Carrier 30GTN015-035 Specifications download pdf (Page 8)

30GTN,GTR,GUN,GUR040-420 Units

— Open the control

box door. Locate terminal block TB5. See Fig. 8. Using field-

supplied wiring, conduit and fittings wire both solenoid valves.

Wires external to the control box must be run in field-supplied

conduit. Use one of the predrilled holes in the control box to

run the wires to pilot the solenoid valves from the control box.

Connect one lead from each of the solenoids to terminal block

TB5-9. Connect the other lead from each solenoid to TB5-12.

See Fig. 9.

30GTN,GTR,GUN,GUR040-420 Configuration

— Once the

installation and wiring of both solenoid valves is complete, the

control must be configured for the hot gas bypass option. To do

this, place the Enable/Off/Remote Contact switch in the Off

position. Using the Scrolling Marquee display or Navigator

display, select the Configuration mode LED (press the Escape

key until the screen is blank and use the arrow keys to illumi-

nate the LED). Press the Enter key and then the down arrow

key to display ‘OPT1’. Press the Enter key again and use the

down arrow key until ‘HGB.S’ is displayed. Press the Enter

key twice. The words ‘PASS’ and ‘WORD’ will flash. Press

the Enter key 4 times for the standard ‘1111’ password. Use the

arrow keys if necessary to correctly enter unique passwords.

Once the password is entered, press the Enter key so that ‘NO’

flashes. Use either arrow key to change the value to ‘YES’ and

press Enter. Follow the instructions given in the Control Start-

Up, Operation, Service and Troubleshooting manual and use

the Service Test mode to verify proper operation of the sole-

noids (illuminate the Service Test LED, enable the Test mode

using the ‘TEST’ sub-mode and enter the ‘COMP’ sub-mode

to test the output ‘HGBP’). Note that both solenoids are wired

in parallel and will be energized at the same time. When the

test has been completed, disable the ‘TEST’ mode and return

the Enable/Off/Remote Contact switch to the proper position.

Close and secure the control box door.

30HK040-060, 30HL050-060 Units

— Open the control box

door. Locate terminal block TB2. See Fig. 10. Using field-

supplied wiring, conduit and fittings wire both pilot solenoid

valves. Wires external to the control box must be run in field-

supplied conduit. Use one of the predrilled holes in the control

box to run the wires to the solenoid valves from the control

box. Connect one lead from each of the solenoids to terminal

block TB2-3. Connect the other lead from each solenoid to

TB2. See Fig. 11.

30HK040-060, 30HL050-060 Configuration

— Once the in-

stallation and wiring of both solenoid valves is complete, the

control must be configured for the hot gas bypass option. To do

this, place the Enable/Off/Remote Contact switch in the Off

position. The Scrolling Marquee display or Navigator or a

CCN device such as Service Tool must be used.

30GTN015-035 Units

— Open the control box door. Remove

the inner panel. Remove the compressor junction box cover.

Locate the capped orange and white wires labeled ‘HGBP’.

The wire nuts are to be removed and these wires should be

removed from the junction box strain relief and routed to the

solenoid coil. Using field wire nuts, connect one lead of the

solenoid to the orange wire and connect the other lead of the

solenoid to the white wire. See Fig. 12.

30GTN015-035 Configuration

— Once the installation and

wiring of the solenoid valve is complete, the control must be

configured for the hot gas bypass option. To do this, place the

Enable/Off/Remote Contact switch in the Off position. The

Scrolling Marquee, Navigator or a CCN device such as Service

Tool must be used.

30GTN015-035 and 30HK,HL Configuration with Scrolling

Marquee Display or Navigator — Using the Scrolling Mar-

quee or Navigator display, select the Configuration mode LED

(press the Escape key until the screen is blank and use the

arrow keys to illuminate the LED). Press the Enter key and

then the down arrow key to display ‘OPT1’. Press the Enter

key again and use the down arrow key until ‘HGB.S’ is dis-

played. Press the Enter key twice. The words ‘PASS’ and

‘WORD’ will flash. Press the Enter key 4 times for the stan-

dard ‘1111’ password. Use the arrow keys if necessary to cor-

rectly enter unique passwords. Once the password is entered,

press the Enter key so that ‘NO’ flashes. Use either arrow key

to change the value to ‘YES’ and press Enter.

30GTN015-035 and 30HK,HL Configuration with Service

Tool — Using the Service Tool, select the Carrier Controls op-

tion from the menu. Select the chiller to be configured or Add,

Upload and then Select the chiller. Once selected, choose Mod-

ify, controller and then the OPTIONS1 table. Press the ‘F2’ key

and choose Upload for the current configurations. Select Save

and then Edit. Highlight the second item in the table, ‘Hot Gas

Bypass Select’ and use the spacebar to change its value to

‘Yes’. Press the ‘F2’ key, Save and then Download. Select Up-

load and then Enter to verify that the configuration was suc-

cessfully received by the chiller.

Testing Solenoid Operation on

ComfortLink™ Units — Us-

ing the Scrolling Marquee display or Navigator display, follow

the instructions given in the Controls Start-Up, Operation Ser-

vice and Troubleshooting manual and use the Service Test

mode to verify proper operation of the solenoid(s) (illuminate

the Service Test LED, enable the Test mode using the ‘TEST’

sub-mode and enter the ‘COMP’ sub-mode to test the output

‘HGBP’). Note that both solenoids (30HK,HL units) are wired

in parallel and will be energized at the same time. When the

test has been completed, disable the ‘TEST’ mode and return

the Enable/Off/Remote Contact switch to the proper position.

Close and secure the control box door.

OPERATION AND ADJUSTMENT

(30GN,GT,GTN,GTR,GUN,GUR,HK,HL

CHILLERS)

The bypass valve is factory set to begin opening when suc-

tion pressure drops to about 62 psig (427 kPa). This pressure

corresponds to a chilled fluid controller set point of approxi-

mately 44 F (7 C). For R-134a systems (30GUN,GUR) the

valve will need to be adjusted. Recommended setting for 44 F

(7 C) leaving water is approximately 30 psig (206 kPa). If the

chilled fluid set point is lower than 44 F (7 C), it will be neces-

sary to decrease the bypass valve setting for proper operation.

Conversely, for chilled fluid set points above 44 F (7 C), the

bypass valve setting must be increased. A change in condens-

ing temperature will also require a change in bypass valve set

point. As condensing temperature decreases, decrease the by-

pass valve set point until it opens at the desired conditions. A

-in. hex wrench is required. Remove the cap and turn the

adjustment nut with the hex wrench. A clockwise rotation in-

creases the setting, and counterclockwise rotation decreases the

setting.

30GN Units —

When the lead compressor is started, the

HGBPR (hot gas bypass relay) is energized if the compressor

unloader is active, completing a circuit to the appropriate

HGBPS (hot gas bypass solenoid) and opening the solenoid

valve. The time delay for the circuit pressures to stabilize is ac-

complished by the microprocessor. If the circuit suction pres-

sure is below the setting of the hot gas bypass valve, the valve

begins to open. The valve continues to open until it either

reaches an equilibrium, or the maximum open position is

reached. Discharge gas is bypassed into the mixed phase line

between the expansion valve and the cooler. This condition

continues until the suction pressure rises above the setting or

the unit cycles off.

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Carrier 30GTN015-035 Specifications Page 8

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