Manual Carrier 48 50PM C16-28 (page 19 of 188) (English)

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Space Sensor Control

Space sensor staging control is an adaptive anticipation control that

weighs the actual space demand against the trend of that demand

and the trend of the supply air. It also honors stage time guards

and supply air limits. The demand for cooling in the space is

displayed as the Cooling Demand (Run Status→COOL

→DMD.C). The control tries to anticipate the change in the space

because of its current stage status. This anticipation is based on the

Supply−Air Trend (Operating Modes→COOL→SA.TR) and the

Cool Demand Trend (Operating Modes→COOL→TRD.C).

These trends will show the control how the space is reacting to the

current running conditions and help it decide when to add or

remove one stage from the requested stages. The Cool Stage

Increase Time (Configuration→COOL→C.INC) or the Cool

Stage Decrease Time (Configuration→COOL→C.DEC) has to

expire before another stage can be added or a stage can be

subtracted. If at any time the Supply−Air Temperature (SAT) falls

below the Minimum Supply Air Temperature Upper Level

(Configuration→COOL→SAT→SAT.U), the requested stages

will not be allowed to increase. If at any time the SAT falls below

the Minimum Supply Air Temperature Lower Level

(Configuration→COOL→SAT→SAT.L), the requested stages will

be reduced by one without honoring C.DEC. If SAT.L and SAT.U

are configured so that they are close together, the last stage of

compressor might cycle rapidly, slowed only by its minimum on

and off−time requirements.

Compressor Control

The compressor control works hand and hand with the staging

control. As the staging control requests stages, the compressor

control determines what actual compressors are available or

running and tries to provide stages for what is requested. The

availability of a compressor depends on time guards, circuit

diagnostics, outdoor temperature, and the unit size.

The Number of Circuits (Configuration→COOL→N.CIR)

configuration tells the control how many compressors are installed

on the unit. The Circuit A Lockout Temp

(Configuration→COOL→CIR.A →CA.LO), Circuit B Lockout

Temp (Configuration→COOL →CIR.B→CB.LO), and Circuit C

Lockout Temp (Configuration →COOL→CIR.C→CC.LO)

configurations set the outdoor temperature in which the respective

compressor is allowed to run down to. Timeguard A (Run

Status→COOL→CIR.A→TG.A), Timeguard B (Run

Status→COOL→CIR.B→TG.B), and Timeguard C (Run

Status→COOL→CIR.C→TG.C) display the time a respective

compressor has before it is available for use. Individual circuit

diagnostic tests are performed during operation which may or may

not allow a compressor to be used. The configuration point

Compressors On Circuit A (Configuration →COOL→N.A)

informs the control to run diagnostics on one or two compressors

for circuit A. The available stages at any given time are displayed

as Available Compressors (Run Status→COOL →AVL.C). The

actual compressors running at any given time are displayed as

Actual Cooling Stages (Operating Modes→COOL →ACT.C).

Compressor A (Run Status→COOL→CIR.A →CMP.A),

Compressor B (Run Status→COOL→CIR.B →CMP.B), and

Compressor C (Run Status→COOL→CIR.C →CMP.C) are

displayed on when the respective compressor is running.

There are time guards to protect the compressors. Compressor Min

On Time (Configuration→COOL→MRT.C) and Compressor Min

Off Time (Configuration→COOL→MOT.C) apply before a

compressor can be turned back on or turned off.

Outdoor Fan Control

Each unit has a means for variable outdoor airflow to control

condenser pressure control within an acceptable range by

responding to varied operating modes and ambient temperatures.

This is implemented differently on different units using

multi−speed motors, multiple outdoor fans, or variable−speed

motor controllers.

NOTE: Factory default configurations account for these model

differences and should not be changed. The default configurations

have been qualified over a large range of conditions and are

provided in case a field replacement of a control board occurs and

the settings need to be checked or manually configured. Outdoor

fan operation is further described below to assist in

troubleshooting.

The outdoor fans are controlled by levels. There are 4 levels of

operation (0−3) and the current operating level is shown as

Outdoor Fan Level (Operating Modes→COOL→F.LEV). The

fan level selected during operation is based on factory

configurations of outdoor temperature limits and condenser

pressure limits. These are in the Outdoor Fan Control submenu

(Configuration→COOL→OFC) and shown in Table 5. The

starting level is picked after a compressor is turned on and is based

on the Outdoor Air Temperature (Temperatures→AIR.T→OAT).

A circuit’s Saturated Condensing Temperature (Temperatures

→REF.T→SCT.x) can override the fan level at any time if the

specific Fan Level Max Pressure (Configuration→COOL→OFC

→x.MXP) is exceeded. This override will end if the circuit’s

saturated condensing temperature (SCT) drops below the specific

Fan Level Min Pressure (Configuration→COOL→OFC

→x.MNP). The number of fans and contactors on at a given fan

level depends on the specific unit options and size. See Tables 6

and 7 and below text for specific fan and contactor status at any

given fan level.

Units Without Humidi−MiZert System

Outdoor Fan Motors (OFM) are controlled by Outdoor Fan

Contactors (OFC) which are controlled by the main base board

(MBB).

For 48/50PG03−07 units, a duel speed motor is used. The

Compressor Contactor (C.A1) turns the OFM on in high speed and

the OFC1 is used to change to low speed.

For 48/50PG08−14 units, OFM1 is controlled by OFC1 and

OFM2 is controlled by OFC2.

For 48/50PG16 units, OFM1 is controlled by OFC1 and OFM1

and 2 are controlled by OFC2.

For 48/50PG20−28 and 48/50PM16−28 units, OFM1 is controlled

by OFC1, OFM4 is controlled by OFC3, and OFC2 controls the

remaining two fans (16 and 20 size) or remaining 4 fans (24 and 28

sizes).

Units With Humidi−MiZer System

Outdoor fan control for Humidi−MiZer units includes a

Motormaster variable−speed control of some or all outdoor fans,

depending on unit size. The Motormaster control automatically

adjusts the outdoor fan speed to maintain approximately 80 to

100F condenser temperature for circuit A at all outdoor ambient

temperatures. Some unit sizes have additional on/off staging of

some outdoor fans. The fan level operation is determined by some

or all Outdoor Fan Control configurations described above, plus

additional Humidi−MiZer Configuration (Configuration

→HZMR). Refer to the Humidi−MiZer operation section for

details on the Reheat function fan control.

48/50PG and PM

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Carrier 48 50PM C16-28 Manual

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