LG Tri-Zone Multi F Installation Manual page 50

REFRIGERANT PIPING PREPARATION
Refrigerant Piping Insulation
Underground Refrigerant Piping
Refrigerant pipe installed underground should be routed inside a
vapor tight protective sleeve to prevent insulation deterioration and
water infiltration. Refrigerant pipe installed inside underground
casing must be continuous without any joints. Underground refriger-
ant pipe must be located at a level below the frost line.
Table 38: Utility Conduit Sizes.
Liquid Pipe
1
1/2 (2.0
2,5
1/4 (1.0) 4
3
3/8 (1-1/8) 4
3
1/2 (1-1/2) 5
4
5/8 (1-5/8) 5
4
3/4 (1-3/4) 5
4
OD pipe diameter in inches; Values in parenthesis () indicate OD of pipe with insulation jacket.
1
2 Diameter of pipe with insulation. Thickness of pipe insulation is typical. Actual required thickness may vary based
3 Insulation thickness (value in parenthesis) = 3/8 inch.
Insulation thickness (value in parenthesis) = 1 inch.
4
Insulation thickness (value in parenthesis) = 3/4 inch.
5
Installing the Insulation
1. Insulation material should be longer than the refrigerant piping.
Each vapor and liquid piping must be insulated separately.
2. Place the closed-cell ethylene propylene diene methylene
(EPDM) insulation material carefully around each refrigerant pipe
so as not to damage it. Be sure the insulation material cutting line
is place upward.
3. Apply adhesive to both cut surfaces of the insulation and press
together. Allow adhesive to dry so that the bond is secure and
does not come apart.
Insulating Piping Joints
1. Push the EPDM insulation from the straight piping surrounding
the joint (elbow, outdoor unit to indoor unit piping connection
point, etc.) as close together as possible.
2. Cut a piece of insulation to fit the joint, overlapping the insulation
on the surrounding piping by at least one (1) inch.
3. Apply adhesive to bond all the ends.
4. Secure by completely wrapping narrow vinyl tape around the
insulation / joint so that there are no gaps.
5. Tape should be sufficient to cover the piping so it can fit into the
rear piping housing area at the back of the indoor unit or BD unit
(Multi F MAX systems only).
50
Vapor Pipe
1
) 5/8 (2-1/8 ) 3/4 (2-1/4
2,5
4 4
4 5
5 5
5 5
5 5
Due to our policy of continuous product innovation, some specifications may change without notification.
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Figure 64: Typical Arrangement of Refrigerant Pipe and Cable(s) in a
Utility Conduit.
)
2,5
Figure 66: Correct Cutting Line
Correct
Cutting Line
Gas or Liquid
Insulation
Pipe (Insulated
Separately)
Figure 67: Piping with Insulation Material.
MULTI
MULTI
Vapor Line
Insulation Material
Liquid Line
Pipe Sleeve
Insulation
Material
Min. 18 Gauge
Power/Communication
Cable
Figure 65: Underground Refrigerant Piping.
Placement.
Incorrect
Cutti Cutting Line
Gas Pipe pe
Insulation material
F
F
MAX
L Liquid Pipe