1-Way Ceiling Cassette SENVILLE SENA R454B | 9000 BTU

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• Federal Rebate:
• Provincial Rebate: $
• Energy Star®: Oui
• WiFi: En Option
• AHRI: 216623593
• Efficiency: 24.0 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 9,000 BTU 1-way cassette designed for rooms with limited wall space, with heating down to -30 °C

The SENVILLE SENA R454B 9,000 BTU 1-Way Ceiling Cassette meets a need we regularly encounter in HVAC installations in Montreal, Laval, Longueuil, on the South Shore and the North Shore: efficiently cooling and heating a room without installing a conventional wall-mounted unit in plain sight.

This configuration pairs the SENA-09HF-OG outdoor unit with the SENA-09HF-1WCG indoor unit, under reference AHRI 216623593. Senville documentation presents the model as a 1-Way ceiling cassette, meaning it primarily distributes air in one direction, with a rated cooling capacity of 9,000 BTU.

This format is very different from a square four-way cassette. The indoor unit is long and relatively slim, allowing it to fit into certain ceiling configurations where a traditional square cassette would be less suitable.

For the 9,000 BTU version, the AirGreen specifications state, among other things:

• outdoor unit: SENA-09HF-OG;
• indoor unit: SENA-09HF-1WCG;
• AHRI: 216623593;
• R-454B;
• ENERGY STAR®: yes;
• Cold Climate: yes;
• SEER2: 24.0;
• EER2: 14.6;
• HSPF2-4: 12.1;
• heating down to -30 °C;
• 9,000 BTU/h at -8 °C;
• 10,600 BTU/h at -15 °C;
• 5,100 BTU/h maximum at -30 °C;
• Optional WiFi;
• power supply 208/230 V;
• piping 1/4 in – 3/8 in;
• MCA 15 A / MOP 15 A.

The technical table in the brochure specific to the SENA-09HF-1WC confirms, among other things, a 208/230 V single-phase power supply, a cooling capacity of 9,000 BTU, a SEER2 of 24.0, an EER2 of 14.6, a rated heating capacity of 10,900 BTU, an HSPF2-4 of 12.1, and a rated COP of 3.71.

What really distinguishes a 1-way cassette from a conventional square cassette

A four-way cassette installed near the center of a room generally distributes air across several sides. The SENVILLE 1-Way cassette takes a different approach: its rectangular format allows it to project air mainly in a chosen direction.

This can be particularly useful in:

• a long bedroom;
• a rectangular office;
• a meeting room;
• a widened corridor;
• a narrow commercial space;
• a space where the unit must be placed near one side of the ceiling rather than exactly in the center.

The main benefit is therefore not merely aesthetic. It also concerns how the air is distributed.

In a long room, a poorly chosen cassette may send a great deal of air around its installation point without properly reaching the opposite end. A 1-way cassette, by contrast, can be oriented to promote more longitudinal airflow.

An indoor format very different from square cassettes

The documentation specifies the following for the indoor cassette:

50.31 in. wide × 13.19 in. deep × 8.98 in. high.

This long, shallow geometry explains the model’s appeal.

However, “only 8.98 inches high” should not be confused with “easy to install in every ceiling.”

Before installing a ceiling cassette, we must check:

• the direction of the joists;
• the free space above the drywall;
• plumbing pipes;
• electrical cables;
• ventilation ducts;
• the structure;
• the drain route;
• future access for servicing.

In some Montreal buildings, the ceiling may appear thick enough from the room, but the available structure does not allow a unit more than 50 inches long to be inserted in the desired direction.

Why this configuration can be particularly useful in a renovation

Let’s consider a representative scenario.

A renovated bedroom has a large window on one wall, a closet on the second, a headboard on the third, and built-in furniture on the last.

A wall-mounted heat pump could be installed, but its location would be dictated by constraints rather than optimal air circulation.

A 1-way ceiling cassette completely frees up the walls and allows the airflow to be directed along the length of the room.

This is exactly the kind of situation where the ceiling becomes a much more logical location than the wall.

9,000 BTU: a capacity suited to small and medium-sized rooms

The brochure describes this model as suitable for spaces of approximately 250 to 400 sq. ft., including bedrooms, offices, and studios.

At AirGreen, we use this range as an indication only.

A 350 sq. ft. room may require significantly more or less than 9,000 BTU depending on:

• window area;
• sun exposure;
• insulation;
• ceiling height;
• the number of exterior walls;
• the floor;
• air infiltration;
• the room’s use.

A south-facing room with large windows can have a much higher cooling load than a better-protected interior room.

SEER2 24.0: the key technical specification for this 9,000 BTU version

The brochure contains a particular detail here that is best explained clearly.

The general commercial section of the page mentions 20.5 SEER for the series.

However, the detailed technical table specific to the SENA-09HF-1WC indicates SEER2 24.0, a value that also matches the AirGreen specifications.

For this specific 9,000 BTU combination, we therefore use SEER2 24.0 as the model-specific figure.

The same table indicates:

• EER2 14.6;
• HSPF2-4 12.1;
• Rated COP 3.71.

These are interesting figures for a small ceiling heat pump designed to operate for both cooling and heating.

Heating down to -30 °C, but with capacity that varies according to temperature

Senville clearly indicates heating operation down to -22 °F, or approximately -30 °C.

The AirGreen specifications nevertheless provide further detail by listing the actual capacities at several temperatures:

At -15 °C, the available capacity therefore remains higher than the 9,000 BTU associated with the rated cooling capacity.

At -30 °C, the unit continues to produce heat, but its maximum capacity decreases significantly.

What the 5,100 BTU figure at -30 °C actually means

Imagine that a room loses 7,500 BTU/h when the outdoor temperature reaches -30 °C.

If the heat pump can then produce approximately 5,100 BTU/h maximum, about 2,400 BTU/h of heat loss remains to be covered by another heating source.

That is why we never present the statement “heating down to -30 °C” as a guarantee that the unit can heat any room on its own at that temperature.

Sizing must compare:

1. the heat pump’s available capacity;
2. the space’s actual heat loss;
3. the outdoor temperature.

This analysis is particularly important in Montréal, Laval, Longueuil, on the North Shore and the South Shore, where winter temperatures can vary considerably.

Cold Climate and ENERGY STAR®

The documentation presents the system as ENERGY STAR®-certified and capable of operating in heating mode down to -30 °C.

The AirGreen specifications also identify it as Cold Climate.

This allows this ceiling cassette to be considered as more than just a summer cooling solution. When properly sized, it can provide a significant portion of the room’s seasonal heating.

Installation, R-454B, and maintenance: why a 1-way cassette requires more preparation than a wall-mounted unit

A 50-inch cassette requires choosing the correct orientation before opening the ceiling

The first issue is physical.

The indoor unit is more than 50 inches long.

We must therefore determine not only where the cassette will be visible, but also in which direction the unit body can be positioned above the ceiling.

A 90-degree difference in orientation can make the difference between a simple installation and an impossible one because of the joists.

Drainage is one of the most sensitive aspects of a cassette

Every heat pump produces condensation in cooling mode.

With a wall-mounted head installed on an exterior wall, the drain can sometimes exit almost directly outdoors.

With a cassette located farther into the room, it is often necessary to travel several feet before reaching a drainage point.

We must therefore examine:

• the available slope;
• the unit height;
• the pipe route;
• obstacles;
• future access;
• the possibility of servicing.

A ceiling drainage problem can have much more serious consequences than an improperly positioned wall drain, since a leak can damage the drywall, paint, or furniture located directly below the unit.

R-454B and precharge for 25 feet

The cassette operates with R-454B.

The documentation indicates that the system is precharged for piping up to 25 feet. An installation with a 50-foot set requires refrigerant to be added on site.

The AirGreen specifications indicate piping:

1/4 in – 3/8 in.

The manufacturer’s table confirms these diameters for the 9,000 BTU model:

• liquid line: 1/4 in
• gas line: 3/8 in.

Why the piping route may be longer than with a wall-mounted heat pump

A ceiling cassette is not necessarily located near an exterior wall.

The refrigerant circuit may need to:

• pass through the ceiling;
• go around a beam;
• run down inside a wall;
• reach the outdoor unit on another level.

The visual distance between the two units is therefore never sufficient to estimate the piping length.

At AirGreen, we plan this routing before the finishing work when the project allows.

Power supply: 208/230 V

The technical documentation indicates a power supply:

208/230 V, 60 Hz, single-phase.

The AirGreen specifications also indicate:

MCA: 15 A

MOP: 15 A.

This information must be verified against the nameplate of the equipment actually delivered before the final electrical installation.

The outdoor unit remains relatively compact

The outdoor unit associated with the 9,000 BTU model measures approximately:

31.69 in × 12.99 in × 21.81 in.

This format facilitates certain residential installations where available space is limited.

As always, the necessary clearances around the unit must nevertheless be respected, and the following must be taken into account:

• windows;
• neighbors;
• snow;
• drainage;
• access for servicing.

Automatic vertical louver and manual horizontal orientation

The AirGreen specification sheet states:

• vertical louver: automatic
• horizontal orientation: manual

This configuration is consistent with the logic of a 1-way cassette: we carefully determine the airflow direction to send air where it is needed, then the automatic vertical louver adjusts the projection.

In a long room, this orientation must be considered when choosing the location.

Optional WiFi

WiFi is available as an option according to the AirGreen specification sheet.

For an office, commercial space, or intermittently used room, this function can facilitate:

• remote adjustment;
• schedules;
• adjusting it before arrival;
• reducing the setpoint during an absence.

We recommend specifying this option in the quote if it is an important criterion.

Self-diagnostics, leak detection, and self-cleaning

The brochure mentions several useful functions:

• leak detection;
• diagnostic display;
• self-cleaning mode;
• inverter technology;
• low-temperature operation;
• Follow Me function;
• self-diagnostic system.

These functions can facilitate operation and certain diagnostics, but they do not replace HVAC maintenance.

The cassette must remain accessible for:

• clean the filters;
• inspect the heat exchanger;
• check the drain;
• work on the internal components.

A common mistake: recessing the unit without considering future servicing

A cassette that is perfectly integrated visually but difficult to access represents a poor installation choice.

We want to know from the outset:

• how to remove the filter;
• how to access the condensate pan;
• how to inspect the drain;
• how to access the connections;
• how to replace a part without demolishing the ceiling.

This point is particularly important in a newly renovated commercial space or residence.

Warranty: a discrepancy between the AirGreen specification sheet and Senville documentation

The AirGreen specification sheet states:

10-year compressor – 10-year parts – 0-year labor

with the possibility of additional warranty coverage.

The Senville brochure instead specifies 10 years on the compressor and 5 years on parts.

This difference must be validated according to AirGreen’s terms, the registration, and the program applicable to the equipment sold.

We prefer to clearly confirm the actual coverage in the quote rather than leave the owner to interpret a simple “10-year warranty” mention.

When we particularly recommend the SENVILLE 9,000 BTU 1-way cassette

This configuration becomes particularly appealing when:

• available wall space is limited;
• the room is long or rectangular;
• primarily directional air projection is desired;
• the ceiling allows a 50.31 in unit to be recessed;
• a small-capacity heat pump is genuinely suited to the load;
• the owner is seeking an ENERGY STAR® and Cold Climate solution;
• heating down to -30°C is an advantage;
• the room's aesthetics favor a ceiling installation.

When a wall-mounted unit remains the more logical choice

The cassette is not automatically the best solution.

A wall-mounted heat pump may be preferable when:

• there is no accessible space above the ceiling;
• the joists prevent integration;
• drainage is too complex;
• the finished ceiling must not be opened;
• a suitable wall location already exists.

In this case, spending more on ceiling work to install a cassette does not necessarily produce a better result.

Why entrust this type of installation to AirGreen

A 1-way ceiling cassette requires precise coordination between the mechanical systems, ceiling, drainage, refrigerant piping, and electrical work.

At AirGreen, we specifically check:

1. the room's heating and cooling load;
2. the optimal air-distribution location;
3. the joists' orientation;
4. the available ceiling depth;
5. drainage;
6. the line length;
7. the 1/4 in – 3/8 in piping;
8. the electrical supply;
9. the outdoor unit location;
10. future access for maintenance.

We carry out HVAC projects in Montreal, Laval, Longueuil, on the South Shore, the North Shore, and in Montérégie, both in residential properties and commercial spaces where a ceiling cassette offers a concrete advantage.

The SENVILLE SENA R454B 9,000 BTU 1-Way Cassette combines a very slim indoor unit, a 24.0 SEER2, a 14.6 EER2, a 12.1 HSPF2-4, 1/4 in – 3/8 in piping, ENERGY STAR certification, and heating operation down to -30°C. The manufacturer's technical table confirms these specifications precisely for the 9,000 BTU version.

Contact AirGreen for a quote on the SENVILLE SENA R454B 9,000 BTU 1-way ceiling cassette, to check whether your ceiling is suitable for this type of installation, and to plan a complete HVAC project in Montreal, Laval, Longueuil, on the South Shore or the North Shore.