Engineering Manual

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82 | STD. WALL-MOUNTED
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F
Connecting the Indoor Unit Piping to the Field-Installed Piping
If the drain hose is routed inside
a room, add insulation to prevent
condensation from forming.
1. Center align the indoor unit piping (refrigerant and drain) and the field-installed
piping, then hand tighten the flare nut.
2. Tighten the flare nut with a torque wrench.
3. Attach the drain tube piping to the indoor unit drain hose as shown.
Indoor unit piping
Flare nutField-installed
piping
Spanner
Field-installed
piping
Flare nut
Torque
wrench
Figure 100:Indoor Unit to Field-Installed Piping Connection.
Narrow tape
Adhesive
Drain extension
Indoor unit
drain hose
Figure 101:Extending the Drain Hose.
Bands
Insulation
Narrow tape
Field-supplied
piping
Wide tape
Wrap with tape
Indoor unit
piping
Piping
Wrap with tape
Drain hose
Piping
Wide tape
1.
2.
3.
Figure 102:Insulating the Piping.
Installation and Best Layout Practices
STANDARD WALL-MOUNTED INDOOR UNITS
Figure 103:Drain Piping Slope.
Checking the
Drainage System
Drain pan
Drain
hose
Drain hose
connection
Check for
leaks
Check for
leaks
Figure 104:Checking the Drainage
System.
Drain Slope
Drain hose should point
down so water can flow
away easily.
Slope Down
1. Pour water on the indoor
unit evaporator.
2. Ensure the water flows
through and out of the
hose and away from
the indoor unit without
leaking.
Refrigerant Piping Insulation
Field-installed vapor and liquid refrigerant piping lines must be properly and completely covered in
insulation (up to the indoor unit piping connections). Any exposed piping may generate conden-
sate or will cause burns if touched. Insulation for this field-installed refrigerant piping must have a
minimum heat resistance of 248°F.
Drain Piping Insulation
Drain piping must have insulation a minimum of 7/32 inches thick.
Installing the Insulation
1. Overlap the insulation at the connection of the field-installed piping and the indoor unit piping.
Tape together so that no gaps exist.
2. Secure insulation to the rear piping housing section with vinyl tape.
3. Bundle the piping and drain hose with tape where they meet at the back of the indoor unit
frame. Position the drain hose at the bottom of the bundle (positioning the drain hose at the
top of the bundle may cause the drain pan to overflow inside the indoor unit).
Insulating the Refrigerant and Drain Piping