34
START-UP
Checking Refrigerant Charge (cont�)
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� System subcooling values provided in
the Charging Chart for outdoor dry bulbs
corresponding to conditions outside of the above
range are provided as reference ONLY�
2� Note the measured Liquid Pressure, Pliq =
______psig, as measured from the liquid
(small) service valve� Use the Temperature
Pressure Chart below to note the corresponding
saturation temperature for R-410A at the
measured liquid pressure�
Liquid Saturation 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 insulated 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 subcool is below the listed
requirement for the given outdoor and indoor
conditions, add charge� If the measured subcool
is above the listed requirement for the given
outdoor and indoor conditions, remove charge�
Finishing Up Installation
• Disconnect pressure gauges from pressure ports;
then replace the pressure port caps and tighten
adequately to seal caps� Do not overtighten.
• Replace the service valve caps finger-tight
and then tighten with an open-end wrench
adequately to seal caps� Do not overtighten.
• Replace control box cover and service panel and
install screws to secure service panel�
• Restore power to unit at disconnect if required.
• Configure indoor thermostat per the thermostat
installation instructions and set thermostat to
desired mode and temperature�
NOTICE: Systems should not be fine-
tune charged below 40°F [4.4°C] outdoor dry bulb.
IMPORTANT: Excessive use of
elbows in the refrigerant line set can produce
excessive pressure drop� Follow industry
best practices for installation� Installation
and commissioning of this equipment is to
be performed by trained and qualified HVAC
professionals� For technical assistance, contact
your Distributor Service Coordinator�
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 [-18] 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
Refrigerant