Dunham-Bush WCFX 10, Инструкция по установке, эксплуатации и обслуживанию

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GENERAL INFORMATION
1.1 RECEIVING AND
INSPECTION
The unit should be inspected immediately, in the
presence of the carrier's representative, for any
evidence of damage during shipping. Any damage
should be noted on the carrier's delivery receipt
before it is signed. A damage claim should then
be filed by the purchaser against the delivering
carrier as all shipments are made at the
purchaser's risk. The receiving inspection
instructions, sent with the installation instructions,
should also be filled at this time and forwarded to
the Dunham-Bush Industries, M & E Service
Department.
1.2 RIGGING AND MOVING
Each unit has been carefully tested and inspected
at the factory where every precaution was taken to
ensure that it reaches its destination in perfect
condition. It is very important that the installers,
movers, and riggers use the same care in handling
the unit. The unit is designed to be lifted from the
(4) lifting holes in the tube sheets. It can also be
moved on skids placed under the tube sheets. For
proper rigging, see Figure 1.2.
It is important to protect the unit from damage
during storage, rigging and installation. Particular
care should be given to avoid damage to controls
and piping. Do not allow the unit to be used as a
ladder or scaffold!
1.3 DIMENSIONAL DATA
Dimensional outline drawings of the packages are
shown in Figures 1.3. Note especially the space
and clearance requirements necessary for
servicing the unit.
1.4 APPLICATION
PRECAUTIONS
The following instructions are intended to help
assure proper and successful application of your
water chilling machines.
1.4.1 Water Conditions
Standard construction of the evaporator
and condenser used in Dunham-Bush
model WCFX chillers is copper tubes
with steel tube sheets and liquid heads.
These materials are generally suitable for
use with clean fresh water found in most
localities. However, minerals and other
contaminants found in some water
systems may promote aggressive attack
on the tubes or tube sheets, resulting in
failure with serious consequences for the
entire package chiller.
Since Dunham-Bush has no control over
the condition of the water used in these
machines, we can take no responsibility
for failure of tubes or tube sheets due to
water corrosion or erosion. It is
recommended that the buyer obtain the
services of local water treatment
specialists to prescribe water treatment.
1.4.2 Chilled Water Flow
The Dunham-Bush WCFX Packaged
Water Chiller is designed for a constant
chilled water flow rate, even when the
cooling load is varying. The machine
will generally perform satisfactorily with
steady flow rates deviating from design
by as much as +10% / -50%. However,
varying water flow rates can cause
control instability, which will result in
undesirable system effects, particularly
poor control of leaving chilled water
temperature. If two-way valves are used
to control flow through cooling coils,
some means such as an automatic
modulating valve should be provided in
the system to maintain steady flow
through the evaporator.
If chilled water flow rate and/ or load
vary, the variation must be controlled so
that return water temperature does not
vary at a rate exceeding 2°F [1.1°C] per
minute.
If the chilled water system is arranged
for the dual purpose of cooling and
heating, the evaporator must incorporate
valves to prevent the flow of hot water
through it. This can be done with either
manual or automatic shutoff valves, but
water temperature entering the
evaporator must never exceed 90°F
[32°C].
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