Carrier GTR040-420 Especificações descarregar pdf (Página 31)

When a specific item is located, the item name appears on

the left of the display, the value will appear near the middle of

the display and the units (if any) will appear on the far right of

the display. Press the key at a changeable item and

the value will begin to flash. Use the up and down arrow keys

to change the value, and confirm the value by pressing the

key.

Two items, OAT Outside Air Temperature (Temperature

Mode, Sub-mode UNIT) and SPT Space Temperature (Tem-

perature Mode, Sub-mode UNIT) can be forced to a value at

the Navigator. Use the procedure outlined above to change and

force the value. If one of these two points has been forced, a

flashing “f” indicating the force will appear next to the value.

To remove the force, select the item. Press the key so

that the value is flashing. Press the up and down arrow keys

simultaneously and the force will be removed.

Changing item values or testing outputs is accomplished in

the same manner. Locate and display the desired item. Press

so that the item value flashes. Use the arrow keys to

change the value or state and press the key to accept

it. Press the key to return to the next higher level of

structure. Repeat the process as required for other items.

Items in the Configuration and Service Test modes are pass-

word protected. The words ‘Enter Password’ will be displayed

when required, with the default password also being displayed.

Use the arrow keys to change the number and press

to enter the digit. Continue with the remaining digits of the

password. The default password is 1111. The password can

only be changed at the Navigator or through CCN devices such

as ComfortWORKS®, ComfortView™ and Service Tool.

Adjusting the Contrast —

The contrast of the display

can be adjusted to suit ambient conditions. To adjust the con-

trast of the Navigator, press the key until the display

reads, “Select a menu item.” Using the arrow keys move to the

Configuration mode. Press to obtain access to this

mode. The display will read:

> TEST OFF

METR OFF

LANG ENGLISH

Pressing will cause the “OFF” to flash. Use the up

or down arrow to change “OFF” to “ON”. Pressing

will illuminate all LEDs and display all pixels in the view

screen. Pressing and simultaneously al-

lows the user to adjust the display contrast. The display will

read:

Adjust Contrast

- - - -+ - - - - - - - - - - - - - - -

Use the up or down arrows to adjust the contrast. The

screen’s contrast will change with the adjustment. Press

to accept the change. The Navigator will keep this

setting as along as it is plugged in to the LEN bus.

Adjusting the Backlight Brightness —

The back-

light of the display can be adjusted to suit ambient conditions.

The factory default is set to the highest level. To adjust the

backlight of the Navigator, press the key until the

display reads, “Select a menu item.” Using the arrow keys

move to the Configuration mode. Press to obtain ac-

cess to this mode. The display will read:

> TEST OFF

METR OFF

LANG ENGLISH

Pressing will cause the “OFF” to flash. Use the up

or down arrow keys to change “OFF” to “ON”. Pressing

will illuminate all LEDs and display all pixels in the

view screen. Pressing the up and down arrow keys simulta-

neously allows the user to adjust the display brightness. The

display will read:

Adjust Brightness

- - - - - - - - - - - - - - - - - +

Use the up or down arrow keys to adjust the brightness. The

screen’s brightness will change with the adjustment. Press

to accept the change. The Navigator will keep this

setting as long as it is plugged in to the LEN bus.

Service Test (See Table 10) —

Both main power and

control circuit power must be on.

The Service Test function should be used to verify proper

operation of compressors, unloaders, hot gas bypass (if in-

stalled), cooler pump and remote alarm relays, EXVs and con-

denser fans. To use the Service Test mode, the Enable/Off/

Remote Contact switch must be in the OFF position. Use the

display keys and Table 10 to enter the mode and display TEST.

Press twice so that OFF flashes. Enter the password if

required. Use either arrow key to change the TEST value to the

ON position and press . Switch the Enable/Off/

Remote Contact switch to the Enable position (Version 2.3 and

later). Press and the button to enter the OUTS

or COMP sub-mode.

Test the condenser fan, cooler pump, and alarm relays by

changing the item values from OFF to ON. These discrete out-

puts are turned off if there is no keypad activity for 10 minutes.

Use arrow keys to select desired percentage when testing ex-

pansion valves. When testing compressors, the lead compres-

sor must be started first. All compressor outputs can be turned

on, but the control will limit the rate by staging one compressor

per minute. Compressor unloaders and hot gas bypass relays/

solenoids (if installed) can be tested with compressors on or

off. The relays under the COMP sub-mode will stay on for

10 minutes if there is no keypad activity. Compressors will stay

on until they are turned off by the operator. The Service Test

mode will remain enabled for as long as there is one or more

compressors running. All safeties are monitored during this test

and will turn a compressor, circuit or the machine off if re-

quired. Any other mode or sub-mode can be accessed, viewed,

or changed during the TEST mode. The MODE item (Run Sta-

tus mode under sub-mode VIEW) will display “0” as long as

the Service mode is enabled. The TEST sub-mode value must

be changed back to OFF before the chiller can be switched to

Enable or Remote contact for normal operation.

Configuring and Operating Dual Chiller Con-

trol (See Tables 19A and 19B) —

The dual chiller

routine is available for the control of two units supplying

chilled fluid on a common loop. This control is designed for a

parallel fluid flow arrangement only. One chiller must be con-

figured as the master chiller, the other as the slave chiller. An

additional leaving fluid temperature thermistor (Dual Chiller

LWT) must be installed in the common chilled water piping as

shown in Fig. 21 and connected to the master chiller. See Field

Wiring section for Dual Chiller LWT Accessory sensor control

ENTER

ESCAPE

ENTER

ESCAPE

ENTER

ENTER ESCAPE

ENTER

ESCAPE

ENTER

ESCAPE

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