Carrier 30GT User Manual

Page 4

ALL FLOTRONIC UNITS

Units require control

relays

tained

R) and Time Delay Module. They may be ob-

rom your Carrier distributor under the following

Carrier Part Numbers:

and R2

Time Delay Module

115-v

24-v

DPDT
DPDT

H N 6 1 K K 0 4 0

DPDT

UNITS

THROUGH 060 (Except 020,

60 Hz, and 0 15, 50 Hz.)

IMPORTANT: On

2-compressor units,

the SEQUENCE switch on the control panel must

be in the l-2 position to obtain hot gas bypass

operation.

Run the conduit from the bypass valve to one of the

knockouts provided on the right side of the unit control
box. Connect the control wires as shown in Fig. 7.
UNITS

THROUGH 035 (except 020, 60 Hz,

and 015, 50 Hz) Connect control wires as shown in

Fig. 8. At LLSV, connect to existing splice containing
white wire.

T B 2

HGS

TB2

A. CONNECTIONS FOR SINGLE-COMPRESSOR

0 2 0 , 0 2 5 )

HGS

CONNECTIONS FOR TWO-COMPRESSOR UNITS

( 5 0 A N D 6 0 H Z :

See Combined Legend.

Fig. 7

Hot Gas Bypass Field Wiring;

Units

OPERATION AND ADJUSTMENT

The bypass valve is factory set to begin opening when

suction pressure drops to about 62 psig. This pressure
corresponds to a

water controller set point of

approximately 44 F. If the chilled water set point is lower
than 44 F, it will be necessary to decrease the bypass valve

setting for proper operation. Conversely, for

water

set points above

F, the bypass valve setting must be

increased. A change in condensing temperature will also

require a change in bypass valve set point. As condensing
temperature decreases, decrease the bypass

set

point until it opens at the desired conditions.

H G S

See Combined Legend.

Refer to unit wiring label inside front access door for complete
wiring schematic.

Fig. 8

Hot Gas Bypass

Wiring; 30GT Units

TB
T C 2

c l

COMBINED LEGEND

(Fig. 3 8)

Compressor Contactor

Female Quick-Conn)

Hot Gas Bypass Solenoid (Splice Conn)
Liquid Line Solenoid Valve

Terminal Block

Ring Conn)

Temperature Controller

Female Quick-Conn)

Terminal on TB

Terminal on Control Component

Factory Wiring

Field Wiring

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 2

Catalog No. 533-039

Printed in U.S.A.

Form

2-89

Replaces:

T a b