Step 2 - Rig And Place Unit; Step 3 - Piping Connections; Cooler Fluid, Vent, And Drain; Brine Units - Carrier EVERGREEN 30HXA Installation Instructions Manual

Step 2 — Rig and Place Unit
CAUTION
Rig unit from the top heat exchanger only. Rigging from
the bottom heat exchanger will cause the unit to be lifted
unsafely. Personal injury or damage to the unit may occur.
IMPORTANT: Install unit in area which will not be
exposed to ambient temperatures below 50 F (10 C).
Do not remove unit from skid until unit is in its final
location. Rig from the rigging holes provided in the top heat
exchanger. See Fig. 2-9, 11, and 12 for rigging and center of
gravity information. Lower the unit carefully onto the floor or
roller. Push or pull only on the skid, not the unit. If the unit is
moved on rollers, use a minimum of 3 evenly spaced rollers.
Areas where unit mounting points will be located must be
level to within / in. per ft (5 mm per m) along the long axis
1
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of the unit. Once unit is in place and level, bolt unit to the floor.
Use isolation pads under the unit to aid in vibration isolation as
required.
Step 3 — Piping Connections —
and 14B for typical piping applications.
COOLER FLUID, VENT, AND DRAIN — The inlet (re-
turn) fluid connection is always the lower of the 2 cooler
connections. See Fig. 13 for locations. A screen strainer with a
minimum of 20 mesh must be installed ahead of the cooler
inlet (within 10 ft [3.05 m]) to prevent debris from damaging
internal tubes of the cooler. Outlet (supply) fluid connection is
the upper connection of the 2 cooler connections.
The cooler has victaulic nozzles to connect to the field-
supplied piping. Plan the piping arrangement in accordance
with good piping practices and so that the piping does not cross
in front of the cooler head. Use flexible connections on cooler
piping to reduce vibration transmission. Offset the piping to
permit removal of the cooler head for maintenance. Install pipe
hangers where needed. Make sure no weight or stress is placed
on the water nozzle.
CAUTION
Cooler and condenser heads are cast iron. Welding is not
recommended. In the event that welding must be per-
formed, remove the chilled water flow switch and entering
and leaving fluid thermistors before welding. Reinstall flow
switch and thermistors after welding is complete. Failure to
remove these devices may cause component damage.
1. The cooler flow switch (CWFS) is factory installed in the
inlet nozzle and wired. If a cooler pump interlock is used,
the contacts must be wired to TB5. Refer to unit wire
diagrams.
IMPORTANT: Loss of flow protection is required for all
30HX chillers.
2. Provide openings in fluid piping for pressure gages and
thermometers (if used). These openings should be 5 to
10 pipe diameters from the unit water nozzles. For
thorough mixing and temperature stabilization, wells in
the leaving fluid pipe should extend at least 2 in. (50 mm)
into the pipe.
Although cooler has an air vent, it is recommended that a
field-supplied air vent be installed in the system to facilitate
servicing. Field-supplied shut-off and balancing valves should
also be installed to facilitate servicing and flow balancing.
chiller as possible. Locate air vent at highest point of the cooler
fluid system. See Fig. 13.
complete drainage of the system.
BRINE UNITS — Special factory modifications to the units
are required to allow them to operate at fluid temperatures less
than 34 F (1.1 C). Be sure that the fluid has sufficient inhibited
ethylene glycol or other suitable corrosion-resistant antifreeze
solution to prevent cooler freeze up. Condenser water flow
must be maintained to prevent freeze-up on unit applications
where condenser water does not contain antifreeze.
See Fig. 13, 14A,
PREPARATION FOR YEAR-ROUND OPERATION —
In areas where the piping or unit is exposed to 32 F (0° C) or
lower ambient temperatures, freeze-up protection is recom-
mended using inhibited ethylene glycol or other suitable
corrosion-resistant antifreeze solution and electric heater
tapes. Heater tapes should have a rating for area ambient
temperatures and be covered with a suitable thickness of
closed-cell insulation. Route power for the heater tapes from a
separately fused disconnect. Mount the disconnect within sight
from the unit per local or NEC codes. Identify disconnect as
heater tape power source with warning that power must not be
turned off except when servicing unit.
FILL FLUID LOOP — Fill the fluid loop with water (or anti-
freeze solution) and a corrosion-resistant inhibitor suitable for
the water of the area. Consult the local water authority for char-
acteristics of area water and a recommended inhibitor for the
cooler fluid loop. Also see 30HXA Low-Ambient Consider-
ations section on page 22.
head. See Fig. 2-9 for connection location. Install shutoff
valves to the drain line before filling the system with fluid.
INSULATE COOLER HEADS — Once the cooler water
lines and drain and vent lines have been installed and checked
for leaks, insulate the cooler heads with a suitable thickness of
closed-cell insulation. This will minimize the amount of con-
densation that forms on the cooler heads. When insulating the
cooler heads, allow for service access and removal of heads.
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Locate valves in return and supply fluid lines as close to the
Provide drain connections at all low points to permit
IMPORTANT: On brine applications where leaving cooler
water is less than 34 F (1.1 C), a minimum water flow of
0.75 gpm/ton (0.14 L/s per kW) should be maintained
through the condenser at all times. In addition to the
factory-installed chilled water flow switch, a factory-
supplied condenser water flow switch must be installed per
the switch manufacturer's instructions. The chiller must
control both the chilled water pump and the condenser
pump and utilize cooler and condenser pump interlocks.
The cooler pump must operate for a minimum of 10 min-
utes after the chiller has shut down and the condenser
pump must operate for 30 minutes after the chiller has shut
down. In the event of loss of condenser water flow, the
flow of chilled fluid to the evaporator must be stopped or
an isolation valve must be closed. Condenser head pressure
control valve must be coordinated with condenser flow
switch to ensure the minimum valve position does not pre-
vent flow detection. This is necessary to reduce the possi-
bility of condenser freeze-up.
IMPORTANT: Use of electric heat will not prevent freeze
up in the event of a power failure.
A drain connection is located at the bottom of the cooler
IMPORTANT: Before starting the unit, be sure all of the air
has been purged from the system.