Roof Top Units
HA / 34 /45 /52 /61 / 75 / 89 / 110 RC
Roof Top Unit
7
LOCATING THE UNIT
This series of packaged air conditioning units is designed for outdoor, rooftop or ground level installation.
The unit must be installed on a firm level foundation, of adequate strength to support its full operating weight. Some
form of vibration isolation such as rubber waffle pads should be installed between the unit and the supporting
structure.
1- The unit must not be located where it will be subjected to heavy downpour of roof drainage and must be above
ground level in areas that are prone to storm water flooding.
2- It must be high enough to permit good drainage of defrost water and allow any heavy ice to fall away form the
coil during defrost cycle.
Minimum recommend height is 250mm above ground level.
3- Keep exposed duct connections to a minimum to reduce duct losses.
4- When locating unit give consideration to, and locate unit as remote as possible from neighbours sleeping
areas to minimise noise, as heat pump loads are greatest at night time.
5- Where prevailing winter winds are known, if possible, position the outdoor coil away from the winds to reduce
defrost cycle time.
6- If possible, orient the unit outdoor coil towards the morning sun. This increases efficiency in heating and de-
creases the solar load on the unit in the summer cooling cycle.
7- The unit must be pitched slightly towards the indoor condensate drain outlet to provide positive drainage of
condensates.
8- All electrical and ductwork connections to the unit must be made via flexible connections to prevent transmis-
sion of vibration.
9- Service and air flow clearances must be allowed as indicated on the unit dimension sheet. If should be noted
that major service may require removal of the top panels. Particular attention should be paid to avoiding ob-
structions to the vertical condenser air discharge which may result in recirculation of the outdoor air.
10- In addition to the service clearances noted on the dimension sheet it is essential that provision is made for
adequate and safe service access.
11- The standard outdoor fans fitted to the units will not accept any resistance to air flow. Consequently, should it
be necessary to duct outdoor air to or from the unit, the ductwork system (including entering and leaving
weatherproof louvres if fitted) must be of negligible pressure loss.
