Installation of a Hitachi airHome 600 wall-mounted heat pump in Terrebonne, on Montreal’s North Shore

An outdoor installation designed for winter, masonry, and system durability

This installation of a Hitachi airHome 600 wall-mounted heat pump in Terrebonne shows how much the quality of an HVAC project depends on details that may seem secondary: the height of the outdoor unit, the stability of the brackets, the routing of the lines, vibration protection, and the clearance left in front of the heat exchanger.

At this brick residence on the North Shore, we installed the outdoor unit on metal wall brackets, above ground and foundation level. This configuration keeps the heat pump away from accumulating snow, runoff, leaves, and debris that could otherwise restrict airflow or hinder winter defrosting.

The photo also shows a carefully aligned white vertical line-set cover on the façade. It protects the refrigerant lines, communication cable, and other connections required between the indoor and outdoor units. Despite the particularities of this masonry, including an old repaired area near the window, the route remains straight, discreet, and securely fastened.

Installing a heat pump on a brick wall requires more than simply drilling

Brick imposes several technical constraints. Before installing the brackets, we must determine where the anchors can be installed without weakening the masonry or unnecessarily transmitting vibrations into the building.

For a project like this in Terrebonne, the main elements to check include:

• the actual condition of the bricks and mortar joints;
• the strength of the structure behind the siding;
• the proximity of the window;
• the presence of a wall vent;
• the possible routing of the lines;
• access to the electrical supply;
• the clearance required around the heat pump;
• the space required for future HVAC maintenance.

A mounting installed solely in aging mortar can become unstable over time. Poor anchor selection can also cause vibration, noise, or gradual movement of the support. We therefore adapt the mounting hardware to the wall type, the weight of the unit, and the building’s specific conditions.

Wall-mounted supports to keep the unit clear of snow

In Terrebonne, an outdoor heat pump installed too close to the ground can quickly become surrounded by snow during the winter. A snowdrift, snow pushed against the building, or accumulation from several storms can obstruct the air intake or outlet.

In this installation, the compressor was placed on a pair of sturdy metal supports. This elevated position helps to:

1. keep the coil above typical accumulations;
2. facilitate water drainage during defrost cycles;
3. reduce contact with splashes and debris;
4. provide reasonable access beneath the unit;
5. simplify certain inspection and maintenance operations.

The elevation should not, however, be chosen at random. A unit installed unnecessarily high becomes more difficult to service. It may also transmit more vibrations if the supports and anchors are not properly suited.

Here, the height protects the equipment while keeping it accessible from the ground.

Visible anti-vibration pads under the unit

Under the feet of the heat pump, we can see pads installed between the unit and the support rails. These components help reduce the mechanical transmission of vibrations to the brick wall.

This precaution is especially important when the outdoor unit is located near a bedroom, living room, or another occupied space. Even when an Inverter compressor operates quietly, a rigid attachment directly to metal can amplify certain frequencies.

To limit structural noise, we pay attention to several aspects:

• the leveling of the supports;
• the even tightening of the bolts;
• the condition of the anti-vibration pads;
• the absence of direct contact between the pipes and the masonry;
• the fastening of the line-hide cover;
• the radius of the bends in the piping;
• the position of the cable and drain.

A pipe that touches the wall directly can transmit a humming sound, even if the unit is operating normally. That is why the entire installation must be evaluated as a whole.

A front clearance that promotes heat exchange

The front of the outdoor unit remains completely unobstructed. No balcony, nearby wall, fence, or bulky object blocks the fan.

This detail is essential because the heat pump must move a significant volume of air through its outdoor coil. In heating mode, it absorbs the heat present in the outdoor air. In cooling mode, it releases outdoors the heat removed from the house.

An obstruction in front of the fan can cause:

• reduced efficiency;
• increased electricity consumption;
• noisier operation;
• more frequent defrost cycles;
• a reduction in heating capacity;
• premature wear of certain components.

The selected position also helps direct the airflow away from the window on the left. Exhaust air must not be directed toward an opening, a frequently used passage, or an obstacle that would immediately redirect it toward the heat exchanger.

A protected vertical route using a line cover

The white line cover extends from the level of the outdoor unit to the penetration corresponding to the location of the indoor unit. Its light color blends with the brick and the other pale elements of the façade.

The following are generally found inside this protection:

• the refrigerant liquid line;
• the refrigerant gas line;
• the thermal insulation;
• the communication cable;
• the appropriate power supply according to the configuration;
• the drain hose when its routing permits.

The line cover is not merely decorative. It protects the insulation from ultraviolet rays, the weather, birds, and accidental damage. Without adequate protection, the insulation can deteriorate, absorb moisture, and gradually lose its effectiveness.

In this project, the routing is kept near the area already marked by previous work in the masonry. This approach avoids adding multiple visual elements to the façade and makes it possible to concentrate the connections along a coherent path.

A connection loop designed without crushing the lines

Near the outdoor unit, the lines exit the bottom of the line cover before connecting to the heat pump fittings. A certain amount of service length is left to prevent an overly tight bend.

Copper lines must never be bent sharply. A kink can restrict refrigerant flow and compromise system performance. The bend radius must comply with the pipe diameter and the manufacturer's requirements.

For the airHome 600 range, the diameters vary according to capacity. The liquid line is 1/4 in, while the gas line may be 3/8 in, 1/2 in, or 5/8 in, depending on the installed model. The maximum permitted length can range from 82 to 98 feet, depending on the selected combination. These parameters must be verified before installation, not after the lines have been run.

Accessible and safe electrical power

An electrical device is visible near the unit, on the right side. A wall-mounted heat pump must be powered by an appropriate circuit protected according to the model’s precise electrical specifications.

The Hitachi airHome 600 series operates at a nominal voltage of 208-230 V, single-phase, 60 Hz. Depending on the capacity, the circuit’s minimum ampacity ranges from 12 to 20 A, while the maximum overcurrent protection may be 15 or 25 A.

It is important not to choose the circuit breaker solely based on another heat pump with similar power. Two units with comparable nominal capacities may require different electrical protection.

Before startup, we check in particular:

• available voltage;
• conductor gauge;
• grounding;
• circuit breaker rating;
• compliance of the disconnect switch;
• tightness of the connections;
• communication between the units;
• the absence of damage to the outdoor wiring.

The Hitachi airHome 600: a heat pump adapted to the residential needs of Terrebonne

An Inverter range available in several capacities

The Hitachi airHome 600 is an Inverter wall-mounted heat pump designed to provide cooling, heating, and indoor air treatment. The series includes systems with different capacities to meet the needs of buildings and spaces of various sizes.

The models presented in Hitachi documentation cover nominal cooling capacities of:

• 9,000 BTU/h;
• 12,000 BTU/h;
• 15,000 BTU/h;
• 18,000 BTU/h;
• 22,000 BTU/h for the model commonly associated with the 24,000 BTU category.

The exact capacity of the unit installed in Terrebonne cannot be confirmed solely from its exterior appearance. It must be verified on the nameplate or in the installation’s technical file.

This distinction is important. We always prefer to present a verified capacity rather than estimate it based on the compressor’s visual dimensions.

Modulation that promotes a more stable temperature

Inverter technology allows the compressor to modulate its speed. When the residence requires a lot of heating or cooling, the system increases its capacity. As the temperature approaches the setpoint, it reduces its speed rather than stopping immediately.

This modulation helps to:

• reduce temperature fluctuations;
• reduce frequent starts;
• improve comfort;
• control humidity more gradually;
• adapt consumption to actual needs;
• reduce certain sound variations.

In Terrebonne, where conditions can shift from high summer humidity to very low winter temperatures, this flexibility is particularly useful.

Continuous heating down to -25 °C

The airHome 600 series is designed to operate in heating mode down to an outdoor temperature of -25 °C. Hitachi also indicates a capacity of up to 100% at -15 °C, depending on the combination and test conditions.

The capacities available at low temperatures vary considerably from one model to another. At -25 °C, the maximum capacity indicated in the documentation ranges from 7,200 to 15,000 BTU/h depending on the unit’s size.

This demonstrates why the nominal cooling capacity alone is not enough to select a heat pump intended for winter heating. We must analyze the actual capacity at -8 °C, -15 °C, -20 °C, and -25 °C, then compare it with the home’s heat loss.

The manufacturer’s documentation also presents:

• performance of up to 23.0 TRÉS2;
• heating performance of up to 9.2 CPSC2 in Region 5;
• ENERGY STAR certification for the listed combinations;
• an outdoor cooling range from -18 °C to 46 °C;
• refrigerant usage R32.

A heater in the condensate pan

Each outdoor unit in the range presented includes a base pan heater. This component helps manage the water produced during winter defrost cycles.

When a heat pump operates in heating mode, frost can form on the outdoor heat exchanger. The unit then starts a defrost cycle to melt this buildup. The water must be able to drain freely without immediately freezing in the bottom of the cabinet.

The elevated positioning visible in Terrebonne complements this function. There is space beneath the unit for water to drain away rather than accumulating directly against the ground or foundation.

However, the installation must still be monitored during the winter. Ice can build up under any heat pump if water accumulates in a poorly drained area or snow is never cleared away.

FrostWash and DuraSpin for the heat exchangers

The Hitachi airHome 600 features FrostWash technology on both the indoor and outdoor units. The indoor process heats, freezes, and then thaws the heat exchanger to remove some of the accumulated contaminants.

Outside, FrostWash works with the DuraSpin function, which temporarily reverses the fan’s rotation to expel certain dust particles and debris.

These functions can help keep the heat-exchange surfaces cleaner, but they do not replace professional inspections. In Terrebonne as well as Montréal, Laval, Longueuil, on the North Shore or the South Shore, an outdoor unit can accumulate:

• pollen;
• leaves;
• seeds;
• dust;
• lint;
• dryer lint;
• compacted snow;
• ice.

The coil must remain clear to allow efficient heat transfer.

Air quality and humidity management

The airHome 600 indoor unit is equipped with a stainless steel pre-filter and a PM2.5 activated carbon filter. Activated carbon helps reduce certain odors, while the filtration targets small particles carried in the air.

A mold protection function circulates air through the internal components and heats the coil after certain cycles to limit residual moisture.

Dry mode is particularly useful on humid days. Depending on the capacity selected, dehumidification may vary, with the larger model able to remove up to approximately 4 litres of moisture per hour under the manufacturer’s test conditions.

Dry mode does not necessarily replace a whole-home or standalone dehumidifier in a very damp basement. However, it can reduce the feeling of heavy air in the space being served.

Wi-Fi control included with airCloud Go

The airHome 600 range includes a Wi-Fi adapter that enables use of the airCloud Go app. The owner can adjust the settings, set a weekly schedule, and monitor the unit’s usage remotely.

The app can also support certain functions, such as:

• remote controls;
• scheduling based on habits;
• energy cost estimates;
• the compatible voice control;
• the location-based Smart-Fence function;
• monitoring the system’s operation.

In a home where occupants have varying schedules, programming prevents the same temperature from being maintained unnecessarily all day.

Precautions to take after installation

Even a properly installed heat pump requires periodic attention. To maintain the performance of this installation in Terrebonne, we recommend, among other things:

Keep the front and back of the unit clear

Objects, plants, tools, and materials must not be stored in front of the fan or too close to the heat exchanger.

Remove snow without hitting the coil

After a storm, snow can be carefully cleared from around the unit. Avoid metal shovels or impacts against the fins.

Monitor ice beneath the supports

A certain amount of defrost water is normal. Any accumulation that reaches the underside of the unit must be corrected before it blocks drainage.

Clean the indoor filters regularly

Clogged filters reduce airflow, increase noise and may decrease heating or cooling capacity.

Do not cover the heat pump in winter

A cover prevents the unit from breathing. Full winter covers are intended for air conditioners that do not operate during the winter, not for heat pumps used for heating.

Mistakes this installation helps prevent

The project completed on this brick wall illustrates several best practices:

• the unit is not placed directly on the ground;
• the fan remains free of obstructions;
• the supports are equipped with anti-vibration devices;
• the lines are protected by an outdoor cover;
• the piping maintains gradual bends;
• the window and wall vent remain accessible;
• the electrical device is installed near the unit;
• the unit can be serviced without complex disassembly.

By contrast, an improvised installation can cause vibrations in the wall, premature deterioration of the insulation, poor drainage or reduced winter performance.

An AirGreen installation adapted to the realities of the North Shore

This Hitachi airHome 600 wall-mounted heat pump installation in Terrebonne depends on more than simply choosing a high-performance unit. The result also depends on wall preparation, the supports used, protection for the connections and compliance with clearance requirements.

The brick wall had unique features, including a window, an existing air vent and a former repaired masonry area. We arranged the installation to use the available space without blocking these elements.

The outdoor unit remains elevated, stable and accessible. The line-set cover creates a clean vertical line, while the connections remain protected from the elements.

We carry out this type of HVAC installation in Terrebonne and throughout Greater Montreal, including Montreal, Laval, Longueuil, the North Shore and the South Shore. Each project is planned according to the building’s structure, heating needs, room layout and actual exterior constraints.