8
Specifications subject to change without notice.
516 01 3604 04
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb or
other) that provides for the minimum clearances required for
safety (including clearance to combustible surfaces), unit
performance and service access below, around and above
unit as specified in unit drawings. See Fig. 3.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood flooring or on Class
A, B, or C roof-covering material when roof curb is used.
Do not install unit in an indoor location. Do not locate air in
-
lets near exhaust vents or other sources of contaminated
air.
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto
unit.
Select a unit mounting system that provides adequate
height to allow installation of condensate trap per require
-
ments. Refer to Step 9 — Install External Condensate Trap
and Line on page 14 for required trap dimensions.
ROOF MOUNT
Check building codes for weight distribution requirements.
Unit operating weight is shown in Table 5.
Table 5 — Operating Weights
Step 2 — Plan for Unit InstallationSequence
The support method used for this unit will dictate different
sequences for the steps of unit installation. For example, on
curb-mounted units, some accessories must be installed on
the unit before the unit is placed on the curb. Review the fol
-
lowing for recommended sequences for installation steps.
CURB-MOUNTED INSTALLATION
1. Install curb.
2. Install field-fabricated ductwork inside curb.
3. Install accessory thru-base service connection pack
-
age (affects curb and unit) (refer to accessory instal
-
lation instructions for details).
4. Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 10 —
Install External Condensate Trap and Line on page
14 for details).
5. Rig and place unit.
6. Install outdoor air hood.
7. Install condensate line trap and piping.
8. Make electrical connections.
9. Install other accessories.
PAD-MOUNTED INSTALLATION
1. Prepare pad and unit supports.
2. Check and tighten the bottom condensate drain con
-
nection 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 condensate line trap and piping.
8. Make electrical connections.
9. Install other accessories.
FRAME-MOUNTED INSTALLATION
Frame-mounted applications generally follow the sequence
for a curb installation. Adapt the sequence as required to
suit specific installation plan.
Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim with
transportation agency.
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data plate
agree with power supply provided.
On units with hinged panel option, check to be sure all latch
-
es are snug and in closed position.
Locate the carton containing the outside air hood parts. Do
not remove carton until unit has been rigged and located in
final position.
Step 4 — Provide Unit Support
ROOF CURB MOUNT
Accessory roof curb details and dimensions are shown in
Fig. 6. Assemble and install accessory roof curb in accor
-
dance with instructions shipped with the curb.
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are shown in
Fig. 7. Refer to Accessory Roof Curb Installation Instruc
-
tions for additional information as required.
Install insulation, cant strips, roofing felt, and counter flash
-
ing as shown.
Ductwork must be attached to curb and not to
the unit. The accessory thru-the-base power connection
package must be installed before the unit is set on the roof
curb.
If electric and control wiring is to be routed through the
basepan, attach the accessory thru-the-base service con
-
nections to the basepan in accordance with the accessory
installation instructions.
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. 6. Improperly applied gasket can also
result in air leaks and poor unit performance.
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 condenser 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 with a minimum of 3 equally spaced
4-in. x 4
-
in. (102 mm x 102 mm) pads on each side.
RHH120
COMPONENT
UNIT LB (KG)
Base Unit
1390 (632)
Economizer
Vertical
100 (45)
Horizontal
115 (52)
Powered Outlet
32 (15)
Curb
14 in. (356 mm)
180 (82)
24 in. (610 mm)
235 (107)
