A water source heat pump capacitor must match the failed component’s capacitance, voltage rating, and function; the product name alone cannot confirm compatibility. My strongest all-around candidate in this lineup is the Packard TRCFD455 for systems calling for a 45/5 µF dual run capacitor, while the TEMCo CD60 serves a different need as a motor start capacitor. For a single-value run application, the Genteq 30 µF is a focused replacement option. The main tradeoffs are matching the exact electrical specification, choosing the right round or oval form, and distinguishing start capacitors from run capacitors. Read on for the full comparison and a guide to checking fit before ordering.
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Key Takeaways
These capacitors serve different jobs: TEMCo CD60 is listed as a motor start capacitor, while the other picks are run or dual run types; they are not interchangeable by appearance.
Dual run models combine two capacitance values: the 40/5 µF and 45/5 µF options suit equipment specified for those exact compressor and fan values.
Voltage ratings vary: several options list 370/440V or 370/450V, but the replacement must meet the equipment’s required voltage rating.
Shape affects installation: round and oval bodies can require different mounting space and terminal clearance, even when electrical values match.
Exact model and label matching matter more than broad category claims: the lineup spans 7.5 µF single-value units through 50 µF models, so no one pick fits every water source heat pump.
| TEMCo CD60 Round Motor Start Capacitor, 105-126 uF, 220-250V AC, 50/60 Hz |  | Best for Compatible Motor Starts | Capacitance: 105–126 uF | Voltage: 220–250 VAC | Frequency: 50/60 Hz | VIEW ON AMAZON | See Our Full Breakdown |
| 30 uF MFD 440 VAC Genteq Replacement Run Capacitor Round (C430R / 97F9635) |  | Best for a Specific 30 uF Replacement | Capacitance: 30 uF/MFD | Voltage: 440 VAC | Shape: Round | VIEW ON AMAZON | See Our Full Breakdown |
| 40/5 MFD Dual Run Round AC Capacitor, 440 VAC |  | Best Dual-Run Match for Heat Pumps | Capacitance: 40/5 MFD | Voltage: 440 VAC | Shape: Round | VIEW ON AMAZON | See Our Full Breakdown |
| BOJACK 7.5 µF Oval Run Capacitor, 370/440V |  | Best Compact Oval Run Replacement | Model: CBB65 | Capacitance: 7.5 µF | Capacitance tolerance: ±6% | VIEW ON AMAZON | See Our Full Breakdown |
| HUAREW 45/5 µF Dual Run Round AC Capacitor, 370/440 VAC |  | Best for Labeled Dual-Run Connections | Model: CBB65B | Capacitance: 45/5 µF | Capacitance tolerance: ±6% | VIEW ON AMAZON | See Our Full Breakdown |
| Packard TRCFD455 45+5 MFD 440/370V Round Run Capacitor, Replaces PRCFD455 |  | Best for Long Service Life | Model: TRCFD455 | Capacitance: 45+5 MFD | Voltage: 440/370V | VIEW ON AMAZON | See Our Full Breakdown |
| FOCSPROD 40+5 uF 40/5 MFD ±6% 370V/440V CBB65 Dual Run Round AC Capacitor |  | Best for Certified Replacement Options | Capacitance: 40+5 uF (40/5 MFD), ±6% | Voltage and frequency: 370/440 VAC, 50/60 Hz | Type: CBB65 dual run round capacitor | VIEW ON AMAZON | See Our Full Breakdown |
| BOJACK 50 µF ±5% 370/450V CBB65 Round Run Start Capacitor for AC Motors, Fans, and Heat Pump Air Conditioners |  | Best for Single-Value 50 µF Replacements | Capacitance: 50 µF (50 MFD) | Tolerance: ±5% | Voltage: 370/450 VAC | VIEW ON AMAZON | See Our Full Breakdown |
| HUAREW 7.5 µF ±6% 370/440 VAC CBB65 Oval Run Start Capacitor for HVAC Motors |  | Best for Compact Fan Motor Circuits | Capacitance: 7.5 µF | Capacitance tolerance: ±6% | Voltage: 370/440 VAC operation; 450 V maximum listed | VIEW ON AMAZON | See Our Full Breakdown |
| water source heat pump capacitor | Capacitance | Voltage | Operating temperature |
|---|---|---|---|
| TEMCo CD60 Round Motor Start C | 105–126 uF | 220–250 VAC | −40°C to +65°C |
| 30 uF MFD 440 VAC Genteq Repla | 30 uF/MFD | 440 VAC | — |
| 40/5 MFD Dual Run Round AC Cap | 40/5 MFD | 440 VAC | −40°F to 158°F |
| BOJACK 7.5 µF Oval Run Capacit | 7.5 µF | 370/440V | −40°C to 70°C |
| HUAREW 45/5 µF Dual Run Round | 45/5 µF | 370/440 VAC | — |
| Packard TRCFD455 45+5 MFD 440/ | 45+5 MFD | 440/370V | — |
| FOCSPROD 40+5 uF 40/5 MFD ±6% | 40+5 uF (40/5 MFD), ±6% | — | -40°C to +70°C |
| BOJACK 50 µF ±5% 370/450V CBB6 | 50 µF (50 MFD) | 370/450 VAC | -40°C to +70°C |
| HUAREW 7.5 µF ±6% 370/440 VAC | 7.5 µF | 370/440 VAC operation; 450 V maximum listed | -40°C to 70°C |
More Details on Our Top Picks
TEMCo CD60 Round Motor Start Capacitor, 105-126 uF, 220-250V AC, 50/60 Hz
The TEMCo CD60 is the lineup’s dedicated motor start capacitor, with a 105–126 uF range for compatible single-phase motors and pumps. Its 220–250 VAC rating and quick-disconnect terminals may suit a water source heat pump repair when they match the original part and equipment specifications. Compared with the ClimaTek 30 uF Genteq replacement, this has much higher capacitance and is intended for starting rather than continuous run duty, so the two are not interchangeable. The phenolic resin case, oil-filled construction, UL rating, and five-year warranty are useful build and documentation details. The tradeoff is its limited voltage rating and variable capacitance range: I would use it only when the equipment calls for a start capacitor in this range, not as a general heat pump capacitor replacement.
Pros:- 105–126 uF range covers compatible motor start applications
- Oil-filled construction and phenolic resin case
- UL rated and PCB-free
- 1/4-inch quick-disconnect terminals and five-year warranty
Cons:- 220–250 VAC rating excludes equipment requiring a higher-rated capacitor
- Start-only design is unsuitable for continuous run duty
- Capacitance range is less precise than a fixed-value replacement
Best for: Repairers replacing a compatible 105–126 uF, 220–250 VAC single-phase motor start capacitor in a heat pump or pump.
Not ideal for: Owners whose equipment specifies a run or dual-run capacitor, a different voltage, or a fixed capacitance outside this range.
- Capacitance:105–126 uF
- Voltage:220–250 VAC
- Frequency:50/60 Hz
- Operating temperature:−40°C to +65°C
- Shape and dimensions:Round; 1.43 in diameter × 3.45 in high
- Case and fill:Phenolic resin; electrolytic oil-filled
- Terminals:1/4-inch quick disconnect
- Certification and warranty:UL rated E492933; five years
Our verdict“Choose the TEMCo when the original part calls for a 105–126 uF start capacitor at 220–250 VAC; skip it for run-capacitor replacements.”
30 uF MFD 440 VAC Genteq Replacement Run Capacitor Round (C430R / 97F9635)
The ClimaTek 30 uF run capacitor earns a place for buyers matching a known GE/Genteq C430R or 97F9635 part number. Its 440 VAC rating and stated drop-in fit can simplify a compatible replacement by avoiding wiring changes or adapters. That makes it a narrower choice than the 40/5 MFD dual run capacitor, which serves separate compressor and fan circuits, while the ClimaTek provides one 30 uF run value. For a water source heat pump, the listed HVAC fit alone does not establish compatibility; the existing capacitor’s value, voltage, and terminal arrangement still need to match. The product data provides little detail on dimensions, tolerance, temperature range, or warranty, so buyers who need those confirmed may prefer a better-documented option. I would select it for part-number matching, not as a universal substitute.
Pros:- Stated direct replacement for GE/Genteq C430R and 97F9635
- Drop-in installation is specified without wiring changes or adapters
- 440 VAC rating
- Made in North America
Cons:- Single 30 uF value limits use to matching equipment
- Product data does not list dimensions or operating temperature range
- Listed HVAC replacement fit does not confirm compatibility with every water source heat pump
Best for: HVAC repairers replacing a confirmed GE/Genteq C430R or 97F9635 30 uF run capacitor.
Not ideal for: Buyers without a confirmed 30 uF specification or those needing a dual-run capacitor, detailed dimensions, or published temperature limits.
- Capacitance:30 uF/MFD
- Voltage:440 VAC
- Shape:Round
- Replacement part numbers:GE/Genteq C430R / 97F9635
- Brand:ClimaTek
- Country of origin:North America
- Application:HVAC run capacitor replacement
- Installation:Stated drop-in replacement with no wiring changes or adapters
Our verdict“Pick the ClimaTek when its 30 uF value and replacement part number match the existing run capacitor.”
40/5 MFD Dual Run Round AC Capacitor, 440 VAC
Among these five options, the 40/5 MFD dual-run capacitor is the clearest match for equipment that uses one capacitor for both compressor and fan circuits. Its 440 VAC rating can replace specified 370 VAC capacitors as well as 440 VAC units, provided the capacitance and equipment requirements match. That gives it broader voltage flexibility than the HUAREW 45/5 µF dual-run capacitor, but their 40/5 and 45/5 values differ, so they are not substitutes for one another. The stated dimensions, temperature range, and EIA and IEC standards give buyers more installation and specification detail than the ClimaTek 30 uF listing. The main tradeoff is that compatibility depends on matching both capacitance values and the physical fit. I would shortlist it for a water source heat pump only after checking its nameplate requirements.
Pros:- Dual-run format serves compatible compressor and fan circuits
- 440 VAC model is stated to replace 370 VAC and 440 VAC capacitors
- Wide operating range from −40°F to 158°F
- Lists EIA-456-A and IEC 60252-1:2001 standards
Cons:- Both capacitance values must match the equipment specification
- 2-inch by 5.25-inch case may not fit every compartment
- Product description does not identify a specific replacement part number
Best for: Heat pump owners replacing a round dual-run capacitor specified at 40/5 MFD and compatible with its dimensions.
Not ideal for: Buyers whose equipment calls for another dual-run value, a single run capacitor, or a different case size.
- Capacitance:40/5 MFD
- Voltage:440 VAC
- Shape:Round
- Dimensions:2 in diameter × 5.25 in tall
- Operating temperature:−40°F to 158°F
- Standards:EIA-456-A and IEC 60252-1:2001
- Compatible systems:Condenser air conditioners and heat pumps
- Replacement voltage range:Stated to replace 370 VAC and 440 VAC capacitors
Our verdict“Choose this dual-run model when the equipment specifies 40/5 MFD and the round case fits.”
BOJACK 7.5 µF Oval Run Capacitor, 370/440V
The BOJACK 7.5 µF oval capacitor is the lineup’s compact single-value run option, aimed at compressor or fan motor circuits that specify exactly 7.5 µF. Its oval CBB65 case measures 2.03 × 1.22 × 3.55 inches, a shape that may suit a tight mounting space where a round capacitor such as the 40/5 MFD dual-run model would be a poor physical fit. The broad −40°C to 70°C operating range and 50/60 Hz rating cover the listed HVAC applications, but neither makes it a fit for every water source heat pump. Unlike that dual-run alternative, this BOJACK provides only one capacitance value, so it cannot serve both compressor and fan circuits through separate ratings. The ±6% tolerance and voltage-match requirement make checking the original part especially important.
Pros:- Compact oval case with listed dimensions
- Supports compatible compressor and fan motor applications
- Rated for 50/60 Hz systems
- 440V model can replace a 370V capacitor when capacitance matches
Cons:- Single 7.5 µF value cannot replace a dual-run capacitor
- A 370V capacitor cannot replace a 440V unit
- ±6% tolerance requires matching the equipment’s stated specification
Best for: Technicians replacing a 7.5 µF oval run capacitor where the original case shape and dimensions are needed.
Not ideal for: Owners needing a dual-run capacitor or whose equipment specifies a different capacitance or voltage.
- Model:CBB65
- Capacitance:7.5 µF
- Capacitance tolerance:±6%
- Voltage:370/440V
- Frequency:50/60 Hz
- Shape and dimensions:Oval; 2.03 × 1.22 × 3.55 in
- Materials:Aluminum case, steel cover, metallized polypropylene film
- Operating temperature:−40°C to 70°C
Our verdict“Choose this BOJACK for a space-constrained installation that calls for a 7.5 µF oval run capacitor.”
HUAREW 45/5 µF Dual Run Round AC Capacitor, 370/440 VAC
The HUAREW 45/5 µF dual-run capacitor is aimed at a specific repair: a compatible system using separate compressor and fan terminals marked Herm/H, Fan/F, and C. Those labels can help a buyer map the connections when replacing a matching part, while the −40°C to 70°C range covers a broad stated working span. Its 45/5 value sets it apart from the 40/5 MFD dual-run model; even though their formats are similar, the compressor-side capacitance differs, so one should not be substituted for the other without equipment specifications supporting that choice. The HUAREW listing also states ±6% tolerance and S1 protection, but omits dimensions. That leaves physical fit less certain than with the measured BOJACK oval model or the 40/5 round capacitor. I would favor it when the electrical match is clear and case dimensions can be verified.
Pros:- Dual-run design for compatible compressor and fan circuits
- Terminals labeled Herm/H, Fan/F, and C
- Stated ±6% capacitance tolerance
- Working temperature range from −40°C to 70°C
Cons:- No dimensions are provided, making case fit harder to confirm
- 45/5 µF value is not interchangeable with the lineup’s 40/5 µF model
- Compatibility still depends on the original capacitor and equipment specification
Best for: Repairers replacing a confirmed 45/5 µF dual-run capacitor who need labeled compressor, fan, and common terminals.
Not ideal for: Buyers who cannot verify case dimensions or whose heat pump specifies 40/5 µF or another capacitance.
- Model:CBB65B
- Capacitance:45/5 µF
- Capacitance tolerance:±6%
- Voltage:370/440 VAC
- Working temperature:−40°C to 70°C
- Terminals:Herm/H (compressor), Fan/F, C (common)
- Safety protection level:S1
- Application:AC units, heat pumps, and condensers
Our verdict“Choose the HUAREW when the system specifies 45/5 µF and the case dimensions can be confirmed before installation.”
Packard TRCFD455 45+5 MFD 440/370V Round Run Capacitor, Replaces PRCFD455
The Packard TRCFD455 stands out for its stated 60,000-hour operational life and dual 45+5 MFD rating, making it a candidate when a water source heat pump calls for those exact values. Its 440/370V rating and replacement reference to PRCFD455 give buyers concrete details to compare against the existing part. The heavy-edged polypropylene film dielectric and anti-explosion safety switch add construction and protection features. Compared with the FOCSPROD 40+5 uF, Packard has a higher main capacitance and a stated service-life figure; that difference only helps when it matches the equipment label. The round body measures 2.50 inches across and 3.74 inches high, so space and mounting fit need checking. It is a poor choice when the original capacitor’s values differ, and the listing does not include mounting hardware.
Pros:- Specified 60,000-hour operational life
- Dual 45+5 MFD rating with 440/370V designation
- Heavy-edged metalized polypropylene film dielectric
- Anti-explosion safety switch and stated EIA-456-A and IEC 60252-1:2001 compliance
Cons:- Must match the equipment’s capacitance, voltage, and physical clearances
- Installation may require HVAC or electrical knowledge
- No mounting hardware or installation accessories are listed
Best for: Heat pump owners or HVAC technicians replacing a PRCFD455 or matching 45+5 MFD dual run capacitor who want a stated long operational life.
Not ideal for: Buyers whose equipment specifies another capacitance, voltage, or body size, or who need mounting hardware included.
- Model:TRCFD455
- Capacitance:45+5 MFD
- Voltage:440/370V
- Shape:Round
- Dimensions:2.50 in diameter × 3.74 in height
- Operational life:60,000 hours
- Dielectric material:Heavy-edged metalized polypropylene film
- Mounting type:Through-hole mount
Our verdict“Choose the Packard when your heat pump calls for 45+5 MFD and its stated long service life is a priority.”
FOCSPROD 40+5 uF 40/5 MFD ±6% 370V/440V CBB65 Dual Run Round AC Capacitor
The FOCSPROD 40+5 uF is a dual run option for equipment that specifies a 40/5 MFD capacitor, with 370/440 VAC operation and a ±6% tolerance. Its UL Recognized and TÜV Rheinland certifications give buyers specific safety credentials to check against their replacement needs. The listed compatibility with several OEM numbers can help identify a match, though the equipment’s own rating remains the deciding reference. Compared with the Packard TRCFD455, this model has a lower main capacitance and a stated lifetime warranty, while Packard lists a 60,000-hour operational life. FOCSPROD also specifies operation from -40°C to +70°C and a 50 mm by 125 mm round body. That taller profile may limit fit, and the broad replacement list does not remove the need to verify capacitance and voltage.
Pros:- UL Recognized and TÜV Rheinland certified
- 40+5 uF rating with ±6% tolerance
- Listed compatibility with multiple OEM replacement numbers
- Specified operating range from -40°C to +70°C and lifetime warranty
Cons:- Exact capacitance and voltage must match the equipment requirements
- At 125 mm tall, it may not fit every capacitor compartment
- Lifetime warranty terms are not detailed in the provided product data
Best for: Heat pump owners and service technicians whose unit specifies a 40/5 MFD dual run capacitor and who want listed certifications and OEM cross-references.
Not ideal for: Buyers whose equipment calls for a different rating or whose capacitor compartment cannot accommodate a 125 mm-tall body.
- Capacitance:40+5 uF (40/5 MFD), ±6%
- Voltage and frequency:370/440 VAC, 50/60 Hz
- Type:CBB65 dual run round capacitor
- Dimensions:50 mm (1.97 in) diameter × 125 mm (4.92 in) height
- Operating temperature:-40°C to +70°C
- Certifications:UL Recognized, TÜV Rheinland Certified
- Material:Aluminum, polypropylene
- Mounting type:Through-hole mount
Our verdict“Pick this FOCSPROD model when your unit specifies 40/5 MFD and its certifications and replacement references fit your needs.”
BOJACK 50 µF ±5% 370/450V CBB65 Round Run Start Capacitor for AC Motors, Fans, and Heat Pump Air Conditioners
This BOJACK capacitor is the single-value pick in a lineup that otherwise includes dual ratings such as the Packard TRCFD455’s 45+5 MFD. Its 50 µF rating and ±5% tolerance suit a heat pump or motor only when that is the specified replacement value; it cannot substitute for a dual run capacitor with separate compressor and fan ratings. The 370/450 VAC designation and operating range of -40°C to +70°C provide useful selection details for HVAC applications. A built-in 10,000 AFC anti-explosion pressure switch is another stated safety feature. Compared with the FOCSPROD 40+5 uF, BOJACK offers one 50 µF value rather than a dual rating, so it fits a narrower set of replacement requirements. Physical dimensions are not provided here, making compartment fit harder to assess before purchase.
Pros:- 50 µF single-value rating with ±5% tolerance
- 370/450 VAC designation
- Specified operating range from -40°C to +70°C
- Built-in 10,000 AFC anti-explosion pressure switch
Cons:- Cannot replace dual run models when separate fan and compressor ratings are required
- Physical dimensions are not included in the provided product data
- Matching the existing capacitance and voltage is necessary
Best for: Heat pump owners or technicians replacing a capacitor specifically rated at 50 µF who need a single-value round run capacitor.
Not ideal for: Buyers whose unit requires a dual run capacitor, a different capacitance, or confirmed dimensions before ordering.
- Capacitance:50 µF (50 MFD)
- Tolerance:±5%
- Voltage:370/450 VAC
- Type:CBB65 round run/start capacitor
- Operating temperature:-40°C to +70°C
- Safety feature:10,000 AFC anti-explosion pressure switch
- Applications:Central air conditioners, heat pumps, condenser fan motors, compressors
Our verdict“Choose the BOJACK only when your heat pump specifies a single-value 50 µF capacitor and the available fit details are sufficient.”
HUAREW 7.5 µF ±6% 370/440 VAC CBB65 Oval Run Start Capacitor for HVAC Motors
The HUAREW is the low-capacitance, oval-shaped choice here, intended for a heat pump or HVAC motor circuit that calls for 7.5 µF. Its ±6% tolerance and listed replacement part numbers give buyers ways to check a match, while the oval body and rack mount distinguish it from the round dual run capacitors such as the FOCSPROD 40+5 uF. That distinction matters: this is not a substitute for a larger dual run capacitor when the equipment requires separate fan and compressor values. The listed temperature range of -40°C to 70°C suits a broad range of operating conditions, and the S1 protection level is specified. Its 7.5 µF rating limits it to matching circuits; the product data also gives a 450 V maximum rather than a full dimensional profile, so fit details may need checking.
Pros:- 7.5 µF rating with clearly stated ±6% tolerance
- Oval shape and rack-mount design
- Listed compatibility with multiple HVAC replacement part numbers
- Specified operating range from -40°C to 70°C
Cons:- Limited to circuits that specify 7.5 µF
- Not a replacement for a dual run capacitor such as the FOCSPROD 40+5 uF
- No mounting hardware or installation instructions are listed
Best for: HVAC technicians or heat pump owners replacing an oval, rack-mounted 7.5 µF capacitor in a fan or motor circuit.
Not ideal for: Buyers who need a dual run capacitor, a capacitance above 7.5 µF, or confirmed physical dimensions before selecting a replacement.
- Capacitance:7.5 µF
- Capacitance tolerance:±6%
- Voltage:370/440 VAC operation; 450 V maximum listed
- Shape:Oval
- Mounting type:Rack mount
- Operating temperature:-40°C to 70°C
- Material:Copper
- Safety protection level:S1
- Replacement for:1499-5461, 27L566BZ3, 27L566, 27L566S, 97F9001, 97F9001BX, Z97F9001, TOCF7.5, CPT-00120, TP-CAP-7.5/440
Our verdict“Select the HUAREW for a matching 7.5 µF oval fan or motor circuit, not as a general heat pump capacitor replacement.”
How We Picked
I compared the nine products by their stated capacitance, voltage, capacitor type, and physical shape, since those determine whether a candidate may match a specific heat pump application. I also considered how clearly each product is identified for a distinct use, such as a single-value run capacitor, dual run capacitor, or motor start capacitor. The ranking gives priority to clearly specified options with a defined role and useful replacement information, rather than treating higher capacitance or broader claims as automatic advantages.
The order is a guide to comparing the listed options, not a universal compatibility ranking: the correct replacement depends on the equipment label and original capacitor. A 45/5 µF dual run model ranks well for buyers whose system specifies that value, but it is a poor choice for a system calling for 40/5 µF or a single-value capacitor. I placed specialized options lower when their stated role or fit is narrower, and I flag that product details alone do not establish approval for a particular heat pump.
| water source heat pump capacitor | Operating temperature |
|---|---|
| TEMCo CD60 Round Motor Start C | −40°C to +65°C |
| 30 uF MFD 440 VAC Genteq Repla | — |
| 40/5 MFD Dual Run Round AC Cap | −40°F to 158°F |
| BOJACK 7.5 µF Oval Run Capacit | −40°C to 70°C |
| HUAREW 45/5 µF Dual Run Round | — |
| Packard TRCFD455 45+5 MFD 440/ | — |
| FOCSPROD 40+5 uF 40/5 MFD ±6% | -40°C to +70°C |
| BOJACK 50 µF ±5% 370/450V CBB6 | -40°C to +70°C |
| HUAREW 7.5 µF ±6% 370/440 VAC | -40°C to 70°C |
Factors to Consider When Choosing Water Source Heat Pump Capacitor
Before choosing a replacement, use the old capacitor label and the heat pump’s service information to establish the required values and type. These checks help prevent a common mistake: buying a capacitor that looks similar but serves a different motor function.
Match Capacitance Values Exactly
Read the microfarad (µF or MFD) rating on the existing part and compare it with the equipment documentation. A dual run capacitor lists two values, commonly written as 40/5 or 45/5, for separate motor circuits. Those numbers are not a range or interchangeable alternatives. A single-value 30 µF part cannot replace a dual 40/5 µF unit just because both are run capacitors. Small allowed tolerances are usually printed on the capacitor, but they do not permit changing to a different nominal value. If the label is unreadable, identify the exact heat pump model and consult its service data before ordering.
Choose the Correct Capacitor Function
Start and run capacitors have different roles and electrical characteristics, even when their housings appear alike. A start capacitor provides a brief boost during startup, while a run capacitor remains in the circuit during operation; dual run designs serve two circuits. Replacing one type with another can cause poor operation or damage. Product descriptions that mention several applications do not establish that a part is suitable for every heat pump motor. Use the schematic or original part number to identify the function. If the system uses a start capacitor and a separate run capacitor, verify both parts individually.
Check Voltage Rating and System Requirements
The replacement voltage rating must meet or exceed the requirement specified by the equipment maker, and the capacitance still must match. Listings such as 370/440V describe voltage options or ratings, but the exact meaning and configuration should be confirmed in the product documentation. Do not select a part based only on the larger voltage figure. Check whether the original is rated for the system’s operating conditions and whether the replacement is intended for continuous run service or brief start duty. A higher voltage rating does not compensate for the wrong capacitance or capacitor type. When service documentation names a part number, use it as a cross-check.
Measure Space, Shape, and Terminal Clearance
Round and oval capacitors may differ in mounting footprint, height, and terminal layout. Measure the existing body and available bracket space before selecting a replacement, especially in a compact heat pump cabinet. Confirm that wires can reach the terminals without tension and that the cover can close without pressing on the part. A matching electrical rating is not enough if the replacement cannot be secured safely. Check terminal markings and orientation before moving any wiring. If the candidate’s dimensions are absent from its listing, seek them from the manufacturer or seller before purchase.
Use the Equipment Label to Resolve Uncertainty
Heat pumps can use different capacitor arrangements across models and revisions, so a broad category label cannot identify the correct part. Record the unit model and serial number, then compare the parts diagram or service documentation with the old capacitor’s markings. A cross-reference number can help, but confirm that it corresponds to the required capacitance and duty. Avoid inferring compatibility from a product title that mentions air conditioners or heat pumps generally. If the original has failed or is missing, a qualified HVAC technician can identify the specification from the wiring diagram. This step is especially useful when deciding among the lineup’s similar-looking dual run models.
Know When Professional Service Makes Sense
Capacitors can retain a dangerous electrical charge after power is disconnected, and heat pump cabinets contain other electrical hazards. If you are not trained to verify isolation and discharge components safely, have a qualified technician handle diagnosis and replacement. Paying for a correct diagnosis can prevent repeated part swaps when the underlying problem is a motor, wiring fault, or control issue. A new capacitor that fails quickly may indicate a wider fault rather than a defective replacement. Keep the removed part’s label or a clear photo for comparison. Follow the equipment maker’s service instructions for any repair.
Frequently Asked Questions
Can I use any capacitor labeled for an air conditioner in my water source heat pump?
No. The application wording does not prove that the capacitance, voltage rating, duty, and terminals match your heat pump. Compare the candidate with the original part label and the unit’s service documentation. A product listed for heat pumps may still have the wrong µF value or capacitor function for your model. Treat compatibility as specific to the equipment, not the broad HVAC category.
How do I choose between the 40/5 µF and 45/5 µF dual run options?
Use the value specified on your existing capacitor or in the heat pump’s service data. The first number and second number correspond to different motor circuits, so the two products are not substitutes for each other. Check the voltage rating, shape, terminal layout, and part cross-reference after confirming the capacitance. If the old label is damaged, identify the unit model and consult its documentation or a technician rather than guessing from symptoms.
Is a 440V capacitor automatically a better replacement than a 370V one?
A higher voltage rating may be suitable when the capacitance and capacitor type match, but it does not make an otherwise incorrect part compatible. Follow the heat pump manufacturer’s stated requirement and confirm the replacement’s intended service. Listings may combine voltage figures in ways that need clarification from the product documentation. Do not use voltage as a reason to overlook the µF rating, shape, or terminal arrangement.
Can the TEMCo CD60 start capacitor replace a run capacitor?
Do not use it as a run capacitor unless the equipment documentation explicitly specifies that exact component. The CD60 is identified as a motor start capacitor, while run capacitors are designed for a different role in the motor circuit. Similar-looking housings do not mean similar electrical behavior. Check whether your system uses a separate start capacitor, and match its listed capacitance and voltage requirements before selecting a replacement.
What should I do if I cannot read the old capacitor’s label?
Look up the heat pump’s model number in its service manual, wiring diagram, or parts list to find the required capacitor specification. If the old component is missing, do not estimate its value from the unit size or from another machine. A technician can trace the circuit and identify the correct part safely. Save photos of the unit data plate and wiring diagram, since those details can help confirm a replacement before you order it.
Conclusion
For a system specified for 45/5 µF dual run service, the Packard TRCFD455 is my best overall pick in this lineup because its stated role and replacement reference are clear. The FOCSPROD 40/5 µF is the value-oriented choice when that exact rating fits, while the Genteq 30 µF suits buyers whose equipment calls for a single-value run capacitor. Beginners should start with the original label and unit documentation, then ask a technician to confirm fit if any detail is uncertain. For a separate motor start application, consider the TEMCo CD60 only when its specifications match the original. The best choice is the one that matches your heat pump’s required values, function, voltage, and physical fit.
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