IMPORTANT: Units have high ambient operating limits. If [
limits are exceeded, the units will automatically lock the
I
compressor out of operation. Manual reset will be required
to restart the compressor:
INSTALLATION
Step 1 -- Plan for Unit Location -- Select a loca-
tion for the unit and its support system (curb or other) that
provides minimum clearances required for safety, unit perfor-
mance and service access below, around and above unit as
specified in unit drawings. Consider also the effect of adjacent
units.
Do not install unit in an indoor location. Do not locate ;dr
inlets near exhaust vents or other sources of contaminated air.
For proper unit operation, adequate combustion and ventilation
air must be provided in accordance with Section 5.3 (Air for
Combustion and Ventilation) of the National Fuel Gas Code,
ANSI Z223A (American Natiomd Stan&u_ds Institute). Al-
though unit is weatherproof, guard against water from higher
level runoff and overhangs.
I_cate mechanical &_afl system flue assembly at least 4 ft
fi_om any opening through which combustion products could
enter the building, and at least 4 fl fi_)m any adjacent building
(or per local code). Locate the flue assembly at least 10 fl (or
per local code) from an adjacent unit's fi_esh air intake hood if
within 3 ft of stone elevation. When unit is located adjacent to
public w;dkways, flue assembly must be at least 7 fl above
grade.
Select a unit mounting system that provides adequate height
to allow installation of condensate trap per requirements. Refer
to Step 7 -- Install External Trap for Condensate Drain for re-
quired trap dimensions.
ROOF MOUNT -- Check building codes for weight distribu-
tion requirements. Unit operating weight is shown in Table 1.
Step 2 -- Provide Unit Support
ROOF CURB -- Asselnble or install accessory roof curb in
accordance with instructions shipped with this accessory. See
Fig. 1. Install insulation, cant strips, roofing, and counter flash-
ing as shown. DuctwoN can be inst_dled to roof curb before unit
is set in place. DuctwoN must be attached to curb and not to the
unit. Curb must be level. This is necessary to permit unit drain to
limction properly. Unit leveling tolerance is _+J/l_ in. per linem
1l in any direction. Refer to Accessory Roof Curb Installation
Instructions for additional information as required. When acces-
sory roof curb is used, unit may be installed on class A, B, or C
roof covering material. C_urier roof curb accessories are for flat
roofs or slab mounting.
IMPORTANT: The gasketing of the unit to the roof curb is
critical for a watertight seal. Install gasket with the roof
curb as shown in Fig. 1. Improperly applied gasket can also
result in air leaks and poor unit performance. Do not slide
unit to position on roof curb.
ALTERNATE UNIT SUPPORT- When a curb cannot be
used, inst_dl unit on a noncombustible surface. Support unit
with sleepers, using unit curb support area. If sleepers cannot
be used, support long sides of unit with a minimum of 3 equal-
ly spaced 4-in. x 4-in. pads on each side.
Step 3 -- Rig and Place Unit -- Inspectunit for trans-
portationdmnage. See Table 1 for physical &_ta. File any claim
with transportation agency.
All panels must be in place when rigging. Damage to unit
may result.
Do not di'op unit; keep upright. Use spreader baLs over unit
to prevent sling or cable damage. Rollers may be used to move
unit across a roof. Level by using unit rail as a refelence; level-
ing tolerance is _+ 1/16 in. per linear ft in any direction. See
Fig. 2 for additional information. Unit rigging weight is shown
in Fig. 2.
Rigging holes are provided in the unit base rails as shown in
Fig. 2. Refer to rigging instructions on unit.
INSTALLATION ONTO CURB -- The 48PG units gue de-
signed to fit on the accessory full perimeter curb. Correct
placement of the unit onto the curb is critical to operating per-
formance. To aid in correct positioning, place unit on roof curb
to maintain l/4-in, gap between the inside of rail and roof curb
on long sides and a l/2-in, gap between the inside of rail grad
roof curb on both duct and condenser ends. Refer to Fig. 1 and
3, to assure proper duct opening alignment.
NOTE: Before positioning unit onto curb, refer to Step 7 --
Install External Trap for Condensate Drain on page 8 for
cle_uances.
Do not slide unit to position it when it is sitting on the curb.
Curb gasketing material may be &imaged and leaks may
result.
SLAB MOUNT (Horizontal Units Only) -- Provide a level
concrete slab that extends a minimum of 6-in. beyond unit cab-
inet. Install a grovel apron in front of condenser-coil air inlet to
prevent gross and foliage from obstructing airflow.
NOTE: Horizont_d units may be inst_flled on a roof curb if
required.
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