Bosch EC Series Installation, Operation And Maintenance Manual
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Bosch EC Series Installation, Operation And Maintenance Manual

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Installation, Operation, and Maintenance Manual
EC Series Heat Pumps
(R454B)
EC072 | EC096 | EC120 | EC150 | EC151 | EC180 | EC181 | EC210 | EC240 | EC242 | EC300 | EC360

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Summary of Contents for Bosch EC Series

  • Page 1 Installation, Operation, and Maintenance Manual EC Series Heat Pumps (R454B) EC072 | EC096 | EC120 | EC150 | EC151 | EC180 | EC181 | EC210 | EC240 | EC242 | EC300 | EC360...

  • Page 2: Table Of Contents

    Cooling Mode ..........31 Motor............62 13.2 Heating Mode ..........31 21 Wiring Diagrams for Three-Phase Units....... 63 14 Factory-Installed Options...........32 21.1 Two-Stage, Three-Phase Standard Unit with Belt- 14.1 Flow Proving Switch (DPS) ......32 Drive Motor..........63 EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 3 Blower Control) ..........79 21.18 Two-Stage, Three-Phase Unit with Dual-Point Power, DDC, Optional Components, and VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control) ..........80 22 Terminology..............81 22.1 Acronyms.............81 22.2 Terms............81 23 Check-Out Sheet ............82 24 Notes................83 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 4: Document Conventions

    Follow all safety codes. Wear safety glasses and work gloves. Use a quenching cloth for brazing, and place a fire extinguisher close to the work area. EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 5 Children should be supervised to ensure that they do not play with the appliance. EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 6 If a compressor is removed from this unit, refrigerant circuit oil will remain in the compressor. To avoid leakage of compressor oil, refrigerant lines of the compressor must be sealed after it is removed. EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 7: Model Nomenclature

    K — Fire Alarm Relay/Dual Power M — Wire to 208 Volts X — As Default for Non-Used Electrical Codes NOTE: Not all options are available on all models. Fig. 1 Model Nomenclature EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 8: General Description

    General Description NOTICE 3 General Description The EC Series Water-to-Air Heat Pumps provide the best For well water applications, 50*F minimum entering water combination of performance and efficiency available. Safety temperature (EWT) with sufficient flow is required to prevent devices are built into each unit to provide the maximum system freezing.

  • Page 9: Inspecting And Storing The Equipment

     freight bill. Concealed damage not discovered until after temperature of the job. removing the units from packaging must be reported to Bosch by Only remove the packaging when the unit is ready for  the original purchaser by filing a claim at: installation.

  • Page 10: Unit Installation

    Where access to side panels is limited, pre-removal of the control box side-mounting screws may be necessary for future servicing. NOTICE DO NOT use EC series units for temporary heating, air conditioning or ventilation during construction, especially NOTICE when plastering, sanding, or painting. Care should be taken to avoid introduction of dust, paint, or debris into the air coil.

  • Page 11: Minimum Conditioned Room Area

    (15.3 m 463.0 ft 417.7 ft 371.3 ft 334.2 ft 278.5 ft EC360 1419 2412 (14.0) (7.0) (43.0 m (38.8 m (34.5 m (31.0 m (25.9 m Table 3 Refrigerant Charge | 11 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 12: Protecting The Unit During Construction

    Plumbing connected to the heat pump must not come in direct condensate to flow away from the unit. contact with building structure or its components (such as joists, trusses, walls, etc.). 12 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 13: Duct System

    5.8 Duct System All EC Series models are provided with a supply air outlet collar and return air duct flange to facilitate duct connections. Never use flexible hoses of a smaller inside diameter than that A flexible duct connector is recommended for supply and return air duct connections on metal duct systems.
  • Page 14 See the unit specification sheets for the water flow and pressure 30°F, the leaving loop temperature would be 22°F to 25°F. drop information. Therefore, the freeze protection must be at 15°F (30°F-15°F=15°F). 14 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 15: Electrical-Power Supply Wiring

    Power to the unit must be within the operating voltage range indicated on the unit’s nameplate or on the performance data Electric Code as well as all applicable local codes. sheet. | 15 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 16: Electrical-Low-Voltage Wiring

    208-V power supply, the primary leads on the unit transformer will need to be changed from 240-V to 208- V. Table 4 Thermostat Connection Options Refer to the unit wiring diagrams starting on page #57. 16 | EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 17 20 AWG (0,50mm voltage, erratic unit operation, or damage to the heat pump. 385 ft. (117m) 18 AWG (0,75mm Table 5 Length by Wire Gauge for Thermostat to HVAC Equipment Wiring | 17 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 18: Charging The Refrigeration Circuits (For Units With Take-Apart Construction Only)

    DANGER Poisonous Gas Poisonous gas can be created when refrigerant (R454B) is exposed to open flames. 18 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 19: Specific Application Considerations

    [1] Flex Duct Connection [2] Solenoid Valve, Slow Closing [3] Pressure Tank (optional) [4] Ball Valves [5] Condensate Drain Connection [6] P/T Ports (optional) [7] Line Voltage Connection [8] Low-Voltage Control Connection | 19 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 20: Cooling Tower/Boiler Systems

    Fig. 7 Typical Cooling Tower and Boiler System Setup [1] Supply and Return Line of Central System [6] Flex Duct Connection [2] Ball Valves [3] Hose Kits (optional) [4] Line-Voltage Control Connection [5] Low-Voltage Control Connection 20 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 21: Water-Quality Considerations

    Fouling due to iron bacteria can also pose problems in some open loop installations. Iron bacteria fouling can quickly degrade system performance and plug heat exchangers. Air in the water system will greatly accelerate the fouling or corrosion process. | 21 EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 22 < 10 ppm, < 600 µm size** Erosion Maximum Water Velocity 6 ft/sec 6 ft/sec * No "rotten egg" smell present at < 0.5 ppm H ** Equivalent to 30 mesh strainer Table 8 Water Quality 22 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 23: Post-Installation System Checkout

    9.2 Checking Scroll Compressor Rotation This equipment is designed for indoor installation only. Extreme Scroll compressors, like the ones used on the EC series, are variations in temperature, humidity, and corrosive water or air phase sensitive. When out of phase, the compressors will run in will adversely affect the unit performance, reliability and service reverse.

  • Page 24: Start-Up

    2. Slowly turn the thermostat to a higher temperature until the compressor activates. 3. Check for warm air delivery at the unit grille within a few minutes after the unit has begun to operate. 24 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 25: Safety Devices And The Upm Controller Overview

    [6] LED Status Indicator (Fault Status) [7] Air Coil Freeze Connection (FREEZE 2) [8] Condensate Overflow Sensor [9] Ground Connection [10] UPM Board Settings DIP Switch [11] A2L Sensor [12] 24VAC Power Common | 25 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 26: Second-Stage Upm Board

    [9] UPM Board Settings DIP Switch [10] A2L Sensor [11] 24VAC Power Common [12] 24VAC Power Input [13] UPM Standoff [14] Power LED [15] Fan (Fan in the event of an A2L leakage) 26 | EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 27 Fig. 10 Waterside Freeze Protection Sensor Location Fig. 12 Condensate Overflow Protection Sensor • Air coil freeze protection sensors are mounted close to evaporator coil between the thermal expansion valve and evaporator coil. (Refer to Fig. 11.) | 27 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 28: Upm Default Settings And Dip Switch Positions

    When DIP switch position “7” for pump function is set to ON, it allows the loop pump to run for 30 seconds before starting the compressor when the UPM has not received a Y call in over 8 hours. 28 | EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 29 Table 10 UPM Fault Blink Codes If both UPM boards are flashing fault codes, the flashes will not be synchronized. Make sure to count the flashes on each UPM board to know what each are signaling. | 29 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 30: Leak Detection System

    The Leak Detection System requires that the unit remains OFF the unit in the event that water in the drain pan powered except when servicing. surpasses the acceptable limit. Once water touches the pin 30 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 31: Unit Sequence Of Operation By Mode

    Once the thermostat is satisfied, the compressor shuts down and the fan ramps down to either fan-only mode or OFF over a span of 30 seconds. | 31 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 32: Factory-Installed Options

    You should choose the means that best suits your specific application. The Typical Wiring Diagram illustrates one possible A number of options are available on EC Series of Heat Pumps. control sequence. Most heat pump compatible thermostats in The following details the purpose, function, and components of conjunction with a humidistat are acceptable for use.

  • Page 33: Hot Gas Bypass

    OFF the compressor if it senses the suction pressure is too high. heat pump. 14.8 Economizer EC series heat pumps can be provided an optional waterside economizer. The waterside economizer option allows a cooling demand to be satisfied by circulating cold water through a...

  • Page 34: Maintenance

    15.4 Blower Motor Lubrication (Optional) Lubrication of the blower motor is not required; however, may be performed on some motors to extend motor life. Use SAE-20 non-detergent electric motor oil. 34 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 35: Pulley Alignment And Belt Tensioning Procedure

    Using a gauge, apply 4 lb of force to the center of the belt and adjust the tension until a deflection of 1/64-in. is achieved for every inch of shaft center distance. (Refer to Fig. 15.) | 35 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 36: Servicing And Repair Information

    All work must be undertaken under a controlled procedure to manufacturer's maintenance and service guidelines must be minimize the risk of a flammable gas or vapor being present while followed. If in doubt, consult Bosch service and support for the work is being performed. assistance.

  • Page 37: Checks To Electrical Devices

    This process might The following leak-detection methods are deemed acceptable for need to be repeated several times. Compressed air or oxygen all refrigerant systems: must not be used for purging refrigerant systems. | 37 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 38: Charging Procedures

    ( i.e. , special cylinders for the recovery of refrigerant). Ensure all cylinders are complete with a pressure-relief valve  and associated shut-off valves that are all in good working order. 38 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 39: Decommissioning Information

    Equipment must be labeled stating that it has been  decommissioned and emptied of refrigerant. The label must be dated and signed.  Ensure that there are labels on the equipment stating the  equipment contains flammable refrigerant. | 39 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 40: Troubleshooting

    “R” and “C,” “Y” and “C,” and “O” and “C”. If the blower does not operate, verify 24 volts between terminals “G” and “C” in the air handler. Replace the thermostat if defective. 40 | EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 41 Thermostat/ Thermostat was installed near a supply air grill; relocate thermostat. Readjust heat anticipator. Unit short cycles Controller (DDC) Wiring and Check for a defective or improperly calibrated low-pressure switch. Controls | 41 EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 42 Check to see if sensor is not attached securely to line. temperature Switch is Closed Scaled or Fouled Clean the heat exchanger. Low heat output Heat Exchanger Table 12 Unit Troubleshooting 42 | EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 43 Is the Fault LED blinking four (4) If Yes, Circuit 2 is Low-pressure fault—Low Check the refrigerant pressure times on the 1 & affected. refrigerant. with a gauge set. stage UPMs? | 43 EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 44 1 & blockage. stage UPMs? Condensate fault—Blocked • Check that there is adequate return air. space between the return air opening and the walls or other obstructions on free return applications. 44 | EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 45 1 & refrigerant leaked. #26.) stage UPMs? Check that the harness is connected from the A2L sensor side. Check if there are any hissing or gurgling noises in the system. | 45 EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 46 No compressor Cooling or between the UPM 1 & UPM operation Heating times on the 1 & both the 1 and 2 stage UPMs. stages. stage UPMs? Table 13 Compressor Troubleshooting 46 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 47: Specification Tables

    3.57 1031 3.79 1069 4.02 6,000 3.17 3.40 3.64 3.88 1002 4.11 1039 4.35 1076 4.59 1111 4.84 6,500 3.96 4.22 4.47 1015 4.73 1051 4.98 1087 5.24 1121 1155 5.76 | 47 EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 48 828 6.19 870 6.66 912 7.14 951 7.61 990 8.08 1028 8.56 12,500 857 6.94 898 7.43 938 7.92 977 8.41 1014 8.91 13,000 887 7.74 926 8.26 965 8.77 13,500 916 8.60 Table 14 Blower Performance Table 48 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 49: Operating Temperatures And Pressures Table

    17–20 44–53 90° 22.0 106–133 313–385 10–11 19–24 165–204 395–488 11–13 47–57 13.0 108–137 376–459 15–17 19–23 — — — — 100° 22.0 108–135 357–436 9–11 19–23 — — — — | 49 EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 50 15–17 35–40 90° 38.0 110–142 318–391 9–10 17–21 157–192 334–407 10–11 38–44 22.0 112–146 377–465 14–17 17–20 — — — — 100° 38.0 112–145 360–442 9–10 16–20 — — — — 50 | EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 51 13–16 32–39 90° 45.0 110–139 322–395 7–10 16–20 152–182 330–404 8–10 35–42 25.0 111–142 383–471 14–18 15–19 — — — — 100° 45.0 111–141 365–447 8–10 16–20 — — — — | 51 EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 52 18–21 39–46 90° 52.0 106–137 255–332 8–11 17–21 169–203 368–450 10–12 42–49 28.0 108–142 305–398 14–19 17–20 — — — — 100° 52.0 108–140 293–379 7–10 17–21 — — — — 52 | EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 53 17–20 40–48 90° 64.0 107–134 303–374 8–10 17–21 169–203 388–475 9–11 44–52 32.0 110–139 372–456 17–20 16–20 — — — — 100° 64.0 110–137 347–426 8–10 16–20 — — — — | 53 EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 54 17–21 161–195 400–487 9–11 43–51 45.0 102–132 307–398 13–16 16–20 — — — — 100° 75.0 102–131 297–382 8–10 16–20 — — — — Table 15 Operating Temperatures and Pressures Table 54 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 55: Water-Side Pressure Drop Table

    Water-Side Pressure Drop (PSIG) Rate (GPM) EC072 11.0 14.0 17.3 EC096 11.8 15.6 19.8 EC120 10.1 13.3 16.9 EC150 17.1 EC151 17.1 EC180 12.5 18.4 EC181 12.5 18.4 EC210 14.9 20.6 11.8 27.2 | 55 EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 56 Model Water-Side Pressure Drop (PSIG) Rate (GPM) EC240 12.9 19.2 EC242 12.9 19.2 EC300 12.9 19.2 10.4 24.1 15.5 EC360 19.7 10.6 24.4 12.8 29.5 Table 16 Water-Side Pressure Drop Table 56 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 57: Wiring Diagrams For Single-Phase Units

    20.1 Two-Stage, Single-Phase Standard Unit with Belt-Drive Motor Fig. 16 Two-Stage, Single-Phase Standard Unit with Belt-Drive Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. | 57 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 58: Two-Stage, Single-Phase Unit With Optional Components And Belt-Drive Motor

    Fig. 17 Two-Stage, Single-Phase Unit with Optional Components and Belt-Drive Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 58 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 59: Two-Stage, Single-Phase Unit With Ddc, Optional Components, And Belt-Drive Motor

    Fig. 18 Two-Stage, Single-Phase Unit with DDC, Optional Components, and Belt-Drive Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. | 59 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 60: Two-Stage, Single-Phase Unit With Dual-Point Power And Belt-Drive Motor

    Fig. 19 Two-Stage, Single-Phase Unit with Dual-Point and Belt-Drive Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 60 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 61: Two-Stage, Single-Phase Unit With Dual-Point Power, Optional Components, And Belt-Drive Motor

    Fig. 20 Two-Stage, Single-Phase Unit with Dual-Point Power, Optional Components, and Belt-Drive Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. | 61 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 62: Two-Stage, Single-Phase Unit With Dual-Point Power, Ddc, Optional Components, And Belt-Drive Motor

    Fig. 21 Two-Stage, Single-Phase Unit with Dual-Point Power, DDC, Optional Components, and Belt-Drive Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 62 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 63: Wiring Diagrams For Three-Phase Units

    21.1 Two-Stage, Three-Phase Standard Unit with Belt-Drive Motor Fig. 22 Two-Stage, Three-Phase Standard Unit with Belt-Drive Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. | 63 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 64: Two-Stage, Three-Phase Unit With Optional Components (Mhgr) And Belt-Drive Motor

    Fig. 23 Two-Stage, Three-Phase Unit with Optional Components (MHGR) and Belt-Drive Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 64 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 65: Two-Stage, Three-Phase Unit With Ddc, Optional Components, And Belt-Drive Motor

    Fig. 24 Two-Stage, Three-Phase Unit with DDC, Optional Components, and Belt-Drive Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. | 65 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 66: Two-Stage, Three-Phase Standard Unit With Dual-Point Power And Belt-Drive Motor

    Fig. 25 Two-Stage, Three-Phase Standard Unit with Dual-Point Power and Belt-Drive Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 66 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 67: Two-Stage, Three-Phase Unit With Dual-Point Power, Optional Components (Mhgr), And Belt-Drive Motor

    Fig. 26 Two-Stage, Three-Phase Unit with Dual-Point Power, Optional Components (MHGR), and Belt-Drive Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. | 67 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 68: Two-Stage, Three-Phase Unit With Dual-Point Power, Ddc, Optional Components, And Belt-Drive Motor

    Fig. 27 Two-Stage, Three-Phase Unit with Dual-Point Power, DDC, Optional Components, and Belt-Drive Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 68 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 69: Two-Stage, Three-Phase Standard Unit With Vfd Inverter-Duty Motor

    Fig. 28 Two-Stage, Three-Phase Standard Unit with VFD Inverter-Duty Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. | 69 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 70: Two-Stage, Three-Phase Unit With Optional Components (Mhgr) And Vfd Inverter-Duty Motor

    Fig. 29 Two-Stage, Three-Phase Unit with Optional Components (MHGR) and VFD Inverter-Duty Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 70 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 71: Two-Stage, Three-Phase Unit With Ddc, Optional Components, And Vfd Inverter-Duty Motor

    Fig. 30 Two-Stage, Three-Phase Unit with DDC, Optional Components, and VFD Inverter-Duty Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. | 71 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 72: Two-Stage, Three-Phase Standard Unit With Dual-Point Power And Vfd Inverter-Duty Motor

    Fig. 31 Two-Stage, Three-Phase Standard Unit with Dual-Point Power and VFD Inverter-Duty Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 72 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 73: Two-Stage, Three-Phase Unit With Dual-Point Power, Optional Components (Mhgr), And Vfd Inverter-Duty Motor

    Fig. 32 Two-Stage, Three-Phase Unit with Dual-Point Power, Optional Components (MHGR), and VFD Inverter-Duty Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. | 73 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 74: Two-Stage, Three-Phase Unit With Dual-Point Power, Optional Components, And Vfd Inverter-Duty Motor

    Fig. 33 Two-Stage, Three-Phase Unit with Dual-Point Power, Optional Components, and VFD Inverter-Duty Motor FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 74 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 75: Two-Stage, Three-Phase Standard Unit With Vfd Inverter-Duty Motor (Ready For Field-Installed Blower Control)

    Fig. 34 Two-Stage, Three-Phase Standard Unit with VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control) FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. | 75 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 76: Two-Stage, Three-Phase Unit With Optional Components (Mhgr) And Vfd Inverter-Duty Motor (Ready For Field-Installed Blower Control)

    Fig. 35 Two-Stage, Three-Phase Unit with Optional Components (MHGR) and VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control) FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 76 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 77: Two-Stage, Three-Phase Unit With Ddc, Optional Components, And Vfd Inverter-Duty Motor (Ready For Field-Installed Blower Control)

    Fig. 36 Two-Stage, Three-Phase Unit with DDC, Optional Components, and VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control) FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. | 77 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 78: Two-Stage, Three-Phase Standard Unit With Dual-Point Power And Vfd Inverter-Duty Motor (Ready For Field-Installed Blower Control)

    Fig. 37 Two-Stage, Three-Phase Standard Unit with Dual-Point Power and VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control) FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 78 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 79: Two-Stage, Three-Phase Unit With Dual-Point Power, Optional Components (Mhgr), And Vfd Inverter-Duty Motor (Ready For Field-Installed Blower Control)

    Fig. 38 Two-Stage, Three-Phase Unit with Dual-Point Power, Optional Components (MHGR), and VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control) FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. | 79 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 80: Two-Stage, Three-Phase Unit With Dual-Point Power, Ddc, Optional Components, And Vfd Inverter-Duty Motor (Ready For Field-Installed Blower Control)

    Fig. 39 Two-Stage, Three-Phase Unit with Dual-Point Power, DDC, Optional Components, and VFD Inverter-Duty Motor (Ready for Field-Installed Blower Control) FOR REFERENCE ONLY. Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 80 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 81: Terminology

    Decommissioning — Means the final shut-down and removal from operation or usage of a product or piece of equipment containing fluorinated greenhouse gases. Discharge Pressure — Referring to the pressure leaving compressor. | 81 EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 82: Check-Out Sheet

    Source Fluid Type: Fluid Flow (gpm)*: Fluid-Side Pressure Drop*: Suction Pressure (psig)*: Discharge Pressure (psig)*: Suction Temperature*: Discharge Temperature*: Suction Superheat*: Entering TXV/Cap Tube Temperature*: Liquid Subcooling*: * Required for Troubleshooting ONLY 82 | EC Series Heat Pumps — 8733841499 (2024/05)

  • Page 83: Notes

    Notes 24 Notes | 83 EC Series Heat Pumps — 8733841499 (2024/05)
  • Page 84 Additional Product Information Page Watertown, MA 02472 To see additional product information and documentation, please visit the product page: www.bosch-homecomfort.com/us/ or scan the QR code below. Tel: +1 (800) 283-3787 Fax: +1 (603) 965-7568 8733841499 | Revised 05/2024 Bosch Thermotechnology Corp. reserves the right to make changes without notice due to continuing engineering and technological advances.

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