Technical Publication

5
4. An accumulator is not required for air conditioners (accumulators are factory installed on heat pumps).
5. An oil trap at the indoor unit is not required.
6. Liquid Line Solenoid not required if non-bleed TXV is used on the outdoor unit.
SECTION 3. OUTDOOR UNIT IS ABOVE THE INDOOR UNIT
Accessory Air Conditioner (AC) Heat Pump (HP)
Crankcase Heater
(40 watts minimum)
Yes Yes
Hard Start Assist
Yes
(See manual for each product)
Yes
(See manual for each product)
TXV (Indoor) Yes Yes
Liquid Line Solenoid at Outdoor
(Kit # LSK02*)
No Yes *See Note 5
Inverted Refrigerant Trap at Indoor No No
Oil Trap at Indoor Yes** Yes**
**An oil trap at the indoor unit is required if the elevation diff erence exceeds 80' (24.4 m). The trap can be constructed of standard
refrigerant fitting (See Figure 3-1.)
1. Suction line must be sloped continuously towards the indoor unit.
2. The maximum elevation (vertical) difference between the outdoor unit and indoor unit is:
a. not restricted in this configuration for single stage air conditioning units (must adhere to
maximum equivalent length).
b. 80 feet (24.4m) for single stage heat pump units. Exception: 200ft (61 m) vertical separation allowed
for 14 SEER Long Line Set models and 16 SEER single stage HP models.
c. 25 feet (7.6 m) for two stage units.
3. Inverted suction loop is not required at either unit.
4. An accumulator is not required for air conditioners (accumulators are factory installed on heat pumps).
5. Liquid Line Solenoid not required if non-bleed TXV is used on the outdoor unit.
Long Radius Street Ell
45°
Street Ell
Short Radius
Street Ell
45°
Ell
Figure 3-1. Oil Trap