SENVILLE R454B 5-Zone Heat Pump | 36000 BTU

A single outdoor unit for five distinct areas: a multi-zone solution that requires proper sizing work

A 36,000-BTU five-zone heat pump should not be approached as five small independent heat pumps grouped around the same compressor. With the SENVILLE SENA-36HF-MOA, the five indoor units share the outdoor unit’s available capacity, while each zone retains its own temperature control and airflow.

This architecture is particularly interesting in homes in Montreal, Laval, Longueuil, the North Shore, and the South Shore where needs are distributed among several enclosed rooms: bedrooms, an office, a basement, an open-concept area, an upper floor, or an addition. In this type of building, increasing the capacity of a single wall-mounted unit does not necessarily solve the problem. Instead, heating and cooling should be brought directly to the areas that need them.

The technical documentation for the SENA-36HF-MOA confirms that this multi-zone platform can serve 2 to 5 zones. It operates on a 208/230 V single-phase power supply, offers a SEER2 of 23, an EER2 of 13, a nominal capacity of 36,000 BTU, and a much wider modulation range than this nominal value.

For the configuration published by AirGreen, the main specifications are:

• Outdoor unit: SENA-36HF-MOA
• Cooling capacity: 36,000 BTU
• AHRI: 215735317
• ENERGY STAR: yes
• ENERGY STAR cold climate: yes
• ENERGY STAR number: 3630064
• Refrigerant: R-454B
• SEER2: 23.0
• EER2: 13.0
• HSPF2: 10.7
• Heating down to: -30°C
• Capacity at -8°C: 38,000 BTU/h
• Capacity at -15°C: 36,000 BTU/h
• Maximum capacity at -30°C: 22,400 BTU/h
• COP at -8°C: 2.12
• Maximum COP at -30°C: 1.47
• MCA: 37 A
• MOP: 40 A
• Maximum outdoor airflow: approximately 3,038 CFM
• Outdoor sound level: 65 dB(A)
• WiFi: included
• Provincial subsidy displayed by AirGreen: $4,560

What “five zones” really means

The outdoor unit does not have five compressors. It has a single capacity source that is distributed among the indoor units according to demand.

This is an essential point.

If five indoor units are installed in five rooms, they do not automatically receive 7,200 BTU each simply because 36,000 divided by five equals 7,200.

The system’s logic is dynamic.

A room that has already reached its setpoint may require very little energy, while an open-concept ground-floor area may require much more capacity. The inverter compressor then adjusts its operating speed within the limits set by the installed combination.

Senville's technical data sheet indicates a cooling range of 9,000 to 43,000 BTU/h and a heating range of 10,000 to 44,000 BTU/h. It also indicates electrical modulation ranging approximately from 600 to 4,000 W in cooling mode and from 600 to 3,750 W in heating mode.

This modulation is what allows a multi-zone system to respond to several varying demands without continuously running the compressor at maximum capacity.

The attached brochure shows a two-zone configuration, but the outdoor unit supports up to five zones

The first page of the provided document presents a commercial combination consisting of two 18,000 BTU indoor units, under reference SENA-36HF-D1818.

This should not be taken to mean that the SENA-36HF-MOA is limited to two indoor units.

The technical table in the same document clearly states:

Number of Zones: 2–5.

This is the outdoor platform of interest here for the 5-zone AirGreen configuration.

However, the brochure does not provide, in the attached pages, the complete list of permitted combinations of five indoor units. We therefore cannot automatically deduce their individual capacities from this document. In an actual project, we verify the exact combination before selecting the five indoor units.

Why five small indoor units can provide better comfort than one large unit

Let us consider a typical two-story house with a basement.

It includes:

• a large living room and kitchen;
• a primary bedroom;
• two other bedrooms;
• a basement office.

Even if a single 24,000 or 36,000 BTU heat pump has sufficient theoretical capacity for the total area, it cannot efficiently deliver air through multiple doors, corridors, stairwells, and walls.

A 5-zone heat pump addresses the problem differently.

Each area receives its own indoor unit.

In this scenario, a design could assign one indoor unit to the open area, then use units suited to the bedrooms and basement. We do not automatically assign the same capacity to every room: each zone is sized according to its own thermal losses and gains.

A bedroom should not be oversized simply because the outdoor unit is large

This is a mistake we particularly strive to avoid.

If a small bedroom has a low heating and cooling load, installing an unnecessarily large indoor unit can produce shorter cycles and less stable comfort.

The fact that the outdoor unit is capable of 36,000 BTU does not justify installing large indoor units everywhere.

We look at, in particular:

• area of each zone;
• number of exterior walls;
• number of windows;
• sun exposure;
• insulation level;
• ceiling height;
• the presence of heat-generating equipment;
• the frequency with which the room is used.

This is particularly important when we work on homes in Montreal with several small bedrooms or plexes where each room has a different layout.

Five independent thermostats, but one shared operating mode

Each indoor unit can have its own setpoint.

A homeowner could therefore maintain:

• 21 °C in the living room;
• 19 °C in a bedroom;
• 20 °C in another;
• 18 °C in a rarely used office;
• 20.5 °C in the basement.

However, there is an important limitation to understand before purchasing a multi-zone heat pump.

Indoor units connected to the same outdoor unit should normally operate in compatible modes. One room cannot continuously call for cooling while another requires heating at the same time on a conventional reversible system.

In most Quebec residences, this limit poses few problems in the middle of winter or at the height of summer, but it can become relevant during the shoulder seasons if certain rooms have significantly different solar loads.

36,000 nominal BTU/h, but up to 44,000 BTU/h under certain conditions

Senville documentation indicates a nominal heating capacity of 36,000 BTU/h, but a range that can reach 44,000 BTU/h.

This margin is useful during periods of high simultaneous demand.

Conversely, the system can significantly reduce its output when only one or two zones actually require heat.

This is particularly useful in the spring and fall in Greater Montreal, when heating needs change rapidly between day and night.

Heating down to -30 °C: a very interesting feature, but one that must be interpreted correctly

Senville indicates a minimum outdoor heating temperature of -22 °F / -30 °C.

The AirGreen data sheet also specifies the following capacities:

These figures show why the statement “heats down to -30 °C” is never enough to size a heat pump.

At -15 °C, the listed capacity remains equivalent to the nominal 36,000 BTU.

At -30 °C, it drops to approximately 22,400 BTU/h.

If the house loses 32,000 BTU/h when the outdoor temperature reaches -30 °C, the heat pump can continue to make a significant contribution to heating, but supplemental heating will be needed to make up the difference.

COP 2.12 at -8 °C and COP 1.47 at -30 °C

The COP helps provide a better understanding of what happens with energy consumption.

A COP of 2.12 indicates that under the corresponding conditions, the system provides approximately 2.12 units of heat for every unit of electricity consumed.

At -30°C, the published maximum COP drops to 1.47.

The heat pump therefore still has an advantage over electric resistance heating under these conditions, but that advantage is significantly smaller than when the outdoor temperature is less extreme.

This detail is important for homeowners in Laval, Longueuil, Terrebonne, Boucherville, Blainville, or Montreal who want to estimate heating savings. Annual savings must be assessed over an entire season, not only on the coldest days.

ENERGY STAR cold climate and listed rebate of $4,560

The AirGreen data sheet identifies this combination as ENERGY STAR cold climate with the number 3630064.

It also indicates a provincial rebate of 4 560 $.

Since the capacity at -8°C published on the data sheet is 38,000 BTU/h, this value becomes particularly important when calculating certain financial incentives based on low-temperature performance.

For a five-zone system, however, the certified combination actually installed must be verified. The same outdoor unit may accept several indoor-unit assemblies, and we never assume that all combinations automatically produce the same certification.

The role of AHRI number 215735317

The AirGreen data sheet associates this configuration with AHRI number 215735317.

This is more precise than the general description “Senville 36,000 BTU.”

For a project involving five indoor units, we always want to match:

• the outdoor unit;
• the five indoor units;
• the AHRI combination;
• low-temperature performance;
• eligibility for the rebate.

This is a particularly important precaution with a multi-zone system, because a single outdoor unit may serve several different configurations.

Installing five zones correctly: where HVAC expertise becomes decisive

The first challenge is deciding where the five zones begin and end.

Five rooms do not necessarily correspond to five ideal zones.

In an open-concept home, the kitchen, dining room, and living room may behave as one large thermal zone.

Conversely, two bedrooms of the same size can have very different loads if one faces due south and the other due north.

At AirGreen, we therefore aim to distribute the units according to the property's actual thermal behavior.

A representative configuration could be:

Zone 1: main living area

Higher-capacity unit for the living room, kitchen, and dining room.

Zone 2: primary bedroom

Independent control to maintain a different temperature at night.

Zone 3: second bedroom

Unit sized for a lower load.

Zone 4: office or third bedroom

Independent control, particularly useful when this room is not used every day.

Zone 5: basement

A zone that is often cooler in summer and has heating requirements that differ significantly from those of the upper floor.

This distribution is not a universal prescription. It mainly illustrates why a 5-zone installation requires more design work than a simple wall-mounted heat pump.

125 feet of precharge: an important figure when connecting five indoor units

The system uses R-454B.

The technical specifications indicate a charge of 134.04 oz of R-454B and a stated precharge for 125 ft.

This length becomes particularly relevant in a five-zone installation.

Suppose the routes are approximately:

• 15 ft;
• 20 ft;
• 25 ft;
• 30 ft;
• 35 ft.

The total already reaches 125 ft.

With five units, we must therefore plan the routes before choosing the outdoor unit's final location.

A compressor positioned solely because it is not visible from the street may sometimes require adding dozens of feet of unnecessary piping.

The 1/4 – 1/2 in piping specification should not be applied blindly to all five zones

The AirGreen specifications indicate 1/4 in – 1/2 in piping.

In a multi-zone installation, pipe sizes may depend on the capacity and exact model of each indoor unit.

We therefore do not assume that all five indoor units necessarily use the same diameters.

Each connection must be checked before preparing the job site.

The drains become five separate projects

This is an aspect that is often underestimated.

A five-zone heat pump means up to five units that can produce condensate in cooling mode.

Each indoor unit must have:

• a properly sized drain;
• an adequate slope when drainage relies on gravity;
• an accessible route;
• backflow protection;
• a suitable strategy when gravity drainage is not possible.

In some installations in Montreal and Longueuil, drainage issues are more significant than refrigerant piping issues, particularly when several units must be installed on interior walls.

A condensate pump may sometimes be necessary, but we generally favor gravity drainage when the configuration allows it.

The outdoor unit is substantial: 211.86 lb

The SENA-36HF-MOA measures approximately:

38.58 in × 16.34 in × 38.39 in

and its stated net weight is 211.86 lb.

We are well beyond the weight of a small single-zone unit.

The support must be selected accordingly.

In Quebec, you must also take into account:

• snow accumulation;
• ice created by defrosting;
• vibrations;
• wall or ground stability;
• access for servicing;
• the required clearances around the outdoor unit.

Why we avoid installing it too close to the ground

A heat pump capable of operating down to -30 °C must physically be able to breathe when it snows.

If the outdoor unit is blocked by 30 or 40 cm of snow, the low-temperature certification does nothing to solve the problem.

We therefore plan for an elevation suited to the site.

During defrosting, the outdoor unit also produces water. This water can freeze beneath the unit and gradually form a significant buildup of ice.

The space beneath the unit must be planned with this reality in mind.

3,037 CFM: the outdoor unit moves a lot of air

The technical table indicates a maximum outdoor airflow of 3,037.2 CFM.

This figure explains why we leave sufficient space around the unit.

An outdoor unit enclosed between several walls or installed beneath an overly restrictive structure may reabsorb air that has already been discharged.

A 36,000 BTU multizone heat pump needs a location that allows genuine airflow, not merely enough space to physically fit the unit.

65 dB(A): the choice of exterior wall deserves attention

The indicated outdoor sound level is 65 dB(A).

On a detached property with plenty of land, this often offers several placement options.

In a duplex in Montréal or a home close to its neighbors in Laval or Longueuil, we need to pay greater attention to windows, terraces, and surfaces that reflect sound.

Placing the outdoor unit in a narrow corridor between two buildings can result in a very different perception of sound from that experienced in an open area.

MCA 37 A and MOP 40 A

The unit operates at 208/230 V, single-phase, 60 Hz.

The documentation states:

MCA: 37 A
MOP: 40 A

These values are used to design the unit's electrical circuit.

A circuit breaker should not be selected by making an approximate calculation based on the 36,000 BTU rating. The electrical specifications on the nameplate and in the model documentation are the references to follow.

WiFi makes perfect sense with five zones

Remote control may seem secondary on a single-zone heat pump. With five indoor units, it becomes much more practical.

The documentation highlights smart app control and Alexa integration.

A family can adjust different rooms without walking throughout the house with five remote controls.

This also makes it possible to program a rarely used bedroom differently from the living room or office.

However, WiFi should not be considered a substitute for properly selecting capacities. An improperly sized head will remain improperly sized even with an excellent app.

Leak detection and self-diagnostics

Senville also indicates monitoring and problem-detection functions, including certain refrigerant-related anomalies.

On a five-zone system, this feature can facilitate the initial diagnostic step.

But when only one zone is no longer heating properly, several causes are possible:

• clogged filter;
• dirty heat exchanger;
• drain problem;
• indoor fan;
• communication;
• sensor;
• refrigerant charge;
• configuration problem.

The system must therefore be diagnosed as a whole rather than automatically replacing a part on the unit that appears to be causing the problem.

Five zones also mean five units to maintain

The added comfort comes with more maintenance points.

A 5-zone configuration includes:

• five filters or filter assemblies;
• five indoor heat exchangers;
• five fans;
• five drains;
• five louver assemblies;
• several additional refrigerant connections.

A bedroom unit may remain relatively clean while a head located in an open kitchen accumulates dust and contaminants much more quickly.

We therefore recommend HVAC maintenance tailored to each zone rather than an approach in which all units are automatically cleaned at the same interval.

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.

When is a SENVILLE 5-zone 36,000 BTU particularly relevant?

We mainly consider this configuration when the property has several separate rooms and the owner wants to avoid installing multiple outdoor units.

It may be particularly suitable for:

• a large house with enclosed bedrooms;
• a two-story property with a basement;
• five areas requiring different settings;
• a multi-unit property where several spaces need to be conditioned;
• a house where the exterior aesthetics limit the number of units;
• a project seeking a cold-climate ENERGY STAR heat pump;
• a property where operation down to -30 °C is required.

Conversely, it would be unnecessarily complex for a large open-concept area where one or two properly sized units are sufficient.

The main pitfall: wanting to use all five ports simply because they are available

The fact that the outdoor unit supports up to five zones does not mean that five units are always the best solution.

We do not recommend adding a head unit to a room that does not genuinely need one simply to “use all the ports.”

Each additional unit adds:

• piping;
• a drain;
• wiring;
• maintenance;
• connections;
• a potential load on the system.

A good 5-zone installation is therefore one where all five zones are genuinely justified.

Why AirGreen Pays So Much Attention to Design Before Installation

With five zones, a poor choice made at the beginning of the project is repeated several times.

A poorly positioned outdoor unit can lengthen five line-set runs. Poor head-unit selection can affect five spaces. A poor drainage plan can create several points of risk.

At AirGreen Heat Pumps, Air Conditioning & Heating, we therefore verify the overall configuration before starting the work.

We analyze, among other things, the loads in the different zones, the unit locations, piping routes, electrical capacity, drainage, the outdoor unit’s position, and the certified combination.

This preparation is what allows a multi-zone heat pump to operate as a coherent system rather than as five appliances simply connected to the same compressor.

A particularly comprehensive solution for a home divided into several areas

The SENVILLE SENA-36HF-MOA R454B 36,000 BTU offers a highly relevant technical profile for a five-zone configuration: SEER2 23, EER2 13, HSPF2 10.7, heating down to -30°C, modulation up to 44,000 BTU/h in heating mode, ENERGY STAR Cold Climate, and WiFi.

But with an installation this complex, the quality of the result depends more on the design than on the number of features listed on the specification sheet.

A good installation must intelligently distribute capacity among the five areas, keep line-set runs reasonable, ensure drainage for each unit, and maintain the required clearances around the outdoor unit.

For a property in Montreal, Laval, Longueuil, the North Shore, the South Shore, or Montérégie, this configuration can offer a very appealing level of control while limiting the exterior façade to a single outdoor unit.

Contact AirGreen for a quote on your SENVILLE 5-zone, 36,000 BTU heat pump. Before installation, we can verify the required capacity in each of the five zones, the AHRI combination, the locations, the electrical circuit, the refrigerant lines, and the applicable rebate.

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