Nibe CLIMACOOL UCR 30, Installation, Operation & Maintenance Manual

59

www.climacoolcorp.com

Copper Tubing, Brazing and System 

Reprocessing Recommendations

Copper tubing must be refrigeration grade (ACR type 

“L”). Be sure to install appropriate copper fittings rated 

for ACR applications . Never leave refrigerant lines open 

when they are not directly being installed . Never rely on 

the last refrigerant connection joint at a specific section 

(UCR module or condenser section) to provide structural 

support for the interconnecting piping . Line pulsation may 

occur at start-up and shut down of scroll compressors . 

Additional line support may be required to prevent vibration 

transmission or movement in the line . Ensure that all 

interconnecting piping is properly and independently braced 

at 7 feet minimum intervals, and within 2 feet from each 

section’s final connection location, to prevent joint fracture 

due to line vibrations or liquid hammering .

Use 15% silver-phosphorus braze filler rod when brazing 

copper-to-copper joints . When brazing copper-to-brass 

joints, apply “sta-silv” brazing paste (or equivalent) 

sparingly to the joint areas, and use 45% silver-phosphorus 

braze filler rod. Always purge a generous flow of dry 

nitrogen (approximately 10 CFH) through the lines while 

brazing to prevent internal scaling of copper oxide on 

heated copper surfaces exposed to air .

When sizing the interconnecting refrigerant lines, never 

use the stub-out sizes at the UCR module section as the 

determining factor . For proper operation, all discharge 

and liquid lines must be sized in accordance with the 

recommendations provided in the following piping sections . 

After installing the interconnecting piping, proper system 

evacuation and reprocessing guidelines are provided in 

the Refrigeration System Reprocessing section of the Split 

System Interconnecting Piping on page 60 .

Liquid Line Piping Recommendations 

All liquid lines should be kept as short as possible, and the 

line sizing is determined to provide for a low-pressure drop 

to prevent liquid line flashing. There should always be a 

gradual negative elevation change when traversing from 

the remote condenser location to the UCR module section . 

Avoid any reversing elevation changes throughout this liquid 

line run . Horizontal liquid lines should be sloped downward 

in the direction of refrigerant flow at a pitch of 1/8” per foot. 

The total equivalent distance between the condenser and 

the UCR section (including allowances for U-bends and 90° 

elbows) should not exceed 100 feet . Avoid  routing liquid lines 

through heated spaces which may result in undesirable flash 

gas generated at the TXV inlet . Avoid insulating liquid lines .

Conforming to local and national codes is the responsibility 

of the service technician or installing contractor . The service 

technician should be familiar with the following codes:

• 

ASHRAE Standard Safety Code for Mechanical 

Refrigeration, ANSI/ASHRAE 15-1978

• 

American National Standard Code for Pressure Piping, 

ANSI B31 .5-1974

Factory Tested  

ClimaCool modular chillers have been pressure-tested, 

evacuated and both refrigeration circuits pressurized 

with 50 psig of dry nitrogen prior to shipment . The split 

system chillers require interconnecting refrigeration piping 

between the ClimaCool UCR modular remote air cooled 

chiller and the remote condenser section . The condenser 

section provided by ClimaCool is typically a remote air-

cooled condenser configuration. Contact the factory for 

guidelines for customer supplied, field integration to other 

permissible condenser types, such as evaporative condenser 

configurations. The refrigerant charge will be weighed-

in in the field based on the condenser configuration and 

condenser model . The ClimaCool UCR030 model is equipped 

with a 72 pound liquid receiver capacity per compressor 

circuit . The UCR050 and UCR070 models have an 84 pound 

liquid receiver installed per circuit . All ClimaCool UCR models 

MUST be charged with R-410A refrigerant . Field installation 

of additional receiver capacity may be required depending 

on the refrigerant retaining volume of the remote 

condenser and interconnecting piping . After the total 

refrigerant amount is charged into each circuit (weighed 

in using an appropriate refrigeration scale), the resulting 

weight should be recorded on the UCR module data plate 

for future reference . See Refrigerant Charging Procedure 

on pages 61 - 62 for specific charging guidelines. Also 

refer to the job specific submittal data for the appropriate 

refrigerant charge amount .

UCR Modular Chiller Refrigeration  

Piping Connections

The discharge and liquid line stub-out connections at the 

UCR module section are equipped with shut-off valves with 

capped leads . Never uncap these leads without checking 

the shutoff valves to be sure that they are fully closed and 

the units are ready for piping . All scroll compressors in 

ClimaCool UCR modules are equipped with POE refrigeration 

oil . Systems with compressors using POE oils must be kept 

closed at all times except when the interconnecting piping is 

being directly installed . POE oils are extremely hygroscopic 

in nature and will absorb an undesirable amount of moisture 

from normal ambient air within a few minutes .

Refrigeration System Re-Processing