Lennox LIUH018021T431E-1 Service Manual page 91

3.5 A6 duct indoor unit installation
3.5.1. Service space for indoor unit
3.5.2. Bolt pitch
3.5.3. Hang indoor unit
1. Please refer to the upper data to locate the four positioning screw bolt hole on the ceiling. Be sure to mark
the areas where ceiling hook holes will be drilled.
2. Install and fit pipes and wires after you have finished installing the main body. When choosing where to
start, determine the direction of the pipes to be drawn out. Especially in cases where there is a ceiling
involved, align the refrigerant pipes, drain pipes, and indoor and outdoor lines with their connection points
before mounting the unit.
3. Install hanging screw bolts.
• Cut off the roof beam.
• Strengthen the place that has been cut off, and consolidate the roof beam.
Installation
Capacity(KBtu)
18
24
36
Size of outline dimension mounted lug
L
920
1140
1400
Indoor unit installation
M
508
598
598
89