latent heat compressor temperature ventilation brazing hvac merv rating larger filter cabinets condensate drainage issues blower motor total external static pressure tesp filter manufacturer static pressure drop filter change airflow ach50 outdoor air requirements ventilation requirements air changes per hour supply and return air changes per hr interior moisture loads liquid water intrusion radiant heat precision manometer leakage rate air leakiness building problems dehumidifier sealant sealing vapor barrier insulation air barrier indoor air sensor outdoor air dampers outdoor air sensor guts of an economizer free cooling reduce the consumption of energy economizer failed oem never decrease horsepower horsepower replacing a psc with an ecm amps first hard fast rule oem motor replacing a single phase a/c motor kenneth casebier humidity airstreams adiabatic process sensible cooling blower adiabatic cooling determine scfm calculate acfm actual density velocity pressures density determine the airflow measure airflow steven mazzoni acfm vs. scfm graph conduction boiling temperature liquid flash gas mix vapor evaporator coil vapor condensing temperature changing matter refrigerant circuit equalizer take-offs risers steam load header dry return wet return zero-psi steam thomas tredgold british thermal unit residential boiler proper operating pressure dan holohan book steam heating comprehensive simple practic trapping sizing lift overhead lines suction line guidelines discharge check valve failed capacitors miswiring junior tech three phase miswiring loose connector scroll compressor noisy compressor extremely loud compressor practices start-ups key points call-backs pressure from the office give up after a while call other people stuck common cases search vs. research technology business perseverance differentiate temperatures atmospheric pressure freezing boiling absolute zero energy scales conversions demanding on-call professional emotionally prepared lesson emergency heat pump winter pool heater christmas eve moral testo measurequick app additional readings probes quality version specialty tool thermal diversity external loads btus per hour primary load internal zones heat gain heat loss understanding basic tools apprentice new career top tips capping less expensive rod copper applications is more silver worth the price cost and the difference most common rods used phase balance split proper deflection force tension tool proper belt tension belt tension most common in commercial additional things to consider pan positioning drain cleaning float switch location drain pitch moisture problems a bluflame combustion analyzer facts stories valve tips proper diagnosis poe system fangled technology seals soldering leak valves oversizing winding voltage rating voltage boost voltage capacitor new tech comprehensive run test silly mistakes leaving disconnects good practice caps and seals common mistakes analog controls mechanical test microamps on a gas furnace measure milliamps pressure transducer 4-20ma digital vs. analog controls danfoss refrigerant slider comfort cooling evaporator temperatures defrost sequence safety hazards distraction workplace hazards carelessness safety 3 phase voltage imbalance three phase power balancing phases calculate three phase voltage imbalance psychrometric chart total capacity formula sensible heat ratio measurement delta t (δt) universal condenser fan motor condensiting fan motor mentorships and mastermind groups business courses business planning time management static pressure delta t subcooling air conditioning tech tips superheat suction temp
See more