Carrier 50EJQ Información técnica descargar pdf (Pagina 3)

• control of one stage of gas or electric heat to maintain supply-

air temperature at supply-air set point during occupied

periods

• ability to use multiple space temperature sensors to aver-

age space temperature

• support linkage function for interface with DAV (Digital

Air Volume) systems

• enable heating or cooling during unoccupied periods as

required

• provide space temperature reset to reset the supply-air set

point upward when temperature falls below its occupied

cooling set point (space temperature sensor is required)

• provide space temperature reset to reset the supply air set

point upward from a remote 4 to 20 mA signal

• provide VFD (variable frequency drive) enable high volt-

age relay output to enable VFD

• control of heat interlock relay

Standard Heat Pump Only Features

• control compressors and reversing valve solenoids as ﬁrst

stage of heating

• control heat stages 1 and 2 as second stage heating or as

emergency heat

• control of both outdoor fans during heating

• provide defrost cycles during heating

Accessory Expansion Board Features

• control of modulating economizer damper to maintain

indoor-air quality when outdoor conditions are suitable

• provide discrete inputs for fan status, ﬁlter status, ﬁeld

applied status, and demand limit

• provide demand limit functions based upon the state of

the discrete input

• provide an output for the external alarm light indicator

• smoke control modes including evacuation, smoke purge,

pressurization, and ﬁre shutdown

• provide power exhaust ﬁre outputs for direct control of

modulated power exhaust stages during ﬁre/smoke modes

INPUTS/OUTPUTS AND

SYSTEM INFORMATION

The DDC board contains the factory-loaded software that

monitors and processes the following inputs, outputs and sys-

tem information:

• INPUTS:

− thermistors

− switches

− remote 4 to 20 mA signal

• OUTPUTS (CV OPERATION):

− condenser fan contactors

− indoor-fan relay

− compressors stages 1 and 2

− crankcase heaters

− heat stages 1 and 2 operation

− economizer motor (4 to 20 mA)

− optional non-modulating power exhaust

− optional modulating power exhaust enable

• OUTPUTS (VAV OPERATION):

− condenser fan contactors

− indoor-fan relay/variable frequency drive enable

− compressors and unloading stages 1 through 6

− crankcase heaters

− heat relay

− heat interlock relay

− economizer motor (4 to 20 mA)

− optional non-modulating power exhaust (Version

3.0 software)

− optional modulating power exhaust enable

• OUTPUTS (HEAT PUMP OPERATION):

− condenser fan contactors

− indoor-fan relay

− compressors stages 1 and 2

− crankcase heaters

− heat stages 1 and 2 operation

− economizer motor (4 to 20 mA)

− optional power exhaust

− reversing valve solenoids

− outputs to Y for defrost

• OUTPUTS (EXPANSION MODULE):

− alarm light

− power exhaust override

− smoke control modes

− IAQ/OAQ (indoor air quality/outdoor air quality) ven-

tilation modes

NOTE: Software resides in non-volatile memory in the DDC;

memory will not be lost with an extended power failure. There

are no batteries to replace over time.

• SYSTEM INFORMATION:

− generates alert and alarm information (via sensor

inputs)

− supports level II communications

− supports digital air volume (DAV) interface (48/

50EK,EY only)

− maintain service history

• ACCESSORY EXPANSION MODULE — The expan-

sion module is a ﬁeld-installed accessory. Through input

and output channels on the module, it supports the sensors

and inputs used for:

− fan status

− ﬁlter status

− ﬁeld applied status

− demand limit

− ﬁre unit shutdown

− ﬁre pressurization

− ﬁre evacuation

− ﬁre smoke purge

− IAQ/OAQ

Base Module — The base unit module closes contacts

to energize the compressors, crankcase heaters, and the evapo-

rator fan motor (CV or heat pump) or enable the variable

frequency drive (VAV). Triacs are used to energize the heat

relays, heat interlock relay (VAV), outdoor fans, compressor

unloaders (VAV), and reversing valve relays (HP), and en-

able the optional power exhaust. A room thermostat or room

sensor, optional outside air enthalpy, outdoor-air thermistor,

supply-air thermistors, and compressor switches (compres-

sor safety circuit) provide inputs to this module. When used

with a room sensor, a remote start/stop input can be used to

override the occupancy schedule.

Expansion Module — On the expansion module, the

triacs are used to turn on an alarm light, jumper the modu-

lating power exhaust sequencers, and force the power ex-

haust motors on when necessary in the ﬁre/smoke mode. An

accessory fan status switch, accessory ﬁlter status switch,

accessory ﬁeld applied status switch, an accessory indoor-

air quality switch, and an accessory outdoor-air quality switch

as well as accessory ﬁre unit shutdown, pressurization, evacu-

ation and smoke purge switches provide input to the expan-

sion module. Demand limit can be provided through a 24-v

input.

Economizer — The DDC controls outputa4to20mA

signal to the actuator in the unit to modulate it as required

by the control algorithm. Damper is a spring-return type to

allow automatic closing of the damper on power loss.

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Carrier 50EJQ Información técnica Pagina 3

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