Carrier 30GTN015-035 Specifications download pdf (Page 3)

Solenoid Pilot Valve

— Install the solenoid pilot valve in the

external equalizer line of the bypass valve. The solenoid valve

has a

-in. ODF inlet and a

-in. SAE (Society of Automo-

tive Engineers, U.S.A.) outlet. Install field-supplied

-in. OD

copper tubing from the SAE connection to the suction service

valve of the lead compressor in the circuit.

Manual Shutoff

— Connect a field-supplied manual shutoff

service valve in discharge line, avoiding traps in piping to hot

gas bypass valve.

30GTN015-035, 30HK040-060, AND 30HL050,060

UNITS — See Fig. 3.

Bypass Line

— Connect the field-supplied copper tubing to

the factory-provided stubs (see Fig. 2) in the hot gas discharge

line from the circuit A compressor and in the circuit A liquid

line between expansion valve and cooler (stubs are sealed from

factory). Repeat for circuit B on 30HK,HL units.

Bypass Valve

— Install the bypass valve in the bypass line as

close to the cooler as possible. This minimizes liquid storage

between valve and cooler when valve is closed and prevents

flood of liquid refrigerant when the valve opens. To ensure

proper closing, install the bypass valve in a horizontal section

of the bypass line, with the solenoid pilot valve installed verti-

cally (coil on top).

Solenoid Pilot Valve

— Install the solenoid pilot valve in the

bypass valve at the external equalizer (

-in. OD sweat con-

nection). The outlet side of the pilot valve is a

-in. SAE

(Society of Automotive Engineers, U.S.A.) thread. Run a

-in. OD, copper, field-supplied tube from this connection to

the thermostatic expansion valve (TXV) equalizer line. If the

connection is made directly to the TXV, use a

-in. flare x

-in. female flare tee. If the connection is made into the equal-

izer line, use a standard

-in. flare tee.

Manual Shutoff

— Connect a field-supplied manual shutoff

service valve in circuit A discharge line, avoiding traps in pip-

ing to hot gas bypass valve. Repeat for circuit B on 30HK,HL

units.

Step 3 — Dehydrate and Recharge Circuit —

When piping has been completed, leak test the assembly and

replace the filter drier or core(s) (field supplied) for the circuit.

After core (or drier) replacement, evacuate, dehydrate, and

recharge the circuit, using approved refrigerant recovery

device.

CIRCUIT A SIDE

CIRCUIT B SIDE

SUCTION PORT

OF SERVICE

VALVE

DISCHARGE

STUB TUBES

Fig. 2 — Factory-Sealed Discharge Line Stub Locations

(30GN,GT,GTN,GTR,GUN,GUR100 Shown)

1 2 3 4 5 6 7 8 ... 15 16

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Carrier 30GTN015-035 Specifications Page 3

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