Installation; Water Connections; Fresh Air Intake; Important - Carrier 42 DW Serie Manual De Instalación

Installation

The unit can be predisposed for ducting with circular conduits.
Each of the following configurations can be executed with the items
supplied with the unit (See fig. 27).
42DWC07 – 42DWC09 – 42DWD09
(See fig. 28/29/30/31/32).
42DWC12 – 42DWC16 – 42DWD16
(See fig. 33/34/35/36/37/38/39).
Do not adopt configurations other than those indicated above, as
this may compromise the correct operation of the unit. In particular,
avoid operating the unit with just one aperture (See fig. 40)
Predisposition of the unit for circular front outlets
The unit is supplied with a front enclosure panel with 8" diameter
circular cut-outs (See fig. 41).
Before removing the cut-outs, cut the insulation on both sides of the
panel with a suitable knife. This facilitates opening and prevents
damage to the insulation.
After removing the cut-outs, make certain that the insulation covers
all the parts in steel sheet (See fig. 42).
After removing the cut-outs, replace the front panel of the unit.Also
using the screws supplied (See fig. 43/44).
The area of the panel which can be used for fixing the 8" circular
flanges (not supplied) is as shown in the figure. Avoid drilling or
fastening screws in the shaded area of the figure so as not to
damage the unit's tray (See fig. 45).
Installation with side outlet
The unit is predisposed so that it can be installed in corridors to
make optimum use of the two circular outlets on the sides. In order
to prepare the unit for this type of installation, proceed as follows:
Remove the two cut-outs in the sides of the unit (See fig. 46).

Water connections

Make the heat exchanger water connections with the necessary
components, using material which will guarantee that the screwed
joints are leakproof.
The unit is provided with inlet and outlet 3/4" F connections for both
2 and 4 pipe versions. The unit has also an air relief valve* and a
drainage valve* which can be both used by means of a 8 mm
wrench.
Note that the coil can be drained only partially; for complete
drainage of the unit refer to section "EMPTYING THE
PLANT" in the Maintenance sub-section.
* 2 if 4 pipe unit is installed (See fig. 53).
Note: for an application with a water circuit, the lollowing
recommendations must be taken into considerationt:
1. The water pump should pump into the evaporator, and draw
from the installation side.
After removal, make certain that the insulation covers the steel
sheet around the cut area (See fig. 47).
The area which can be used for fixing the 8" circular flanges (not
supplied) is as shown in the figure.
Avoid drilling or fastening screws in the areas highlighted in the
figure so as not to damage the unit's tray. Replace the front panel of
the unit with the panel supplied (See fig. 43/48/49).

Fresh air intake

There is a cut-out on the side of the unit, which can be used as a
fresh air intake. It can be opened with a screwdriver (See fig. 50).
Ducting
IMPORTANT: the ducting must be designed and calculated by
qualified technicians.
Determine the dimensions of the ducts according to the air flow rate
required and the available static pressure of the unit (refer to the fan
diagrams on previous pages).
You are advised to adhere to the following recommendations:
• Regardless of the type of duct used, it must not be made of
inflammable material, which produces toxic gases in the event of
fire. The internal surfaces must be smooth and not contaminate
the air passing through them. You are advised to use ducts in
galvanised steel, suitably insulated, to prevent the formation of
condensate and thermal losses.
• The ducts should be joined with flexible couplings which absorb
vibrations, prevent noise transmission inside the ducting and allow
access to the unit.
• As far as possible, avoid bends near the unit's air outlet. If this is
not possible, the radius of curvature must be as wide as possible;
use internal deflectors if the duct is of large dimensions.
2. It is advisable to install shut-off valves to allow isolation of the
most important circuit components as well as the chiller itself.
These valves (ball, globe and butterfly valves) should produce a
minimum loss of charge when they are open.
3. Provide unit and system drains and vents at the highest system
point (refer to section "EMPTYING THE PLANT" in the
Maintenance sub-section).
4. Install purge valves in the highest part of the circuit.
5. It is essential to ensure sufficient water circulation in the heat
exchanger.
6. All piping must be adequately insulated.
7. After the installation or after circuit repair the whole installation
must be cleaned completely, with special attention to the filters.
42 DW 21