Carrier GTR040-420 Especificações descarregar pdf (Página 27)

ADDING ADDITIONAL UNLOADERS — See Table 7

below for required hardware.

Follow accessory instructions for installation. Connect un-

loader coil leads to PINK wires in compressor A1/B1 junction

box. Configuration items CA.UN and CB.UN in the OPT1

sub-mode of the configuration mode must be changed to match

the new number of unloaders. Two unloaders cannot be used

with hot gas bypass on a single circuit.

MINUTES LEFT FOR START — This value is displayed

only in the network display tables (using Service Tool or

ComfortWORKS® software) and represents the amount of

time to elapse before the unit will start its initialization routine.

This value can be zero without the machine running in many

situations. This can include being unoccupied, ENABLE/OFF/

REMOTE CONTACT switch in the OFF position, CCN not

allowing unit to start, Demand Limit in effect, no call for cool-

ing due to no load, and alarm or alert conditions present. If the

machine should be running and none of the above are true, a

minimum off time (DELY, see below) may be in effect. The

machine should start normally once the time limit has expired.

MINUTES OFF TIME (DELY, Configuration Mode under

OPT2) — This user configurable time period is used by the con-

trol to determine how long unit operation is delayed after power

is applied/restored to the unit. Typically, this time period is con-

figured when multiple machines are located on a single site. For

example, this gives the user the ability to prevent all the units

from restarting at once after a power failure. A value of zero for

this variable does not mean that the unit should be running.

LOADING SEQUENCE — The 30GTN,R and 30GUN,R

compressor efficiency is greatest at partial load. Therefore, the

following sequence list applies to capacity control.

The next compressor will be started with unloaders ener-

gized on both lead compressors.

All valid capacity combinations using unloaders will be

used as long as the total capacity is increasing.

LEAD/LAG DETERMINATION (LLCS, Configuration

Mode under OPT2) — This is a configurable choice and is

factory set to be automatic (for sizes 080-420) or Circuit A

leading (for 040-070 sizes). For 040-070 sizes, the value can be

changed to Automatic or Circuit B only if an accessory unload-

er is added to compressor B1. For 080-420 sizes, the value can

be changed to Circuit A or Circuit B leading, as desired. Set at

automatic, the control will sum the current number of logged

circuit starts and one-quarter of the current operating hours for

each circuit. The circuit with the lowest sum is started first.

Changes to which circuit is the lead circuit and which is the lag

are also made when total machine capacity is at 100% or when

there is a change in the direction of capacity (increase or de-

crease) and each circuit’s capacity is equal.

CAPACITY SEQUENCE DETERMINATION (LOAD,

Configuration Mode under OPT2) — This is configurable as

equal circuit loading or staged circuit loading with the default

set at equal. The control determines the order in which the steps

of capacity for each circuit are changed. This control

choice does NOT have any impact on machines with only

2 compressors.

CAPACITY CONTROL OVERRIDES — The following over-

rides will modify the normal operation of the routine.

Deadband Multiplier

— The user configurable Deadband

Multiplier (Z.GN, Configuration Mode under SLCT) has a

default value of 1.0. The range is from 1.0 to 4.0. When set to

other than 1.0, this factor is applied to the capacity Load/

Unload Factor. The larger this value is set, the longer the con-

trol will delay between adding or removing stages of capacity.

Figure 17 shows how compressor starts can be reduced over

time if the leaving water temperature is allowed to drift a larger

amount above and below the set point. This value should be set

in the range of 3.0 to 4.0 for systems with small loop volumes.

First Stage Override

— If the current capacity stage is zero,

the control will modify the routine with a 1.2 factor on adding

the first stage to reduce cycling. This factor is also applied

when the control is attempting to remove the last stage of

capacity.

Slow Change Override

— The control prevents the capacity

stages from being changed when the leaving fluid temperature

is close to the set point (within an adjustable deadband) and

moving towards the set point.

Ramp Loading (CRMP, Configuration Mode under SLCT)

— Limits the rate of change of leaving fluid temperature. If the

unit is in a Cooling mode and configured for Ramp Loading,

the control makes 2 comparisons before deciding to change

stages of capacity. The control calculates a temperature differ-

ence between the control point and leaving fluid temperature.

If the difference is greater than 4° F (2.2° C) and the rate of

change (°F or °C per minute) is more than the configured

Cooling Ramp Loading value (CRMP), the control does not

allow any changes to the current stage of capacity.

Table 7 — Required Hardware for Additional Unloaders

LEGEND *2 solenoid coils are included in the CXB Accessory.

†And associated modular units.

NOTE: Units with 2 unloaders and 2 hot gas bypass devices are not allowed.

UNIT

SIZE

COMPRESSOR UNLOADERS (QTY) PART NUMBER

Factory Standard Field-Installed Accessory

Unloader

Package

Solenoid

Coil

CXB

Accessory*

A1 B1 A1 B1

040 (60 Hz) 1 0 0 1 (1) 06EA-660---138 (1) EF19ZE024 Not Required

040 (50 Hz)

045 (60 Hz)

0 1 (1) 06EA-660---138 (1) EF19ZE024 Not Required

0 2 (2) 06EA-660---138 Not Required (1) 30GT-911---061

045 (50 Hz)

050-070

1 0 (1) 06EA-660---138 Not Required (1) 30GT-911---061

1 1 (2) 06EA-660---138 Not Required (1) 30GT-911---061

1 2 (3) 06EA-660---138 (1) EF19ZE024 (1) 30GT-911---061

0 1 (1) 06EA-660---138 (1) EF19ZE024 Not Required

0 2 (2) 06EA-660---138 Not Required (1) 30GT-911---061

080-110 †

130 (60 Hz)

1 0 (1) 06EA-660---138 Not Required (1) 30GT-911---061

0 1 (1) 06EA-660---138 Not Required (1) 30GT-911---061

1 1 (2) 06EA-660---138 Not Required (1) 30GT-911---061

130 (50 Hz)

150,170 †

1 0 (1) 06EA-660---138 (1) EF19ZE024 Not Required

0 1 (1) 06EA-660---138 (1) EF19ZE024 Not Required

1 1 (2) 06EA-660---138 (2) EF19ZE024 Not Required

190,210 † 00

1 0 (1) 06EA-660---138 (1) EF19ZE024 Not Required

0 1 (1) 06EA-660---138 (1) EF19ZE024 Not Required

1 1 (2) 06EA-660---138 (2) EF19ZE024 Not Required

CXB — Compressor Expansion Board

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 103 104

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