www.enviromaster.com
EnviroAir High Wall Ductless Split Systems
15
FIELD CHARGING
The use of the superheat method is highly
recommended for field charging or check-
ing the existing refrigerant charge in a
system that is in the cooling cycle. Because
each installation is different in terms of
indoor air flow, refrigerant line length, etc..,
the factory charge may not be correct
for every application. To assure the best
performance from the air-conditioner, the
refrigerant charge should be checked and
adjusted, if need be, on each installation.
Note:
Refrigerant superheat is the tem-
perature above the suction pressure at
its saturation temperature.
Note:
If operating superheat is more than 5
°
F above the chart value, add refrigerant. If
below the chart value remove refrigerant. If below the limit line, remove refrigerant.
ENVIROAIR HIGH WALL DUCTLESS SPLIT SYSTEMS
For proper superheat readings, a standard
low-side refrigerant gauge and an accurate
thermometer is needed. A mercury or
stem-type thermometer is not adequate
for suction-line temperatures. We recom-
mend electric thermocouple thermometers
(available at most refrigeration wholesal-
ers); however an accurate remote-bulb
thermometer can be used. When measur-
ing the line temperature, be sure the ther-
mometer is securely attached to assure
accurate measurements. The chart below
gives superheat values at various outdoor
temperatures. Allow at least 5 minutes run-
ning time between charge adjustments for
the unit to stabilize.
50
45
35
25
15
55
40
30
20
10
60
65
80
90
85
95
100
105
110
115
75
70
95
90
85
80
75
70
5
SUPERHEA
T CHARGING CHAR
T
SUPERHEAT CHARGING CHART
Chart based on 360 to 400 CFM/ton indoor air flow and 50% relative humidity
Use on systems that cool with capillary or piston
SUPERHEA
T °F
OUTDOOR TEMPERATURE °F
Indoor dry bulb temperature °F
Start the indoor unit, cooling mode is
only allowed when the outside ambient
temperature is above 60° F to prevent
damage to the compressor. Unit has a 3
minute time delay before the compressor
start up operation.
Note:
If interconnect is less then 16
feet a small amount of refrigerant may
need to be reclaimed to achieve the
proper charge for optimal operation.
EnviroAir recommends fine tuning us-
ing the “Superheat” method.
