McQuay MDS030AR Applications Manual page 75

Installation of MDB-T series indoor unit
To mount the MDS050~060T in ceiling. As the air outlet flange is close to the unit bottom, when
the unit is mounted in ceiling, the pipe can be laid out easier, effectively reducing the requirement
for room height. After the installation, only the air inlet/outlet is exposed, as shown below.
return air
To check the accessories are ready
To choose the location for installation
Make sure it is easy to connect cables and pipes. Select a place where needs shorter air pipe
and fewer connecting pipe work and ensure the building is with enough strength, ascertain the
pole location and adjust it to keep the unit horizontally, and examine safety of the suspending.
To install the hook
Make sure to fix the hook, and the top suspending part is strong enough to bear the unit weight.
To install the indoor unit
To fix the pole location, examine if it is in the same level with the unit, and check if the
suspending panel is stable; make sure there is a slope oriented to the drainage direction. Pay
attention that the distance between the return air outlet and the heat exchanger inlet shall not
be less than 3m.
To install the refrigerant piping
If units expose to air more than 15s, units shall be vacuumed firstly. If the connecting pipe is
not prepared for indoor unit, do not open sealed parts (valves, joints, rubber, plastic gasket and
copper cap).
Duct working design
Well designed duct working can reduce noise level effectively. When doing this, please
consider the internal air pressure drop shall be equal to ESP, otherwise, air flow may be too
big or too small, and cause the unit failure. It can be solved by adjusting the fan speed to make
them in balance (such as adjusting the air speed of the diffuser).
Installation of drainage piping
a. Slope is required as 1/100, and try to drain in a positive slope.
b. To use suspending bolt to fix the long drainage piping.
c. After installation, to run the leakage test is necessary to ensure it works.
d. Only in cooling mode, there is a need to detect the status of drainage.
Design & installation Guide For McQuay MDS Multi System
duct
ceiling
height
indoor unit
static pressure
box
duct discharge
air
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