For Effectively Using The Refrigeration Unit - Panasonic OCU-CR400VF8 Operating Instructions And Installation Instructions

For Effectively Using the Refrigeration Unit

Cautions for Installation Work
This refrigeration unit has been designed exclusively for R744 (CO
Refrigeration oil and each component including the compressor have been exclusively designed for the refrigeration
unit.
Please use sufficient caution for maintaining the reliability of the product.
(1) Since CO refrigerant becomes high pressure during the operation, use the piping material and other
2
components particularly designed for CO
(2) As the refrigeration oil absorbs moisture, opening time should be as short as possible. Connection of the
piping to the refrigeration unit should be made at the last stage of piping installation work. Avoid outdoor
work on a rainy day.
(3) For piping work, use "phosphorous-deoxidized copper pipe" of refrigeration grade, clean, dehydrated and
"phosphor-copper brazing solder".
If "silver brazing solder" is to be used, do not use any flux containing chlorine. During pipe brazing it is a must to
use nitrogen over pressure.
(4) Do not use pipe joints made for HFC refrigerant, because they do not have the required strength. In addition,
absolutely do not use flared joints.
(5) For the purpose of protecting the refrigeration unit and refrigeration cycle, be sure to install the included filter dryer
at the liquid line of the refrigeration unit.
(6) Gas leak detector used for airtight test should be foaming liquid or soap water. Do not use kitchen detergent.
Kitchen detergent may corrode metals.
For Economically Using the Refrigeration Unit
For the purpose of using the refrigeration unit economically, consider the followings.
Cooling capacity largely varies by the method of use.
When evaporating temperature falls by 1K, cooling capacity decreases by 3 to 4%, and increase of discharge pressure
decreases cooling capacity and increases power consumption.
In order to fully extract the unit performance, compressor suction pressure should be increased as high as possible,
and discharge pressure should be made as low as possible. For this reason, caution should be used in the following
points.
(1) Make the piping resistance as small as possible.
Ref: Capacity change rate per 1 °C pressure loss of suction line
Evaporating temperature
-20 °C to -5 °C
(2) Select an evaporator of sufficient capacity for raising evaporating temperature as high as possible.
(3) Do not block the cold air outlet in a refrigerator or showcase with food items.
(4) Operate door opening of a refrigerator as quickly as possible. (To avoid leak of cold air, reduce the time of door
opening)
(5) The gas cooler should be cleaned periodically to avoid clogging.
2
refrigerant with sufficient strength.
2
Capacity change rate per 1 °C
3 % to 4 %
EN - 12
refrigerant).