17
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different se-
quences for the steps of unit installation. For example, on curb-
mounted units, some accessories must be installed on the unit be-
fore the unit is placed on the curb. Review the following for rec-
ommended sequences for installation steps.
CURB-MOUNTED INSTALLATION
1. Install curb
2. Install field-fabricated ductwork inside curb
3. Install accessory thru-base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
4. Prepare bottom condensate drain connection to suit
planned condensate line routing (see Install External Con-
densate Trap and Line on page 30 for details)
5. Rig and place unit
6. Install outdoor air hood
7. Install flue hood
8. Install gas piping
9. Install condensate line trap and piping
10. Make electrical connections
11. Install other accessories
PAD-MOUNTED INSTALLATION
1. Prepare pad and unit supports
2. Check and tighten the bottom condensate drain connection
plug
3. Rig and place unit
4. Convert unit to side duct connection arrangement
5. Install field-fabricated ductwork at unit duct openings
6. Install outdoor air hood
7. Install flue hood
8. Install gas piping
9. Install condensate line trap and piping
10. Make electrical connections
11. 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 trans-
portation agency. Confirm before installation of unit that 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 in Fig. 12-
14. Assemble and install accessory roof curb in accordance with
instructions shipped with the curb. Curb should be level. This is
necessary for unit drain to function properly. Unit leveling toler-
ances are shown in Fig. 11. Refer to Accessory Roof Curb Instal-
lation Instructions for additional information as required.
Fig. 11 — Unit Leveling Tolerances
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. 12-14. Improperly applied gasket can also result in air leaks
and poor unit performance.
Install insulation, cant strips, roofing felt, and counter flashing as
shown. Ductwork must be attached to curb and not to the unit.
FOR SIZES 07-14 ONLY
The accessory thru-the-base power and gas connection package
must be installed before the unit is set on the roof curb. If field-
installed thru-the-roof curb gas connections are desired, use facto-
ry-supplied 1/2-in. pipe coupling and gas plate assembly to mount
the thru-the-roof curb connection to the roof curb. Gas connec-
tions and power connections to the unit must be field installed af-
ter the unit is installed on the roof curb.
If electric and control wiring is to be routed through the basepan,
attach the accessory thru-the-base service connections to the base-
pan in accordance with the accessory installation instructions.
IMPORTANT: If the unit has the factory-installed Thru-
the-base option, make sure to complete installation of the
option before placing the unit on the roof curb.
See the following sections:
Factory-Option Thru-Base Connections
(Gas Connection) on page 27 for sizes 07-14 and page 28
for size 16
Factory-Option Thru-Base Connections
(Electrical Connections) on page 35 for sizes 07-14 and
page 36 for size 16
NOTE: For size 16, if gas and/or electrical connections are
not going to occur at this time, tape or otherwise cover the
fittings so that moisture does not get into the building or
conduit in the interim.
A-B
in. (mm)
B-C
in. (mm)
A-C
in. (mm)
0.5 (13) 1.0 (25) 1.0 (25)
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