Site Preparation and Installation
Liebert
®
Mini-Mate2
™
20
Water/Glycol Loop
Emerson recommends installing manual service shutoff valves at the supply and return line to each
unit. This permits routine service and emergency isolation of the unit. Install 1/2" (13mm) diameter
condensing fluid inlet and 1/2" (13mm) diameter condensing fluid outlet.
When the condensing fluid quality is poor, Emerson recommends placing proper filters in the supply
line to extend the service life of the condenser. These filters must be easily replaced or cleaned. The
standard maximum fluid pressure is 150 psig (1034 kPa) or optional 350 psig (2413 kPa) systems. For
applications above this pressure, consult the factory.
The water/glycol-cooled system will operate in conjunction with a cooling tower, city water or
drycooler.
NOTICE
Risk of frozen pipes and corrosion from improper coolant mixture. Can cause equipment and
building damage.
When piping or the Liebert Mini-Mate2 may be exposed to freezing temperatures, charge the
system with the proper percentage of glycol and water for the coldest design ambient.
Automotive antifreeze is unacceptable and must NOT be used in any glycol fluid system. Use
only an HVAC glycol solution only that has been prepared according to industry practices.
Refrigerant (R-407C) Loop
All split systems require two refrigerant lines (an insulated copper suction line and a copper liquid
line) between the evaporator and the condensing unit.
The refrigerant lines can be piped by installing:
• an optional sweat adapter kit and hard piping between the two units
• optional pre-charged line sets (maximum combined length of 45' [13.7m])
• close coupling the units together using the quick connects. (See
Figure 17
)
All refrigeration piping should be installed with high-temperature brazed joints. Prevailing good
refrigeration practices should be employed for piping supports, leak testing, evacuation, dehydration
and charging of the refrigeration circuits. The refrigeration piping should be isolated from the
building with vibration-isolating supports. To prevent tube damage when sealing openings in walls
and to reduce vibration transmission, use a soft, flexible material to pack around the tubes.
NOTICE
Risk of twisted or kinked piping. Can cause flow restriction or leaks.
Handle the pre-charged lines with care so they do not get kinked or damaged. Use tube
benders and make all bends before making connections to either end. Coil any excess tubing
in a horizontal plane with the slope of the tubing toward the condensing unit.
!
WARNING
Risk of explosive discharge from high-pressure refrigerant. Can cause injury or death.
This unit contains fluids and gases under high pressure. Relieve pressure before working with
piping.
