMENT † ACT POS 0 to 100% Displays actual position of actuator Displays number of times actuator has cycled. ACT COUNT 1 to 65,535 1 cycle equals 180 degrees of actuator movement in any direction.
Page 60 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 61 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, 15 Delay after stage 2 cool has been active. Turns on second stage min, then 15 min of cooling when economizer is first stage call and mechanical STG3 DLY...
Page 62 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 check wiring, then replace sensor if the alarm continues.
Page 63 Table 27 — Damper Minimum Position Settings and Readings on Checkout Menu DEMAND CONTROLLED FAN SPEED VENTILATION 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 64 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 65 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 66 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 67 ECONOMIZING DUAL ENTHALPY AVAILABLE HIGH LIMIT NOT AVAILABLE SINGLE ENTHALPY P2 (T,RH) (T,RH) TEMPERATURE Fig. 75 — 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 68: Pre-Start-Up/Start-Up
Clearing Alarms Proceed as follows to inspect and prepare the unit for initial Once the alarm has been identified and the cause has been re- start-up: moved (e.g. replaced faulty sensor) the alarm can be cleared Remove all access panels. from the display.
Page 69 COMPRESSOR MOUNTING Compressors are internally spring mounted. Do not loosen or WARNING remove 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 personal injury and/or property damage.
Page 70: Fastener Torque Values
Set system switch selector at HEAT position and fan FASTENER TORQUE VALUES switch at AUTO. or ON position. Set heating temperature lever above room temperature. Table 38 — Torque Values The induced-draft motor will start. After a call for heating, the main burners should light FASTENER LOCATIONS TORQUE VALUES within 5 seconds.
Page 71: Appendix A - Model Number Nomenclature
APPENDIX A — MODEL NUMBER NOMENCLATURE Position: 9 10 11 12 13 14 15 16 17 18 Example: Unit Heat Type Factory Assigned 48 - Gas Heat Packaged Rooftop 0 = Standard Electrical Options Model Series - WeatherMaster A = None HC - High Efficiency B = HACR Breaker C = Non-Fused Disconnect...
Page 72: Appendix B - Physical Data
APPENDIX B — PHYSICAL DATA Table A — PHYSICAL DATA (Cooling) 15 to 17.5 Tons 48HC*D17 48HC*E17 48HC*D20 48HC*E20 Refrigeration System # Circuits/# Comp./Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll R-410A charge A/B (lbs) 17/16.4 24.5/25.7...
Page 73 Table A — PHYSICAL DATA (Cooling) 15 to 17.5 Tons (cont) 48HC*D17 48HC*E17 48HC*D20 48HC*E20 HORIZONTAL Motor qty/Belt qty/Driver type 1 / 1 /Belt 1 / 1 /Belt 1 / 1 /Belt 1 / 1 /Belt Nominal nameplate H.P. Max BHP RPM range 514-680 514-680...
Page 74 Table B — PHYSICAL DATA (Cooling) 20 to 25 Tons 48HC*D24 48HC*E24 48HC*D28 48HC*E28 Refrigeration System # Circuits/# Comp./Type 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll 2 / 2 / Scroll R-410A charge A/B (lbs) 23.8/23.1 30.0/30.7 24.9/27.7...
Page 75 Table B — PHYSICAL DATA (Cooling) 20 to 25 Tons (cont) 48HC*D24 48HC*E24 48HC*D28 48HC*E28 HORIZONTAL Motor qty/Belt qty/Driver type 1 / 1 /Belt 1 / 1 /Belt Nominal nameplate H.P. Max BHP 6.5/ 6.9/ 7.0/ 8.3 6.5/ 6.9/ 7.0/ 8.3 RPM range 690-863 690-863...
Page 76: Appendix C - Fan Performance
APPENDIX C — FAN PERFORMANCE Table C — 48HCF*17 Horizontal Supply (15 Ton) AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 1.25 1.76 2.31 2.89 3.51 4500 1.51 2.05 2.64 3.26 3.91 4900 1.78 2.35 2.96 3.61 4.29 5250 2.13 2.73 3.37 4.05 4.76 5650...
Page 77 Table E — 48HCF*20 Horizontal Supply (17.5 Tons) AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 1.78 2.35 2.96 3.61 4.29 5250 2.17 2.78 3.43 4.11 4.82 5700 2.63 3.27 3.95 4.67 5.42 6150 3.09 3.76 4.48 5.23 6.01 6550 3.67 4.38 5.14 5.92 6.74...
Page 78 Table G — 48HCF*24 Horizontal Supply (20 Tons) AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 1.92 2.44 2.98 3.53 4.10 6000 2.34 2.90 3.48 4.07 4.67 6500 2.83 3.43 4.05 4.67 5.31 7000 3.39 4.03 4.68 5.35 6.03 7500 4.02 4.70 5.39 6.10 6.81...
Page 79 Table H — 48HCF*24 Vertical Supply (20 Tons) AVAILABLE EXTERNAL STATIC PRESSURE (IN. WG) 1.25 1.56 1.89 2.22 2.57 6000 1.52 1.87 2.21 2.57 2.94 6500 1.85 2.21 2.58 2.96 3.35 7000 2.21 2.60 3.00 3.40 3.81 7500 2.63 3.04 3.47 3.89 4.33...
Page 80 Table I — 48HCF*28 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 7.84 1071 8.63 9500 6.40...
Page 81 Table J — 48HCF*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 1039 5.55 1085 6.05 10000...
Page 82 Table L — Pulley Adjustment (Horizontal) - Fan RPM at Motor Pulley Settings MOTOR PULLEY TURNS OPEN MOTOR/DRIVE MODEL SIZE COMBO Standard Static Medium Static 3-phase High Static Standard Static Medium Static 3-phase High Static 1021 1002 Standard Static Medium Static 1021 1002 3-phase...
Page 83: Appendix D - Wiring Diagrams
APPENDIX D — WIRING DIAGRAMS Table M — Wiring Diagrams 48HC*D17-D28 UNITS DUAL CIRCUIT HUMIDI-MIZER ® SIZE VOLTAGE CONTROL POWER CONTROL POWER 208/230-3-60 50HE500889-L (page 85) 50HE502186-D (page 89) 460-3-60 50HE500752-L (page 86) 50HE502183-F (page 90) 575-3-60 50HE500888-L (page 87) 50HE502184-F (page 91) 208/230-3-60 50HE500889-L (page 85)
Page 84 Fig. B — 48HC D17 - D28 Control Diagram — 208/230-3-60; 460/575-3-60...
Page 85 Fig. C — 48HC D17 - D28 Power Diagram - 208/230-3-60...
Page 86 Fig. D — 48HC D17 - D28 Power Diagram - 460-3-60...
Page 87 Fig. E — 48HC D17 - D28 Power Diagram - 575-3-60...
Page 88 ® Fig. F — 48HC D17 - D28 Control Diagram with Humidi-MiZer System...
Page 89 ® Fig. G — 48HC D17 - D28 Power Diagram 208/230-3-60 with Humidi-MiZer System...
Page 90 ® Fig. H — 48HC D17 - D28 Power Diagram - 460-3-60 with Humidi-MiZer System...
Page 91 ® Fig. I — 48HC D17 - D28 Power Diagram - 575-3-60 with Humidi-MiZer System...
Page 92 50HE500891 F Fig. J — PremierLink™ System Control Wiring Diagram...
Page 93 ® Fig. K — PremierLink™ System Control Wiring Diagram with Humidi-MiZer System...
Page 94 Fig. L — RTU-OPEN Wiring Diagram...
Page 95 ® Fig. M — RTU-OPEN Wiring Diagram with Humidi-MiZer System...
Page 96: Appendix E - Motormaster Sensor
APPENDIX E — MOTORMASTER SENSOR LOCATIONS SENSOR LOCATION SENSOR LOCATION Fig. N — MotorMaster Sensor Locations for D17, D20, Fig. O — MotorMaster Sensor Locations - D28 and D24 Units...
Page 98 © Carrier Corporation 2020 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480242-01 Printed in U.S.A. Form 48HC-17-28-02SM Pg 98 2-2020 Replaces: 48HC-17-28-01SM...
Page 99: Start-Up Checklist
UNIT START-UP CHECKLIST (Remove and Store in Job File) 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 Service and Maintenance Instruction document.
Page 100 10. Restore set-points for thermostat and humidistat (Y/N) _____ REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS. © Carrier Corporation 2020 Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480242-01 Printed in U.S.A.

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