Technical data

Guide Specifications for Liebert Mini-Mate2—1- and 1.5-Ton Systems
39 Liebert
®
Mini-Mate2
™
2.2 Direct Expansion Split System Components
2.2.1 Evaporator Unit
The evaporator section shall include evaporator coil, thermostatic expansion valve and filter drier.
The evaporator coil shall have 2.4 sq.ft. (0.23 sq.m) face area, __ rows deep. It shall be constructed of
copper tubes and aluminum fins and have a maximum face velocity of ___ ft. per minute (____ m/s) at
___ CFM ( ____ CMH). An externally equalized thermostatic expansion valve shall control refrigerant
flow. The evaporator coil shall be factory-charged with R-407C refrigerant and sealed.The coil shall be
provided with a condensate drain pan, with an internally trapped drain line. The evaporator drain
pan shall include a factory-installed float switch to shut down the evaporator upon high water
condition.
2.2.2 Outdoor Air-Cooled Prop Fan Condensing Unit
Condensing unit components shall include a condenser coil, a direct-drive propeller-type fan, a (scroll)
(reciprocating) compressor with vibration-isolating grommets, high pressure switch, Liebert
Lee-Temp
™
receiver and head pressure control valve, hot gas bypass system and liquid line solenoid
valve. The condenser coil shall be constructed of copper tubes and aluminum fins.
A hot gas bypass system shall be provided to reduce compressor cycling and improve operation under
low load conditions.
All components shall be factory-assembled, charged with R-407C refrigerant, sealed and be capable of
being connected to the evaporator section using pre-charged refrigerant line sets. No internal piping,
brazing, dehydration or charging shall be required. Condensing unit shall be designed for 95°F (35°C)
ambient and be capable of operation to -30°F (-34.4°C).
(Option) The coils shall be phenolic-coated for extended coil life in coastal areas.
2.3 Factory-Installed Options/All Cooling Units
2.3.1 Steam Generating Humidifier
The environmental control system shall be equipped with a steam generating humidifier that is
controlled by the microprocessor control system. It shall be complete with disposable canister, all
supply and drain valves, 1" (25.4mm) air gap on fill line, inlet strainer, steam distributor and
electronic controls. The need to change canister shall be annunciated on the microprocessor wall box
control panel. The humidifier shall have a capacity of 2.5 lb/hr (1.1 kg/h). An LED light on the
humidifier assembly shall indicate cylinder full, overcurrent detection, fill system fault and end of
cylinder life conditions.
2.3.2 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 a UL-approved safety switch to protect the system from overheating. The capacity of
the reheat coils shall be ______ Btu/hr (kW), with input power of ______ V, controlled in one stage.
2.3.3 Hot Water Reheat
The hot water reheat coil shall have copper tubes and aluminum fins with a capacity of ______ Btu/hr
(kW) when supplied with ______°F (°C) entering water temperature at _______ GPM (l/s) flow rate.
Maximum pressure drop shall be ______ PSI (kPa). The control system shall be factory pre-piped with
a two-way solenoid valve and cleanable Y-strainer. The hot water reheat coil shall only be available
on chilled water units.
2.3.4 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 a UL-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 input power of ______ V. Not available on
chilled water or free-cooling units.