Carrier 19XR - Install Vent Piping to Relief Valves

40
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.
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.
Table 30 — Relief Valve Locations
NOTE: All valves relieve at 185 psig (1275 kPa).
DANGER
Refrigerant discharged into confined spaces can displace
oxygen and cause asphyxiation.
LOCATION
FRAME
SIZE
RELIEF VALVE
OUTLET SIZE
COOLER
Two-Stage 6—A 1
1
/
4
-in. NPT FEMALE CONNECTOR
Two-Stage 7—B 1
1
/
4
-in. NPT FEMALE CONNECTOR
Two-Stage 7—C 1
1
/
4
-in. NPT FEMALE CONNECTOR
CONDENSER
Two-Stage 6—A 1
1
/
4
-in. NPT FEMALE CONNECTOR
Two-Stage 6—B 1
1
/
4
-in. NPT FEMALE CONNECTOR
Two-Stage 7—C 1
1
/
4
-in. NPT FEMALE CONNECTOR
Two-Stage 7—D 1
1
/
4
-in. NPT FEMALE CONNECTOR
OPTIONAL STORAGE TANK N/A 1-in. NPT FEMALE CONNECTOR
Fig. 20 — Relief Valve Arrangements, 19XR Two-Stage Compressor Frame Size 6
A — WITH ISOLATION VALVE
COOLER HEAT
EXCHANGER
FRAME SIZE
CONDENSER HEAT
EXCHANGER
FRAME SIZE
WITH/WITHOUT DISCHARGE
ISOLATION VALVE
VIEW CODE
COOLER
NO. VALVES
CONDENSER
NO. VALVES
A4
A4
With Optional Isolation Valve A 2 4
Without Optional Isolation Valve B 4 4
B4
With Optional Isolation Valve A 2 4
Without Optional Isolation Valve B 4 4
A6
A6
With Optional Isolation Valve A 2 4
Without Optional Isolation Valve B 4 4
B6
With Optional Isolation Valve A 2 4
Without Optional Isolation Valve B 4 4
B — WITHOUT ISOLATION VALVE