Carrier 30GTN015-035 Specifications download pdf (Page 11)

30GT Units —

With a call for the first compressor, the

HGBPR (hot gas bypass relay) is energized, completing a cir-

cuit to the appropriate TDR-HG (time delay relay-hot gas). The

field-supplied 620,000 ohm,

-w resistor permits approxi-

mately a one-minute time delay for the circuit pressures to sta-

bilize. After the time delay has completed its cycle, the HGBPS

(hot gas bypass solenoid) opens. If the circuit suction pressure

is below the setting of the hot gas bypass valve, the valve be-

gins to open. The valve continues to open until it either reaches

an equilibrium, or the maximum open position is reached. Dis-

charge 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.

All

Comfort

Link™ Units —

When the lead compres-

sor is started, the HGBP (hot gas bypass) solenoids are ener-

gized. The unloader(s) on the lead compressor is also energized

when the compressor is started. If the circuit suction pressure 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. Dis-

charge 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. The hot gas bypass

solenoid(s) are only used at the first stage of capacity when

starting the lead compressor and as the last stage of capacity

before shutting down the lead compressor. The solenoids are

not energized when the lag circuit starts even if the lead com-

pressor in the lag circuit is the only compressor running in the

circuit. The hot gas bypass solenoid(s) are deenergized when

the unit cycles off.

30HK040-060, 30HL050-060 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. The Scrolling Marquee, Navigator or CCN device

such as Service Tool must be used.

30HK, HL CONFIGURATION WITH SCROLLING

MARQUEE 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 ar-

row 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 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 En-

ter key so that ‘NO’ flashes. Use either arrow key to change the

value to ‘YES’ and press Enter.

30HK,HL CONFIGURATION WITH SERVICE TOOL —

Using the Service Tool, select the Carrier Controls option from

the menu. Select the chiller to be configured or Add, Upload

and then Select the chiller. Once selected, choose Modify, Con-

troller 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 By-

pass Select’ and use the spacebar to change its value to ‘Yes’.

Press the ‘F2’ key, Save and then Download. Select Upload

and then Enter to verify that the configuration was successfully

received by the chiller.

Using the Scrolling Marquee or Navigator display, follow

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

Service and Troubleshooting manual and use the Service Test

mode to verify proper operation of the solenoids (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 to the proper position. Close and secure

the control box door.

INSTALLATION IN

38AKS, AH/INDOOR FAN COIL

(CONSTANT VOLUME)

SPLIT SYSTEMCOMBINATION

NOTE: Application of hot gas bypass to 38AKS VAV (vari-

able air volume) systems is addressed in 38AKS/39E applica-

tion literature.

Step 1 — Install Piping (See Fig. 13)

1. In applications where the air handler refrigerant distribu-

tor is not equipped with a side outlet connection, it is rec-

ommended that a Sporlan in-line auxiliary side connector

with standard distributor be used. Refer to the installation

instructions for the indoor fan coil to obtain nozzle size

and distributor connection size. Select the auxiliary side

connector based on this information. The side connector

must be installed on refrigerant circuit no. 1 (first stage of

cooling) of the fan coil being used.

2. Install a field-supplied

-in. NPT to

-in. flare fitting on

the gage connection port of the compressor suction ser-

vice valve.

3. Sweat the pilot solenoid valve supplied in the hot gas ac-

cessary package directly to the hot gas bypass valve on

the

-in. ODF external equalizer port.

4. Install field-supplied

-in. copper tube (flared with a nut

on each end) between the compressor suction valve and

the hot gas pilot solenoid valve.

5. Connect a field-supplied

-in. OD copper tube between

the discharge line process tube (hot gas stub) and a field-

supplied manual shutoff service valve, avoiding any traps

in piping.

6. Connect another field-supplied

-in. OD copper tube be-

tween the manual shutoff valve outlet and the hot gas by-

pass valve inlet.

7. Connect a field-supplied

-in. OD copper tube between

the leaving side of the hot gas bypass valve and the Sporlan

auxiliary side connector (distributor-side connector).

Shut off all power to the unit and remove refrigerant charge

using an approved refrigerant recovery device before pro-

ceeding with installation.

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Carrier 30GTN015-035 Specifications Page 11

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