5
Roof mount —
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different
sequence s for the steps of uni t installat ion. For example,
on curb--mounted units, some accessories must be
installed on the unit before the unit is placed on the curb.
Revie w the following for recommended sequences for
installation steps.
Curb--mounted installation —
Install curb
Install field--fabricated ductwork inside curb
Install accessory thru--base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
Prepare bottom condensa te drain connection to suit
planned condensa te li ne routing (refer to Step 9 for
details)
Rig and place uni t
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Pad--mounted installation —
Prepare pad and unit supports
Check and tighten the bottom condensate drain
connection plug
Rig and place uni t
Convert unit to side duct connection arra ngement
Install field--fabricated ductwork at unit duct openings
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Frame--mounted installation —
Frame--mounted applications generally follow the
sequence for a curb installation. Adapt as required to
suit specific installation plan.
Step 3 — Inspect unit
Inspect unit for transportation damage. File any claim
with transportation agency.
Confirm before install ation of unit t hat voltage, amperage
and circuit protection requirements listed on unit data
plate agree with power supply provided.
Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown i n
Fig. 3. Assemble and install accessory roof curb in
accordance with instructions shipped with the curb.
NOTE: The gasketing of the unit to the roof curb is
critical for a watertight seal. Install gasket supplied with
the roof curb as shown in Fig. 3. Improperly applied
gasket can also result in air leaks and poor unit
performance.
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are show in
Fig. 4. Refer to Accessory Roof Curb Installati on
Instructions for additional informa tion as requi red.
Install insulation, cant strips, roofing felt, and counter
flashing as shown. Du ctwork m us t be attached to cur b a nd
not to the unit. The accessory thru--the--base power package
must be installed befor e the unit is set on the r oof curb.
If electric and control wiring is to be routed through the
basepan, attach the accessory thru--the --base service
connections to the basepan in accordance with the
accessory installation instructions.
Slab Mount (Horizontal Units Only) —
Provide a level concrete slab that extends a minimum of
6 in. (150 mm) beyond unit cabinet. Install a gravel apron
in front of c ondenser coil air inlet to prevent grass and
foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb
if required.
Alternate Unit Support (In Lieu of Curb or Slab
Mount) —
A non--combustible sleeper rail can be used in the unit curb
support area. If sleeper rails cannot be used, support the long
sides of the unit w ith a minimum of 3 equally s paced 4--in. x
4--in. (102 mm x 102 mm) pads on each side.
Table 1 – Operating W eights
50TCQA UNITS LB (KG)
Component A04 A05 A06 A07
Base Unit 505 (229) 510 (231) 590 (268) 630 (286)
Economizer
Vertical 80 (36) 80 (36) 80 (36) 80 (36)
Horizontal 105 (48) 105 (48) 105 (48) 105 (48)
Powered Outlet 32 (15) 32 (15) 32 (15) 32 (15)
Curb
14---in/356 mm 110 (50) 110 (50) 110 (50) 110 (50)
24---in/610 mm 145 (66) 145 (66) 145 (66) 145 (66)
50TCQA
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