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Low Ambient Temperature Head Pressure Control
— If the
unit is equipped with the low ambient temperature head pres-
sure control option, field-fabricated and field-installed wind
baffles are required if the wind velocity is anticipated to be
greater than 5 mph (8 km/h). Two different baffles may be re-
quired, facing the control box. Wind baffles should be con-
structed with minimum 18-gage galvanized sheet metal or oth-
er suitable corrosion-resistance material with cross breaks for
strength. See Fig. 30. Use field-supplied screws to attach baf-
fles to the corner posts of the machine. Be sure to hem or turn a
flange on all edges to eliminate sharp edges on the baffles.
Mount the smaller height baffle on units with a control box
located on the end of the unit. It is recommended that the upper
notches be used for mounting the baffles. This reduces the risk
of damaging the coil while drilling a mounting hole. Loosen
the upper corner post bolts and slide the baffle under the bolt
and washer. Tighten the bolt. Drill holes in the bottom of the
flange of the baffle and mount with two screws to secure the
bottom of the baffle to the corner post. Repeat the process for
the opposite end. See Fig. 30.
WARNING
Disconnect all power to the unit before performing mainte-
nance or service. Electrical shock and personal injury could
result.
CAUTION
To avoid damage to the refrigerant coils and electrical com-
ponents, use extreme care when drilling screw holes and
screwing in fasteners.
Cross break these faces.
Hem these 3 edges both top
and bottom.
See Detail A
1880 [74.0]
Detail A
Typical Both Flanges
X
180 [7.0]
18 [0.75]
31 [1.25]
18 [0.75]
21 [0.88]
70 [2.75]
305 [12.0]
Fig. 30 — Field-Fabricated and Field-Installed Wind Baffles
NOTES:
1. Material: 18 ga. Corrosion Resistant Sheet Metal.
2. Dimensions are in mm [inches].
POSITION
BAFFLE HEIGHT (X)
RIGHT END LEFT END
30XA080-120
(Facing the control box end)
1040 [41.0] 635 [25.0]
30XA140-500
(Facing the control box end)
1040 [41.0] 1040 [41.0]
a30-3997