Carrier 42S Series Manuale Utente Scaricare il pdf (Pagina 44)

43

Carrie

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39F

Options

A. CASING

1. Galvanized and painted steel roofing

The roof sheets are cross-braked for added

stiffness and to facilitate water runoff and are

overhung on all sides.

Slip joints assure water tightness between

adjacent sheet.

2. Sub base 100 mm high, galvanized and

painted

39F unit sections are self supporting and do

not rely on a base for additional stiffening.

However, bases are sometimes required to

provide sufficient height for a U-trap below

the cooling coil drain pan or to raise units from

roof slab in external locations.

3. Air inlet hood

In galvanized, painted sheet metal sized and

sloped to avoid water entrapment.

A fine wiremesh bird screen is provided.

4.

Air discharge hood

In galvanized, painted sheet metal, designed to

prevent ingress of water.

A fine wiremesh bird screen is provided.

5. Flexible connections

For specifications calling for total unit to be

vibration isolated.

In fabric non-flammable class M1 with

connecting flanges in galvanized painted steel.

Can be installed on suction and / or discharge

side.

6. Bulkhead light

75 watts light bulb under glass cover, with

switch and a connection box all to IP 55.

Wiring upon request.

7. Inspection window

In strong plexiglass, 180 mm dia.

Together with bulkhead light allows quick

inspection of the inside of the casing while unit

is in operation.

B. FILTERS

1. Pressure control

U-tube pressure gauge 0 to 500 Pa.

Inclined tube pressure gauge 0 to 500 Pa.

Furnished for field installation. The pressure

connection tappings are factory installed.

Differential air pressure switch adjustable from

10 to 1250 Pa.

2. Air diffusion screen

For filters installed downstream from the fan

discharge and to assure a uniform air

distribution.

C. HUMIDIFIERS

1. Support feet

In galvanized painted sheet metal, 315 mm

high, to compensate for the added height due

to the humidifier sump. These feet are to be

placed under the edges of all other sections.

2. Inspection light

In cast iron and glass, to IP 55

D. FANS

1. Variable volume control

For variable volume systems: Inlet guide vanes

(for backward curved fans) or variable speed

motors (eddy current coupling, or frequency

inverter control) are available.

2. Fan drain

This connection is located on the bottom of the

fan volute and serves to drain any

condensation which might form on the inside

of the fan.

3. Inspection door

Available on all fan sizes, serves as access to

the fans for interior inspection and cleaning of

the volute and the fan impeller.

E. MOTOR

1. Vee belt guard

Made of galvanized expended steel.

2. Variable pitch pulleys

Can be installed on the motor shaft and / or the

fan shaft to allow fan speed variation between

+ or –20% for one variable pulley and + or –

50% for a pair of variable pitch pulleys. This

system is limited to maximum two grooves at

the pulley and the motor power of maximum

5.5 kW. Adjustment can only be made

manually and when the fan is stationary.

3. Standby motor

Situated opposite to the run motor and

furnished with a set of belts and pulley (belts

not fitted).

F. EXPLOSION PROOF CONSTRUCTION

Applied where the possibility of flammable

gasses exist. Flameproof motors and switches

and fan non-spark rings can be provided. The

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