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52 | APPLICATION GUIDELINES
Single Zone Extended Piping Wall Mounted Engineering Manual
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PLACEMENT CONSIDERATIONS
Installing Outdoor Units Indoors
1. Outdoor Unit Enclosure: Manual Door Open Type.
2. Louver Angle: No More Than 15° Horizontally.
3. Space Between Louvers: More than 4 inches (Recommend).
4. Louver Shape: Wing or Plane Type.
Inside
Outside
Air flow passing through
the louver blade backwards
can generate noise.
In
side
Maximum 15°
(Recommended)
More than 4 in.
(Recommended)
Louver
• Open Rate and Inlet must be taken into consideration when design-
ing the louvered outdoor unit enclosure.
• 'RQRWXVH³6´W\SHORXYHUV
If the Louver Open Rate is Too Small
1. Noise can occur because of the increased air velocity passing
through the louver blade.
2. Noise can occur from louver blade vibrations.
3. A drop in outdoor unit fan performance (excess static pressure
can cause a drop in outdoor unit performance and heat exchanger
efficiency).
4. If the louver open rate is too small or there is insufficient air flow
exchange, the air conditioner might stop operating.
Figure 32: Louver Recommendations.
Figure 33: Using “S” Type Louvers.
Provide a means to drain the condensate generated during heating mode and defrost cycle in addition to rainwater that infiltrates the inlet
louver enclosed area.
• Install a field-provided drain pan under the outdoor units and provide a path to a nearby floor drain.
• If the ambient air temperature is expected to drop below 32°F in the enclosure, heat the bottom surface of the pan, drain line, and floor
drain so that the condensate does not freeze before reaching the drain.
Louver Recommendations for Outdoor Unit Enclosure
Allow for ventilation intake and exhaust air based on maximum outdoor unit fan capacity.
• Select the size, type and orientation of architectural louvers with adequate “net free area” face velocity to ensure the total external static
pressure from the outdoor unit fan does not exceed design limitations (see specification data tables).
• No obstructions must be placed in front of the louver that could hamper the free flow (throw) of air.
• Roof top openings and / or discharge and supply louvers must be equipped with screens to prevent bird and insect infiltration.
For louver recommendations, see below and on the next page.
As always, the best solution for each project balances acceptable heating performance (considering local weather conditions), capital costs,
life cycle energy consumption, and limitations set forth by local building codes.
When deciding on a location to place the outdoor unit, be sure to choose an area where run-off from defrost will not accumulate and freeze on side-
walks or driveways which will create unsafe conditions.
CAUTION
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