Mitsubishi Electric Fresh Master GUF-50RDH4 Installation Instructions Manual page 9

5.2. Attaching the duct connecting
flanges
Use the screws supplied to secure the duct connecting flanges to the
Fresh Master.
Caution:
- Before attaching the duct connecting flanges, check that no
foreign matter (scraps of paper, vinyl, etc.) has found its way
inside the main unit.
- Replace the screws that were removed when the duct con-
necting flange was removed back in place and securely
tighten them.
Duct connecting flange
5.3. Hanging the unit body
1. Hang the ceiling suspension fixtures on the hanging bolts and
adjust in such a way that the main unit is level.
2. Tighten up securely using double nuts in order to prevent loose-
ness.
Caution:
- When suspending the main unit from the ceiling, do not
handle it in such a way that force will be applied to the con-
trol box.
- Fasten the body so that it is oriented horizontally. (within 1°)
Fresh Master
GUF-100RDH4 GUF-50RDH4
GUF-100RD4 GUF-50RD4
Nut Washer
5.4. When changing the direction of
the out door side duct (EA/OA)
Remove the flange cover and suspension fixture.
1. Remove the four mounting screws for the flange cover and re-
move the flange cover.
2. Remove the screws at the top mounting position.
3. Remove the ceiling suspension fixtures and attach them at higher
mounting positions.
4. Tighten up the screws in the screw hole where the ceiling suspen-
sion fixtures were removed in order to prevent air leaks.
Flange cover
Mounting screw
Celling suspension fixture
Ceiling suspension fixture
Screw
Screw
Mounting the duct connection flange
1. Use the mounting screws provided to mount the duct connection
flange to the main body.
2. Use the four mounting screws that were removed to attach the
flange cover.
5.5. Connecting the ducts
1. Fit the ducts securely into the duct connecting flanges, and wind
aluminium tape available from a field supply around them to pre-
vent air leaks.
2. Suspend the ducts from the ceiling so that their weight will not be
applied to the Fresh Master.
3. The exhaust/outdoor and supply ducts must be covered with heat-
insulating material in order to prevent condensation from forming.
Heat-insulating material
Exhaust/outdoor/supply ducts
Duct connecting flange
Caution:
- The main unit is equipped with connection locations for equi-
potential connection of ducts.
- Down ward gradient of outdoor duct: 1/30 or more (toward
wall side)
- Provision of distance for the exhaust/outdoor ducts in table
below (to prevent rain water from seeping in)
Model
GUF-50RDH4, GUF-50RD4
GUF-100RDH4, GUF-100RD4
- Before connecting the ducts, check that no sawdust or any
other foreign matter (scraps of paper, vinyl, etc.) has found
its way inside the ducts.
- Do not touch the damper plate inside the main unit when con-
necting the ducts.
- Do not install the ducts in the ways illustrated below. Do-
ing so will reduce the air volume and give rise to abnormal
sounds.
- Extremely - Bends right next
sharp bends to the outlet
- Multiple bends
Duct
Taping
Aluminium tape
Main unit
Distance
1 m or more
2.5 m or more
- Extreme reduction in
the diameter of the
connected ducts
7