Preinstallation; Rigging; Suspended Units; Service Clearance - Carrier 39LA-25 Installation, Start-Up And Service Instructions Manual

PREINSTALLATION

1. Check items received against packing list. Notify Carrier of
any discrepancy.
2. Refer to Fig. 10 for service area requirements.
3. To transfer unit from truck to storage site, refer to rigging
details in Fig. 11 and section on unit rigging for proper han-
dling. See Tables 1 and 2 for section and component weights.
CAUTION
If a fork lift truck is used, lift only from heavy end of skid.
Minimum recommended fork length is 48 inches.
4. Do not stack unit components or accessories during storage.
Stacking can cause damage or deformation.
5. If unit is to be stored for more than 2 weeks prior to installa-
tion, 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 stationary 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 con-
nections have protective 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 redistribute the bearing
grease and to prevent bearing corrosion.

Rigging

All 39L units can be rigged by means of the lifting brackets on
bottom of unit.
Units are shipped fully assembled. 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 until
ready to install sheave.
Lay rigid temporary protection such as plywood walkways in unit
to prevent damage to insulation or bottom panel during
installation.

Suspended Units

Figure 12 shows overhead suspension of unit using optional
factory-supplied suspension channels.
Each support channel consists of 2 pieces, the smaller of which
fits inside the larger one. This allows the channel to be adjusted to
the required length for installation.
Channels are shipped on top of the unit. The 2 sections of each
channel are shipped one inside the other, and are held in place
during shipping by the panel screws in the top panel.
Hardware required for installation of suspension channels is
shipped in a package inside the fan section.
At least 2 suspension channels are shipped with each fan and coil
unit. One or more extra channels will be supplied depending on
the number of accessories ordered. Be sure to install all the sus-
pension channels shipped with a unit. Refer to 39L Isolator
Mounting (Suspended Unit) certified drawing for details.
To install suspension channels:
1. Remove panel screws to free suspension channels for instal-
lation. Replace screws in top panel.
2. Adjust channel to required length by sliding one channel sec-
tion inside the other. The channel must extend at least 9 in.
but not more than 12 in. beyond the edge of the unit. Set
length of channel by installing factory-supplied bolts through
the overlapping channel sections.
3. Mount unit to suspension channel using factory-supplied nuts
and bolts through 7/16 in. diameter holes in unit lifting
bracket.
4. Install field-supplied suspension rods through 9/16 in. diame-
ter holes provided at outer edges of channel. Be sure hanger
rods are securely fastened in place.

Service Clearance

Provide adequate space for unit service access (fan shaft and coil
removal, filter removal, motor access, damper linkage access, etc.)
as shown in Fig. 10.

Condensate Drain

To prevent excessive build-up of condensate in drain pan, ade-
quate trap clearance must be provided beneath the unit. See Install
Condensate Drain section on page 18 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 iso-
lator manufacturer. The coil piping must be isolated or have a flex-
ible connection to avoid coil header damage because of unit mo-
tion. A flexible connection should be installed at the fan discharge.
Fig. 12 and 13 show isolation location for overhead suspension or
floor mounting of unit.
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