Daikin AGZ070EH Installation, Operation And Maintanance Manual page 5

Case 1: Open Screening Walls
Decorative screening walls are often used to help conceal a
unit either on grade or on a rooftop. Design these walls such
that the combination of their open area and distance from the
unit do not require performance adjustment. It is assumed that
the wall height is equal to or less than the unit height when
mounted on its base support. If the wall height is greater than
the unit height, see Case 2 for Pit Installation. The distance
from the sides of the unit to the side walls must be sufficient
for service, such as opening control panel doors. For uneven
wall spacing, the distance from the unit to each wall can be
averaged providing no distance is less than 4 feet. Values are
based on walls on all four-sides.
Figure 3: Case 1 Adjustment Factor
Wall Free Area vs. Distance
6
5
4
Distance
from
3
Wall to
Unit (ft)
2
1
0
0 10
IOM 1206-1
20 30 40
% Open Wall Area
AGZ030-070
Installation and Application Information
Case 2: Pit Installation
Pit installations can cause operating problems resulting from
air recirculation and restriction, and require care that sufficient
air clearance is provided, safety requirements are met and
service access is provided. Pit covers must have abundant open
area at least equal to the chiller footprint. A solid wall
surrounding a unit is substantially a pit and this data should be
used.
Steel grating is sometimes used to cover a pit to prevent
accidental falls or trips into the pit. The grating material and
installation design must be strong enough to prevent such
accidents, yet provide abundant open area to avoid
recirculation problems. Have any pit installation reviewed by
the Daikin Applied sales representative prior to installation to
ensure it has sufficient air-flow characteristics and approved
by the installation design engineer to avoid risk of accident.
Figure 4: Case 2 - Pit Installation
50
Figure 5: Case 2 Adjustment Factors (AGZ030E-070E)
6.0
5.0
4.0
3.0
% Capacity
Reduction
2.0
1.0
0.0
0
9.0
8.0
7.0
6.0
5.0
% Pow e r
Incre as e
4.0
3.0
2.0
1.0
0.0
0
Full Load Capacity Reduction (AGZ030-070)
8 10 12
Depth of Pit (ft)
Distance = 4 ft Distance = 5 ft
Power Increase (AGZ030-070)
8 10 12
De pth of Pit (ft)
Distance = 4 ft Distance = 5 ft
13 14
Distance = 6 ft
13 14
Distance = 6 ft
5