Field Charging; Superheat Charging Chart - Harbor Point HF-25GW Installation, Operation And Maintanance Manual

HARBOR POINT WALL SPLIT DUCTLESS SYSTEMS
Note: If interconnect is less then 25 feet
a small amount of refrigerant may need
to be reclaimed to achieve the proper
charge for optimal operation. We
recommends fine tuning using the
"Superheat" method.
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.
Chart based on 360 to 400 CFM/ton indoor air flow and 50% relative humidity
50
95
45
90
40
35
85
30
80
25
75
20
70
15
10
5
55
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.

FIELD CHARGING

SUPERHEAT CHARGING CHART

Use on systems that cool with capillary or piston
Indoor dry bulb temperature
60 65 70
OUTDOOR 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.
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.
°F
75 80 85
15
90 95 100 105
115
110