Willis WST12MC16S Service Manual page 32

3.2 Connection of piping
1.Align the center of the pipes and sufficiently tighten the flare nut
by hand.
Indoor unit tubing
2.Tighten the flare nut with a wrench.
Wrench
Indoor unit tubing
Outside diameter
mm
Ø6.35
Ø9.52
Ø12.7
Ø15.88
Ø19.05
If drain hose extension or embedded drain piping is required,
use appropriate parts that match the hose front end.
Insert drain hose into the handle of drain pan, and join
drain hose and connecting hose according to the figure by.
Shield pipe
Drain hose Inside the room
CAUTION CAUTION
Insert the drain hose and drain cap into the drain port, mak-
ing sure that it comes in contact with the back of the drain
port, and then mount it. If the drain hose is not connected
properly, leaking will occur.
• Attach the Insulation (Drain hose) to the drain hose.
Drain hose
Wiring the connecting cable can be carried out without remov-
ing the front panel.
1. Remove the air inlet grille. Open the air inlet grille upward and
pull it toward you.
2. Remove the terminal cover and cord clamp.
3. Insert the connecting cable (or as according to local regula-
tions/codes) into the pipe hole on the wall.
4. Pull the connecting cable through the cable slot on the rear
panel so that it protrudes about 15 cm out of the front.
38
Flare nut Pipes
Open-end wrench (fixed)
Flare nut
Connection pipe
Torque
kg . m
inch
1/4 1.8
3/8 4.2
1/2 5.5
5/8 6.6
3/4 6.6
Extension drain hose
Insulation (Drain hose)
5. Insert the connecting cable fully into the terminal block and
secure it tightly with screws.
6. Tightening torque: 1.2 N•m (0.12 kgf•m).
7. Secure the connecting cable with the cord clamp.
8. Attach the terminal cover, rear plate bushing and air inlet grille
on the indoor unit.
CAUTION
• Be sure to refer to the wiring system diagram
labeled inside the front panel.
• Check local electrical regulations for any
specific wiring instructions or limitations.
Screw
Connecting cable
About 15 cm
70 mm
10 mm
10 mm
Installation Manual
Terminal cover
Screw
Cord clamp
Terminal block
Earth wire
Connecting cable
Terminal block
Earth line
50 mm