Central Heating and Air Conditioning Systems
Performance testing of central heating and air conditioning systems compares key benchmarks for each component and the net performance of the entire system. Each component has ratings and benchmarks that are provided to us by the manufacturer, the actual test measurements taken are compared to these benchmarks to confirm normal operation and performance.
Each component is tested and scrutinized as compared with the manufacturers rated performance values. Electrical amp draws are compared with rated amp draws ; refrigerant temperatures and pressures are plotted on performance curves provided by the manufacturer. Real time weather conditions are factored into measurement comparisons.
System performance is evaluated based upon the results of individual component tests and total output measured in the air stream and spaces served. Performance testing verifies that systems are delivering the efficiency expected.
Air Conditioning Test & Balance
Variances in room to room temperature levels indicate air balance or control problems, or both. Air test and balance measurements tell us where the systems capacity is being delivered within the floor-plan.
Air volume to individual rooms may be redistributed to other rooms and the changes are confirmed by repeating measurement.
Ventilation & Smoke Detectors
Johnson's tests residential and commercial exhaust and ventilation rates. Fans and controls are adjusted until the optimum balance is achieved. We test all brands of duct mounted smoke detectors.
Refrigerant Pressure Testing
Refrigerant leaks in system components or piping are confirmed using dry nitrogen pressurization. Testing may be standing pressure measurements that immediately indicate leak points or isolation pressure tests that confirm concealed leaks over a 24 to 48 hour test duration.
Working pressure measurements are used to document normal operation of all components while the equipment is operating. Pressures and temperatures are the primary indicators of performance and efficiency.
Refrigerant Leak Detection
Johnson's uses electronic leak detection instruments to pinpoint leak locations in pressurized components and accessible segments of refrigerant piping.
Electric Motors & Compressors
Johnson's tests electric compressors, pumps and fans. Internal motor armature windings are tested with the motor disconnected from the power supply. Measurements taken during operation include voltage and amperage tests. Motor ratings are the basis of comparison for data collected.
Communicating, Digital and Low Voltage Controls
Johnson's tests all control devices to confirm normal operation in all modes. Limits, overloads and safety devices can be confirmed to function properly. Thermostats and other user interfaces are checked to assure they are accurate and responsive to user commands.
Advanced control systems and network control systems are configured and tested using LED operation and fault codes or hand-held interfaces. Some controls can be directly connected or connected by wireless network to a computer, smart phone or tablet.
Temperature & Relative Humidity Measurement
Temperature and humidity measurements and calculations are used to diagnose comfort and moisture issues for occupants and building components. Accurate measurements of indoor spaces, outside air ventilation and exhaust air streams and infiltration indicate the nature of the humidity issue.
Data Logging & Reporting
Johnson's uses data logging equipment to identify environmental trends over hours, days or weeks. The data is collected using portable sensors that collect key environmental data. Electrical logging sensors are used to record durations of system operation over the same time sample. Actual temperatures and relative humidity levels are plotted along with system operation curves. The data indicates changes that occur during occupancy and at night or during cooler weather. The data is used to make determinations about air balance and control settings.