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12
APPLICABLE OUTDOOR UNIT CONTROL
FUNCTIONS
You can use the following functions by attaching the "Application control kit" (TCB-PCOS1E2) sold
separately.
Demand control function
• Cooling/heating capacity of the outdoor unit is saved by receiving/converting external demand signals, according to
temporary peak-cut conditions.
• Capacity savings can be adjusted to three steps: 75%, 50%, and operation stop.
Night operation control (Sound reduction) function
In order to reduce noise levels at night, if incorporating this control with a commercially available timer, the outdoor
operating sound level will be reduced by approx. 5 dB during cooling operation.
Compressor operation output function
Checks the compressor operation time for maintenance etc.
13
ANNUAL MAINTENANCE
• For an air conditioning system that is operated on a regular basis, cleaning and maintenance of the indoor/outdoor
units are strongly recommended.
As a general rule, if an indoor unit is operated for about 8 hours daily, the indoor/outdoor units will need to be
cleaned at least once every 3 months. This cleaning and maintenance should be carried out by a qualified service
person.
Failure to clean the indoor/outdoor units regularly will result in poor performance, icing, water leaking and even
compressor failure.
EN-93
- 47 -
14
APPENDIX
Work instructions:
The existing R22 and R407C piping can be reused for
our digital inverter R410A product installations.
NOTE
Confirming the existence of scratches or dents on the
existing pipes and confirming the reliability of the pipe
strength are conventionally referred to the local site.
If the specified conditions can be cleared, it is
possible to update existing R22 and R407C pipes to
those for R410A models.
Basic conditions needed to reuse existing
pipes
Check and observe the presence of three conditions in
the refrigerant piping works.
1.
Dry (There is no moisture inside of the pipes.)
2.
Clean (There is no dust inside of the pipes.)
3.
Tight (There are no refrigerant leaks.)
Restrictions for use of existing pipes
In the following cases, the existing pipes should not
be reused as they are. Clean the existing pipes or
exchange them with new pipes.
1.
When a scratch or dent is heavy, be sure to use new
pipes for the refrigerant piping works.
2.
When the existing pipe thickness is thinner than the
specified "Pipe diameter and thickness," be sure to
use new pipes for the refrigerant piping works.
• The operating pressure of R410A is high (1.6
times that of R22 and R407C). If there is a
scratch or dent on the pipe or a thinner pipe is
used, the pressure strength may be inadequate,
which may cause the pipe to break in the worst
case.
* Pipe diameter and thickness (mm)
Pipe outer diameter Ø6.4 Ø9.5 Ø12.7 Ø15.9 Ø19.0
R410A
Thickness
0.8
0.8
0.8
1.0
R22
(R407C)
• In case the pipe diameter is Ø12.7 mm or less and the
thickness is less than 0.7 mm, be sure to use new
pipes for the refrigerant piping works.
3.
When the outdoor unit was left with the pipes
disconnected, or the gas leaked from the pipes and
the pipes were not repaired and refilled.
• There is the possibility of rain water or air,
including moisture, entering the pipe.
4.
When refrigerant cannot be recovered using a
refrigerant recovery unit.
• There is the possibility that a large quantity of dirty
oil or moisture remains inside the pipes.
5.
When a commercially available dryer is attached to
the existing pipes.
• There is the possibility that copper green rust has
been generated.
6.
When the existing air conditioner is removed after
refrigerant has been recovered.
Check if the oil is judged to be clearly different from
normal oil.
• The refrigerator oil is copper rust green in color:
There is the possibility that moisture has mixed
with the oil and rust has been generated inside
the pipe.
• There is discolored oil, a large quantity of residue,
or a bad smell.
• A large quantity of shiny metal dust or other wear
residue can be seen in the refrigerant oil.
7.
When the air conditioner has a history of the
compressor failing and being replaced.
• When discolored oil, a large quantity of residue,
shiny metal dust, or other wear residue or mixture
of foreign matter is observed, trouble will occur.
EN-94
1.0
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