Daikin LREQ5B7Y1 Operation Manual page 8

10-2-2 Selection, installation, work failures specified
below and other failures
Note: Asterisk-marked items show concrete examples.
1. Model selection failures
•
A model not suitable for storage applications is selected.
* The cooling of products not reaching the target storage
temperatures.
•
Cooling overloading or underloading judged by our dealer.
* The frequency of stoppage is 6 or more times per hour or the
set cooling temperature is not attained.
2. Installation failure (installation and environmental problems)
•
The unit is not installed on a stable horizontal plane.
* The unit is not fixed securely.
•
The environmental conditions of the place of installation differ
from normal atmospheric conditions.
* Briny air environment, shore side, oil mist environment,
kitchen exhaust side, other corrosive gas and adhesive mist
environment.
•
The place of installation had poor ventilation and heat
dissipation.
* The machine took in exhausted air again.
3. Work failure
•
The interior of the piping was not vacuum dried sufficiently.
* The clogging of the thin areas of the piping caused by icing.
•
The interior of the piping was not sufficiently airtight.
* Leakage of refrigerant gas.
•
The interior of the piping was contaminated with foreign
substance.
* The clogging of the thin areas of the piping.
•
The unit was adversely affected by on-site modification work.
* The use of the unit beyond the operating temperature range as a
result of on-site modification.
•
An accident resulted from the improper handling of the unit
under installation work.
* The loosening or wobbling of the outer panel or broken or bent
damage to the piping.
4. Operational failure
•
Temperature settings for stored objects were wrong.
* The storage of vegetables at temperatures below 0°C.
•
The periodical maintenance of the unit was neglected.
* The clogging of the air heat exchanger, rust generation from
each part, gas leakage, and icing of the indoor unit (showcase
and unit cooler).
5. Others
•
Improvements recommended by our dealer in advance were
not accomplished.
* The simultaneous starting and stopping of a number of units.
•
Accidents were caused by natural disaster or fire.
* Damage to electrical parts caused by lightning.
•
There were other installation and operational problems beyond
common sense.
* The use of the unit without heat insulation work on the piping.
•
Work was conducted without keeping the following showcase
restrictions.
<Showcase restrictions>
· The installation of the thermostatic expansion valve and
liquid supply solenoid valve (both of which are for R410A) on
a showcase basis.
Thermal insulation of feeler tube of thermostatic expansion
valve must be thermal insulated.
· Install showcases on the same floor if the showcases are
connected to a single outdoor unit.
· Make sure that the outlet of piping used for the heat
exchanger is located downward (as shown on the following
figure).
Heat exchanger
Operation manual
7
Inlet
(upper side)
Outlet
(lower side)
11.
LREQ5~20B7Y1
Air cooled refrigeration condensing unit
4PW74303-1C – 2016.02