Dunham-Bush HRSC - D, Operating & Maintenance Instructions

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GENERAL
Packaged chillers are designed to cool water or other non-
corrosive liquids. Water is circulated through the direct ex-
pansion cooler where it is cooled to the desired temperature
then circulated to cooling coils for air conditioning, or to
other types of heat exchangers for process cooling.
Care should be taken to see that the equipment is properly
installed and adjusted. An installer or operator should first
become familiar with the information contained in this
manual.
INSPECTION
When the equipment is delivered, it is important that the fol-
lowing inspection be completed in the presence of the carrier’s
representative.
1. Check all crates and cartons received against the Bill of
Lading/Shipping Papers to be sure they agree.
2. Check the model number and the electrical characteristics
on the nameplate to determine if they are correct.
3. Check for freight damage, shortages or other discrepan
cies and note them on the delivery receipt before
signing.
In the event that any damage is found, a damage claim should
immediately be filed by the purchaser against the delivering
carrier as all shipments are F.O.B. Factory.
STORAGE
The HRSC unit is designed for indoor use and should be
stored indoors and/or protected from the elements.
RIGGING
General - Each unit has been carefully tested and crafted at
the factory where every precaution is taken to assure that
the unit reaches you in perfect condition. It is very important
that the riggers and movers should use the same care and
precaution in moving the equipment into place. Make sure
that chains, cables, or other moving equipment are placed
so as to avoid damage to the unit or piping. The refrigerant
piping must not be used as a ladder or as a hand hold. Do
not attach a chain hoist sling to the piping or equipment.
Move the unit in an upright position and let it down gently
from trucks or rollers.
Rigging and Moving - Any unit mounted on skids may be
moved with a forklift, but care must be taken not to damage
the unit with forks. The skids should not be removed until
the unit is at its final location.
The HRSC units are to be rigged thru the holes in the base
side rails.
In all cases, spreader bars must be used between
rigging lines to prevent damage. The unit must be lifted
using
All Rigging Point s. Refer to Rigging Instructions on
pages 29 & 30.
LOCATION & CLEARANCE
Location of the equipment and the size of the equipment
room require careful consideration of the following factors:
1. Route by which the chiller will be moved within the build
ing to the equipment room. Make sure there are adequate
clearance and floor strength through doors and passage
ways.
2. Space required for final connections and for normal equip-
ment maintenance. Sufficient clearance should be allowed,
between unit and walls, to permit cleaning or repair of
cooler tubes.
3. Effect of location on piping sizes and piping layout.
4. Location of service facilities; power supply, water and
approved drainage.
5. Motor starting restrictions of local power company.
Another consideration which must be taken into account is
that the unit should be mounted away from noise sensitive
spaces and must have adequate support to avoid vibration
and noise transmission into the building. Units should be
mounted over corridors, utility areas, rest rooms or other
auxiliary areas where sound levels are not an important fac-
tor. Sound and structural consultants should be retained for
recommendations on critical installations.
FOUNDATION
A flat concrete foundation or floor, which can support the
weight of the equipment, must be provided. The unit must
be level for proper operation and functioning of controls.
VIBRATION ISOLATION
Under certain critical conditions, it may be necessary to in-
stall vibration isolators under the base of the Packaged Chiller.
Rubber-in-shear or spring vibration isolators are offered as
optional items. When spring isolators are used, flexible con-
nections must be installed in the water piping system and in
the refrigerant lines of split systems. Note: These flexible con-
nectors must be suitable for the fluid and pressures involved.
All piping which is external to the packaged chiller must be
supported by spring mounted hangers and any piping which
goes through the wall, ceiling or floor should be properly
sheathed to prevent transmission of piping vibration to the
structure.
When spring isolators are used, electrical service to the unit
must also be flexibly connected, by means of a 36" section of
flexible conduit.
PIPING CONNECTIONS
Water Connections, Chilled Water Piping - After the unit
has been leveled, the external water piping may be made
up. Be sure water piping is connected to the correct fittings.
The water out connection is closest to the expansion valve
(R-in) end. A chilled water flow switch must be installed in
the external chilled water outlet piping.
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