Commercial RTU Repair & Rooftop HVAC Service in Calgary

Commercial Rooftop Unit Repair in Calgary

A failed rooftop unit can affect tenant comfort, business operations, building temperatures and critical areas of a commercial facility.

Central Comfort troubleshoots and repairs commercial rooftop HVAC equipment experiencing problems including:

• No heat
• No cooling
• Insufficient heating or cooling
• RTU will not start
• Intermittent operation
• Poor airflow
• Blower or fan problems
• Compressor problems
• Refrigerant leaks
• Ignition failures
• Flame-proving problems
• Electrical and control faults
• High- or low-pressure safety trips
• Frozen evaporator coils
• Dirty or restricted coils
• Economizer problems
• Thermostat and control issues
• Unusual noise or vibration
• Repeated equipment shutdowns

Our objective is not simply to reset the unit or replace a component without determining why it failed. We investigate the operating condition of the equipment, identify the probable cause and verify operation after the repair.

RTU Troubleshooting & Diagnostics

Effective commercial HVAC repair starts with proper diagnosis.

Depending on the complaint and equipment configuration, an RTU diagnostic may include checking:

• Thermostat or BAS demand
• Supply and return-air temperatures
• Airflow and filter condition
• Blower operation
• Belts, motors and bearings where applicable
• Heating operation
• Gas and ignition components where applicable
• Flame-safety operation
• Compressors and condenser fans
• Refrigeration pressures and temperatures when required
• Evaporator and condenser coil condition
• Electrical components
• Contactors, relays and controls
• Equipment safeties
• Economizer operation
• Condensate drainage
• Control sequence
• Overall equipment condition

Measurements are taken when they are relevant to the problem rather than simply replacing parts based on symptoms.

After repairs, the affected operation is tested to verify that the rooftop unit is functioning correctly.

Commercial RTU No Heat

Calgary winters make rooftop heating failures a high-priority commercial service problem.

An RTU that is running but not producing heat—or repeatedly shutting down—can have several possible causes. Depending on the equipment, problems may involve:

• Ignition controls
• Flame sensors
• Gas valves
• Burners
• Pressure switches
• Inducer motors
• Supply-air blowers
• Limit and safety controls
• Thermostats or building controls
• Electrical components
• Wiring or control circuits
• Airflow restrictions

Central Comfort diagnoses the complete operating sequence before recommending the appropriate repair.

If repeated failures indicate a larger equipment problem, we can also evaluate whether continued repair or planned replacement makes more financial sense.

Commercial RTU No Cooling

When a commercial rooftop unit runs but cannot maintain space temperature, the problem is not necessarily the compressor or refrigerant charge.

Cooling problems can result from:

• Compressor failures
• Refrigerant leaks
• Condenser fan problems
• Restricted airflow
• Dirty evaporator or condenser coils
• Electrical component failures
• Control problems
• Failed sensors
• Safety trips
• Frozen evaporator coils
• Economizer problems
• Incorrect operating sequence

Our technicians evaluate the relevant refrigeration, electrical, airflow and control conditions to determine the actual cause of the cooling problem.

RTU not heating or cooling properly?

Commercial RTU Preventive Maintenance

Preventive maintenance can identify developing problems before they become emergency service calls.

Central Comfort can include rooftop units in a scheduled commercial HVAC maintenance program. Depending on the equipment and maintenance scope, RTU service may include inspection of:

• Filters
• Belts
• Blowers and fans
• Motors
• Bearings
• Evaporator and condenser coils
• Electrical components and connections
• Heating components
• Burners and ignition systems
• Refrigeration operation
• Condensate systems
• Economizers
• Thermostats and controls
• Equipment safeties
• Overall unit condition

Relevant operating readings, deficiencies and recommended actions can be documented to help building owners and property managers plan repairs and future capital expenditures.

For facilities with multiple rooftop units, equipment records can also help identify recurring problems and units approaching the end of their practical service life.

RTU Repair vs. Replacement

Not every older rooftop unit needs to be replaced, and not every failed RTU is worth continuing to repair.

Central Comfort evaluates the practical factors affecting the decision, including:

• Equipment age
• Overall condition
• Repair history
• Current repair cost
• Availability of replacement parts
• Compressor and heat-exchanger condition
• Refrigerant considerations
• Energy efficiency
• Capacity and building requirements
• Reliability
• Expected remaining service life
• Cost of future failures

For a relatively healthy unit with an isolated failure, repair may remain the best option.

For equipment experiencing repeated major failures, obsolete components or high operating costs, planned replacement may provide better long-term value.

We provide recommendations based on the equipment condition and commercial requirements rather than automatically recommending replacement.

Commercial RTU Replacement & Installation

When replacement is appropriate, Central Comfort can coordinate commercial rooftop-unit replacement and installation. A project may include:

• Existing equipment assessment
• Building and application review
• Equipment selection
• Capacity review
• Replacement planning
• Permit coordination where applicable
• Crane coordination
• Removal of existing equipment
• Roof curb or curb-adapter requirements
• Ductwork modifications
• Gas piping coordination
• Electrical and controls coordination
• New RTU installation
• Start-up
• Operational testing
• Commissioning

Careful planning is particularly important when replacing older rooftop units because new equipment dimensions, curb arrangements, capacities, electrical requirements and controls may differ from the existing equipment.

Central Comfort also works with general contractors on commercial construction and HVAC replacement projects.

RTU Service for Property Management Companies

Commercial property managers need more than individual emergency repairs. Central Comfort supports property management companies with:

• Scheduled RTU maintenance
• Service and repair
• Equipment identification and records
• Condition reporting
• Deficiency documentation
• Repair recommendations
• Replacement planning
• Multi-unit and multi-property service
• Commercial refrigeration and MUA service where applicable

Maintaining an accurate history for each piece of equipment helps property managers make better repair and capital-planning decisions.

RTU Service for Commercial Buildings

We service rooftop HVAC equipment in a range of commercial environments, including:

Commercial HVAC Service Across Calgary & Southern Alberta

Central Comfort Ltd. provides commercial HVAC and refrigeration service in Calgary and throughout our Southern Alberta service area. Our focus is commercial and industrial equipment.

If your rooftop unit has stopped operating, cannot maintain temperature or requires planned maintenance or replacement, contact Central Comfort to arrange an assessment.

For make-up air heating, ignition or airflow problems, see our commercial make-up air unit repair and service in Calgary.

Related services: Commercial HVAC services · Make-up air units, rooftop equipment and exhaust fans · Commercial kitchen HVAC.

Frequently Asked Questions

Do you repair commercial rooftop units in Calgary?

Yes. Central Comfort provides troubleshooting, repair and maintenance for commercial rooftop HVAC units in Calgary and our Southern Alberta service area.

Why is my commercial RTU running but not heating?

Possible causes include ignition problems, flame-proving faults, gas-control issues, airflow problems, safety trips, failed motors, electrical faults or thermostat/building-control problems. The operating sequence should be diagnosed before determining the repair.

Why is my rooftop unit running but not cooling?

Possible causes include airflow restrictions, dirty coils, refrigeration problems, compressor or condenser-fan failures, electrical faults, control problems, economizer issues or safety trips. Proper diagnosis is required to determine the actual cause.

Should I repair or replace an older rooftop unit?

The decision depends on equipment age and condition, repair history, repair cost, parts availability, efficiency and expected remaining service life. Central Comfort can evaluate the equipment and provide repair-versus-replacement recommendations.

Do you provide preventive maintenance for rooftop units?

Yes. Rooftop units can be incorporated into a commercial preventive-maintenance program with equipment inspections, relevant operating measurements, deficiency reporting and repair recommendations.

Can you replace commercial rooftop units?

Yes. Central Comfort provides commercial RTU replacement and installation, including equipment assessment, replacement planning, crane coordination, curb and ductwork considerations, installation, start-up and operational testing.

Call Central Comfort · RTU Service