Technical data

Guide Specifications for Liebert Mini-Mate2—1- and 1.5-Ton Systems
Liebert
®
Mini-Mate2
™
38
2.2 Direct Expansion Self-Contained System Components
2.2.1 Refrigeration System
The refrigeration system shall consist of a (scroll) (rotary) compressor with vibration isolating
grommets, evaporator coil, condenser coil, externally equalized thermostatic expansion valve, high
pressure safety switch, filter drier, hot gas bypass circuit, factory R-407C refrigerant charge and
externally equalized expansion valve. Hot gas bypass shall be provided to reduce compressor cycling
and optimize performance under low load conditions.
2.2.2 Evaporator Coil
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). 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.
2.2.3 Air-Cooled Condenser Coil
The air-cooled condenser section shall contain a factory mounted and piped condenser coil constructed
of copper tubes and aluminum fins. No piping, brazing, dehydration or charging shall be required.
The condenser coil shall be factory mounted within the unit cabinet.
2.2.3.1 Air-Cooled Condenser Fan
A factory-supplied condenser fan shall be field-mounted to the end of the evaporator cabinet. The
system shall be provided with a fan speed control system to permit operation at -20°F (-28.9°C) inlet
ambient air temperature and sized to provide full rated cooling capacity at 95°F (35°C) entering air
from plenum space. The centrifugal condenser fan shall deliver ____CFM (____ CMH) at ____inches
(___mm) external static pressure at maximum speed.
Condenser fan electrical and refrigerant pressure connections shall be field attached to the cooling
chassis using factory provided wiring harness and capillary tube/fitting.
2.2.3 Water/Glycol-Cooled Condenser
The water/glycol-cooled condenser section shall contain a factory-mounted and piped coaxial
condenser constructed of steel and copper tubing. No piping, brazing, dehydration or charging of
refrigerant shall be required. The condenser coil shall be factory-mounted within the unit cabinet.
The total system pressure drop of the water/glycol system shall be______ ft. of water (kPa) and a flow
rate of ______ GPM (l/s) with ______ °F (°C) entering water/glycol temperature.
The condenser circuit shall be pre-piped with a [(2-way) (3-way)] regulating valve which is head-
pressure actuated.
The condenser water/glycol circuit shall be designed for a static operating pressure of [(150PSI
(1034kPa)) (350PSI (2413kPa))].