Bosch TW Series Installation, Operation And Maintenance Manual

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Installation, Operation, and Maintenance Manual

TW Series Heat Pumps

TW025 | TW035 | TW049 | TW061 | TW122

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Summary of Contents for Bosch TW Series

Page 1 Installation, Operation, and Maintenance Manual TW Series Heat Pumps TW025 | TW035 | TW049 | TW061 | TW122...
Page 2 Installation, Operation, and Maintenance Manual TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 3 21.7 Repair to Intrinsically Safe Components Pre-Start-Up 21.8 Check Cabling 12.1 Check for Correct Compressor Rotation 21.9 Detection of Flammable Refrigerants 21.10 Removal and Evacuation Start-up 21.11 Charging Procedures 13.1 Unit Start Up Cooling Mode 21.12 Recovery TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 4 24.5.4 TW122, Remote Controller, Standard 24.6 Dimensional Drawings TW025-061 24.6.1 Overall Dimensions TW025-122 24.6.2 Detailed Dimensions TW025-061 24.7 Dimensional Drawings TW122 24.7.1 Detailed Dimensions TW122 Terminology 25.1 Acronyms 25.2 Terms Check-Out Sheet TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 5 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. TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 6 To avoid leakage of compressor oil, refrigerant lines of the compressor must be sealed after it is removed. TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 7 A — EMS relay E — Pump/valve relay H — Flow proving switch L — A2L Sensor REFRIGERATION CIRCUIT OPTIONS: X — None D — Heat Recovery Package Figure 1 Model Nomenclature TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 8 [1] TW Series Water-to-Water [2] Installation and Operation Manual General Description TW series water-to-water heat pumps provide the best combination of performance and efficiency available. All units are performance certified to American Heating and Refrigeration Institute (AHRI) ISO Standard 13256-2. All TW water-to-water heat pumps conform to UL60335-2-40 standard and are certified by Intertek-ETL.
Page 9 Maximum and minimum operating limits may not be combined. If one value is at either maximum or minimum, the other value(s) must be within normal operating range. Refer to Engineer Submittal Sheet on the product information page. ACRONYMS: LWT: Leaving Water Temperature EWT: Entering Water Temperature Table 1 Operating Limits TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 10 Units to Bosch by the original purchaser by filing a claim at: https://claims.bosch- must only be stored or moved in the normal upright position at all times.
Page 11 Installation The TW series unit must be mounted level on a vibration absorbing pad slightly larger than the base to minimize vibration transmission to the building structure, It is not necessary to anchor the unit to the floor. (See Figure 3)
Page 12 When the refrigerant leak detection system is installed, the unit must be powered 5,249 1,600 1.12 except when servicing. 5,905 1,800 1.15 6,561 2,000 1.18 Table 4 Altitude Adjustment Factor 12 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 13 All field wiring must be installed by qualified and trained personnel. Refer to the unit’s wiring diagram for field connection. TW Series Heat Pumps - 8733852843 (2025/06) US | 13...
Page 14 The reversing valve on the TW series is energized when the unit is in cooling mode. The unit is provided with concentric knockouts for attaching common trade sizes of conduit.
Page 15 Maximum Wire Length 22 AWG (0,33mm2) 150 ft. (46m) 20 AWG (0,50mm2) 240 ft. (73m) 18 AWG (0,75mm2) 385 ft. (117m) Table 8 Thermostat to HVAC Equipment Wiring Maximum Wire Length TW Series Heat Pumps - 8733852843 (2025/06) US | 15...
Page 16 Figure 4 Typical Well Water Setup [1] Pressure Tank [2] Ball Valves [3] Solenoid Valve [4] Hose Kit [5] P/T Kit [6] Load-Side Connections [7] Low-Voltage Control Connection [8] Vibration Pad [9] Line-Voltage Control Connection 16 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 17 [1] Ball Valves [2] Hose Kits [3] P/T Plugs [4] Load-Side Connections [5] Low-Voltage Control Connections [6] Vibration Pad [7] Line-Voltage Disconnect [8] Supply and Return Line of Central System TW Series Heat Pumps - 8733852843 (2025/06) US | 17...
Page 18 [1] Polybutylene or Polyethelene with insulation [2] Ground loop pumping package (GLP) [3] Ground loop connection kit [4] P/T ports [5] Load-side connection [6] Low-voltage control connection [7] Vibration pad [8] Line voltage disconnect 18 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 19 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. TW Series Heat Pumps - 8733852843 (2025/06) US | 19...
Page 20 < 10 ppm, < 600 µm size ** Erosion Maximum Water Velocity 6 ft/sec 6 ft/sec * No “rotten egg” smell present at < 0.5 ppm H2S. ** Equivalent to 30 mesh strainer Table 9 Water Quality 20 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 21 Record all system vitals using the “checkout sheet” and keep with equipment. (See page 69.) There is a time delay before the compressor will start. TW Series Heat Pumps - 8733852843 (2025/06) US | 21...
Page 22 When a malfunction light is used for diagnostic purposes, the connection is made at [11] A2L Sensor the dry contact connection terminals of the UPM board. [12] 24VAC Power Common 22 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 23 [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) TW Series Heat Pumps - 8733852843 (2025/06) US | 23...
Page 24 Freeze 1 set to 25°F (DIP Switch SW1 set to OFF) in order to shut down the unit at the appropriate leaving water temperature and protect your heat pump from freezing if a freeze sensor is included. 24 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 25 270 to 300 seconds on initial power up to reduce the chance of multiple unit simultaneously starting at the same time after power up or after a power interruption, in order to avoid creating a large electrical spike. TW Series Heat Pumps - 8733852843 (2025/06) US | 25...
Page 26 115 (+/- 9 ). One single hot °F °F water switch can be used for both single and dual circuit units. 26 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 27 Installation, Operation, and Maintenance Manual 15.4 UPM Sequence of Operation CLEAR FAULTS Figure 11 UPM Sequence of Operation Flowchart TW Series Heat Pumps - 8733852843 (2025/06) US | 27...
Page 28 Y1 closes, and the unit operates (first stage compressor in a two-stage unit). When the set point is satisfied, The Bosch water heat pump controller provides an economical and straightforward the compressor turns off. In a two-stage unit, if the water temperature drops solution for managing a water-to-water heat pump unit.
Page 29 When pressed with the up arrow for 5- seconds, the control will display the current temperature scale (Fahrenheit or Celsius). • Can be used to change the settings for: temperature scale, dead band, test mode, initial delay, compressor, pump, and malfunction settings. TW Series Heat Pumps - 8733852843 (2025/06) US | 29...
Page 30 1°F and can be adjusted from 1°F to 10°F at startup. The differential setting represents the difference between the set point temperature and the actual on/off temperature of the machine. 30 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 31 Lead/lag setting on the TW122 can be adjusted from 0 to 14 days for compressor rotation sequence. This must be set to 0 for all other sizes. Select using the up and down arrows. Press the "mode" key to advance. • Setting: ______________________ TW Series Heat Pumps - 8733852843 (2025/06) US | 31...
Page 32 The pump circulates water A number of options are available on TW Series of Heat Pumps. The following between the domestic hot water tank and HRP heat exchanger in the Heat Pump.
Page 33 Diagram is for illustration purposes only. Ensure access to Heat Pump is not All piping from HRP to domestic water tank must be copper or any metal suitable restricted. for domestic water. TW Series Heat Pumps - 8733852843 (2025/06) US | 33...
Page 34 4. Allow the unit to operate for 20 to 30 minutes to ensure it is functioning properly. The pump will shut off when the Heat Recovery entering water temperature reaches 120°F. 34 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 35 The ventilation must safely disperse all released refrigerant, preferably expelling it externally into the atmosphere. The ventilation must be present during the period that the work is carried out. TW Series Heat Pumps - 8733852843 (2025/06) US | 35...
Page 36 At all times the manufacturer's maintenance and for or detection of refrigerant leaks. A halide torch (or any other detector using a service guidelines must be followed. If in doubt, consult Bosch service and support naked flame) must NOT be used.
Page 37 The compressor body must NOT be heated by an open flame or other ignition sources to accelerate this process. When oil is drained from a system, it must be carried out safely. TW Series Heat Pumps - 8733852843 (2025/06) US | 37...
Page 38 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. 38 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 39 Check for defective or improperly calibrated low-pressure switch. Visually inspect Low-pressure switch malfunction switch and wiring for any signs of damage, corrosion, or loose connections. Repair or replace any damaged components. Table 16 Single Stage UPM Troubleshooting TW Series Heat Pumps - 8733852843 (2025/06) US | 39...
Page 40 Conduct a thorough inspection of the refrigerant system to identify any leaks. 7 blinks refrigerant leak. A2L Fault on UPM A2L sensor malfunction. Inspect the sensor and wiring for damage, corrosion, or loose connections. Table 16 (Continued) 40 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 41 Check for defective or improperly calibrated high-pressure switch. Visually inspect switch High-pressure and wiring for any signs of damage, corrosion, or loose connections. Repair or replace any switch malfunction. damaged components. Table 17 Two-Stage UPM Troubleshooting TW Series Heat Pumps - 8733852843 (2025/06) US | 41...
Page 42 VA draw shown in Table 7. Bad thermostat connection Inspect thermostat wiring for damage. Ensure it is the correct gauge and length, and that no connections are loose. Table 17 (Continued) 42 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 43 Inspect the sensor and wiring for damage, corrosion, or loose connections. malfunction. Lost communi- Second-stage 12 blinks on cation with the Communication Inspect all electrical wiring and check for loose connections. second-stage Fault UPM board Table 17 (Continued) TW Series Heat Pumps - 8733852843 (2025/06) US | 43...
Page 44 Low refrigerant Check refrigerant pressures with a gauge set. Inspect unit for leaks. tion capacity Table 18 Unit Troubleshooting 44 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 45 Increase water flow rate and/or reduce water temperature if possible. noise Scaled or fouled water coil elevat- ing head pressure Clean/descale water coil. Water hammer Fast-closing valves installed Change valves to slow-close type. Table 18 (Continued) TW Series Heat Pumps - 8733852843 (2025/06) US | 45...
Page 46 395-415 114-124 427-447 124-134 14-16 11-13 404-424 134-144 437-457 141-151 15-17 12-14 413-433 156-166 8-10 453-473 172-182 17-19 14-16 418-438 175-185 9-11 Table 19 TW025 Operating Temperatures and Pressures, Cooling 46 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 47 18-20 20-22 290-310 176-186 9-11 11-13 409-429 169-179 16-18 19-21 374-394 181-191 9-11 10-12 504-524 174-184 15-17 18-20 470-490 191-201 8-10 10-12 Table 20 TW025 Operating Temperatures and Pressures, Heating TW Series Heat Pumps - 8733852843 (2025/06) US | 47...
Page 48 115-125 17-19 13-15 430-450 129-139 9-11 467-487 134-144 19-21 15-17 436-456 151-161 10-12 8-10 479-499 154-164 21-23 17-19 442-462 175-185 11-13 9-11 Table 21 TW035 Operating Temperatures and Pressures, Cooling 48 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 49 20-22 24-26 308-328 160-170 12-14 13-15 433-453 144-154 19-21 23-25 390-410 163-173 11-13 13-15 534-554 150-160 18-20 22-24 491-511 167-177 10-12 12-14 Table 22 TW035 Operating Temperatures and Pressures, Heating TW Series Heat Pumps - 8733852843 (2025/06) US | 49...
Page 50 432-452 114-124 16-18 12-14 403-423 118-128 8-10 444-464 134-144 18-20 14-16 408-428 136-146 9-11 454-474 155-165 21-23 17-19 417-437 172-182 11-13 9-11 Table 23 TW049 Operating Temperatures and Pressures, Cooling 50 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 51 21-23 24-26 293-313 144-154 12-14 13-15 414-434 132-142 19-21 23-25 376-396 152-162 11-13 13-15 518-538 142-152 18-20 23-25 475-495 157-167 10-12 12-14 Table 24 TW049 Operating Temperatures and Pressures, Heating TW Series Heat Pumps - 8733852843 (2025/06) US | 51...
Page 52 18-20 14-16 413-433 114-124 10-12 8-10 456-476 119-129 21-23 16-18 419-439 133-143 11-13 9-11 468-488 137-147 23-25 18-20 428-448 157-167 13-15 10-12 Table 25 TW061 Operating Temperatures and Pressures, Cooling 52 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 53 22-24 26-28 303-323 127-137 13-15 15-17 427-447 117-127 21-23 26-28 385-405 131-141 12-14 14-16 529-549 122-132 19-21 25-27 484-504 138-148 11-13 14-16 Table 26 TW061 Operating Temperatures and Pressures, Heating TW Series Heat Pumps - 8733852843 (2025/06) US | 53...
Page 54 406-426 106-116 8-10 391-411 113-123 411-431 125-135 9-11 395-415 134-144 418-438 147-157 11-13 9-11 399-419 158-168 425-445 170-180 12-14 10-12 404-424 184-194 Table 27 TW122 Operating Temperatures and Pressures, Cooling 54 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 55 12-14 14-16 210-230 155-165 293-313 144-154 11-13 13-15 274-294 156-166 376-396 151-161 11-13 13-15 354-374 159-169 474-494 152-162 9-11 12-14 452-472 162-172 Table 28 TW122 Operating Temperatures and Pressures, Heating TW Series Heat Pumps - 8733852843 (2025/06) US | 55...
Page 56 1.47 45/370 8-733-968-403 YAS30K1EPFV TW049 208-230/60/1 0.44 1.66 40/440 8-733-968-406 YAS40K1EPFV TW061 208-230/60/1 0.35 1.39 40/440 8-733-968-407 YAS51K1EPFV TW122 208-230/60/1 0.35 1.39 40/440 8-733-968-407 YAS51K1EPFV Table 30 TW Compressor Characteristics 56 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 57 Table 31 Model 24 Thermistor (Freeze Sensor) Test Values 22.76K 19.90K 17.44K 15.31K 13.48K 11.88K 10.50K 9298 8250 7331 6532 5826 5209 4663 4182 3757 3381 3047 2750 2486 2251 2041 1854 1686 TW Series Heat Pumps - 8733852843 (2025/06) US | 57...
Page 58 Installation, Operation, and Maintenance Manual 24.5 Wiring Diagrams 24.5.1 TW025-061, Unit Mounted Controller, Standard Figure 14 TW025-061, Unit Mounted Controller, Standard 58 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 59 Installation, Operation, and Maintenance Manual 24.5.2 TW025-061, Remote Controller, Standard Figure 15 TW025-061, Remote Controller, Standard TW Series Heat Pumps - 8733852843 (2025/06) US | 59...
Page 60 Installation, Operation, and Maintenance Manual 24.5.3 TW122, Unit Mounted Controller, Standard Figure 16 TW122, Unit Mounted Controller, Standard 60 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 61 Installation, Operation, and Maintenance Manual 24.5.4 TW122, Remote Controller, Standard Figure 17 TW122, Remote Controller, Standard TW Series Heat Pumps - 8733852843 (2025/06) US | 61...
Page 62 Installation, Operation, and Maintenance Manual 24.6 Dimensional Drawings TW025-061 Unit front Left side Fan Location Figure 18 TW025-061 Dimensions | 35 62 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 63 HRP Connection 1/2 FPT 1/2 FPT 1/2 FPT 1/2 FPT NOTES: All dimensions within +/- 0.125". Dimensions are in inches. Specifications subject to change without notice. Table 33 TW025-061 Detailed Dimensions TW Series Heat Pumps - 8733852843 (2025/06) US | 63...
Page 64 Installation, Operation, and Maintenance Manual Figure 19 Service Cleareance, TW025-061 64 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 65 Side Bottom Bottom Location Side to Side to Side to to Source to Source Depth Width Depth Location Load Load Load Source Source Bottom Load From Width of Unit Back TW Series Heat Pumps - 8733852843 (2025/06) US | 65...
Page 66 4.15 Fan Location Width 10.51 Water Connections 1-1/4" FPT NOTES: All dimensions within +/- 0.125". Dimensions are in inches. Specifications subject to change without notice. Table 34 TW122 Detailed Dimensions 66 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 67 Installation, Operation, and Maintenance Manual Figure 21 Service Clearance, TW122 TW Series Heat Pumps - 8733852843 (2025/06) US | 67...
Page 68 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. 68 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 69 Discharge Pressure (psig)*: ____________________________________________________________________ ____________________________________________________________________ Suction Temperature*: ____________________________________________________________________ ____________________________________________________________________ Discharge Temperature*: ____________________________________________________________________ ____________________________________________________________________ Suction Superheat*: ____________________________________________________________________ ____________________________________________________________________ Entering TXV/Cap Tube Temperature*: ____________________________________________________________________ ____________________________________________________________________ Liquid Subcooling*: ____________________________________________________________________ ____________________________________________________________________ * Required for Troubleshooting ONLY TW Series Heat Pumps - 8733852843 (2025/06) US | 69...
Page 70 Installation, Operation, and Maintenance Manual NOTES: 70 | TW Series Heat Pumps - 8733852843 (2025/06) US...
Page 71 Installation, Operation, and Maintenance Manual NOTES: TW Series Heat Pumps - 8733852843 (2025/06) US | 71...
Page 72 8733852843/ (2025/06) US To see additional product information and documentation, please visit the product page: Bosch Thermotechnology Corp. reserves the right to www.bosch-homecomfort.com/us/ or scan the QR code below. make changes without notice due to continuing engineering and technological advances.

This manual is also suitable for:

Tw025 Tw035 Tw049 Tw061 Tw122