York VCH-25A, Installation Manual

Page: 32 / 58

Use an electric cord resistor in the drain trap as well as in the drain, where applicable.
In heat pumps, also use cord resistors in the outdoor coil tray to prevent any ice from accumulating.
Special instruction for locations with high ambient temperatures
In areas where the ambient temperature is over 43 °C, the unit must not be located in direct sunlight and,
therefore a specific cover will be required.
The installation of a special sunshade over the unit must not affect the air flow required by the unit to
work correctly. See section
Clearances , see on page 14.
1.10.2 Fixture of the indoor unit to the ceiling
C A U T I O N
Make sure the ceiling is strong enough to withstand the weight of the unit.
Before hanging the unit, test the firmness of each suspension bolt installed.
The unit must be attached to the ceiling using the indoor unit supports and the suspension bolts installed.
On attaching it, it must be completely horizontal, leaning slightly towards the drain to avoid any drops of
condensation (use a spirit level for levelling).
1.10.3 Air ducts
Characteristics of the facility where the unit will be installed
Air duct installation
The air duct installation where the unit is to be installed must be formed by a closed return duct system.
The additional installation of economisers or outdoor air intakes is not excluded.
To reduce operating noise, the supply and return air duct connections on the unit must be made using
flexible joints.
The supply and return air duct systems must be designed for the air flow requirements of the installation.
The ducts should not be sized based on the supply and return air connection sizes of the unit.
Hatches should be installed on each discharge duct bypass and where access is planned for cleaning
and replacement of filters.
Outdoor unit air ducts
1. Connect the ducts, isolating them from the appliance using a flexible sleeve preferably made of non-
combustible material in order to prevent vibrations from being transmitted from the appliance. Ducts
made of flexible materials do not transmit vibrations.
2. In VCH 45A, 60A, 75A and 90A units, two independent ducts must be installed, one for each fan up
to discharge, to avoid air recirculation.
3. If the outdoor coil air is released through conducts, the first one-metre section should be made of
galvanised plate to prevent damage from drops of water being dragged along.
Indoor unit air ducts
1. Connect the ducts, isolating them from the appliance using a flexible sleeve preferably made of non-
combustible material in order to prevent vibrations from being transmitted from the appliance. Ducts
made of flexible materials do not transmit vibrations.
2. A hatch must be located on each discharge duct bypass for correct system balancing.
3. Easy access should be established for cleaning and replacement of the air filters.
Installation manual 1
Instructions for installation and connection of the unit 1.10
29