SENVILLE R454B 2-Zone Heat Pump | 48000 BTU

Two 24,000 BTU zones, one outdoor unit: a configuration designed for large spaces that require true independent control

A 48,000 BTU 2-zone heat pump meets a very different need from a single-zone wall-mounted heat pump. Here, a single outdoor unit powers two separate indoor units, making it possible to condition two major zones of a building while retaining a single outdoor refrigeration system.

The SENVILLE configuration associated with this listing uses the SENA-48HF-MOA outdoor unit and, in the 2-zone version documented by Senville, two indoor units of 24,000 BTU each. The brochure specifically identifies the product as the SENA-48HF/D, with the commercial combination SENA-48HF-D2424.

For us at AirGreen Heat Pumps, Air Conditioning & Heating, this type of system becomes particularly relevant when a homeowner in Montreal, Laval, Longueuil, on the South Shore or the North Shore wants to cool and heat two large zones without installing two separate outdoor units.

The AirGreen combination is associated with the following specifications:

• Outdoor unit: SENA-48HF-MOA
• Commercial capacity: 48,000 BTU
• Configuration shown: 2 zones
• Two 24,000 BTU indoor units
• AHRI: 215735320
• ENERGY STAR®: yes
• ENERGY STAR® Cold Climate: yes
• ENERGY STAR ID: 3630067
• Refrigerant: R-454B
• SEER2: 23
• EER2: 12
• HSPF2-4: 11
• WiFi: included
• Minimum heating temperature: -30 °C
• Power supply: 208/230 V
• MCA: 37 A
• MOP: 40 A
• Outdoor sound level: 65 dB(A)

Senville documentation confirms the SEER2 of 23, the use of R-454B, 208/230 V power supply, and a multi-zone design capable of managing 2 to 6 zones depending on the configuration.

One essential clarification: the outdoor unit can support several configurations, but this article focuses on two zones.

The brochure states that the SENA-48HF-MOA can support 2 to 6 zones.

This does not mean that the configuration presented here includes six indoor units. The version documented on the first page does include two 24,000 BTU units each, for a 24,000 + 24,000 BTU combination.

For a homeowner, this distinction is important.

A multi-zone outdoor unit is a platform capable of supporting different combinations. However, the final performance depends on:

• of the number of installed heads;
• of their individual capacity;
• of the line-set length;
• of the zones’ simultaneous needs;
• of the certified combination.

It is therefore essential to always compare the complete combination, not just the outdoor unit number.

Two 24,000 BTU heads: for what type of building is this configuration suitable?

Two 24,000 BTU wall-mounted units represent substantial capacity.

This combination may be interesting, for example, for:

• two relatively open large floors;
• a large ground floor and basement;
• two large commercial zones;
• two independent residences or sections when the technical configuration allows it;
• a large residential space divided into two thermal zones.

Senville generally recommends this 48,000 BTU version for approximately 2,000 to 2,500 sq. ft., while presenting it as a solution for multiple zones or large spaces.

We consider this area only a general indication.

A 2,200 sq. ft. property in Boucherville with recent insulation and an open layout may have a completely different load from an older duplex in Montreal of a similar size.

For a multi-zone HVAC installation, we must consider, among other factors:

• insulation;
• windows;
• solar exposure;
• ceilings;
• exterior walls;
• natural air circulation;
• the actual separation between the zones;
• winter heating needs.

A common mistake is to simply add 24,000 + 24,000 and assume that each head will always have 24,000 BTU

A multi-zone system operates differently from two independent heat pumps.

The two indoor units share the same outdoor unit and compressor. When both zones require substantial capacity simultaneously, the outdoor unit must distribute its output.

The brochure lists a nominal cooling capacity of 47,000 BTU/h for the system, with an operating range of 12,000 to 57,000 BTU/h. In heating mode, the nominal capacity is 49,000 BTU/h, with modulation from 13,000 to 57,000 BTU/h.

That is precisely why we do not present a multi-zone system as two completely independent single units from a refrigeration standpoint.

The temperatures can be adjusted separately in the two spaces, but the units share the available outdoor capacity.

SEER2 23: outstanding efficiency for a system of this capacity

The SEER2 of 23 is particularly noteworthy for a 48,000 BTU multi-zone system.

The brochure also confirms:

• EER2: 12
• HSPF2-4: 11
• HSPF2-5: 9
• Nominal COP: 3.7.

For a property that frequently uses both zones during the summer, seasonal efficiency becomes important because a high-capacity system can accumulate many operating hours.

The inverter also allows modulation. It is therefore not a unit doomed to constantly produce 48,000 BTU.

The cooling range, which can go down to 12,000 BTU/h, allows the system to adjust its output when only one zone requires little energy or when overall needs decrease.

Why modulation is even more important in a 2-zone heat pump

Let’s consider a simple configuration.

The first head serves a large living room-kitchen where several people are present. The second serves a floor that has become almost unused for a few hours.

The needs are not identical.

The inverter compressor adjusts its output to meet the overall load rather than operating solely in on-off mode.

In a properly sized installation, this can improve:

• temperature stability;
• partial-load consumption;
• the comfort of both zones;
• the acoustic performance of the indoor units;
• the efficiency during periods when a single zone demands a lot of energy.

Heating down to -30 °C: low-temperature capacities must be considered separately

The AirGreen specifications provide three particularly useful operating points:

• 45,000 BTU/h at -8 °C
• 47,000 BTU/h at -15 °C
• Maximum 24,600 BTU/h at -30 °C

The stated COP is approximately 2.6 at -8 °C and 1.27 at the maximum operating point at -30 °C.

Senville’s documentation confirms a minimum heating temperature of -22 °F, or -30 °C.

The technical conclusion is important: operating down to -30 °C does not mean maintaining 48,000 BTU of heating capacity down to -30 °C.

At this extreme temperature, the AirGreen specifications indicate a maximum capacity of approximately 24,600 BTU/h.

For a large home in Greater Montreal, this difference must be incorporated into the heating calculation.

At -15 °C, the capacity remains very high

The 47,000 BTU at -15 °C listed on the AirGreen specifications sheet is particularly interesting.

At this temperature, the available capacity remains close to the system’s overall rated capacity.

This is precisely the type of data we examine at AirGreen when a customer wants to use their heat pump as the primary heating source for a large portion of the winter.

The relevant question is not merely: “Down to what temperature does it operate?”

We look instead at:

How many BTUs does the system produce at the temperature when the house actually needs them?

Cold Climate and ENERGY STAR®

The AirGreen specifications indicate:

Cold Climate: yes

ENERGY STAR®: yes

and the brochure also presents the series as ENERGY STAR certified and designed to provide heating down to -30 °C.

For a Quebec homeowner, this certification may be relevant both to the technical choice and to certain financial assistance programs.

The AirGreen listing associates this combination with reference AHRI 215735320 and identifier ENERGY STAR 3630067.

Advertised provincial rebate: $5,400

The AirGreen listing currently indicates a $5,400 provincial rebate.

For a multi-zone project, an amount of this magnitude can obviously significantly change the installation’s net cost.

Eligibility must nevertheless be confirmed when the quote is prepared, as programs, amounts, and criteria may be revised.

We specifically verify:

• the exact models;
• AHRI;
• Cold Climate certification;
• the type of building;
• the rules in effect at the time of the project.

A system commercially called “Senville 48,000 BTU” is not sufficient to validate a rebate. The specific certified combination is decisive.

Two-zone installation: what we check before recommending the SENVILLE SENA-48HF-MOA

A substantial outdoor unit weighing nearly 250 lb

The brochure lists the following dimensions for the outdoor unit:

37.48 in × 16.34 in × 52.48 in

weighing approximately 246.47 lb.

We are therefore not talking about a small conventional wall-mounted unit.

Its installation requires:

• a suitable support;
• an accessible location;
• adequate clearances;
• special attention to snow accumulation;
• a well-planned refrigerant line route.

At several Montreal properties, outdoor space may be limited. On the South Shore or North Shore, we may sometimes have more flexibility, but the unit must always remain accessible for servicing.

4,503 CFM outdoors: do not enclose the condenser

The documentation indicates a maximum outdoor airflow of 4,502.8 CFM and a sound level of 65 dB(A).

A unit capable of moving more than 4,500 cubic feet of air per minute should not be enclosed behind overly tight decorative panels or placed in a corner where discharged air immediately returns toward the coil.

Poor airflow around the outdoor unit can affect its heat exchange and operation.

An outdoor sound level of 65 dB(A) warrants careful consideration of the location

The stated value is 65 dB(A).

For a large multi-zone unit, the following must therefore be taken into account:

• from the primary bedroom;
• from the windows;
• from the terrace;
• neighbors;
• walls that may reflect sound;
• municipal regulations.

A very short piping run is not necessarily the best installation if it positions the condenser directly beneath a bedroom window.

R-454B: 151.68 oz charge and impressive 150-foot precharge

Senville documentation indicates a charge of 151.68 oz of R-454B as well as a specified precharge for up to 150 feet.

Senville also specifies that the system is precharged for a total of up to 150 feet of piping and that professional installation is required.

This capacity is particularly interesting in a multi-zone project because the two indoor units may be far from the outdoor unit.

However, this does not mean that we should unnecessarily use all of that length.

The more complex the route, the more we need to consider:

• pressure losses;
• the total amount of copper;
• height differences;
• passages through the walls;
• future access;
• the aesthetics of the line-hide covers.

3/8 in – 5/8 in piping: pay attention to the exact branch configuration

The AirGreen specifications indicate a main pipe size of 3/8 in – 5/8 in.

However, on a multi-zone system, we must always consult the exact combination diagram to determine the applicable diameters for each indoor unit and any distribution fittings.

We avoid treating the diameter shown on the outdoor unit’s specifications as complete installation instructions for both branches.

Installing two indoor units: drainage can become more complex than the refrigerant piping

A 2-zone heat pump also means two indoor units producing condensate in cooling mode.

Each one requires adequate drainage.

In one project, we may sometimes route both drains by gravity. In other configurations, one indoor unit is located where the natural slope is insufficient, and an additional solution must be planned.

At AirGreen, we therefore evaluate for each zone:

• the available wall;
• the refrigerant line route;
• the drain;
• electrical access;
• the direction of airflow;
• future maintenance.

Automatic vertical and horizontal louvers

The AirGreen specifications indicate automatic vertical and horizontal louvers.

On a 24,000 BTU indoor unit, this feature is useful for distributing air throughout a large area.

But it cannot correct poor placement.

Ideally, we aim to orient each unit toward the depth of its space, without blowing directly onto a table, sofa, or bed.

In a multi-zone system, each indoor unit must be considered a complete installation in its own right.

WiFi included: particularly relevant for two zones

WiFi is included according to the AirGreen product sheet, and the brochure confirms smart app-based control.

In a 2-zone installation, this feature becomes genuinely practical.

For example, an owner can keep a main zone at a comfortable temperature while lowering the setpoint in a space used less often.

The brochure indicates that the package includes, among other things:

• 2 indoor units of 24,000 BTU
• one outdoor unit;
• the wireless remote controls;
• a USB WiFi kit;
• two 16-foot installation kits;
• the connection harnesses;
• the installation manual.

Electrical requirements: MCA 37 A and MOP 40 A

The documentation specifies:

MCA: 37 A

maximum protection: 40 A.

The power supply is 208/230 V single-phase, 60 Hz, with a voltage range of 187 to 253 V.

Before installation, we must therefore confirm:

• the electrical panel;
• the available capacity;
• the circuit breaker;
• the conductor size;
• the outdoor disconnect switch.

For a 48,000 BTU heat pump, this verification must be completed before finalizing the project, not on the day of installation.

A practical example: two large floors with different usage patterns

Let’s take an example configuration, solely to illustrate how the system works.

A property has a large open-plan ground floor and a finished basement of a similar size.

The ground floor is occupied all day, while the basement is mainly used in the evening.

With a single heat pump and one indoor head, distributing air evenly between the two levels would be difficult.

With two independent indoor units:

• each floor receives its own air distribution;
• the settings can be adjusted separately;
• the unused zone can operate at a lower intensity;
• the outdoor unit remains single.

This is precisely the type of situation in which the 2-zone approach becomes attractive.

Another scenario in which two outdoor units might be preferable

A multi-zone system is not automatically the best solution.

If the two spaces are very far apart or the owner wants complete redundancy, two independent heat pumps may sometimes be preferable.

With two separate units, a failure of one outdoor unit does not disable both zones.

A multi-zone system instead offers:

• a single outdoor unit;
• a simpler outdoor appearance;
• a centralized system power supply;
• multiple indoor zones.

The choice therefore depends on the building and the owner’s priorities.

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.

Self-diagnostics and leak detection

The documentation mentions built-in diagnostics and leak detection functions designed to facilitate the identification of certain problems.

On a multi-zone system, this feature is useful, but it obviously does not replace HVAC maintenance.

Two indoor units also mean:

• two filter assemblies;
• two evaporators;
• two drains;
• two zones to inspect.

The owner must therefore plan maintenance suited to the complete configuration.

Why choose AirGreen for a 48,000 BTU SENVILLE 2-zone heat pump

A multi-zone installation of this capacity must be planned as a complete system, not as “two heads connected to one machine.”

At AirGreen, we specifically check:

1. the heat load of each zone;
2. the proper capacity of each indoor unit;
3. the compatibility of the combination with the outdoor unit;
4. the routing of each refrigerant line;
5. total lengths;
6. height differences;
7. drainage for each unit;
8. the 208/230 V power supply;
9. the outdoor location;
10. clearances and noise;
11. eligibility for available programs;
12. future access for maintenance.

We serve Montreal, Laval, Longueuil, the South Shore, the North Shore, and Montérégie for single-zone and multi-zone heat pump projects.

The SENVILLE SENA-48HF-MOA R454B offers a particularly interesting technical package: 23 SEER2, Cold Climate operation down to -30 °C, modulation from 12,000 to 57,000 BTU in cooling, up to 57,000 BTU in heating, WiFi, ENERGY STAR, and the ability to manage multiple zones with a single outdoor unit.

For the configuration presented here, the main advantage is clear: two large 24,000 BTU zones each, with a single 48,000 BTU outdoor unit.

Contact AirGreen to get a quote for the SENVILLE R454B 48,000 BTU 2-zone heat pump, check whether the 24,000 + 24,000 BTU combination is suitable for your building, and schedule a complete HVAC installation in Montreal, Laval, Longueuil, the South Shore, or the North Shore.

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