Mechanical Installation; Installer Responsibilities; Receiving Inspection; Ventilation Clearance - Daikin Rebel DPS Series Installation And Maintenance Manual

Commercial packaged rooftop systems

Table of Contents

Installer Responsibilities

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

Location . Care should be taken for the installation location to minimize

snow drifts on the outdoor coil.

Allow service clearances as approximately indicated in

1. 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.

IM-1125-13 • REBEL ROOFTOPS

CAUTION

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

should be as described in

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

important to maintain adequate head pressure control when

mechanical cooling is required at low outdoor air temperatures.

Overhead Clearance

Figure

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.