Install Vent Piping To Relief Valves - Carrier 19XR Installation Instructions Manual

INSTALL VENT PIPING TO RELIEF VALVES — The
19XR chiller is factory equipped with relief valves on the
cooler and condenser shells. Refer to Table 30 and Fig. 20 and
21 for size and location of relief devices. Vent relief devices to
the outdoors in accordance with ANSI/ASHRAE 15 (latest
edition) Safety Code for Mechanical Refrigeration and all
other applicable codes.
DANGER
Refrigerant discharged into confined spaces can displace
oxygen and cause asphyxiation.
LOCATION
COOLER
CONDENSER
OPTIONAL STORAGE TANK
NOTE: All valves relieve at 185 psig (1275 kPa).
A — WITH ISOLATION VALVE
COOLER HEAT CONDENSER HEAT
EXCHANGER EXCHANGER
FRAME SIZE FRAME SIZE
A4
A6
Fig. 20 — Relief Valve Arrangements, 19XR Two-Stage Compressor Frame Size 6
Table 30 — Relief Valve Locations
FRAME
SIZE
Two-Stage 6—A
Two-Stage 7—B
Two-Stage 7—C
Two-Stage 6—A
Two-Stage 6—B
Two-Stage 7—C
Two-Stage 7—D
N/A
WITH/WITHOUT DISCHARGE
ISOLATION VALVE
With Optional Isolation Valve
A4
Without Optional Isolation Valve
With Optional Isolation Valve
B4
Without Optional Isolation Valve
With Optional Isolation Valve
A6
Without Optional Isolation Valve
With Optional Isolation Valve
B6
Without Optional Isolation Valve
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
piping to be disconnected periodically for inspection of
valve mechanism.
3. Piping to relief devices must not apply stress to the de-
vice. Adequately support piping. A length of flexible tub-
ing 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.
RELIEF VALVE
OUTLET SIZE
1
1 / -in. NPT FEMALE CONNECTOR
4
1
1 / -in. NPT FEMALE CONNECTOR
4
1 1 / -in. NPT FEMALE CONNECTOR
4
1 1 / -in. NPT FEMALE CONNECTOR
4
1 1 / -in. NPT FEMALE CONNECTOR
4
1
1 / -in. NPT FEMALE CONNECTOR
4
1
1 / -in. NPT FEMALE CONNECTOR
4
1-in. NPT FEMALE CONNECTOR
B — WITHOUT ISOLATION VALVE
VIEW CODE
A
B
A
B
A
B
A
B
40
COOLER CONDENSER
NO. VALVES NO. VALVES
2 4
4 4
2 4
4 4
2 4
4 4
2 4
4 4