HVAC Excellence Heat Pump case studies
HVAC Excellence Heat Pump · Put your knowledge to work in context.
HVAC Excellence is a program of ESCO Group, based in Mt. Prospect, Illinois, that describes itself as developing standards and resources that strengthen the quality of education, training, credentialing, and workforce development across the HVACR and building science industries. The HVAC Excellence Heat Pump case studies are 5 cases and about 2,661 words.
1Heating-Mode Cycle Analysis on an R-410A Split System
An R-410A 3-ton split heat pump is operating in heating mode at 35°F outdoor ambient and 70°F indoor return air. After 15 minutes of steady operation, the technician records: suction pressure 105 psig at the outdoor service port; suction line temperature 52°F; liquid line pressure 310 psig; liquid line temperature 92°F; discharge pressure 340 psig; indoor supply air 92°F.
569 words, about 3 min2Auxiliary Heat Call That Opens the High-Limit Switch
On a 2.5-ton heat pump with a 10-kW electric heat kit, the homeowner reports that the system runs continuously and the indoor temperature stays about 4°F below setpoint on a 25°F night. The thermostat is set to 72°F and is configured for heat pump with auxiliary heat.
530 words, about 3 min3Reusing an Acid-Contaminated Line Set for an R-410A Replacement
A contractor is replacing a failed 2-ton R-22 heat pump with a new 2-ton R-410A unit. The existing line set is 35 ft long with a 20-ft vertical rise; it is routed inside a finished wall and cannot be visually inspected.
543 words, about 3 min4Low-Ambient Commissioning of a New R-410A Heat Pump
On a 40°F day, a technician commissions a new 3-ton R-410A heat pump in heating mode. The line set is 40 ft; the outdoor unit is factory-charged with 12 lb 0 oz for 15 ft of line, and the manufacturer specifies an additional 0.6 oz per foot beyond 15 ft.
501 words, about 3 min5Compressor Lockout After a Breaker Trip
A 3-ton R-410A heat pump has a 240-V single-phase compressor. The breaker trips 8 seconds after a heat call.
518 words, about 3 min