Charging During Low Outdoor Ambient w/ Charging Jacket
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When the temperature dips below 65 degrees Fahrenheit, it can be difficult to charge a system probably. In those cases, using a cardboard box to isolate the condenser is inconvenient and looks more than a little sketchy to the customer; the coil can also have hot and cool spots, so the temperature isn’t consistent.
Even though it’s best to test and charge under normal conditions, the Fieldpiece charging jacket can help you charge a TXV straight-cool system or heat pump during low outdoor ambient temperatures.
The Fieldpiece charging jacket works in temperatures between 37 and 70 degrees, and the system pressure needs to stay below 300 PSIG on an R-22 system and 500 PSIG on an R-410A system. The charging jacket restricts the fan outlet, which raises the temperature enough to charge a system decently in low-ambient conditions.
First, you have to turn the system off and install the charging jacket, using the bungee cinch to adjust the opening. You’ll want to start with the top wide open and then restrict the top after the jacket is in place. Restrict the top until the difference between the high and low side pressures is between 160 and 220 PSIG (for R-410A). Let the system stabilize, and then measure the superheat and subcooling.
The manual encourages you to err on the side of caution and not add any refrigerant unless it’s obviously necessary. If the choice is debatable, then you’re better off waiting until the outdoor ambient conditions are warmer.
Sponsored by Fieldpiece: https://www.fieldpiece.com/