Carrier 48N Instrukcja Użytkownika Pobierz pdf (Strona 2)

Design flexibility

The 48/50N Series rooftop units with

ComfortLink controls are designed to

meet all customer requirements for

new construction, replacement jobs, or

special applications. The customer can

choose from the following:

• standard or high efficiency options

• standard or high capacity options

• CV, SAV™ or VAV applications

• double wall foam panel construction

with optional Agion

interior

• optional digital scroll compressors

• supply-fan motor sizes from 15 to

100 hp

• open drip proof (ODP) or totally

enclosed fan cooled (TEFC) motors

• up to 4 sizes of natural gas heat with

optional modulating control (48

Series units)

• 3 sizes of electric heat with optional

SCR (silicon controlled rectifier)

control (50 Series units)

• hydronic heat with modulating con-

trol (50 Series units)

• microchannel heat exchanger

(MCHX) condenser coils or e-coated

MCHX condenser coils

• integrated economizer with ultra

low-leak dampers per AMCA (Air

Movement and Control Associa-

tion) Std 500

• modulating power exhaust or return

fan

• optional low outdoor sound configu-

ration

• mixed air and final filter options

including pleated, bag, cartridge and

HEPA (high efficiency particulate

air) types

• Humidi-Mizer

adaptive dehumidifi-

cation system

• optional auxiliary coil section or

blank sections in 4 or 8 ft lengths

Supply/return configurations —

The units may be provided with vertical

or horizontal supply, vertical or hori-

zontal return, in any combination, e.g.,

horizontal supply with vertical return.

Exhaust and return options — Su-

perior space pressure control is provid-

ed by specifying one of the modulating

power exhaust systems. Modulating

power exhaust systems utilize a vari-

able frequency drive (VFD) to control

exhaust fan airflow rates to maintain a

user-established space pressure set

point. The power exhaust options in-

clude high and low static choices with a

wide range of motor horsepower avail-

able. For applications with ducted re-

turns that have significant duct static

pressures an optional return fan and

building pressure control exhaust sys-

tem is available. The return fan pro-

vides a separate fan system dedicated

to overcoming flow losses in the return

duct, thus reducing the total selection

load on the unit's supply fan. The re-

turn fan option includes a VFD which

modulates return fan airflow to match

supply fan airflow and to provide high

exhaust flow rate.

Efficiency/capacity options — The

customer is given the opportunity to

select the unit configuration that most

closely matches the application re-

quirements. Standard efficiency units

offer efficiency levels that exceed

ASHRAE 90.1 requirements and will

meet the needs of many applications.

For the energy conscious customer the

high efficiency units provide efficiency

levels that meet or exceed the Consor-

tium for Energy Efficiency (CEE) Tier 2

specifications. Standard and high ca-

pacity options allow the user to select

the capacity combination most appro-

priate for the application. The ability to

select efficiency and capacity levels will

provide up to four different unit combi-

nations in each unit size. In addition,

all motors are premium efficiency de-

signs and are VFD controlled to opti-

mize energy usage.

Environmentally sound

Carrier's Puron

refrigerant (R-410A)

enables you to make an environmen-

tally responsible decision. Puron refrig-

erant (R-410A) is an HFC refrigerant

that does not contain chlorine that is

damaging to the stratospheric ozone

layer. Puron refrigerant (R-410A) is un-

affected by the Montreal Protocol. Pu-

ron refrigerant (R-410A) is a safe, effi-

cient and environmentally sound refrig-

erant for the future.

Quality and reliability

The unit cabinet is constructed of dou-

ble wall foam panels for the sides, floor

and ceiling of the airside section. The

foam panels provide excellent insulat-

ing properties, structural rigidity and

easily cleaned surfaces. The entire unit

is supported on roll formed high

strength steel base rails. These rails of-

fer a stable base for the rooftop units

various components, e.g., compres-

sors, coils, and side panels. In addition

the continuous rail design provides a

strong lifting platform to allow easy

placement of even the largest units.

Performance

Excellent full and part load efficiencies

are achieved by using multiple scroll

compressors and indoor coils with in-

tertwined dual refrigerant circuits. En-

hanced refrigerant control is achieved

through the use of electronic expan-

sion valves (EXV). This enhanced con-

trol allows maximum utilization of the

Puron refrigerant and contributes to

improved efficiency. The compres-

sors are equipped with crankcase

heaters and protected by electronic

sensors and logic to control minimum

on and off times and reverse rotation.

The refrigerant circuits are both elec-

trically and mechanically independent,

to provide standby capability should

one circuit require service.

Features/Benefits (cont)

Table of contents

Page

Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8,9

Ratings and Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12

Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-23

Options and Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-27

Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-35

Accessory Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36-40

Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41,42

Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44-52

Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53,54

Typical Piping and Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Typical Wiring Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56-70

Guide Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71-92

*Sponsored by ASHRAE (American Society

of Heating, Refrigerating, and Air Condition-

ing Engineers).

†Registered trademark of Schneider Electric.

**Registered trademark of Echelon

corporation.

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