1-Way Ceiling Cassette SENVILLE SENA R454B | 12000 BTU

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• Federal Rebate:
• Provincial Rebate: 1152$
• Energy Star®: Oui
• WiFi: En Option
• AHRI: 216623594
• Efficiency: 23.0 SEER
• Warranty (Compressor - Parts - Labor): 10-10-0
• Additional Warranty (10-10-10): Possible
• Voltage: 220V
• Sound Pressure Level (Outdoor): dB(A)
• Gas (Freon): R-454B

A linear cassette designed for rooms where air distribution should follow the architecture rather than occupy it

The SENVILLE SENA R454B 12,000 BTU 1-Way Ceiling Cassette offers a very different solution from a traditional wall-mounted heat pump. Here, the indoor unit does not occupy a wall above a window, sofa, or piece of furniture: it is integrated into the ceiling and distributes air primarily in one direction. This design can be particularly appealing for certain residential renovations, offices, businesses, wide corridors, rectangular rooms, and spaces where the interior layout leaves little available wall space.

The combination presented by AirGreen pairs the SENA-12HF-OG outdoor unit with the SENA-12HF-1WCG indoor unit, under AHRI 216623594. Senville documentation identifies the family as SENA-12HF-1WC and presents it as a 12,000 BTU 1-way ceiling cassette operating in both cooling and heating modes.

For our HVAC projects in Montreal, Laval, Longueuil, on the South Shore and the North Shore, this type of unit becomes especially appealing when we want to keep the walls clear while achieving more structured air distribution. However, its selection requires thorough preparation: ceiling space, service access, piping, drainage, and the exact position of the air outlet must all be considered before work begins.

Key specifications of the SENVILLE 12,000 BTU 1-Way

The AirGreen information sheet for this combination indicates, among other things:

• cooling capacity: 12,000 BTU
• SEER2: 23.0
• EER2: 13.0
• HSPF2: 10.0
• refrigerant: R-454B
• ENERGY STAR: yes
• Cold Climate: yes
• heating down to -30 °C
• WiFi available as an option
• power supply 220 V
• piping 1/4 in. – 3/8 in.
• MCA: 15 A
• MOP: 15 A
• advertised provincial rebate: 1 152 $

Senville’s technical table confirms that the 12,000 BTU model has a SEER2 of 23.0, an EER2 of 13, a Region 4 HSPF2 of 10.0, a rated heating capacity of 12,500 BTU/h, and a rated COP of 3.56.

Why the 1-way design truly changes how the installation is planned

The cassette measures approximately 50.31 in. wide × 13.19 in. deep × 8.98 in. high.

This long, narrow geometry immediately distinguishes it from a conventional square cassette.

A four-way cassette is often positioned closer to the center of a room to distribute air in several directions. A 1-way cassette is better suited to configurations where air needs to be directed along a primary axis—for example, along a long room, from a peripheral area, or in a narrower space.

In a well-designed project, this feature can be an advantage. In a poorly planned project, it can become a limitation.

We therefore want the air directed toward the area being conditioned, rather than toward a wall located a few feet from the cassette.

An example of a configuration where this cassette makes a great deal of sense

Let’s consider a large rectangular room in a condo in Montreal.

One side of the room is occupied by a bay window. The other side contains cabinets and decorative elements. Installing a visible wall-mounted head becomes difficult without compromising the layout.

A 1-way cassette installed in the ceiling can free up these surfaces while directing air along the length of the room.

This is precisely the type of situation in which we prefer to consider the building’s geometry before its simple rated capacity.

12,000 BTU does not automatically mean that it is suitable for every room requiring 12,000 BTU

Senville’s documentation recommends this product family for spaces of approximately 400 to 600 sq. ft.

This figure should be used as a reference, not as a sizing formula.

A 500 sq. ft. living room on the top floor with large southwest-facing windows may have a much higher heating and cooling load than an office of the same size on the ground floor.

At AirGreen, we take the following factors into account:

• insulation;
• windows;
• solar exposure;
• the ceiling height;
• the floor;
• the room layout;
• the number of occupants;
• equipment that produces heat.

SEER2 of 23: solid seasonal efficiency

The SEER2 of 23 is one of the key technical features of this 1-way cassette.

The series’ general documentation also highlights its high efficiency and ENERGY STAR certification.

For the homeowner, this mainly means that the system belongs to a category in which seasonal cooling consumption is optimized by inverter technology.

However, SEER2 figures alone should not be compared between completely different system designs. A ceiling cassette is not chosen solely for its energy efficiency. Its integration into the room, placement, and air distribution are also decisive.

Heating down to -30 °C: actual capacities matter more than the minimum limit

The AirGreen specification sheet lists the following capacities:

• approximately 9,600 BTU/h at -8 °C
• approximately 11,500 BTU/h at -15 °C
• approximately 5,100 BTU/h at -30 °C

The stated COP is approximately:

• 2.65 at -8 °C
• 1.09 at -30 °C

The brochure confirms that the series is designed to operate in heating mode down to -30 °C.

This is an essential nuance.

A heat pump can continue operating at -30 °C without retaining its full rated capacity.

At this extreme temperature, the building’s demand increases while the heat pump’s available capacity decreases. For a home in Laval, Longueuil, or on the North Shore, a supplementary heating source may therefore still be necessary on the coldest days.

A relevant Cold Climate certification for Quebec

The AirGreen specification sheet identifies this combination as Cold Climate: yes, and Senville also presents the series as a heat pump intended for low-temperature heating.

This distinguishes the model from an air conditioner with only an occasional heating function.

For a homeowner looking to reduce the use of electric baseboard heaters during much of the winter, this distinction may be particularly valuable.

Low-ambient-temperature air conditioning may also be of interest to certain businesses

The brochure mentions a low-ambient-temperature air conditioning function down to -30 °C.

In a residence, this feature is rarely a priority.

In some commercial or technical spaces, however, a room may need cooling even when the outdoor temperature is low because of:

• equipment;
• servers;
• lighting;
• high occupancy;
• internal heat gains.

This feature can therefore offer real value depending on the application.

Inverter technology: the system does not operate at full capacity constantly

The brochure clearly identifies inverter technology among the main features.

Instead of constantly switching between off and full power, the compressor can modulate its operation according to demand.

In a medium-sized space, this may promote:

• more stable temperature;
• quieter operation;
• longer cycles;
• energy consumption better matched to the actual load.

Follow Me function: the temperature can be measured closer to the occupant

The documentation mentions a remote control with the Follow Me function.

This feature may be useful with a ceiling cassette.

The temperature near the ceiling may differ from the temperature felt at the level where occupants are located. By using a sensor built into the remote control as intended by the manufacturer, the system can take a measurement that more accurately represents the occupied zone.

Self-diagnostics, leak detection, and self-cleaning mode

Senville mentions several functions intended to simplify operation and maintenance:

• refrigerant leak detection;
• diagnostic display;
• self-cleaning mode;
• self-diagnostic system.

These functions can help identify certain problems more quickly.

However, they do not replace professional HVAC maintenance.

A system may lose performance because of a filter, drain, sensor, refrigerant charge issue, or electronic component. A diagnostic code is an indication, not always the complete diagnosis.

A one-way cassette requires more careful planning than a wall-mounted unit

The ceiling must provide sufficient technical space

The unit is approximately 8.98 inches high.

This does not mean that a nine-inch ceiling cavity is automatically sufficient.

We must also plan for:

• the refrigerant connections;
• the drain;
• the cables;
• clearances;
• the support;
• future access.

In a Montreal renovation, the visually ideal location may have a joist, beam, or duct above the ceiling.

The best installation is therefore determined after inspecting what is actually located in the cavity.

The 50-inch length must be planned before opening the ceiling

An indoor unit 50.31 inches long requires a sufficiently clear, continuous area.

It is much longer than a compact square cassette.

Before cutting anything, we check:

• joist locations;
• plumbing;
• cables;
• existing ducts;
• light fixtures;
• sprinklers;
• ceiling structure.

Moving it a few inches at the beginning of the project can prevent many modifications after the opening is made.

Drainage is one of the most important elements

A cassette is installed above the occupied space.

An improperly controlled condensate leak can therefore damage:

• ceiling;
• paint;
• furniture;
• finishes.

That is why the drain route must be designed before the finishing is closed up.

Whenever possible, we favor a simple, accessible route and avoid paths that unnecessarily complicate maintenance.

R-454B precharged for 25 feet

Senville documentation states that the system is precharged with R-454B for a length of up to 25 feet. An installation using 50 feet of piping requires the installer to add refrigerant.

The piping specified for the 12,000 BTU model is:

• 1/4 in. liquid
• 3/8 in. gas

Since R-454B is an A2L refrigerant, commissioning must be carried out using appropriate methods and equipment.

Why evacuation remains essential

The factory charge is contained in the outdoor unit.

The piping installed on site initially contains air and moisture.

A proper installation therefore requires, among other things:

• connection inspection;
• leak test;
• evacuation;
• commissioning;
• operation check.

Improper circuit preparation can reduce performance and adversely affect the system's service life.

208/230 V power supply

The technical table indicates a 208/230 V, 60 Hz, single-phase power supply.

The AirGreen product sheet specifies:

• MCA: 15 A
• MOP: 15 A

These values remain relatively modest for a 12,000 BTU system, but the circuit must obviously be prepared in accordance with the nameplate data and the site's electrical requirements.

Compact outdoor unit to facilitate urban installations

The outdoor unit measures approximately 31.69 × 12.99 × 21.81 in according to the 12,000 BTU model table.

This size can facilitate certain installations in side yards or on properties where available space is limited.

We must nevertheless comply with:

• clearances;
• snow;
• water drainage;
• the neighbors;
• municipal regulations;
• future access.

Optional WiFi

The AirGreen product sheet indicates that WiFi is available as an option.

In a residence, this can simplify scheduling.

In an office or small business, remote control can be even more useful by allowing the temperature to be managed according to occupancy hours.

Why choose a 1-way cassette instead of a square cassette

The two products are not intended for exactly the same configurations.

A conventional square cassette may be preferable when it is installed in the center of a room and you want to distribute air around it.

The 1-way cassette makes more sense when you want to direct airflow in a primary direction and take advantage of its linear format.

A good example would be a long room, a room located along a glass façade, or a space where integrating a central square cassette would be difficult.

Poor orientation can cancel out the advantage of the 1-way format

The name “1-way” should be taken seriously.

If the unit is positioned so that it sends its air directly toward a nearby wall, part of its potential range will be lost.

The AirGreen product sheet indicates:

• vertical louver: automatic
• horizontal louver: manual

This allows for certain adjustments, but the initial positioning remains crucial.

At AirGreen, we therefore analyze the airflow direction before deciding precisely where to open the ceiling.

Displayed provincial rebate: $1,152

The AirGreen product sheet indicates a $1,152 provincial rebate for this combination.

It also displays:

• ENERGY STAR: yes
• Cold Climate: yes
• ENERGY STAR ID: 3893584
• AHRI: 216623594

Senville documentation confirms the series' ENERGY STAR certification.

However, all financial incentives must be validated at the time of quoting according to the rules of the program in effect and the exact installed configuration.

Warranty: a difference between the AirGreen product page and Senville documentation

The AirGreen product page lists a manufacturer's warranty:

10-year compressor – 10-year parts – 0-year labour.

The Senville brochure instead states:

10 years on the compressor and 5 years on parts.

It is therefore important to confirm the exact coverage applicable to the product sold by AirGreen, including any registration requirements.

Which projects is this SENVILLE cassette particularly well suited for?

We consider it particularly suitable for:

• a living room or living area where the walls need to remain clear;
• an office;
• a commercial space;
• a rectangular room;
• a renovation with a suspended ceiling;
• a room with large windows;
• an installation where directional airflow is advantageous.

It is less suitable when the ceiling provides no access or when the structure requires too many modifications.

What we check at AirGreen before confirming the installation

For a ceiling cassette installation in Montreal, Laval, Longueuil, on the South Shore, or on the North Shore, we assess in particular:

1. the room's heating and cooling load;
2. available space in the ceiling;
3. joist positioning;
4. airflow direction;
5. drainage;
6. piping length;
7. electrical supply;
8. outdoor unit location;
9. future access;
10. applicable financial incentives.

This preparation is particularly important for a cassette because several components become invisible once the ceiling is closed.

Our assessment of the SENVILLE SENA 12,000 BTU 1-way cassette

The SENA-12HF-1WC / SENA-12HF-1WCG offers an interesting combination for a discreet, directional installation:

• 12,000 BTU in cooling
• 12,500 BTU nominal heating capacity according to the brochure
• SEER2 of 23
• EER2 of 13
• HSPF2-4 of 10
• heating down to -30 °C
• ENERGY STAR
• Cold Climate
• R-454B
• self-cleaning function
• leak detection
• self-diagnostics
• Follow Me function
• low-temperature cooling
• an indoor unit format of only 8.98 in. in height

The value of this cassette therefore does not rest solely on its performance figures. It lies primarily in its ability to fit into a ceiling and condition the space without occupying a wall.

For a quote on a SENVILLE SENA 12,000 BTU 1-way ceiling cassette, contact AirGreen. We can assess the ceiling structure, required capacity, drainage, airflow direction, and applicable financial incentives for your project in Montreal, Laval, Longueuil, on the North Shore, or on the South Shore.