Technical data

Guide Specifications for Liebert Mini-Mate2- 5-Ton Systems
42 Liebert
®
Mini-Mate2
™
2.4.4 SCR Electric Reheat
The electric reheat shall be low-watt density, 304/304 stainless steel, finned-tubular and shall be
capable of maintaining room dry bulb conditions when the system is calling for dehumidification. The
reheat section shall include an agency-approved safety switch to protect the system from overheating.
The SCR (Silicon Controlled Rectifier) controller shall proportionally control the reheat elements to
maintain the selected room temperature. The rapid cycling made possible by the SCR controller
provides precise temperature control, and the more constant element temperature improves heater
life. The unit microprocessor control shall operate the SCR controller, while cooling is locked on. The
capacity of the reheat coils shall be ______ BTU/HR (kW), with unit input voltage of ______V. Not
available on chilled water or free-cooling units.
2.4.5 Disconnect Switch, Non-Locking
The non-automatic, non-locking, molded case circuit breaker shall be factory-mounted in the high-
voltage section of the electrical panel. The switch handle shall be accessible from the front of the
indoor unit.
2.4.6 High-Temperature Sensor
The high temperature sensor shall immediately shut down the system when high temperatures are
detected. The high temperature sensor shall be mounted with the sensing element in the return air.
2.4.7 Smoke Sensor
The smoke sensor shall immediately shut down the environmental control system and activate the
alarm system when activated. The sensing element shall sense the return air conditions. This smoke
sensor shall not function or replace any room smoke detector that may be required by local or national
codes.
2.4.8 Filter Clog Switch
The filter clog switch senses pressure drop across the filters and shall annunciate the wall-box display
upon reaching the adjustable setpoint.
2.4.9 Free-Cooling/Dual Cooling Coil
A free-cooling coil shall be integral to the evaporator cabinet, and shall be constructed of copper tubes
and aluminum fins. The coil shall be rated at ______ BTU/HR (kW) sensible cooling capacity with a
45°F (22°C), ___% glycol solution. The coil shall require ______ GPM (l/s) and the total unit pressure
drop shall not exceed ______ feet of water (kPa) when in the free-cooling mode. Free-cooling shall be
activated by a temperature stat and shall include factory-piped three-way valve and separate supply
and return piping.
Coil is designed for closed-loop applications using properly treated and circulated fluid. Not available
with SCR reheat.
An optional Cu-Ni coil is required to prevent premature corrosion if applied to open water tower loop.
A heat exchanger and pump shall be field-supplied to isolate the open water tower loop from the
free-cooling loop.
2.5 Ship-Loose Accessories
2.5.1 Remote Sensors
The unit shall be supplied with remote temperature and humidity sensors. The sensors shall be
connected to the unit by a ______ ft. (m) shielded cable.
2.5.2 Air Filter Box/Duct Flange
The evaporator section shall be supplied with an air filter box for use with ducted installations.
Two (2) filters shall be included 4" x 20" x 20" (102 mm x 508mm x 508mm) each, pleated type, with a
MERV 8 rating, based on ASHRAE 52.2-2007. A duct flange shall be supplied for use on the supply
air opening of the unit.
2.5.3 Condensate Pump
The condensate pump shall have the capacity of ___ GPH (___ l/h) at ___ ft. head (___ kPa). It shall be
complete with integral float switch, pump, motor assembly, discharge check valve, duct/wall
mountable bracket and reservoir. A secondary float switch shall be provided to permit field wiring to
the unit control to shut down the evaporator upon a high water level condition.