Carrier 19XR Make Electrical Connections

INSTALL VENT PIPING TO RELIEF VALVES — The

19XR chiller is factory equipped with relief devices on the

cooler and condenser shells. Refer to Fig. 23 and Table 10

for size and location of relief devices. Ventrelief devices to

the outdoors in accordance with ANSI/ASHRAE 15 (latest

edition) Safety Code for Mechanical Refrigeration and all

other applicable codes.

Refrigerant discharged into conﬁned spaces can dis-

place oxygen and cause asphyxiation.

1. If relief devices are manifolded, the cross-sectional area

of the relief pipe must at least equal the sum of the areas

required for individual relief pipes.

2. Provide a pipe plug near outlet side of each relief device

for leak testing. Provide pipe ﬁttings that allow vent pip-

ing to be disconnected periodically for inspection of valve

mechanism.

3. Piping to relief devices must not apply stress to the

device. Adequately support piping. A length of ﬂexible

tubing or piping near the device is essential on spring-

isolated machines.

4. Cover the outdoor vent with a rain cap and place a con-

densation drain at the low point in the vent piping to pre-

vent water build-up on the atmospheric side of the relief

device.

Table 10 — Relief Device Locations

RELIEF VALVE

OUTLET SIZE LOCATION

QUANTITY

Frame 5

Compressor With

Frame 7 or 8

Heat Exchanger

All

Others

1-in. NPT FEMALE

CONNECTOR Cooler 4 2

1-in.NPT FEMALE

CONNECTOR Condenser 4 2

1-in. NPT FEMALE

CONNECTOR Optional

Storage Tank 22

NOTE: All valves relieve at 185 psi (1275 kPa).

Make Electrical Connections — Field wiring must

be installed in accordance with job wiring diagrams and all

applicable electrical codes.

Do not run 120-v wiring into the control cabinet. The

control cabinet should only be used for additional extra-

low voltage wiring (50 v maximum).

Wiring diagrams in this publication (Fig. 24-31) are for

reference only and are not intended for use during actual in-

stallation; follow job speciﬁc wiring diagrams.

Do not attempt to start compressor or oil pump (even

for a rotation check) or apply test voltage of any kind

while machine is under dehydration vacuum. Motor in-

sulation breakdown and serious damage may result.

CONNECT CONTROLINPUTS — Connect the control in-

put wiring from the chilled and condenser water ﬂow switches

to the starter terminal strip. Wiringmay also be speciﬁed for

a spare safety switch, and a remote start/stop contact can be

wired to the starter terminal strip. Additional spare sensors

and Carrier Comfort Network modules may be speciﬁed as

well. These are wired to the machine control panel as indi-

cated in Fig. 24 and 25.

CONDENSER

WATER CONNECTIONS

OIL

RETURN LINE

CONNECTION

SERVICE

VALVES

REFRIGERANT

INLET VALVE

COMPRESSOR

MOUNTING

SPRINGS

Fig. 22 — Pumpout Unit

Fig. 23 — Relief Valve Locations