Installation manual

Page 20 IM-487
Reassembly of Split Units
Field reassembly of a unit shipped split at the fan takes place
in two places:
1. Setting the sections and mechanically recoupling
the cabinet.
2. Reconnecting power and control wiring if optional power
pack and/or controls are used.
Setting the Sections and Cabinet Reassembly
Steps 1 to 5 describe what is required to set the unit and reas-
semble the cabinet. Note also the following items:
• Top cap and plywood covers must be removed before the
sections are set together, but the steel retainer clips must
be left in place to secure the bulkhead. Refer to Step #1
and Figure 20.
• Both sections must be lowered into place carefully to
make sure that the roof curb engages the recesses in the
unit base.
• All seams at the split must be caulked watertight after
recoupling the sections, as shown in Step #3 and
Figure 21 on page 21.
Reconnecting Power and Control Wiring
(Units With Optional Factory Wiring)
The discharge sections contain power and control harnesses
which have their excess length in the blank or heat section
that is normally immediately downstream of the fan. Once
the sections are physically reconnected, the ends of the
power harness are fed back through the unit base into the
junction box, per the unit's electrical schematics.
After the power wires are reconnected, the inner raceway
cover in the blank or heat section must be reinstalled. Step 4
of Figure 22 on page 21 shows a typical installation of a
raceway cover.
Run control harnesses by removing the external raceway
covers on either side of the unit. Excess harness may be
removed from the external raceway on the discharge side of
the split, routed along the raceway through the brushed hole
in the fan section, and into the junction box where control
wiring terminal blocks are provided for reconnection. Make
electrical connections using the unit’s electrical schematics.
Reinstall the external raceway covers after the control wires
are routed.
Step 1.
Prepare units for reassembly as shown in Figure 20.
Step 2.
Set fan end of unit and discharge end of unit in place.
Figure 20. Reassembly of Split Unit - Step 1
WARNING
Connect the power block correctly and maintain
proper phasing.
Improper installation can cause severe equipment dam-
age, personal injury or death.
Remove top cap and
save for step 3
Remove plywood and retaining
angles from unit and discard
Discharge end of Unit
Fan end of Unit
Remove screws on fan panel, but
leave retainer clips in place;
save screws for Step 3.