Install Water Piping To Heat Exchangers; Install Vent Piping To Relief Devices - Carrier AquaEdge 19DV Series Installation Instructions Manual

Step 4 — Connect Piping

INSTALL WATER PIPING TO HEAT EXCHANGERS

Install piping using job data, piping drawings, and procedures out-
lined below. A typical piping installation is shown in Fig. 12.
CAUTION
Factory-supplied insulation is not flammable but can be dam-
aged by welding sparks and open flame. Protect insulation
with a wet canvas cover.
CAUTION
To prevent damage to sensors, remove evaporator and con-
denser water temperature sensors before welding connect-
ing piping to water nozzles. Replace sensors after welding
is complete.
CAUTION
When flushing the water systems, isolate the chiller from
the water circuits to prevent damage to the heat exchanger
tubes.
1. Offset pipe flanges to permit removal of waterbox cover for
maintenance and to provide clearance for pipe cleaning. No
flanges are necessary with marine waterbox option; however,
water piping should not cross in front of the waterbox or
compressor because service access will be blocked.
2. Provide openings in water piping for required pressure
gages and thermometers. For thorough mixing and tem-
perature stabilization, wells in the leaving water pipe
should extend inside pipe at least 2 in. (50 mm).
3. Install air vents at all high points in piping to remove air
and prevent water hammer.
4. Field-installed piping must be arranged and supported to
avoid stress on the equipment and transmission of vibra-
tion from the equipment. Piping must be installed to pre-
vent interference with routine access for the reading,
adjusting, and servicing of the equipment. Provisions
should be made for adjusting the piping in each plane for
periodic and major servicing of the equipment.
5. Water flow direction must be as specified in Fig. 13 and 14.
NOTE: Entering water is always the lower of the 2 nozzles. Leav-
ing water is always the upper nozzle for evaporator or condenser
for two and three pass arrangements.
6. Install waterbox vent and drain piping in accordance with
individual job data. Consult certified drawings for connec-
tion size.
7. Isolation valves are recommended on the evaporator and
condenser piping to each chiller for service.
8. Apply appropriate torque on the retaining bolts in a criss-
cross pattern for the water box covers before insulating the
water box cover. The gasket can relax during transporta-
tion and storage and the water box cover requires retight-
ening of the bolts during installation.

INSTALL VENT PIPING TO RELIEF DEVICES

The 19DV chiller is factory equipped with a rupture disc on the
evaporator shell. Additionally for fire protection there are fusible
plugs on the refrigerant lube assembly and purge assembly; see
Fig. 9. Outlet size for these plugs is
lubrication assembly and
Refer to Table 13 and Fig. 15 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.
Refrigerant discharged into confined spaces can displace
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 conden-
sation drain at the low point in the vent piping to prevent
water build-up on the atmospheric side of the relief device.
5. If the vent tubing from the purge unit is connected to the
rupture disk vent piping, the piping should be sloped away
from the rupture disk to prevent liquid refrigerant from
condensing and accumulating on the atmospheric side of
the rupture disk causing potential damage to the relief
device.
6. If modulating valves are installed on the evaporator or
condenser, they should be installed on the outlet piping.
21
1 / -in. SAE Flare (male) for
4
3 / -in. SAE flare on the purge tank.
8
DANGER