126S: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
9
Unit is factory charged for 15ft (4.57 m) of lineset. Adjust charge by
adding or removing 0.6 oz/ft of 3/8 liquid line above or below 15 ft.
(4.57 m) respectively.
Allow system to operate at least 15 minutes. If conditions are favorable,
check system charge by super heat method for fixed metering device and
subcooling method for TXV. If any adjustment is necessary, adjust
charge slowly and allow system to operate for 15 minutes to stabilize
before declaring a properly charged system.
If the indoor temperature is above 80°F (27°C), and the outdoor
temperature is in the favorable range, adjust system charge by weight
based on line length and allow the indoor temperature to drop to 80°F
(27°C) before attempting to check system charge by subcooling method
as described above.
If the indoor temperature is below 70°F (21°C), or the outdoor
temperature is not in the favorable range, adjust charge for line set length
above or below 15 ft. (4.57 m) only. Charge level should then be
appropriate for the system to achieve rated capacity. The charge level
could then be checked at another time when the both indoor and outdoor
temperatures are in a more favorable range.
NOTE: If line length is beyond 80 ft (24.38 m) or greater than 35 ft
(10.7 m) vertical separation, See Long Line Guideline for special
charging requirements.
Units with TXV
Units installed with cooling mode TXV require charging by the
subcooling method.
1. Operate unit a minimum of 15 minutes before checking charge.
2. Measure liquid service valve pressure by attaching an accurate gage
to service port.
3. Measure liquid line temperature by attaching an accurate thermistor
type or electronic thermometer to liquid line near outdoor coil.
4. Refer to unit rating plate for required subcooling temperature.
5. Refer to Table 2. Find the point where required subcooling
temperature intersects measured liquid service valve pressure.
6. To obtain required subcooling temperature at a specific liquid line
pressure, add refrigerant if liquid line temperature is higher than
indicated or reclaim refrigerant if temperature is lower. Allow a
tolerance of ±3°F (±1.7°C).
* For 15 ft. (4.57 m) line set.
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