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INSTALLATION
Inspect unit for transportation dmnage. If &_mage is found,
file claim with transportation agency.
Step 1 -- Provide Unit Support
ROOF CURB -- Assemble and install accessory roof curb or
horizont_d a&tpter roof curb in accordance with instructions
shipped with this accessory. See Fig. 1 and 2. Install insulation,
cant strips, roofing, and counter flashing as shown. Ductwork
can be installed to roof curb or horizontal adapter roof curb be-
fore unit is set in place. Curb or a&tpter roof curb should be
level. This is necessary to permit unit drain to function proper-
ly. Unit leveling tolerance is + l/l(_ in. per linear fl in any direc-
tion. Refer to Accessory Roof Curb or Horizontal A&_pter
Roof Curb Installation Instructions for additional information
as required. When accessory roof curb or horizontal adapter
roof curb is used, unit may be installed on class A, B, or C roof
covering material.
IMPORTANT: The gasketing of the unit to the roof curb
or adapter roof curb is critical for a watertight se_d.
Inst_fll gasket with the roof curb or adapter as shown in
Fig. 2. Improperly applied gasket can _dso result in air
leaks and poor unit performance.
ALTERNATE UNIT SUPPORT -- When the curb or adapter
cannot be used, install unit on a noncombustible surface. Sup-
port unit with sleepers, using unit curb support area. If sleepers
cannot be used, support long sides of unit with a minimum of 3
equally spaced 4-in. x 4-in. pads on each side.
Step 2 -- Rig and Place Unit -- Do not diop unit;
keep upright. Use spreader bras over unit to prevent sling or
cable &image. Rollers may be used to move unit across a roof.
Level by using unit frame as a refelence; leveling tolerance is
_+1/1_in. per linear fl in any direction. See Fig. 3 for additiomfl
information. Unit operating weight is shown in Table 1.
Four lifting holes are provided in ends of unit base rails as
shown in Fig. 3. Refer to rigging instructions on unit.
POSITIONING- Maintain clearance, per Fig. 4 and 5,
around and above unit to provide minimum distance from
combustible materials, proper airflow, and service access.
Do not install unit in an indoor location. Do not locate unit
air inlets near exhaust vents or other sources of contmninated
all: For proper unit operation, adequate combustion and venti-
lation air must be provided in accordance with Section 5.3 (Air
for Combustion and Ventilation) of the National Fuel Gas
Code, ANSI Z223.1 (American National Stan&_rds Institute).
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Ix)cate mechanical diaft system flue assembly at least 4 ft
from any opening through which combustion products could
enter the building, and at least 4 ft from any adjacent building.
When unit is located adjacent to public walkways, flue assem-
bly must be at least 7 ft above grade.
ROOF MOUNT-- Check building codes for weight distri-
bution requirements. Unit operating weight is shown in
Table 1.
hlstructions continued on page 9.
14-3/4_
NOTE: CRRFCURB013A00 is a fully factory preassembled hori-
zontal adapter and includes an insulated transition duct. The pres-
sure drop through the adapter curb is negligible.
For horizontal return applications: The power exhaust and baro-
metric relief dampers must be installed in the return air duct.
25% VENT AIR//
ECONOMIZER
HOOD
BLOCK-OFFJ___ i
PAN
A,R
OUT
HORIZONTALSUPPLY/
CURB (CRRFCURB013A00)
I
TRANSITION DUCT
FULLY INSULATED
SUPPLY PLENUM
1 1/2 # DENSITY,
STICK PINNED & GLUED
12" WIDE STANDING--
SEAM PANELS
ACCESSORY CURB
PACKAGE NO. HEIGHT
1'-11"
CRRFCURB013A00 (584
DESCRIPTION
Pre-Assembled, Roof Curb,
Horizontal Adapter
Fig. 1 -- Horizontal Supply/Return Adapter Installation