GENERAL
INST
ALLA
TION
DUCTED WATER COOLED PACKAGED AIR CONDITIONERS
CWP models (c/w UC8)
Installation & Maintenance
1. GENERAL
1.1 Introduction
Follow these instructions to ensure the optimum
performance, reliability and durability.
Units must be installed in accordance with all national and
regional and local regulations and bylaws.
The appropriate permits must be acquired and adhered
to. Seismic restraints must be fitted if required.
The accompanying 'R32 Handling Ducted Units' pamphlet
forms part of these Installation & Maintenance instructions.
!
WARNING.
These units use R32 refrigerant (Class A2L) which is
mildly flammable.
The system shall be installed, operated and stored in a
adequately ventilated space where there is no continuously
operating open flames (eg an operating gas appliance) or
other R32 ignition source. If the refrigerant gas comes into
contact with fire, a poisonous gas may occur. Be aware that
R32 does not contain an odour.
2. INSTALLATION
2.1 Positioning & Mounting
CWP units are designed to be fitted in a ventilated
cupboard or closet and used with simple, short duct
layouts. Units should be located as close to the space to
be air conditioned as acoustic criteria allows.
When determining the position of the air conditioner, allow
adequate space around the unit to facilitate water pipe/
hose connections, condensate drainage, future servicing
and maintenance.
For apartment/hotel buildings, locate the units as close as
possible to the shared foyer/corridor of each floor of the
building to minimise the length and cost of water piping,
and electrical conduit.
The CWP unit has two pair of IN/OUT water connections
(top or front). Choose the best pair to suit your
application.
For major changes of components, the whole unit would
need to be removed from a tight closet space. Please
consider this when installing the CWP. This should
include, but not be limited to, the use of isolation valves
and barrel unions on waterlines, easily accessible
electrical isolations on all external (including control
circuit) power supply, and easily detached flexible duct
connection.
Ensure there is enough working space in front of the
electrical access panel. Allow adequate clearance for the
filter to be removed for cleaning.
Ventilation of the installation space, at the base level,
permits refrigerant to disperse in the unlikely event of a
leak.
Fasten the unit to a solid base using at least two of the
four mounting points in the feet. Some commercial rubber
pads between the unit feet and the base can minimise
transmission of vibration. Alternatively, use holding straps
to secure the unit to the place.
2.2 Condensate Drain
Mount the unit level as it comes with a sloping drain tray.
The unit condensate drain is 'U' trapped inside the unit,
therefore NO EXTERNAL TRAP REQUIRED.
The external drain line must not be trapped or piped to a
level above the drain tray.
The drain line must be maintained at least 19 mm ID
along its full length. A vent pipe is recommended (refer
figure 1).
OPEN
DRAIN
MINIMUM
SLOPE
20 mm PER m
(1 IN 50)
100 mm
APPROX.
AIR VENT PIPE (10 ID)
500 mm MAX.
FROM UNIT
NO TRAP
REQUIRED
Figure 1 Condensate Drain
Check drain by pouring water into the drain tray (at the
coil, behind the filter) and ensuring that it clears (with the
unit operating). Failure to adhere to these instructions
could cause flooding. If necessary, fit an external
condensate lift-pump to assist in achieving adequate
slope in the drain line.
Do not install the drain line in front of any access panel.
2.3 Air Ducts, Filters and Grilles
Rigid Ducting:
a. Use flexible connections between unit and rigid ducting.
b. Use appropriately sized insulated ducting with
consideration for noise transmission through the
ducting (refer Appendix II).
c. Option: If access to the unit's air filter is restricted,
then a return air grille with filter incorporated could be
installed.
d. Supply air grilles should be selected and installed to
avoid draughts and noise but give good air distribution.
003-000-145 11/20
