29
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 (indoor coil in cooling
mode/outdoor coil in heating mode) 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 pressure 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
preferred by the homeowner and must have
operated for at least 15 minutes prior to final
charge adjustment. Unit charging is recommended
under the following outdoor conditions ONLY:
Cooling Mode: 55°F [12.8°C] outdoor dry bulb
and above
Heating Mode: Between 40°F [4.4°C] and 60°F
[15.6°C] outdoor dry bulb
NOTICE:
Systems should not be charged
below 40°F [4.4°C] outdoor temperature.
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, 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 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 temperature, remove
charge.
5.0 SYSTEM START-UP AND REFRIGERANT CHARGING
5.8.5 R-410A Temperature
Pressure Chart
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.
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
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