Friedrich PTAC System Repair in Westmount

A typical service call turned into a complete performance restoration

At AirGreen , we are often called upon to work on PTAC (Packaged Terminal Air Conditioner) systems installed in high-end residential buildings or urban condominiums. This was the case for this Friedrich PTAC , installed in a bright apartment in Montreal's Westmount neighborhood. The unit, mounted directly under a large window, was no longer producing stable heating or cooling—a common problem with aging systems exposed to multiple seasonal cycles without comprehensive maintenance.

On-site diagnosis: loss of efficiency and internal overheating

Upon arrival, our certified technician performed a complete inspection of the Friedrich module. The symptoms reported by the customer were clear:

• Warm air in air conditioning mode ;

• Frequent compressor shutdowns ;

• Abnormal noises when starting ;

• And, above all, moisture buildup under the unit .

Initial analysis revealed significant fouling of the air exchanger and a slow main fan . These two factors caused internal overheating and a preventive compressor shutdown. Using a probe thermometer and a digital pressure gauge, we confirmed a refrigerant pressure imbalance , typical of neglected maintenance over several seasons.

Repair and refurbishment steps

1. Deep cleaning of the coil :
   The condenser and evaporator were cleaned with a biodegradable detergent designed for aluminum surfaces and then rinsed at low pressure.

2. Blower Motor Lubrication and Realignment :
   After dismantling the casing, we applied a specific high-temperature lubrication to the fan shaft, then realigned the rotor to eliminate vibrations.

3. Checking the electrical circuit :
   We tightened the main relay connections and replaced a weakened start capacitor (measured at 28 µF instead of the required 35 µF).

4. Recharging R-410A refrigerant :
   A precise top-up was performed, bringing the pressure back to 115 psi at rest—in line with Friedrich specifications for this model.

5. Final test and calibration :
   At the end of the intervention, the system reached a blowing temperature of 11°C in air conditioning mode, and perfect stability in heating.

Result: restored performance and comfort regained

Thanks to this comprehensive intervention, the client has regained stable and silent thermal comfort , without the need for costly replacement. We also recommended the installation of a washable electrostatic filter and an annual AirGreen maintenance contract , in order to avoid the return of these typical problems of dust and condensation.

Our expertise in PTAC systems

Friedrich PTAC units are common in condominiums, hotels, and rental buildings across Greater Montreal. They offer a compact, all-in-one solution, but require regular attention to prevent:

• condensate leaks ,

• thermostat failures ,

• and premature corrosion of the coils.

At AirGreen , we are experts in the repair and maintenance of these devices, whether they are Friedrich, GE, Amana, Gree or LG , throughout the country: Montreal, Laval, Longueuil, the North Shore and the South Shore .

AirGreen Prevention and Advice

• Clean filters monthly during the active season.

• Avoid blocking the suction grille with curtains or furniture.

• Have the unit inspected before the heating season, especially if it runs 24/7.

• Check that the condensate drain remains free and unobstructed.

These simple actions significantly extend the life of a PTAC and reduce energy consumption by up to 20%.

AirGreen — Repair, maintenance and optimization of HVAC systems in Greater Montreal.
We bring your Friedrich systems back to life and ensure your comfort all year round.