SENVILLE R454B 4-Zone Heat Pump | 36000 BTU

A 36,000 BTU multi-zone solution for distributing comfort across four rooms without multiplying the number of outdoor units

The SENVILLE R454B 36,000 BTU 4-Zone Heat Pump addresses a problem we regularly encounter at AirGreen in homes, condos, duplexes, and small buildings in Montreal, Laval, Longueuil, the South Shore, and the North Shore: several rooms need independent temperature control, but installing three or four outdoor units on the property would be cumbersome, unattractive, or simply impossible.

The heart of the system is the SENA-36HF-MOA outdoor unit. Its technical specifications indicate that it can supply two to five zones, making it fully compatible with a project involving four indoor units when the selected combination complies with the manufacturer's limits.

This flexibility is particularly valuable in a home with multiple bedrooms, a floor divided into offices, a duplex where certain zones are difficult to balance, or a ground floor and upper floor with very different heating and cooling needs.

Instead of trying to move air from a single wall-mounted head through doors, corridors, and stairways, we can distribute the available capacity directly where it is needed.

The AirGreen configuration notably features:

• Outdoor unit: SENA-36HF-MOA
• AHRI: 215735317
• Rated capacity: 36,000 BTU
• SEER2: 23.0
• EER2: 13.0
• HSPF2: 10.7
• R-454B
• ENERGY STAR: yes
• Cold Climate: yes
• heating down to -30 °C
• Wi-Fi included
• power supply 220 V
• MCA: 37 A
• MOP: 40 A
• outdoor sound level: 65 dB(A)
• max outdoor airflow: approximately 3,038 CFM
• displayed provincial rebate: 4 560 $

The official brochure confirms that the SENA-36HF-MOA has a capacity of 36,000 BTU, a SEER2 of 23, an EER2 of 13, an HSPF2 Region 4 of 10.7, a 208/230 V power supply, and compatibility with 2 to 5 zones.

The brochure shows two zones, but the outdoor unit can support up to five.

The first page of the documentation presents a commercial configuration in dual zone, with two 18,000 BTU indoor units.

This image can be confusing if you look only at the photo.

The most important information is found in the technical table: the SENA-36HF-MOA outdoor model is designed for 2 to 5 zones.

This means that a four-zone system is entirely possible, but the compatible indoor units must be selected and the combinations approved by Senville must be followed.

At AirGreen, we never design a multi-zone system by arbitrarily adding four heads.

We check:

• the capacity required by each room;
• the compatible indoor models;
• the sum of the connected rated capacities;
• the manufacturer’s combination limits;
• piping lengths;
• the available capacity when multiple zones simultaneously require heating or cooling.

36,000 BTU does not mean 9,000 BTU guaranteed in each of the four rooms

This is an essential point to understand before purchasing a four-zone heat pump.

The system does not automatically divide 36,000 BTU into four fixed 9,000-BTU portions.

Capacity is dynamically shared among the indoor units according to their demands.

The brochure states:

• 36,000 BTU/h of rated cooling capacity;
• cooling range of 9,000 to 43,000 BTU/h;
• 36,000 BTU/h of rated heating capacity;
• heating range of 10,000 to 44,000 BTU/h.

This modulation range allows the inverter compressor to adjust its output.

If only two small bedrooms need cooling, the system can operate at a lower capacity. If several zones require substantial heating at the same time, it increases its output within the available limits.

This is precisely the behavior that makes a multi-zone platform appealing.

A concrete example: four rooms that never have exactly the same needs

Let’s take a typical South Shore home with:

• a primary bedroom on the second floor;
• two secondary bedrooms;
• an office on the ground floor.

The west-facing bedroom can become very hot around 4 p.m. in July, while the north-facing office remains relatively cool.

In the evening, the situation changes: the office is no longer in use, but the three bedrooms need to be comfortable for the night.

A four-zone system concentrates capacity where it is actually needed rather than sending exactly the same amount of air everywhere.

Why four zones can be more effective than one very large head

A common mistake is to believe that a high-capacity wall-mounted unit installed in a hallway can serve an entire floor.

On paper, the BTUs may seem sufficient.

In reality, doors and walls limit air circulation.

A 24,000- or 36,000-BTU head can cool the hallway perfectly while leaving a closed bedroom too warm.

With four indoor units, the system directly serves the rooms.

This improves:

• distribution;
• temperature precision;
• nighttime comfort;
• flexibility of use;
• room-by-room control.

SEER2 of 23: highly attractive seasonal efficiency for a multi-zone system

The brochure indicates a SEER2 of 23 and an EER2 of 13.

For a 36,000 BTU multizone heat pump, this efficiency level is particularly noteworthy.

ENERGY STAR certification is also indicated in the Senville presentation.

A high SEER2 means that, over the entire cooling season, the unit can provide substantial cooling relative to the electrical energy consumed.

However, this figure should not be turned into a promise about the electricity bill.

Actual consumption depends on:

• insulation;
• window orientation;
• the requested temperature;
• the number of active zones;
• occupancy habits;
• outdoor conditions;
• the quality of the installation.

HSPF2 of 10.7 and operation down to -30 °C

The SENA-36HF-MOA belongs to the Cold Climate system category.

The brochure states that it provides heating down to -30 °C and describes this series as optimized for cold climates.

The AirGreen specifications provide particularly interesting data at winter temperatures:

• approximately 38,000 BTU/h at -8 °C;
• approximately 36,000 BTU/h at -15 °C;
• up to 22,400 BTU/h at -30 °C.

The stated COP is approximately:

• 2.12 at -8 °C;
• approximately 1.47 at -30 °C.

This information is more useful than simply stating “operates down to -30 °C.”

At -30 °C, the system continues to heat, but its available capacity is lower than when the outdoor temperature is higher.

Why multizone heating must be calculated room by room

With a four-zone system, we do not want to know only whether the outdoor unit can produce 22,400 BTU at -30 °C.

We need to determine how these BTUs will be distributed.

If all four rooms require substantial heating at the same time, the total available capacity must be shared.

For an older home in Montreal, with less efficient windows and colder walls, this simultaneity can become important during severe cold.

That is why we assess the heat loss of each zone before recommending the indoor-unit combination.

The major advantage of a four-zone system: individual room control

In a family home, not all rooms should necessarily operate at the same temperature.

A child's bedroom can be set differently from the office. A guest room can remain at a more economical setpoint when unused. A sun-exposed space may require more cooling than the others.

With a four-zone SENVILLE heat pump, each indoor unit has its own control.

Wi-Fi is included according to the AirGreen specifications, while the documentation describes integration with Alexa and the Senville app for scheduling and remote control.

This function becomes truly useful when several rooms need to be managed separately.

An important limitation: the zones share the same general mode

A conventional residential multi-zone system shares the same outdoor unit.

Therefore, one should not expect one bedroom to be in cooling mode while another simultaneously requests heating.

The zones may have different temperatures, but they must operate in a compatible mode.

This reality is important during the shoulder seasons, particularly in spring or fall, when a sunny room may overheat while another remains cool.

Automatic louvers and air distribution in each room

The AirGreen specification sheet indicates:

• automatic vertical;
• automatic horizontal.

This function improves the distribution of the air stream, but the location of each head remains critical.

At AirGreen, we aim in particular to avoid:

• a direct stream of air onto a bed;
• air blowing directly onto a desk;
• a head installed too close to a ceiling;
• a position that blocks the air coverage;
• an installation that makes maintenance more difficult.

In a bedroom, the best position is not always the easiest one for the piping. We therefore need to find a compromise between performance, aesthetics, and route simplicity.

A four-zone installation is won mainly through planning the lines, drains, and outdoor unit.

A precharge of up to 125 feet

The documentation indicates that the SENA-36HF-MOA contains approximately 134.04 oz of R-454B and is precharged for a total length of up to 125 feet.

In a four-zone project, this information is important.

Four heads can quickly generate a significant total piping length.

Suppose:

• 20 feet for the first zone;
• 25 feet for the second;
• 35 feet for the third;
• 30 feet for the fourth.

The total already reaches 110 feet.

That is why we calculate the lengths before installation rather than afterward.

R-454B: a new standard that requires proper installation

The system uses R-454B.

This A2L refrigerant requires appropriate practices during HVAC commissioning and servicing.

A professional installation includes, among other things:

• proper line preparation;
• compliant connections;
• leak tests;
• vacuuming;
• correct charge;
• final operation check.

In a four-zone system, the number of connections is greater than in a single-zone system, making the quality of the refrigeration work even more important.

1/4 in – 1/2 in piping

The AirGreen specification sheet indicates connection sizes of 1/4 in – 1/2 in.

The route must be planned to avoid an accumulation of visible line-hide on the façades.

In an installation in Montréal or Longueuil, we can sometimes group several runs along the same vertical line and then distribute them to the different rooms.

This method often improves the exterior appearance.

Four heads also mean four drains

Each indoor unit produces condensate in cooling mode.

A four-zone system may therefore require up to four separate drainage runs.

It is a detail that quickly becomes critical.

We try to prioritize gravity drains when the configuration allows.

Poor planning may require several condensate pumps, which adds:

• noise;
• mechanical parts;
• maintenance;
• risk of blockages.

In a bedroom, a pump that starts regularly during the night can be much more disruptive than expected.

An outdoor unit weighing more than 200 lb

The brochure specifies for the outdoor unit:

• dimensions: 38.58 × 16.34 × 38.39 in;
• weight: approximately 211.86 lb;
• maximum outdoor airflow: 3,037.2 CFM;
• outdoor sound level: 65 dB(A).

This is therefore not a small outdoor unit.

Its base or support must be suitable for its weight and Québec's winter conditions.

We also check:

• clearances;
• snow accumulation;
• defrost water;
• distance from windows;
• proximity to the neighbor;
• accessibility for servicing.

65 dB(A): location matters

An outdoor sound level of 65 dB(A) deserves particular attention.

On a property with a large lot, the impact may be limited.

In a densely populated Montréal neighborhood or in certain areas of Longueuil, the distance from windows, patios, and neighbors is often much smaller.

We therefore try to avoid installing it directly beneath a bedroom window or too close to a patio used in the evening.

MCA 37 A and MOP 40 A

The brochure specifies:

• MCA: 37 A;
• maximum protection: 40 A;
• power supply: 208/230 V single-phase.

The electrical circuit must be sized according to the nameplate data and applicable requirements.

In a home already heavily loaded by baseboard heaters, a water heater, a stove, and an electric vehicle charging station, we check the available capacity before confirming the work.

Diagnostics and leak detection

The documentation also presents built-in diagnostic and refrigerant leak detection functions.

On a four-zone system, this function is useful because the refrigeration network has more fittings and components.

However, it does not replace a diagnosis by a refrigeration technician.

A drop in performance in a single zone may be related to:

• a sensor;
• a fan motor;
• an electronic problem;
• a refrigerant charge;
• a fitting;
• a drain;
• a communication error.

The 1,800 sq. ft. area shown in the brochure must be interpreted correctly

The brochure indicates that the SENA-36HF/D configuration can cover up to approximately 1,800 sq. ft.

This information should not be interpreted as an automatic rule.

A well-insulated 1,800 sq. ft. newer home may have a very different heating load from an old duplex of the same size.

At AirGreen, we consider in particular:

• insulation;
• number of windows;
• solar orientation;
• ceiling height;
• wall exposure;
• construction type;
• number of floors;
• desired temperature;
• occupancy.

Realistic example of a four-zone project

A common scenario would be a two-story home where the owners want:

1. one unit in the primary bedroom;
2. one unit in a second bedroom;
3. one unit in the office;
4. one unit in the large living-dining area.

In this case, the living room head may require more capacity than those in the bedrooms.

We would therefore not necessarily choose four identical units.

The combination can be adapted to the actual needs of each space, subject to compatibility with the SENA-36HF-MOA.

Provincial rebate shown: $4,560

The AirGreen product sheet currently shows a $4,560 provincial rebate for this combination.

It also states:

• ENERGY STAR certification;
• Cold Climate certification;
• ENERGY STAR number 3630064.

Senville documentation confirms the series’ ENERGY STAR certification and cold-climate positioning.

As always, financial assistance must be verified at the time of the project using the exact combination of indoor and outdoor units.

In a multi-zone system, this detail is particularly important.

Warranty

This system is covered for 10 years on the compressor, 10 years on parts and 6 years on labor, straight from the distributor, with the option of additional coverage.

Four single-zone systems or a four-zone system?

This is a comparison we often make.

Four single-zone systems provide four independent outdoor units.

A multi-zone system uses a single outdoor unit.

Advantages of the four-zone system

• fewer outdoor units;
• better aesthetics;
• less space occupied;
• only one outdoor unit to maintain;
• independent control of the four rooms;
• a particularly interesting solution for façades where space is limited.

Advantages of separate single-zone systems

• each system is completely independent;
• an outdoor-unit failure affects only one zone;
• some small single-zone units can offer excellent individual performance;
• each zone has its own dedicated outdoor capacity.

The best choice depends on the building and the owner's priorities.

The most common mistake: overloading the indoor capacity because the outdoor unit accepts five zones

The fact that the SENA-36HF-MOA can accept up to five zones does not mean that any combination of heads can be installed.

The matching rules must be followed.

For a four-zone system, we therefore verify the total connected capacity and the manufacturer's limits before finalizing the order.

This is particularly important for winter heating, when several rooms may require heat simultaneously.

Why choose AirGreen for a multi-zone installation

A four-zone heat pump requires more coordination than a simple wall-mounted unit.

At AirGreen, we plan:

• the heating needs of each room;
• indoor models;
• total capacity;
• low-temperature capacity;
• piping lengths;
• drains;
• exterior aesthetics;
• outdoor-unit support;
• electrical supply;
• commissioning;
• eligibility for subsidies;
• future access for maintenance.

We carry out these installations in Montreal, Laval, Longueuil, the South Shore, the North Shore, and Montérégie.

Our assessment of the SENVILLE SENA-36HF-MOA

The SENVILLE 36,000 BTU platform offers a particularly interesting combination for a property requiring several independent zones:

• 2 to 5 compatible zones;
• perfectly suited to a 4-zone configuration when properly matched;
• 36,000 BTU nominal cooling capacity;
• 36,000 BTU nominal heating capacity;
• modulation up to 43,000 BTU in cooling;
• modulation up to 44,000 BTU in heating;
• SEER2 23;
• EER2 13;
• HSPF2-4 10.7;
• operation down to -30 °C;
• R-454B;
• ENERGY STAR;
• Cold Climate;
• WiFi;
• refrigerant precharge up to 125 feet;
• maximum protection of 40 A.

For a home divided into several rooms, it allows the zones to be treated directly rather than trying to force air from a single point.

However, the result depends on the quality of the design. A good outdoor unit cannot compensate for improperly sized heads, poorly planned drains, or an incorrect indoor-unit combination.

For a quote on a SENVILLE 4-zone heat pump, contact AirGreen. We can size each room, verify the combination of indoor units, plan the piping, and confirm the financial incentives available before installation in Montreal, Laval, Longueuil, the North Shore, or the South Shore.

Warranty: 10 years on the compressor, 10 years on parts and 6 years on labor, straight from the distributor.