Section 2. Outdoor Unit And Indoor Unit Are At The Same Elevation - Daikin RR20AVAK9 Installation & Service Reference

If hanging line set from a joist or rafter,
use metal strapping
or heavy nylon wire tires
that are securely anchored.
11. Heat Pump Application Only. Liquid line solenoid must be installed less than 2 feet (61cm) from the outdoor unit
following the solenoid supplier information for installation.
12. Heat Pump Application Only. Heating piston change (in the outdoor unit) is not required.
13. Final Charge Adjustment. All units must have refrigerant charge verified by proper adjustment of subcooling at the
indoor unit after initial charge adjustment per Section 5. Proper adjustment means pressure and temperature of the
liquid line at the indoor unit must be measured to calculate subcooling at the indoor unit. If subcooling at the indoor
unit is less than 5°F, then additional refrigerant must be added until this subcooling level is achieved. If subcooling at
the indoor unit is more than 7°F, then refrigerant must be removed until this subcooling level is achieved.

Section 2. Outdoor Unit and Indoor Unit are at the Same Elevation

Accessory
Crankcase Heater (40 watts minimum)
Hard Start Assist
TXV (Indoor)
Liquid Line Solenoid at Outdoor
(Kit # LSK02*)
Inverted Refrigerant Trap at Indoor
Oil Trap at Indoor
1. In a completely horizontal installation with a long line set where the indoor unit is at the same altitude as (or slightly
below) the outdoor unit, the line set should be sloped continuously towards the indoor unit. This helps reduce refrigerant
migration to the outdoor unit during a system's off-cycle.
2. The maximum elevation (vertical) difference for this section to be applicable is 10 feet (3.0 m) separation between
outdoor unit and indoor unit. If outdoor unit is more than 10 feet (3.0 m) above indoor unit use Section 3. If outdoor
unit is more than 10 feet (3.0 m) below indoor unit use Section 4.
3. Inverted suction loop is not required at either unit.
8' (2.4 m)
Floor Joist or
Roof Rafter
Metal Sleeve
Strapping placed
around the suction line only
T ape or Wire Tie
Figure 1-3. Installation of Refrigerant Piping (Horizontal)
Wire Tie
(around suction line only)
T ape or Wire Tie
8' (2.4 m)
After the suction line has been strapped to the joist or rafter at 8' (2.4 m) intervals,
strap the liquid line to the suction line.
Air Conditioner (AC)
Yes
Yes
(See manual for each product)
Yes
No
No
No
29
Floor Joist or Roof Rafter
Heat Pump (HP)
Yes
Yes
(See manual for each product)
Yes
Yes *See Note 6
No
No