Data Aire DAFC-11 Spezifikationen PDF herunterladen (Seite 11)

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1” Pre-Filter - Units may be ordered with a one inch pre-ﬁ lter.

Pump Package - Centrifugal pump packages are available to

circulate water or water/glycol solution. Pumps are available

in various horsepower and voltage. Both 3400 and 1750 rpm

pumps are available as an option. Pumps ship loose or come

mounted in an optional pump enclosure. It is recommended on

units with dual pump applications that a 3-way water regulating

valve be used in lieu of the standard 2-way valve.

Pump Auto-Changeover - Dual pump packages may be provided

with a pump auto-changeover control and NEMA 4 ﬂ ow switch

(ﬁ eld installed). The pump auto-changeover control is factory

wired and mounted in the dry cooler control box. The pump au-

to-changeover control provides automatic pump changeover in

the event of a pump failure. Upon pump changeover, an audible

alarm will sound at the indoor unit and a message (“STANDBY

PUMP ON: CHECK PRIMARY PUMP”) will be displayed on

the unit microprocessor display.

Hot Gas Bypass - Hot gas bypass may be ordered for changing

load conditions. The hot gas bypass valve is installed between

the compressor discharge line and the leaving side of the expan-

sion valve through a side outlet distributor. The system with the

evaporator under full load will maintain pressure on the leaving

side of the hot gas bypass valve to keep the valve port closed.

Should the load on the evaporator decrease to the point where

the coil is below the desired setting, the pressure on the dis-

charge of the hot gas bypass will put pressure on the diaphragm

overcoming the spring pressure of the seat and allowing some

hot gas to mix with the normal liquid discharge of the expansion

valve raising the evaporator pressure. This reduces the cooling

capacity of the unit to match the load. The hot gas bypass valve

can be adjusted to “ﬁ ne tune” the unit to room conditions.

Pump Enclosures - Pump enclosures are available for either

single or dual pump applications*. Pump enclosures are vented

and weather resistant. When ordered with pumps, the pumps

are factory mounted in the enclosure ready for ﬁ eld piping and

wiring. (* Due to the size of some pumps, a special oversized

enclosure can be made available.)

Integral Pump Enclosures - Pumps may be factory mounted as

an integral part of the dry cooler. A 30” extension is added to

the dry cooler. Pumps are pre-piped and wired. Shut-off valves

and ﬂ ow switches are included. This conﬁ guration greatly re-

duces ﬁ eld installation procedures.

Extended Compressor Warranty - Extended compressor war-

ranty is available from the manufacturer in addition to the stan-

dard warranty. The warranty is for replacement of compressors

and does not include labor. Contact you local representative for

period of coverage.

Remote Temperature and Humidity Sensors - Tempera-

ture and humidity sensors may be ordered for remote wall

mounting. Sensors are provided in a wall mount plastic case

for remote sensing of temperature and humidity. 25 feet of

shielded cable is provided for ﬁ eld wiring.

Smoke Detector - A unit mounted smoke detector will

shut down the unit if smoke is sensed. The unit mounted

microprocessor will sound an alarm and display “SMOKE

DETECTOR: UNIT SHUTDOWN” message. The smoke

detector is mounted in the return air stream and is provided

with auxiliary contacts.

Unit Mounted Disconnect - A unit mounted non-automatic

disconnect switch is installed in the high voltage electrical

section. The operating mechanism prevents access to the

high voltage electrical components until switched to the

“OFF” position. The operating mechanism (handle) pro-

trudes through the decorative door.

Steam Generator Humidiﬁ er with Modulating Control -

Modulating control may be added to the steam generator

humidiﬁ er. Modulating control will allow the humidiﬁ er to

automatically adjust steam output to match changing room

conditions. Self-regulating auto ﬂ ush is included.

3-Way Water Regulating Valve - A 3-way water regulating

valve for head pressure control may be ordered to replace

standard 2-way valve installed in unit. The 3-way valve

controls the water/glycol ﬂ ow rate to meet the heat rejection

requirements under varying conditions. Recommended on

units with dual pump applications.

Condensate Pump - Condensate pumps may be ordered as

factory installed or for ﬁ eld installation. Condensate pumps

are complete with sump, motor, and automatic control. The

pumps are rated for 130 GPH @ 20 ft maximum or 40 GPH

@ 20 feet with check valve. Pumps shipped loose are avail-

able in 115, 230, or 460 volt. If unit mounted and wired,

the pump will match the unit voltage. Not available in 575

volt.

Upﬂ ow Plenum - Upﬂ ow plenums are fully insulated and

have front discharge air grille. Side grilles for both or one

side are available. Plenums are 18 inches high and are

painted to match the unit color.

Floorstand - Floorstands are adjustable +/- 2 inches and

may be ordered with a factory installed turning vane or with

seismic construction.

60% Efﬁ cient Filter - The standard 30% efﬁ cient ﬁ lter may

be replaced with 60% efﬁ cient ﬁ lter (based on ASHRAE

Std. 52.1-1992). Filters are 4 inch deep, pleated type.

(Note: Higher efﬁ ciency ﬁ lters are available - consult facto-

ry regarding efﬁ ciency percentage and unit static pressures)

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