28
5.0 SYSTEM START-UP AND REFRIGERANT CHARGING
Start Up
NOTICE:
The refrigerant pressures
provided are for preliminary charge check ONLY.
These pressure values are typical, but may vary due
to application. Evaporator load will cause pressures to
deviate. The values listed are for the correct matched
indoor coil ONLY!
4. If the measured liquid pressure is below the
listed requirement for the given outdoor and indoor
conditions, add charge. If the measured liquid pres
-
sure is above the listed requirement for the given
outdoor and indoor conditions, remove charge.
5.8.4 Final Charging by
Liquid Subcooling
1. After preliminary charging by weight or
pressures, find the design subcooling value. The
correct subcooling value is found at the intersection
of the installed system and the outdoor ambient
temperature on the Charging Chart located inside
the access panel cover.
SC° from Charging Chart = _____°F [_____°C].
IMPORTANT:
Indoor conditions
as measured at the indoor coil are required to
be within 2ºF (1.1ºC) of comfort conditions as pre
-
ferred by the homeowner and must have operated
for at least 15 minutes prior to final charge adjust
-
ment. Unit charging is recommended under the
following outdoor conditions ONLY:
55°F [12.8°C] outdoor dry bulb and above
NOTICE:
If the indoor temperature is
above or below the recommended range, run the
system to bring the temperature down or run the
electric heat/furnace to bring the temperature up.
2. Note the measured Liquid Pressure, Liq Press =
______psig, as measured from the liquid (small) ser
-
vice valve. Use the Temperature Pressure Chart below
to note the corresponding saturation temperature for
R-410A at the measured liquid pressure. Liquid Satu
-
ration Temperature, SAT°= _____°F [_____°C].
3. Note the liquid line temperature, Liq° = _____°F
[_____°C], as measured from a temperature probe
located within 6” [15.2 cm] outside of the unit on the
copper liquid line (small line). It is recommended to use
a calibrated clamp-on temperature probe or an insulat
-
ed surface thermocouple.
4. Subtract the liquid line temperature from the
saturation temperature to calculate subcooling.
SAT°_____°F [_____°C] - Liq°_____°F [_____°C] =
SC°_____°F [_____°C]
5. Adjust charge to obtain the specified subcooling
value. If the measured subcooling level is below the
listed requirement for the given outdoor temperature,
add charge. If the measured subcooling level is above
the listed requirement for the given outdoor tempera
-
ture, remove charge.
5.8.5 R-410A Temperature
Pressure Chart
SATURATION
TEMP
(Deg. F)
[Deg. C]
R-410A
PSIG
SATURATION
TEMP
(Deg. F)
[Deg. C]
R-410A
PSIG
SATURATION
TEMP
(Deg. F)
[Deg. C]
R-410A
PSIG
SATURATION
TEMP
(Deg. F)
[Deg. C]
R-410A
PSIG
-150 [-101]
-
-30 [-34]
17.9
35 [2]
107.5
100 [38]
317.4
-140 [-96]
-
-25 [-32]
22.0
40 [4]
118.5
105 [41]
340.6
-130 [-90]
-
-20 [-29]
26.4
45 [7]
130.2
110 [43]
365.1
-120 [-84]
-
-15 [-26]
31.3
50 [10]
142.7
115 [46]
390.9
-110 [-79]
-
-10 [-23]
36.5
55 [13]
156.0
120 [49]
418.0
-100 [-73]
-
-5 [-21]
42.2
60 [16]
170.1
125 [52]
446.5
-90 [-68]
-
0 [-28]
48.4
65 [18]
185.1
130 [54]
476.5
-80 [-62]
-
5 [-15]
55.1
70 [21]
201.0
135 [57]
508.0
-70 [-57]
-
10 [-12]
62.4
75 [24]
217.8
140 [60]
541.2
-60 [-51]
0.4
15 [-9]
70.2
80 [27]
235.6
145 [63]
576.0
-50 [-46]
5.1
20 [-7]
78.5
85 [29]
254.5
150 [66]
612.8
-40 [-40]
10.9
25 [-4]
87.5
90 [32]
274.3
-35 [-37]
14.2
30 [-1]
97.2
95 [35]
295.3
5.9 Completing
Installation
•
Disconnect the hoses from the pressure ports
Replace the pressure port caps and tighten
adequately to seal caps.
DO NOT overtighten.
•
Replace the service valve top caps finger-tight
and then tighten with a wrench to adequately
seal caps.
DO NOT overtighten.
•
Replace control box cover and service panel
and install screws to secure panels.
•
Restore power to unit at disconnect if required.
•
Exit Charging Mode and configure EcoNet™
Control Center or thermostat per the thermostat
installation instructions and set to desired mode
and temperature.
