Related Manuals for Bosch CA Series
Summary of Contents for Bosch CA Series
- Page 1 Installation, Operation, and Maintenance Manual CA Series Heat Pumps (R454B) CA009 | CA012 | CA015 | CA018...
- Page 2 Installation, Operation, and Maintenance Manual CA Series Heat Pumps - 8733851021 (2025/04) US...
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Page 3: Table Of Contents
28.1 Acronyms 15.1 Unit Start Up Cooling Mode 28.2 Terms 15.2 Unit Start Up Heating Mode 29 Check-Out Sheet 16 Commissioning 17 Maintenance 17.1 Filter Cleaning 17.2 Annual Checkup 17.3 Annual Condensate Drain Cleaning CA Series Heat Pumps -8733851021 (2025/04) US... -
Page 4: Document Conventions
Use a quenching cloth for brazing, and place a fire extinguisher close to the work area. The info symbol indicates important information where there is no risk to property or people. CA Series Heat Pumps - 8733851021 (2025/04) US... -
Page 5: Refrigerant Safety Warnings
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. CA Series Heat Pumps -8733851021 (2025/04) US... -
Page 6: Model Nomenclature
J — Disconnect Switch M — Wire to 208 V O — Outside Air Damper X — As default for non used electrical codes REFRIGERATION CIRCUIT OPTIONS: X — None Figure 1 CA Series Heat Pumps - 8733851021 (2025/04) US... -
Page 7: General Description
Installation, Operation, and Maintenance Manual 3 General Description CA series water-to-air heat pumps are designed for use as decentralized room terminals that are field connected to a closed-circuit piping loop within a structure. Typically these units are installed in perimeter zones and are ideal for installations where ducted systems are impractical. - Page 8 Note: Maximum and minimum operating limits may not be combined. Refer to Engineer Submittal Sheet on the product information page. (See the QR code in the Troubleshooting section of the IOM). Acronyms: LWT: Leaving Water Temperature EXT: Extended Range application option EWT: Entering Water Temperature STD: Standard application option Table 1 CA Series Heat Pumps - 8733851021 (2025/04) US...
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Page 9: Standard Package
[1] CA Model Water-to-Air Heat Pump [2] Installation and Operation Manual 5 Initial Inspection Please inspect the product carefully for any defects or discrepancies. Should you identify any issue, contact the Bosch Wholesaler / Distributor you purchased the unit from. NOTICE NOTICE... -
Page 10: Installation
Never stretch or twist hoses and never use hoses that show screws in the unit sub base. external wear or damage or are suspected of having damage. Never exceed the manufacturer’s maximum working pressure recommendations. 10 | CA Series Heat Pumps - 8733851021 (2025/04) US... -
Page 11: Electrical
10.1.2 Units with Disconnect Switch Power Supply For models with disconnect switches, connect the field power to the marked terminals on the disconnect switch, and the ground to the ground lug. CA Series Heat Pumps -8733851021 (2025/04) US | 11... -
Page 12: Transformer Settings For 208/230-V Units
Thermostat terminal block Optional relays Figure 4 Low Voltage Electrical Box. Remote Mounted Controller (RMC) layout 12 | CA Series Heat Pumps - 8733851021 (2025/04) US... -
Page 13: Unit Mounted Controller (Umc)
When the UPM DIP switch position “2” is set to “ON” (R) refer to the UPM section for reset instructions. Y1 call relay Thermostat terminal block Optional relays Pressure relays Figure 6 Low Voltage Electrical Box. Unit Mounted Controller (UMC) Option layout CA Series Heat Pumps -8733851021 (2025/04) US | 13... -
Page 14: Safety Devices And The Upm Controller Overview
When a malfunction light is used for diagnostic purposes, the connection is made at [11] A2L Sensor (field supplied) the dry contact connection terminals of the UPM board. [12] 24VAC Power Common 14 | CA Series Heat Pumps - 8733851021 (2025/04) US... - Page 15 If temperature drops below or remains at the freeze limit trip for 120 seconds, the controller will shut down the compressor and enter into a soft-lockout condition. The default freeze limit trip is 25°F. CA Series Heat Pumps -8733851021 (2025/04) US | 15...
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Page 16: Upm Default Settings And Dip Switch Positions
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. 16 | CA Series Heat Pumps - 8733851021 (2025/04) US... - Page 17 If this alarm occurs two times (or four times if DIP switch position “1” is set to “ON”)(Refer to Figure 9)(See Table 3) within an hour, the controller will enter into a hard-lockout condition. CA Series Heat Pumps -8733851021 (2025/04) US | 17...
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Page 18: Upm Sequence Of Operation
Installation, Operation, and Maintenance Manual 11.3 UPM Sequence of Operation CLEAR FAULTS Figure 10 UPM Sequence of Operation Flowchart 18 | CA Series Heat Pumps - 8733851021 (2025/04) US... -
Page 19: Water-Quality Considerations
Maintaining proper water quality is important for insuring a long and trouble free service life for an CA series heat pump. (Refer to the Water Quality Table 6) For closed loop and boiler/tower systems water chemistry can be checked and easily maintained to ensure that corrosive elements, dissolved oxygen and pH levels are kept in check. -
Page 20: Water Quality Table
< 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 5 20 | CA Series Heat Pumps - 8733851021 (2025/04) US... -
Page 21: Post-Installation System Checkout
Record all system vitals using the “checkout sheet” and keep with equipment. Operate unit in the cooling cycle first, then the heating cycle for unit operating limits. Allow 15 minutes between cooling and heating tests for pressure to equalize. CA Series Heat Pumps -8733851021 (2025/04) US | 21... -
Page 22: Maintenance
• air temperature problems Use of the pressure and temperature charts for the unit may be required to properly determine the cause. 22 | CA Series Heat Pumps - 8733851021 (2025/04) US... -
Page 23: Checks To The Refrigerating Equipment
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 24: Removal And Evacuation
Ensure the system is leak-tested on completion of charging but prior to commissioning. A follow-up leak test must be carried out prior to leaving the site. 24 | CA Series Heat Pumps - 8733851021 (2025/04) US... -
Page 25: 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. CA Series Heat Pumps -8733851021 (2025/04) US | 25... -
Page 26: Troubleshooting
Inspect the air coil for dirt/debris. Is the Fault LED blinking two (2) times? Check duct work—Are dampers closed or blocked? Low pressure fault—Low Check refrigerant pressure with a gauge set. refrigerant 26 | CA Series Heat Pumps - 8733851021 (2025/04) US... - Page 27 Blocked return air times? on free return applications. Condensate fault— False Check that the condensate sensor is mounted on the drain pan, and the trigger terminal is not touching sheet metal. CA Series Heat Pumps -8733851021 (2025/04) US | 27...
- Page 28 If not check the resistance of the compressor windings using Burned out compressor the values shown in the compressor characteristics chart. Note that the compressor must be cool (70° F) when checking the windings. 28 | CA Series Heat Pumps - 8733851021 (2025/04) US...
- Page 29 For 75 and 100 VA transformers, check Faulty control that the transformer circuit breaker has not tripped. transformer Check low voltage circuit for overload conditions or short circuits before replacing the transformer. CA Series Heat Pumps -8733851021 (2025/04) US | 29...
- Page 30 High humidity Unit oversized Check unit performance against building load calculations. Short cycling Poor thermostat Make sure that the thermostat is not located near a supply air duct. location 30 | CA Series Heat Pumps - 8733851021 (2025/04) US...
- Page 31 Compressor noise Scaled or fouled water coil elevating heat pres- Clean/descale water coil. sure Check filter. Low air flow elevating head pressure Increase fan speed. Table 6 Unit Troubleshooting CA Series Heat Pumps -8733851021 (2025/04) US | 31...
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Page 32: Blower Performance Data
Installation, Operation, and Maintenance Manual 21 Blower Performance Data CFM @ 0.0 in.w.g Model Motor Speed Factory setting Cooling Heating High CA009 High CA012 High CA015 High CA018 Table 7 32 | CA Series Heat Pumps - 8733851021 (2025/04) US... -
Page 33: Waterside Pressure Drop
Water Side Pressure Drop Model Rate (psi) Coefficient (GPM) 1.32 1.30 CA009 1.28 1.26 0.98 0.94 CA012 0.91 0.89 0.94 0.91 CA015 0.88 0.87 0.89 0.86 CA018 0.85 0.83 Table 8 CA Series Heat Pumps -8733851021 (2025/04) US | 33... -
Page 34: Operating Data
16-20 173-183 376-396 28-32 141-157 339-363 15-18 16-20 174-184 377-397 17-18 28-32 325-349 7-10 196-206 404-424 10-11 141-157 16-20 32-36 141-157 351-375 15-18 16-20 141-157 335-359 7-10 16-20 Table 10 34 | CA Series Heat Pumps - 8733851021 (2025/04) US... - Page 35 365-448 8-10 43-50 2.25 114-142 326-402 14-20 21-25 152-184 364-450 16-19 43-51 114-141 318-388 7-10 21-25 173-207 390-477 9-11 47-55 2.25 116-145 368-451 14-19 20-24 117-144 362-439 7-10 20-24 Table 12 CA Series Heat Pumps -8733851021 (2025/04) US | 35...
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Page 36: Model 24 Thermistor (Freeze Sensor) Test Values
Table 13 Model 24 Thermistor (Freeze Sensor) Test Values 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 36 | CA Series Heat Pumps - 8733851021 (2025/04) US... -
Page 37: Wiring Diagrams
Installation, Operation, and Maintenance Manual 25 Wiring Diagrams Figure 11 FOR REFERENCE ONLY Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. CA Series Heat Pumps -8733851021 (2025/04) US | 37... - Page 38 Installation, Operation, and Maintenance Manual Figure 12 FOR REFERENCE ONLY Actual unit wiring may vary from this example. Always refer to the wiring diagram attached to the unit. 38 | CA Series Heat Pumps - 8733851021 (2025/04) US...
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Page 39: Schematic
Installation, Operation, and Maintenance Manual 26 Schematic Figure 13 CA Series Heat Pumps -8733851021 (2025/04) US | 39... -
Page 40: Dimensional Drawings
Notes: All dimensions in inches unless otherwise noted. All dimensions within +-0.125". Specifications subject to change without notice. Fresh Air Opening (In Sub-base Rear) : Caution! When installing unit in cold climates, an outside air damper must be provided to prevent possible condenser freeze-up. Table 14 40 | CA Series Heat Pumps - 8733851021 (2025/04) US... -
Page 41: Outside Cabinet Drawings
Installation, Operation, and Maintenance Manual 27.2 Outside Cabinet Drawings Figure 14 CA Series Heat Pumps -8733851021 (2025/04) US | 41... -
Page 42: Internal Connections Drawing
Installation, Operation, and Maintenance Manual 27.3 Internal Connections Drawing Figure 15 42 | CA Series Heat Pumps - 8733851021 (2025/04) US... -
Page 43: 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. CA Series Heat Pumps -8733851021 (2025/04) US | 43... -
Page 44: Check-Out Sheet
Discharge Pressure (psig)*: ____________________________________________________________________ ____________________________________________________________________ Suction Temperature*: ____________________________________________________________________ ____________________________________________________________________ Discharge Temperature*: ____________________________________________________________________ ____________________________________________________________________ Suction Superheat*: ____________________________________________________________________ ____________________________________________________________________ Entering TXV/Cap Tube Temperature*: ____________________________________________________________________ ____________________________________________________________________ Liquid Subcooling*: ____________________________________________________________________ ____________________________________________________________________ * Required for Troubleshooting ONLY 44 | CA Series Heat Pumps - 8733851021 (2025/04) US... - Page 45 Installation, Operation, and Maintenance Manual CA Series Heat Pumps -8733851021 (2025/04) US | 45...
- Page 46 Installation, Operation, and Maintenance Manual 46 | CA Series Heat Pumps - 8733851021 (2025/04) US...
- Page 47 Installation, Operation, and Maintenance Manual CA Series Heat Pumps -8733851021 (2025/04) US | 47...
- Page 48 8733851021/ (2025/04) 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.
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