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Mechanical Installation
Installer Responsibilities
CAUTION
Sharp edges on sheet metal and fasteners can cause personal injury. This
equipment must be installed, operated, and serviced only by an experienced
installation company and fully trained personnel.
The installation of this equipment shall be in accordance
with the regulations of authorities having jurisdiction and all
applicable codes. It is the responsibility of the installer to
determine and follow the applicable codes.
Receiving Inspection
When the equipment is received, all items should be carefully
checked against the bill of lading to be sure all crates and
cartons have been received.
If the unit has become dirty
during shipment (winter road chemicals are of particular
concern), clean it when received.
All units should be carefully inspected for damage when
received. Report all shipping damage to the carrier and file a
claim. In most cases, equipment is shipped F.O.B. factory and
claims for freight damage should be filed by the consignee.
Before unloading the unit, check the unit nameplate to make
sure the voltage complies with the power supply available.
Service Clearance
CAUTION
Location .
Care should be taken for the installation location to minimize
snow drifts on the outdoor coil.
Allow service clearances as approximately indicated in
. Also, Daikin recommends providing a roof walkway to the
rooftop unit as well as along each side of the unit that provides
access to most controls and serviceable components.
Refer to NEC and local code for minimum clearances around
the unit and control panel.
Reasons for clearance:
1 .
Door swings – all hinged access doors need space to
freely swing to accommodate standard service, such as
filter replacement
2 .
Components pulls – on the off chance a component such
as an energy recovery wheel fails, space to the side of
the unit to allow for full removal will be required
3 .
Condenser flow – packaged equipment reject heat via
proper airflow pulled across the condenser coil. If airflow
is restricted, the unit may not operate properly
4 .
Air recirculation – whether it is the building exhaust or
gas burner flue, there is a required clearance to allow
those undesired airstreams from approaching the
outdoor intake
5 .
Pertinent codes – whether it is an electrical or other
code, many municipalities dictate minimum clearances
around powered devices.
Ventilation Clearance
Below are minimum ventilation clearance recommendations.
The system designer must consider each application and
provide adequate ventilation. If this is not done, the unit may
not perform properly .
Unit(s) Surrounded by a Screen or a Fence:
1 .
The bottom of the screen or fence should be at least 1 ft.
(305 mm) above the roof surface.
2 .
The distance between the unit and a screen or fence
3 .
The distance between any two units within a screen or
fence should be at least 120" (3048 mm).
Unit(s) Surrounded by Solid Walls:
1 .
If there are walls on one or two adjacent sides of the unit,
the walls may be any height. If there are walls on more
than two adjacent sides of the unit, the walls should not
be higher than the unit.
2 .
The distance between the unit and the wall should be at
least 96" (2438 mm) on all sides of the unit.
3 .
The distance between any two units within the walls
should be at least 120" (3048 mm).
Do not locate outside air intakes near sources of contaminated air.
If the unit is installed where windy conditions are common,
install wind screens around the unit, maintaining the
clearances specified (see
). This is particularly
important to maintain adequate head pressure control when
mechanical cooling is required at low outdoor air temperatures.
Overhead Clearance
1 .
Unit(s) surrounded by screens or solid walls must have
no overhead obstructions over any part of the unit. For
heat pump models overhead obstructions could allow the
formation of dangerous icicles.
2 .
The area above the condenser must be unobstructed in
all installations to allow vertical air discharge.
3 .
The following restrictions must be observed for overhead
obstructions above the air handler section:
a .
There must be no overhead obstructions above the
furnace flue, or within 9" (229 mm) of the flue box.
b .
Overhead obstructions must be no less than 96"
(2438 mm) above the top of the unit.
c. There must be no overhead obstructions in the areas
above the outside air and exhaust dampers that are
farther than 24" (610 mm) from the side of the unit.
IM-1125-13 • REBEL ROOFTOPS
4
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Mechanical Installation