5 Preparation
Installer reference guide
8
RZQG7 RZQG71~12 RZQG140L7Y1L
Split system air conditioners
4P473074-1A – 2019.04
Install the outdoor unit away from direct sea winds.
Example:
Behind the building.
b
c
a
If the outdoor unit is exposed to direct sea winds, install a
windbreaker.
▪ Height of windbreaker≥1.5×height of outdoor unit
▪ Mind the service space requirements when installing the
windbreaker.
a
b
c
d
c
d
a
Sea wind
b
Building
c
Outdoor unit
d
Windbreaker
Strong winds (≥18 km/h) blowing against the outdoor unit’s air outlet
causes short circuit (suction of discharge air). This may result in:
▪ deterioration of the operational capacity;
▪ frequent frost acceleration in heating operation;
▪ disruption of operation due to decrease of low pressure or
increase of high pressure;
▪ a broken fan (if a strong wind blows continuously on the fan, it
may start rotating very fast, until it breaks).
It is recommended to install a baffle plate when the air outlet is
exposed to wind.
It is recommended to install the outdoor unit with the air inlet facing
the wall and NOT directly exposed to the wind.
a
b
c
b
a
Baffle plate
b
Prevailing wind direction
c
Air outlet
The outdoor unit is designed for outdoor installation only, and for
ambient temperatures ranging:
Model
Cooling
Heating
RZQG
–15~50°C
–20~15.5°C
5.2.2
Additional installation site requirements
of the outdoor unit in cold climates
Protect the outdoor unit against direct snowfall and take care that the
outdoor unit is NEVER snowed up.
a
b
c
c
d
a
Snow cover or shed
b
Pedestal (minimum height=150 mm)
c
Prevailing wind direction
d
Air outlet
5.3
Preparing refrigerant piping
5.3.1
About reusing existing piping
In some cases you can reuse existing piping, in other cases not.
Reuse not allowed
You CANNOT reuse existing piping in the following cases:
▪ When the compressor in the old installation had problems
(example: breakdown).
Possible consequence:
oxidised coolant
oil, scale residue and other adverse effects.
▪ When the indoor and outdoor units were disconnected from the
piping for a long time.
Possible consequence:
water and dirt in
the piping.
▪ When the copper piping is corroded.
Reuse allowed
In other cases than above, you can reuse existing piping but keep
the following in mind:
Item
Description
Piping diameter
Must comply with requirements. See
"5.3.2 Refrigerant piping requirements" on
page 9
Piping material
Piping length and
height difference
Piping insulation
If deteriorated, must be replaced.
Must comply with requirements. See