18
PREINSTALLATION
1. Check items received against packing list.
2. Do not stack unit components or accessories during stor-
age. Stacking can cause damage or deformation.
3. If unit is to be stored for more than 2 weeks prior to in-
stallation, observe the following precautions:
a. Choose a dry storage site that is reasonably level
and sturdy to prevent undue stress or permanent
damage to the unit structure or components. Do not
store unit on vibrating surface. Damage to station-
ary bearings can occur. Set unit off ground if in
heavy rain area.
b. Remove all fasteners and other small parts from
jobsite to minimize theft. Tag and store parts in a
safe place until needed.
c. Cover entire unit with a tarp or plastic coverall.
Extend cover under unit if stored on ground.
Secure cover with adequate tiedowns or store
indoors. Be sure all coil connections have protec-
tive shipping caps.
d. Monthly — Remove tarp from unit, enter fan
section through access door or through fan inlet,
and rotate fan and motor slowly by hand to redis-
tribute the bearing grease and to prevent bearing
corrosion.
Rigging —
Do not remove shipping skids or protective
covering until unit is ready for final placement. Use slings and
spreader bars as applicable to lift unit.
Do not lift unit by coil
connections or headers.
Do not remove protective caps from coil piping connections
until ready to connect piping.
Do not remove protective cover or grease from fan shaft un-
til ready to install sheave.
Lay rigid temporary protection such as plywood walkways
in unit to prevent damage to insulation or bottom panel during
installation.
Shipping Bolt and Screw Removal (36SH
Unit) —
On 39SH units ensure that all red shipping bolts
and screws are removed and all other bolts and screws are
tight. The red hold-down shipping bolts are located on both
sides of the blower/motor mounting rails and are accessible
through the side access panels. The red sheet metal screws are
located on the discharge duct collar. All red bolts and screws
must be removed for the blower assembly to be isolated from
the cabinet. See Fig. 14.
Unit Suspension (39SH and 39SM Units) —
Acceptable forms of unit suspension are shown in Fig. 15. A
field-supplied platform mount is recommended, especially for
larger unit sizes. Units can also be supported by suspending the
unit from crossbeams at the joint between each unit compo-
nent. Since the 39SM units lack a baserail, support members
should also be placed along the airway length of the unit in
order to prevent buckling. Ensure that suspension rods are
secured to adequately support the unit and that the rods extend
entirely through their associated fasteners.
All 39SH units have
7
/
8
in. knockouts in each corner of their
top and base panels for suspension rods to pass through, locat-
ed 3
1
/
2
in. in from the corners on the center line. It is recom-
mended that an angle iron or Unistrut framing system be used
under the unit for support (these support pieces should extend
approximately 1 in. beyond each end of the unit width).
NOTE: Locate suspension rods so they do not block access
panels or interfere with the electrical, mechanical, or drain
functions of unit.
Service Clearance —
Provide adequate space for unit
service access (fan shaft and coil removal, filter removal, mo-
tor access, damper linkage access, etc.)
Condensate Drain —
To prevent excessive build-up of
condensate in drain pan, adequate trap clearance (trap depth)
must be provided beneath the unit as indicated in Fig. 16. See
Installation, Condensate Drain section for additional details.
External Vibration Isolators —
Install vibration
isolators per certified drawings, and in accordance with the job
specifications and the instructions of the vibration isolator
manufacturer. The coil piping must be isolated or have a flexi-
ble connection to avoid coil header damage because of unit
motion. A flexible connection should be installed at the fan
discharge.
Figure 15 shows isolation locations for overhead suspension
of unit.
Fig. 14 — Shipping Bolt and Screw Removal
a39-4086
a39-4087
