Carrier 50EJQ Technical Information PDF herunterladen (Seite 2)

GENERAL

IMPORTANT: This literature contains controls, op-

eration, and troubleshooting data for 48/50EJ, EK, EW,

EY rooftop units and 50EJQ, EWQ heat pump units.

Use this guide in conjunction with the separate Instal-

lation Instructions literature packaged with the unit.

Carrier Comfort Network (CCN) — Carrier HVAC

(heating ventilation and air conditioning) and other building

equipment being controlled by DDC (direct digital controls)

have the inherent ability to talk on a common communi-

cation bus or network. The conﬁguration of the com-

munication bus with 2 or more DDC controlled pieces of

equipment is referred to as the Carrier Comfort Network (CCN)

system. The CCN communication bus conveys commands,

data, and alarms between all elements, regardless of their

physical locations. The communication bus consists of a ﬁeld-

supplied, shielded, 3-conductor cable connected in daisy-

chain fashion.

The main human interface with the CCN system is the

Service Tool software, although Building Supervisor or

ComfortWorks™ software can also be used.

NOTE: An IBM PC compatible computer equipped with

Carrier controls software is required to connect to the DDC

control.

The Building Supervisor consists of an IBM PC compat-

ible computer equipped with Carrier controls software that

allows it to connect to the communications bus and com-

municate directly with any equipment connected to the

network. An operator working at a PC with Building Su-

pervisor, Service Tool or ComfortWorks software can com-

mand, monitor, conﬁgure, or modify any portion of the sys-

tem. More than one Building Supervisor can be used. The

Building Supervisor, in conjunction with optional network

products, can generate a wide variety of managerial reports

which reﬂect the operational characteristics of one or more

buildings.

NOTE: The DDC board is NOT compatible with the HSIO

used on other products.

DDC Rooftop Information — Precise control is pro-

vided for stand-alone operation of HVAC equipment by a

factory-installed processor. Carrier 48/50EJ,EK,EW,EY and

50EJQ,EWQ units contain factory-installed Direct Digital

Controls (DDC) integrated into the product. The standard

product includes a base module board as well as an acces-

sory expansion module board. The unit is CCN compatible

with both the base module board and the expansion module

board. The optional expansion module board is not required

for CCN compatibility. Sensors that monitor equipment

operation and conditions in the occupied space are con-

nected to the standard processor board in the unit, and out-

puts from the processor board serve to control unit opera-

tion. Each DDC equipped unit is shipped from the factory

with all applicable control hardware and software installed

and ready for start-up.

The DDC rooftop controls cycle evaporator-fan motor, com-

pressors, and unloaders to maintain the proper temperature

conditions. The controls also cycle condenser fans to main-

tain suitable head pressure. Safeties are continuously moni-

tored to prevent the unit from operating under abnormal

conditions. The controls cycle heat as required, provide con-

trol of economizer and power exhaust, and initiate the vari-

able frequency drive.

A scheduling function, programmed by the user, controls

the unit occupied/unoccupied schedule. The control can also

be in the unoccupied schedule and put into the occupied sched-

ule through a remote 24-v AC signal. The DDC control also

allows the service person to operate a ﬁeld test so that all the

base unit controlled components can be checked for proper

operation. The ﬁeld test can be performed without the aid of

a personal computer and Building Supervisor, Service Tool

or ComfortWorks software.

Major Control Components — The control system

consists of the following components:

• standard base module board

• accessory expansion module board

• accessory enthalpy sensor

• thermistors

• space temperature sensors (accessory T-55, T-56)

• accessory supply-air fan status switch

• accessory check ﬁlter switch

• accessory air quality (AQ) sensor (used either indoors or

outdoors)

• accessory 2-stage heat/2-stage cool room thermostat

FEATURES

Standard Features

• control of an outdoor (condenser) fan based upon outdoor-

air temperature

• control of modulating economizer damper to provide free

cooling when outdoor conditions are suitable, using supply-

air temperature (SAT) as a control point

• support of remote occupied/unoccupied input to start/stop

the unit

• control of the economizer damper and indoor fan to obtain

unoccupied free cooling

• control of 2 stages of CV (constant volume) power

exhaust

• provide power exhaust output to an external power ex-

haust controller

• perform demand limit functions based upon CCN load-

shed commands

• alarm monitoring of all key parameters

• CCN protocol

• timeclock with backup (supports hour, minute, day of week,

month, date, and year)

• daylight savings time function

• occupancy control with 8 periods for unit operation

• holiday table containing up to 18 holidays

• ability to initiate timed override from T-55 device

• support a factory- and ﬁeld-test for end of line production

and ﬁeld check out

• temperature compensated start to calculate early start time

before occupancy

• support a set of Display, Maintenance, Conﬁguration, Serv-

ice, and Set Point data tables for interface with Building

Supervisor, Service Tool or ComfortWorks software

Standard CV (Constant Volume) Only Features

• control using Y1, Y2, W1, W2, G thermostat inputs

• cooling capacity control of 2 stages plus economizer with

2 compressors to maintain space temperature to an occu-

pied or unoccupied set point

• control of up to 2 stages of gas or electric heat to maintain

space temperature to an occupied or unoccupied set point

• enable heating or cooling during unoccupied periods as

required to maintain space temperature within the unoc-

cupied set points

• ability to initiate timed override from T-56 device

• control of the indoor fan

• adjustment of space temperature set points ±5° F when

using T-56 sensor

Standard VAV (Variable Air Volume) Only

Features

• cooling capacity control of 6 stages plus economizer with

2 compressors and 2 unloaders to maintain supply-air

temperature at supply-air set point during occupied

periods

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