SENVILLE R454B Central Heat Pump | 4 Tons - 48000 BTU

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• Federal Rebate:
• Provincial Rebate: 4740$
• Energy Star®: Non
• WiFi: En Option
• AHRI: 215735329
• Efficiency: 16.5 SEER
• Warranty (Compressor - Parts - Labor): 10-10-0
• Additional Warranty (10-10-10): Possible
• Voltage: 220V
• Sound Pressure Level (Outdoor): 65.0 dB(A)
• Gas (Freon): R-454B

A 4-ton inverter central heat pump designed to replace a traditional system without sacrificing winter heating

The 4-ton SENVILLE SENDC-48HF central heat pump, with a nominal cooling capacity of 48,000 BTU, is intended for homeowners who want to preserve the even comfort of a ducted system while switching to inverter technology capable of modulating its output according to the building's actual demand.

For us at AirGreen, this is precisely where this type of system becomes interesting. In many homes in Montreal, Laval, Longueuil, the North Shore, and the South Shore, the owner already has functional ductwork, but the old central air conditioner or fixed-speed heat pump is nearing the end of its service life. In this context, replacing the entire air distribution system would make no sense. The priority is instead to integrate new equipment capable of using the existing network efficiently.

The combination presented includes:

• the SENDC-48HF-OG outdoor unit;
• the SENDC-48HF-IG indoor unit;
• a nominal cooling capacity of 48,000 BTU;
• a 208/230 V single-phase system;
• an inverter-technology compressor;
• the R-454B refrigerant;
• a heating capacity rated down to -30 °C;
• a maximum indoor airflow of approximately 1,601 CFM;
• an AHRI 215735329 number.

In its documentation, Senville presents the SENDC-48HF as a 48,000 BTU central heat pump system designed to cool large spaces and maintain heating down to -30 °C. The manufacturer refers to an application covering approximately 1,800 sq. ft., while requiring professional installation.

This area remains a general guideline. At AirGreen, we never size a 4-ton central heat pump based solely on square footage. A recently built 1,800-square-foot home does not have the same heat loss as a building of the same size that is several decades old.

4 tons: what this capacity really means

One ton of air conditioning corresponds to approximately 12,000 BTU/h. A four-ton heat pump therefore has a cooling capacity of around 48,000 BTU/h.

However, the technical documentation for the SENDC-48HF goes well beyond this nominal figure. It indicates a cooling modulation range of approximately 15,600 to 51,000 BTU/h. In heating mode, the manufacturer lists a nominal capacity of 50,000 BTU/h, with a modulation range of approximately 15,500 to 57,300 BTU/h.

This is a fundamental difference from an older central system operating essentially in on/off mode.

When the building needs only part of the available capacity, the inverter compressor can reduce its output. When the outdoor temperature rises sharply in summer or falls in winter, the system can increase its output.

This modulation notably makes it possible to pursue:

• more stable indoor temperatures;
• longer, more regular operating cycles;
• better adaptation to the actual load;
• fewer full compressor starts;
• more consistent air distribution through the ductwork.

Sizing nevertheless remains essential. An inverter system does not eliminate the consequences of a significantly oversized unit.

1,601 CFM: an airflow consistent with a four-ton heat pump

Airflow is one of the most interesting specifications of this model.

Senville indicates four indoor levels capable of reaching:

• 1,601 CFM;
• 1,471.5 CFM;
• 1,283.1 CFM;
• 1,094.8 CFM.

To put this value into context, central systems are often designed around a figure close to 400 CFM per ton, although the final airflow depends on the system design, humidity, load, and manufacturer settings.

Four tons multiplied by approximately 400 CFM gives around 1,600 CFM.

This means that the existing ductwork must be capable of carrying that airflow.

This is something we systematically check at AirGreen. Installing an excellent 48,000 BTU heat pump on ductwork that is too restrictive can cause excessive static pressure, increased noise, poor distribution, and performance below expectations.

The classic trap: automatically replacing an old 4-ton unit with a new 4-ton unit

In the field of residential HVAC in Montreal, we regularly encounter systems installed 15, 20, or 25 years ago.

When an old unit is rated at four tons, it is tempting to order exactly the same capacity.

It is not always the right decision.

Since the old system was installed, the property may have received:

• new windows;
• more insulation;
• air-sealing improvements;
• a new roof;
• a finished basement;
• modifications to the ductwork.

The current heating load may therefore be different.

Conversely, an addition, a sunroom converted into a habitable room, or a poorly insulated floor can increase demand.

At AirGreen, we prefer to verify the actual configuration before confirming that 48,000 BTU remains the appropriate capacity.

SEER2 of 16.5 and EER2 of 10.5

The official documentation states:

These data come from the manufacturer’s technical table.

A SEER2 of 16.5 should not be compared directly with that of a small, high-end wall-mounted heat pump, which may sometimes display ratings above 25 or 30.

We are referring here to a four-ton central system that must supply a duct network, move up to approximately 1,600 CFM, and heat an entire home or a large area.

The central system offers another major advantage: the temperature is distributed across multiple rooms through the existing ducts, rather than from a single wall-mounted head.

Heating at -8 °C, -15 °C, and -30 °C: the figures that really matter

The statement “heating down to -30 °C” is useful, but it is not enough to evaluate a heat pump intended for Quebec.

The data provided with this combination indicate approximately:

• 39,500 BTU/h at -8 °C;
• 46,000 BTU/h at -15 °C;
• up to 25,900 BTU/h at -30 °C.

The stated COP is approximately:

• 2.6 at -8 °C;
• 1.9 at -15 °C;
• 1.33 at -30 °C.

These values clearly show why we never look only at the minimum temperature.

At -30 °C, the heat pump continues to produce heat, but its available capacity is significantly lower than its nominal capacity of 48,000 BTU.

Meanwhile, the building requires more heating.

The question therefore becomes: what is the home’s heat loss at that temperature?

It is what determines whether an auxiliary heat source will be necessary.

Auxiliary heating: 10 kW, 15 kW, or 20 kW depending on the project

The Senville product page shown in the brochure features auxiliary heating options of 10 kW, 15 kW, or 20 kW.

This possibility is particularly relevant in our climate.

A central heat pump does not necessarily have to cover 100% of the home’s heating load during the coldest few hours of the year. A properly sized auxiliary electric element can take over or supplement the heat pump when necessary.

However, the choice between 10, 15, and 20 kW should not be arbitrary.

It affects:

• backup heating capacity;
• the building’s electrical load;
• required circuit size;
• electrical panel capacity;
• the system control strategy.

In certain Montreal properties equipped with a limited-capacity electrical service, this check becomes decisive even before the equipment is ordered.

AirGreen installation: what really makes the difference with a 48,000 BTU central heat pump

A central unit cannot compensate for inadequate ductwork

One of the advantages of a central heat pump is also one of its main constraints: it depends entirely on the ductwork.

For a replacement project, we check in particular:

• the size of the return-air duct;
• the size of the main ducts;
• branches;
• dampers;
• the condition of the ducts;
• available airflow;
• restrictions;
• the filter;
• static pressure.

An indoor unit capable of moving 1,601 CFM will not deliver its expected performance if the existing installation cannot allow this air to circulate properly.

An undersized return-air duct, for example, can create grille noise and reduce the actual airflow through the evaporator.

An indoor vertical unit more than 52 inches tall

The documentation specifies the following for the indoor unit:

21.02 in wide × 24.49 in deep × 52.99 in high.

It weighs approximately 162.92 lb.

These dimensions must be compared with the existing mechanical space.

In many properties in Greater Montreal, central installations are located:

• in the basement;
• in a mechanical room;
• in a closet;
• in a relatively narrow space near the water heater.

Before replacement, we check not only whether the unit physically fits in the space, but also whether it can be properly serviced after installation.

Access to the filter, service panels, drain, and internal components must be provided.

An outdoor unit weighing more than 200 lb

The outdoor unit measures approximately 38.58 × 16.34 × 38.39 in and weighs approximately 201.06 lb. The stated outdoor sound level is 65 dB(A).

It is therefore a genuine high-capacity central unit.

Its location must take into account:

• snow;
• defrost cycles;
• drainage;
• required clearances;
• the surroundings;
• access for maintenance;
• the strength of the support or base;
• the manufacturer's clearances.

On the North Shore and South Shore, snow accumulation can make poor placement particularly problematic in winter.

3/8 in – 3/4 in piping

The AirGreen specifications indicate refrigerant connections of 3/8 in – 3/4 in.

At this capacity, the gas line diameter is important and directly affects the installation work.

When replacing an old central system, we therefore always check whether the existing refrigerant lines can be reused in accordance with the applicable requirements or whether they must be replaced.

The fact that an old heat pump is also advertised as “four tons” does not automatically guarantee piping compatibility.

R-454B: a new generation of refrigerant

The manufacturer's documentation indicates a charge of approximately 134.04 oz of R-454B for this system.

R-454B is one of the A2L refrigerants used in new generations of HVAC equipment.

For us, this means that commissioning must follow procedures appropriate to the product:

• proper refrigerant handling;
• compatible tools;
• leak testing;
• vacuum evacuation;
• connection inspection;
• load verification based on the installation;
• validation of operating temperatures and pressures.

A central system of this capacity should never be treated as a simple mechanical replacement where the lines are quickly connected and the job is considered done.

MCA of 38 A and maximum protection of 40 A

The SENDC-48HF requires a 208/230 V, single-phase, 60 Hz power supply.

The technical data indicates:

• MCA: 38 A
• maximum protection: 40 A

These values concern the main equipment and must be incorporated into the project's complete electrical analysis.

When auxiliary heating is added, its electrical demand must also be taken into account.

This is particularly important in a fully electric home with:

• water heater;
• stove;
• dryer;
• charging station;
• auxiliary heating;
• other major loads.

Dehumidification: approximately 3.85 L/h

The documentation indicates a moisture removal capacity of 3.85 L/h, or approximately 8.14 pints per hour.

In a central home, this point is particularly relevant during the hot and humid periods of July and August.

A properly sized system must run long enough to remove moisture from the air.

This is another reason why oversized equipment is undesirable: if it cools too quickly and then stops frequently, humidity control may be less effective.

Wall-mounted thermostat and optional WiFi

The documentation specifies that the system uses a wall-mounted thermostat.

The AirGreen specification, for its part, indicates that WiFi is available as an option.

For a central installation, the thermostat becomes an important part of daily operation. It should be installed in a location representative of the home's overall temperature, away from a direct heat source, an exterior door, or a draft.

ENERGY STAR: a detail that must be confirmed for the exact combination

The information provided reveals a particular inconsistency here.

The AirGreen sheet indicates Energy Star: No, while also displaying an Energy Star number, 3649598, and the designation “Cold Climate: Yes.”

Meanwhile, page 2 of the brochure visually displays an ENERGY STAR Certified badge in the product overview section, while the brochure's “Documentation and Certifications” section mainly cites the AHRI certification and the EnergyGuide label.

To avoid any confusion, we recommend confirming the certification applicable to the exact combination SENDC-48HF-OG + SENDC-48HF-IG, AHRI 215735329 at the time of quotation.

For rebates, it is always the specific combination and its official eligibility that must be verified.

Displayed rebate of $4,740

The AirGreen product sheet provided for this heat pump indicates a $4,740 provincial rebate.

An amount of this significance can completely transform the net cost of a central-system project.

However, we never recommend making a purchase decision based solely on an amount shown. Financial assistance programs may change, and eligibility must be confirmed with:

• the indoor and outdoor models;
• the AHRI number;
• the property;
• the rules in effect at the time of installation.

Warranty: a difference to clarify before purchase

The AirGreen product sheet provided with the product indicates a warranty of:

10 years compressor – 10 years parts – 0 years labor.

The Senville brochure currently attached instead indicates:

10 years on the compressor and 5 years on the parts.

The technical table repeats the same 10-year compressor / 5-year parts coverage.

The applicable warranty terms for the system sold by AirGreen must therefore be confirmed. Extended coverage may depend on the distributor, the warranty program, appliance registration, or other commercial conditions.

Labor also remains separate coverage from the manufacturer's parts warranty.

A typical scenario: replacing an old central heat pump without redoing the entire house

A common scenario in our central-system projects is a house that already has a duct network in good condition, but whose outdoor condenser and indoor equipment are aging.

The owner does not want to install multiple wall-mounted heads in the different rooms. They prefer to continue using:

• the same grilles;
• the same ducts;
• the same central thermostat principle;
• a single outdoor unit.

In this configuration, an inverter heat pump such as the SENVILLE SENDC-48HF can be very appealing.

But before confirming the replacement, we must always check the airflow, system capacity, available electrical power, and the building’s heat loss.

We have seen enough central systems to know that a successful installation rarely depends on a single number printed on the box.

Why choose AirGreen for a 4-ton SENVILLE central heat pump

A central installation requires more coordination than a simple wall-mounted unit.

At AirGreen, we examine the project as a whole:

• capacity sizing;
• ductwork condition;
• airflow;
• static pressure;
• air return;
• plenum connection;
• electrical supply;
• auxiliary heating sizing;
• refrigerant piping;
• drainage;
• condenser location;
• thermostat;
• commissioning;
• winter performance;
• eligibility for rebates.

For a property in Montreal, Laval, Longueuil, the North Shore, the South Shore, or Montérégie, this approach helps avoid a costly mistake: installing technically high-performing equipment on infrastructure that is not suitable.

Our assessment of the SENVILLE SENDC-48HF

The SENVILLE 4-ton central system – 48,000 BTU offers an interesting technical combination for a replacement or modernization project:

• 48,000 BTU of nominal cooling capacity;
• up to 50,000 BTU of nominal heating capacity according to the brochure;
• operation advertised down to -30 °C;
• capacity of 46,000 BTU/h at -15 °C according to the data provided;
• SEER2 of 16.5;
• HSPF2 of 9.5;
• inverter technology;
• up to 1,601 CFM;
• refrigerant R-454B;
• auxiliary heating available;
• piping 3/8 in. – 3/4 in.;
• Wi-Fi available as an option.

Its value is particularly clear when a home already has a well-designed ductwork system and the owner wants to maintain consistent whole-home comfort while replacing an older installation.

The correct capacity must nevertheless be confirmed before the work begins. A four-ton heat pump is not automatically the right solution just because the old unit was also four tons.

For a quote, an inspection of your ductwork, or the replacement of your existing central system, contact AirGreen. We install and service central heat pumps in Montreal, Laval, Longueuil, on the North Shore and South Shore, with a complete assessment of the heating, air conditioning, electrical, and air distribution systems before installation.