YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World!
24
PIPING AND WIRING SIZES-UNITS
Unit
Connection Copper
Pipe Sizes
Min./Max.
/-
Elevation
Wires from
Outdoor to Indoor
Unit
Min. Wire Size
Outdoor
– Indoor
Units
Fuse is Factory
Installed
09K
1/4” Liq. + 3/8” Gas
15/50/30/15
N(1)/2/3/G
18AWG
At Indoor
Control Board
12K
1/4 Liq. + 3/8
” Gas
15/50/30/15
N(1)/2/3/G
18AWG
At Indoor
Control Board
18K
1/4 Liq. +
1/2” Gas
15/75/30/15
N(1)/2/3/G
16AWG
At Indoor
Control Board
24K
1/4 Liq. +
5/8” Gas
15/75/30/15
N(1)/2/3/G
16AWG
At Indoor
Control Board
The indoor unit and the outdoor unit can be at different heights either above or below each other. The height for
the difference must follow the stated requirements shown in the table below.
Keep bending of the piping line to a minimum to avoid any possible negative impacts on the performance of the
units.
Make a P-trap if the elevation drop difference is more than 25 inches, as illustrated below.
Refrigerant Pipe Min/Max. Length, Rise and Drop Height
Btu/h
Min. Length (ft.)
Max. Length (ft.)
Max Rise Height (ft.)
Max. Drop Height (ft.)
09K - 12K
15
50
20
28
18K - 24K
15
75
25
35
INSTALL THE WALL MOUNTING PLATE
Prior to installing the mounting plate, check the unit and make sure the unit is in good condition and ready to
install.
Check to make sure the installation location is strong enough to hold the weight of the whole unit and is in a
location that is convenient to install, maintain, service and close to the outdoor unit.
Install the indoor unit. Use enough anchor bolts to secure the mounting plates to the wall for indoor units. The
mounting plate should be level and secure and ready to receive the indoor unit.
