Emerson VERTIV Liebert Mini-Mate2 Series User Manual page 27

Humidifier Water Supply Line
Units supplied with the optional humidifier package have a 1/4 in. OD copper compression fitting
with ferrule at the water supply connection. Supply pressure range is 10 psig to 150 psig (69 to
1034kPag). Required flow rate is 1 gpm (3.8 lpm). A shutoff valve should be installed in this line to
isolate the humidifier for maintenance.
Assembly Instructions
1. Cut the tube square and remove any burrs.
2. Slide nut then sleeve on tube; threaded end of nut faces end of tube.
3. Insert the tube into the fitting, seating it against the stop shoulder and tighten the nut hand-tight
to the body.
4. Use a wrench to tighten the nut 1-1/4 to 2-1/4 turns.
NOTICE
Risk of improper tightening of the piping fittings. Can damage fittings and cause leaks.
Use caution not to overtighten or undertighten the piping fittings.
Chilled Water Loop
On chilled water units, install manual service shutoff valves at the supply and return lines of each
unit. These shutoff valves are used for routine service and for emergency isolation of the unit.
Chilled water supply and return lines must be insulated to prevent condensation of the water supply
and return lines.
The minimum recommended water temperature is 42°F (5.5°C). Design pressure is 300 psig
(2068kPa). Supply and return connection sizes are 5/8" (15.9mm) OD copper.
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
damage and building.
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 HVAC glycol solution only that has been prepared by industry practices.
Regulating Valve
Water/glycol-cooled units include a coolant flow regulating valve that is factory-adjusted and should
not need field adjustment.
Standard-pressure and high-pressure valves are adjusted differently. Contact Liebert Precision
Cooling Support before making any adjustments.
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Liebert Mini-Mate2 20
Site Preparation and Installation