2.2.1 Room Considerations
Precision air conditioning equipment is designed to control spaces within close tolerances of temperature and
humidity. However, the room must be built with a proper vapor barrier. A film of polyethylene is often used on
walls and ceilings. Walls and floors must also be painted with a vapor seal paint. All doors to the controlled space
should be equipped with weather seals to prevent the infiltration of non-neutral conditioned air from external
spaces. Failure to provide a vapor barrier can compromise the ability to control space conditions.
Reference: See the Mini-dap4 or dap4 Installation, Operating and Maintenance Manual (IOM) for allowable
operating conditions and ranges.
Introduction of outside air into the space should be minimized. Outside air more than 5% of the total circulated air
volume can have a significant effect on the overall space conditions and result in poor space control. All outside air
that is introduced should be conditioned to the humidity and temperature parameters of the environmental control
unit set points to maintain proper room conditions and to prevent the units from running excessively to maintain
the room’s conditions.
For floor units, verify that the floor is level and solid enough to support the unit.
The equipment must be level to operate properly and prevent damage to the internal components. Shimming
and/or grouting may be necessary. This is to ensure the unit base is on a perfectly flat plane.
For ceiling units, verify the unit is level or slightly pitched towards the condensate drain, solid, and supported. It is
recommended that support is structurally engineered to prevent flexing, sagging or twisting. Do not obstruct door
operation, filter access, piping, electrical controller enclosure or control connections with suspension members.
For all units, avoid the transfer of vibrations to the mounting materials which may cause audible noise.
Locating Floor Units
Move the unit in its upright position to the installation site. It is recommended that the unit be protected from
damage to the doors during any storage or moving. Removal of the doors is easily accomplished using the spring-
loaded upper hinge and lifting the fixed lower hinge pin on the bottom of the door up and out of the lower hinge
plate. The doors may be removed without moving the equipment.
The shipping skid should be left in place if the unit is being moved with a forklift. If the unit is being lifted, use
spreader bars to prevent damage to the doors and panels. If necessary, remove the doors prior to lifting the unit.
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